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1.
Biol Cybern ; 117(3): 163-183, 2023 06.
Artigo em Inglês | MEDLINE | ID: mdl-37060453

RESUMO

The classical Hodgkin-Huxley (HH) point-neuron model of action potential generation is four-dimensional. It consists of four ordinary differential equations describing the dynamics of the membrane potential and three gating variables associated to a transient sodium and a delayed-rectifier potassium ionic currents. Conductance-based models of HH type are higher-dimensional extensions of the classical HH model. They include a number of supplementary state variables associated with other ionic current types, and are able to describe additional phenomena such as subthreshold oscillations, mixed-mode oscillations (subthreshold oscillations interspersed with spikes), clustering and bursting. In this manuscript we discuss biophysically plausible and phenomenological reduced models that preserve the biophysical and/or dynamic description of models of HH type and the ability to produce complex phenomena, but the number of effective dimensions (state variables) is lower. We describe several representative models. We also describe systematic and heuristic methods of deriving reduced models from models of HH type.


Assuntos
Modelos Neurológicos , Neurônios , Neurônios/fisiologia , Potenciais de Ação/fisiologia , Potenciais da Membrana/fisiologia , Biofísica
2.
Nat Commun ; 12(1): 6956, 2021 11 29.
Artigo em Inglês | MEDLINE | ID: mdl-34845192

RESUMO

Latrotoxins (LaTXs) are presynaptic pore-forming neurotoxins found in the venom of Latrodectus spiders. The venom contains a toxic cocktail of seven LaTXs, with one of them targeting vertebrates (α-latrotoxin (α-LTX)), five specialized on insects (α, ß, γ, δ, ε- latroinsectotoxins (LITs), and one on crustaceans (α-latrocrustatoxin (α-LCT)). LaTXs bind to specific receptors on the surface of neuronal cells, inducing the release of neurotransmitters either by directly stimulating exocytosis or by forming Ca2+-conductive tetrameric pores in the membrane. Despite extensive studies in the past decades, a high-resolution structure of a LaTX is not yet available and the precise mechanism of LaTX action remains unclear. Here, we report cryoEM structures of the α-LCT monomer and the δ-LIT dimer. The structures reveal that LaTXs are organized in four domains. A C-terminal domain of ankyrin-like repeats shields a central membrane insertion domain of six parallel α-helices. Both domains are flexibly linked via an N-terminal α-helical domain and a small ß-sheet domain. A comparison between the structures suggests that oligomerization involves major conformational changes in LaTXs with longer C-terminal domains. Based on our data we propose a cyclic mechanism of oligomerization, taking place prior membrane insertion. Both recombinant α-LCT and δ-LIT form channels in artificial membrane bilayers, that are stabilized by Ca2+ ions and allow calcium flux at negative membrane potentials. Our comparative analysis between α-LCT and δ-LIT provides first crucial insights towards understanding the molecular mechanism of the LaTX family.


Assuntos
Viúva Negra/química , Cálcio/química , Neurotoxinas/química , Fosfatidilcolinas/química , Fosfatidiletanolaminas/química , Venenos de Aranha/química , Animais , Sítios de Ligação , Viúva Negra/patogenicidade , Cálcio/metabolismo , Clonagem Molecular , Microscopia Crioeletrônica , Escherichia coli/genética , Escherichia coli/metabolismo , Expressão Gênica , Vetores Genéticos/química , Vetores Genéticos/metabolismo , Transporte de Íons , Bicamadas Lipídicas/química , Bicamadas Lipídicas/metabolismo , Potenciais da Membrana/fisiologia , Modelos Moleculares , Neurotoxinas/genética , Neurotoxinas/metabolismo , Fosfatidilcolinas/metabolismo , Fosfatidiletanolaminas/metabolismo , Ligação Proteica , Conformação Proteica em alfa-Hélice , Conformação Proteica em Folha beta , Domínios e Motivos de Interação entre Proteínas , Multimerização Proteica , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Venenos de Aranha/genética , Venenos de Aranha/metabolismo
3.
Cell Physiol Biochem ; 55(S3): 46-64, 2021 Mar 06.
Artigo em Inglês | MEDLINE | ID: mdl-33667331

RESUMO

BACKGROUND/AIMS: Tea, produced from the evergreen Camellia sinensis, has reported therapeutic properties against multiple pathologies, including hypertension. Although some studies validate the health benefits of tea, few have investigated the molecular mechanisms of action. The KCNQ5 voltage-gated potassium channel contributes to vascular smooth muscle tone and neuronal M-current regulation. METHODS: We applied electrophysiology, myography, mass spectrometry and in silico docking to determine effects and their underlying molecular mechanisms of tea and its components on KCNQ channels and arterial tone. RESULTS: A 1% green tea extract (GTE) hyperpolarized cells by augmenting KCNQ5 activity >20-fold at resting potential; similar effects of black tea were inhibited by milk. In contrast, GTE had lesser effects on KCNQ2/Q3 and inhibited KCNQ1/E1. Tea polyphenols epicatechin gallate (ECG) and epigallocatechin-3-gallate (EGCG), but not epicatechin or epigallocatechin, isoform-selectively hyperpolarized KCNQ5 activation voltage dependence. In silico docking and mutagenesis revealed that activation by ECG requires KCNQ5-R212, at the voltage sensor foot. Strikingly, ECG and EGCG but not epicatechin KCNQ-dependently relaxed rat mesenteric arteries. CONCLUSION: KCNQ5 activation contributes to vasodilation by tea; ECG and EGCG are candidates for future anti-hypertensive drug development.


Assuntos
Catequina/análogos & derivados , Canais de Potássio KCNQ/química , Canal de Potássio KCNQ1/química , Artérias Mesentéricas/efeitos dos fármacos , Extratos Vegetais/farmacologia , Chá/química , Animais , Sítios de Ligação , Catequina/química , Catequina/farmacologia , Canais de Potássio KCNQ/agonistas , Canais de Potássio KCNQ/genética , Canais de Potássio KCNQ/metabolismo , Canal de Potássio KCNQ1/antagonistas & inibidores , Canal de Potássio KCNQ1/genética , Canal de Potássio KCNQ1/metabolismo , Masculino , Potenciais da Membrana/efeitos dos fármacos , Potenciais da Membrana/fisiologia , Artérias Mesentéricas/fisiologia , Leite/química , Simulação de Acoplamento Molecular , Miografia , Oócitos/citologia , Oócitos/efeitos dos fármacos , Oócitos/metabolismo , Técnicas de Patch-Clamp , Extratos Vegetais/química , Ligação Proteica , Conformação Proteica em alfa-Hélice , Conformação Proteica em Folha beta , Isoformas de Proteínas/química , Isoformas de Proteínas/genética , Isoformas de Proteínas/metabolismo , Ratos , Ratos Wistar , Técnicas de Cultura de Tecidos , Vasodilatação/efeitos dos fármacos , Vasodilatação/fisiologia , Xenopus laevis
4.
Invest Ophthalmol Vis Sci ; 61(2): 4, 2020 02 07.
Artigo em Inglês | MEDLINE | ID: mdl-32031576

RESUMO

Purpose: Oxidative stress affects the retinal pigment epithelium (RPE) leading to development of vascular eye diseases. Cholecalciferol (VIT-D) is a known modulator of oxidative stress and angiogenesis. This in vitro study was carried out to evaluate the protective role of VIT-D on RPE cells incubated under hyperoxic conditions. Methods: Cadaver primary RPE (PRPE) cells were cultured in hyperoxia (40% O2) with or without VIT-D (α-1, 25(OH) 2D3). The functional and physiological effects of PRPE cells with VIT-D treatment were analyzed using molecular and biochemical tools. Results: Vascular signaling modulators, such as vascular endothelial growth factor (VEGF) and Notch, were reduced in hyperoxic conditions but significantly upregulated in the presence of VIT-D. Additionally, PRPE conditioned medium with VIT-D induced the tubulogenesis in primary human umbilical vein endothelial cells (HUVEC) cells. VIT-D supplementation restored phagocytosis and transmembrane potential in PRPE cells cultured under hyperoxia. Conclusions: VIT-D protects RPE cells and promotes angiogenesis under hyperoxic insult. These findings may give impetus to the potential of VIT-D as a therapeutic agent in hyperoxia induced retinal vascular diseases.


Assuntos
Colecalciferol/farmacologia , Hiperóxia/fisiopatologia , Epitélio Pigmentado da Retina/efeitos dos fármacos , Vitaminas/farmacologia , Adolescente , Adulto , Cadáver , Células Cultivadas , Criança , Pré-Escolar , Células Endoteliais da Veia Umbilical Humana , Humanos , Potenciais da Membrana/fisiologia , Pessoa de Meia-Idade , Estresse Oxidativo/fisiologia , Fagocitose/efeitos dos fármacos , Fagocitose/fisiologia , Receptores Notch/metabolismo , Regulação para Cima/fisiologia , Fator A de Crescimento do Endotélio Vascular/metabolismo , Adulto Jovem
5.
J Gen Physiol ; 151(9): 1094-1115, 2019 09 02.
Artigo em Inglês | MEDLINE | ID: mdl-31358556

RESUMO

Somatostatin secretion from pancreatic islet δ-cells is stimulated by elevated glucose levels, but the underlying mechanisms have only partially been elucidated. Here we show that glucose-induced somatostatin secretion (GISS) involves both membrane potential-dependent and -independent pathways. Although glucose-induced electrical activity triggers somatostatin release, the sugar also stimulates GISS via a cAMP-dependent stimulation of CICR and exocytosis of somatostatin. The latter effect is more quantitatively important and in mouse islets depolarized by 70 mM extracellular K+ , increasing glucose from 1 mM to 20 mM produced an ∼3.5-fold stimulation of somatostatin secretion, an effect that was mimicked by the application of the adenylyl cyclase activator forskolin. Inhibiting cAMP-dependent pathways with PKI or ESI-05, which inhibit PKA and exchange protein directly activated by cAMP 2 (Epac2), respectively, reduced glucose/forskolin-induced somatostatin secretion. Ryanodine produced a similar effect that was not additive to that of the PKA or Epac2 inhibitors. Intracellular application of cAMP produced a concentration-dependent stimulation of somatostatin exocytosis and elevation of cytoplasmic Ca2+ ([Ca2+]i). Both effects were inhibited by ESI-05 and thapsigargin (an inhibitor of SERCA). By contrast, inhibition of PKA suppressed δ-cell exocytosis without affecting [Ca2+]i Simultaneous recordings of electrical activity and [Ca2+]i in δ-cells expressing the genetically encoded Ca2+ indicator GCaMP3 revealed that the majority of glucose-induced [Ca2+]i spikes did not correlate with δ-cell electrical activity but instead reflected Ca2+ release from the ER. These spontaneous [Ca2+]i spikes are resistant to PKI but sensitive to ESI-05 or thapsigargin. We propose that cAMP links an increase in plasma glucose to stimulation of somatostatin secretion by promoting CICR, thus evoking exocytosis of somatostatin-containing secretory vesicles in the δ-cell.


Assuntos
Cálcio/metabolismo , AMP Cíclico/metabolismo , Glucose/farmacologia , Pâncreas/citologia , Células Secretoras de Somatostatina/efeitos dos fármacos , Somatostatina/metabolismo , Adjuvantes Imunológicos/farmacologia , Animais , Membrana Celular/fisiologia , Colforsina/farmacologia , Regulação da Expressão Gênica/efeitos dos fármacos , Fatores de Troca do Nucleotídeo Guanina/genética , Fatores de Troca do Nucleotídeo Guanina/metabolismo , Potenciais da Membrana/efeitos dos fármacos , Potenciais da Membrana/fisiologia , Camundongos , Células Secretoras de Somatostatina/metabolismo , Tapsigargina/farmacologia
6.
Biochem Biophys Res Commun ; 512(2): 352-359, 2019 04 30.
Artigo em Inglês | MEDLINE | ID: mdl-30894274

RESUMO

The ability to detect noxious stimulation is essential to an organism's survival and wellbeing. Chronic pain is characterized by abnormal sensitivity to normal stimulation coupled with a feeling of unpleasantness. This condition afflicts people worldwide and severely impacts their quality of life and has become an escalating health problem. The spinal cord dorsal horn is critically involved in nociception and chronic pain. Especially, the substantia gelatinosa (SG) neurons of lamina II, which receives nociceptive inputs from primary afferents. Two major models are used to study chronic pain in animals, including nerve injury and the injection of a complete Freund's adjuvant (CFA) into the hind paw. However, how these models induce glutamatergic synaptic plasticity in the spinal cord is not fully understood. Here, we studied synaptic plasticity on excitatory transmissions in the adult rat SG neurons. Using in vitro and in vivo whole-cell patch-clamp recording methods, we analyzed spontaneous excitatory postsynaptic currents (sEPSCs) 2 weeks following nerve injury and 1 week following CFA injection. In the spinal slice preparation, these models increased both the frequency and amplitude of sEPSCs in SG neurons. The frequency and amplitude of sEPSCs in the nerve injury and the CFA group were reduced by the presence of tetrodotoxin (TTX). By contrast, TTX did not reduce the sEPSCs compared with miniature EPSCs in naïve rats. Next, we analyzed the active electrophysiological properties of neurons, which included; resting membrane potentials (RMPs) and the generation of action potentials (APs) in vitro. Interestingly, about 20% of recorded SG neurons in this group elicited spontaneous APs (sAPs) without changing the RMPs. Furthermore, we performed in vivo whole-cell patch-clamp recording in SG neurons to analyze active electrophysiological properties under physiological conditions. Importantly, in vivo SG neurons generated sAPs without affecting RMP in the nerve injury and the CFA group. Our study describes how animal models of chronic pain influence both passive and active electrophysiological properties of spinal SG neurons.


Assuntos
Dor Crônica/fisiopatologia , Ácido Glutâmico/fisiologia , Corno Dorsal da Medula Espinal/fisiopatologia , Animais , Modelos Animais de Doenças , Potenciais Pós-Sinápticos Excitadores/fisiologia , Técnicas In Vitro , Inflamação/fisiopatologia , Masculino , Potenciais da Membrana/fisiologia , Modelos Neurológicos , Neuralgia/fisiopatologia , Plasticidade Neuronal/fisiologia , Nociceptividade/fisiologia , Ratos , Ratos Sprague-Dawley , Substância Gelatinosa/fisiologia , Transmissão Sináptica/fisiologia
7.
Neurosci Lett ; 701: 142-145, 2019 05 14.
Artigo em Inglês | MEDLINE | ID: mdl-30802464

RESUMO

Neuronal interactions coupled by phase synchronization have been studied in a wide range of frequency bands, but fluctuations below the delta frequency have often been neglected. In the present study, phase synchrony in slow cortical potentials (SCPs, 0.01-0.1 Hz) was examined during two different mental states; a resting state and a breath-focused mindfulness meditation. SCP phase synchrony in 9 long-term expert meditators (on average 22 years of experience) were compared with the data obtained from 11 novices. Additionally, after the novices attended an 8-week mindfulness-based stress reduction (MBSR) program, SCP phase synchrony was measured again. While expert meditators and novices exhibited the same amount of SCP phase synchrony in the resting state, decreased synchronization was found during meditation among expert meditators as well as novices who had participated in the MBSR program (but not prior to the program). These findings suggest that phase synchrony in slow cortical activity is context-dependent and could provide crucial information in the study of the human mind.


Assuntos
Sincronização Cortical/fisiologia , Meditação/psicologia , Adolescente , Adulto , Encéfalo/fisiologia , Eletroencefalografia , Sincronização de Fases em Eletroencefalografia/fisiologia , Feminino , Humanos , Masculino , Potenciais da Membrana/fisiologia , Atenção Plena
8.
Neurochem Int ; 124: 114-122, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30639195

RESUMO

OBJECTIVE: Some factors related to lifestyle, including stress and high-fat diet (HFD) consumption, are associated with higher prevalence of obesity. These factors can lead to an imbalance between ROS production and antioxidant defenses and to mitochondrial dysfunctions, which, in turn, could cause metabolic impairments, favoring the development of obesity. However, little is known about the interplay between these factors, particularly at early ages, and whether long-term sex-specific changes may occur. Here, we evaluated whether social isolation during the prepubertal period only, associated or not with chronic HFD, can exert long-term effects on oxidative status parameters and on mitochondrial function in the whole hypothalamus, in a sex-specific manner. METHODS: Wistar male and female rats were divided into two groups (receiving standard chow or standard chow + HFD), that were subdivided into exposed or not to social isolation during the prepubertal period. Oxidative status parameters, and mitochondrial function were evaluated in the hypothalamus in the adult age. RESULTS: Regarding antioxidant enzymes activities, HFD decreased GPx activity in the hypothalamus, while increasing SOD activity in females. Females also presented increased total thiols; however, non-protein thiols were lower. Main effects of stress and HFD were observed in TBARS levels in males, with both factors decreasing this parameter. Additionally, HFD increased complex IV activity, and decreased mitochondrial mass in females. Complex I-III activity was higher in males compared to females. CONCLUSION: Stress during the prepubertal period and chronic consumption of HFD had persistent sex-specific effects on oxidative status, as well as on its consequences for the cell and for mitochondrial function. HFD had more detrimental effects on females, inducing oxidative imbalance, which resulted in damage to the mitochondria. This HFD-induced imbalance may be related to the development of obesity.


Assuntos
Dieta Hiperlipídica/efeitos adversos , Hipotálamo/metabolismo , Mitocôndrias/metabolismo , Estresse Oxidativo/fisiologia , Caracteres Sexuais , Estresse Psicológico/metabolismo , Animais , Feminino , Masculino , Potenciais da Membrana/fisiologia , Ratos , Ratos Wistar , Maturidade Sexual/fisiologia , Estresse Psicológico/psicologia
9.
J Neurosci ; 39(15): 2860-2876, 2019 04 10.
Artigo em Inglês | MEDLINE | ID: mdl-30696730

RESUMO

Vestibular ganglion neurons (VGNs) transmit information along parallel neuronal pathways whose signature distinction is variability in spike-timing; some fire at regular intervals while others fire at irregular intervals. The mechanisms driving timing differences are not fully understood but two opposing (but not mutually exclusive) hypotheses have emerged. In the first, regular-spiking is inversely correlated to the density of low-voltage-gated potassium currents (IKL). In the second, regular spiking is directly correlated to the density of hyperpolarization-activated cyclic nucleotide-sensitive currents (IH). Supporting the idea that variations in ion channel composition shape spike-timing, VGNs from the first postnatal week respond to synaptic-noise-like current injections with irregular-firing patterns if they have IKL and with more regular firing patterns if they do not. However, in vitro firing patterns are not as regular as those in vivo Here we considered whether highly-regular spiking requires IH currents and whether this dependence emerges later in development after channel expression matures. We recorded from rat VGN somata of either sex aged postnatal day (P)9-P21. Counter to expectation, in vitro firing patterns were less diverse, more transient-spiking, and more irregular at older ages than at younger ages. Resting potentials hyperpolarized and resting conductance increased, consistent with developmental upregulation of IKL Activation of IH (by increasing intracellular cAMP) increased spike rates but not spike-timing regularity. In a model, we found that activating IH counter-intuitively suppressed regularity by recruiting IKL Developmental upregulation in IKL appears to overwhelm IH These results counter previous hypotheses about how IH shapes vestibular afferent responses.SIGNIFICANCE STATEMENT Vestibular sensory information is conveyed on parallel neuronal pathways with irregularly-firing neurons encoding information using a temporal code and regularly-firing neurons using a rate code. This is a striking example of spike-timing statistics influencing information coding. Previous studies from immature vestibular ganglion neurons (VGNs) identified hyperpolarization-activated mixed cationic currents (IH) as driving highly-regular spiking and proposed that this influence grows with the current during maturation. We found that IH becomes less influential, likely because maturing VGNs also acquire low-voltage-gated potassium currents (IKL), whose inhibitory influence opposes IH Because efferent activity can partly close IKL, VGN firing patterns may become more receptive to extrinsic control. Spike-timing regularity likely relies on dynamic ion channel properties and complementary specializations in synaptic connectivity.


Assuntos
Canais Disparados por Nucleotídeos Cíclicos Ativados por Hiperpolarização/metabolismo , Neurônios Aferentes/fisiologia , Núcleos Vestibulares/fisiologia , Envelhecimento , Animais , AMP Cíclico/metabolismo , Fenômenos Eletrofisiológicos/fisiologia , Feminino , Canais Disparados por Nucleotídeos Cíclicos Ativados por Hiperpolarização/antagonistas & inibidores , Masculino , Potenciais da Membrana/fisiologia , Modelos Neurológicos , Técnicas de Patch-Clamp , Pirimidinas/farmacologia , Ratos , Ratos Long-Evans , Recrutamento Neurofisiológico , Núcleos Vestibulares/citologia , Núcleos Vestibulares/crescimento & desenvolvimento
10.
J Neurophysiol ; 121(1): 140-151, 2019 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-30461371

RESUMO

Transient receptor potential vanilloid type 1 (TRPV1) is a ligand-gated ion channel expressed in the peripheral and central nervous systems. TRPV1-dependent mechanisms take part in a wide range of physiological and pathophysiological pathways including the regulation of homeostatic functions. TRPV1 expression in the hypothalamus has been described as well as evidence that TRPV1-dependent excitatory inputs to hypothalamic preautonomic neurons are diminished in diabetic conditions. Here we aimed to determine the functional expression of TRPV1 in two hypothalamic nuclei known to be involved in the central control of metabolism and to test the hypothesis that TRPV1-expressing neurons receive TRPV1-expressing inputs. A mouse model (TRPV1Cre/tdTom) was generated to identify TRPV1-expressing cells and determine the cellular properties of TRPV1-expressing neurons in adult mice. Our study demonstrated the functional expression of TRPV1 in the dorsomedial hypothalamic nucleus and paraventricular nucleus in adult mice. Our findings revealed that a subset of TRPV1Cre/tdTom neurons receive TRPV1-expressing excitatory inputs, indicating direct interaction between TRPV1-expressing neurons. In addition, astrocytes likely play a role in the modulation of TRPV1-expressing neurons. In summary, this study identified specific hypothalamic regions where TRPV1 is expressed and functional in adult mice and the existence of direct connections between TRPV1Cre/tdTom neurons. NEW & NOTEWORTHY Transient receptor potential vanilloid type 1 (TRPV1) is expressed in the hypothalamus, and TRPV1-dependent regulation of preautonomic neurons is decreased in hyperglycemic conditions. Our study demonstrated functional expression of TRPV1 in two hypothalamic nuclei involved in the control of energy homeostasis. Our results also revealed that a subset of TRPV1-expressing neurons receive TRPV1-expressing excitatory inputs. These findings suggest direct interaction between TRPV1-expressing neurons.


Assuntos
Hipotálamo/metabolismo , Neurônios/metabolismo , Canais de Cátion TRPV/metabolismo , Animais , Astrócitos/citologia , Astrócitos/metabolismo , Dependovirus , Feminino , Hipotálamo/citologia , Proteínas Luminescentes/genética , Proteínas Luminescentes/metabolismo , Masculino , Potenciais da Membrana/fisiologia , Camundongos Transgênicos , Neurônios/citologia , Técnicas de Patch-Clamp , RNA Mensageiro/metabolismo , Canais de Cátion TRPV/genética , Técnicas de Cultura de Tecidos , Proteína Vermelha Fluorescente
11.
Neuropharmacology ; 143: 29-37, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-30240783

RESUMO

Descending brainstem control of spinal nociceptive processing permits a dynamic and adaptive modulation of ascending sensory information. Chronic pain states are frequently associated with enhanced descending excitatory drive mediated predominantly through serotonergic neurones in the rostral ventromedial medulla. In this study, we examine the roles of spinal 5-HT2A and 5-HT3 receptors in modulating ascending sensory output in normal and neuropathic states. In vivo electrophysiology was performed in anaesthetised spinal nerve ligated (SNL) and sham-operated rats to record from wide dynamic range neurones in the ventral posterolateral thalamus. In sham rats, block of spinal 5-HT3Rs with ondansetron revealed tonic facilitation of noxious punctate mechanical stimulation, whereas blocking 5-HT2ARs with ketanserin had minimal effect on neuronal responses to evoked stimuli. The inhibitory profiles of both drugs were altered in SNL rats; ondansetron additionally inhibited neuronal responses to lower intensity punctate mechanical stimuli and noxious heat evoked responses, whereas ketanserin inhibited innocuous and noxious evaporative cooling evoked responses. Neither drug had any effect on dynamic brush evoked responses nor on spontaneous firing rates in both sham and SNL rats. These data identify novel modality and intensity selective facilitatory roles of spinal 5-HT2A and 5-HT3 receptors on sensory neuronal processing within the spinothalamic-somatosensory cortical pathway.


Assuntos
Neuralgia/metabolismo , Dor Nociceptiva/metabolismo , Receptor 5-HT2A de Serotonina/metabolismo , Receptores 5-HT3 de Serotonina/metabolismo , Medula Espinal/metabolismo , Animais , Modelos Animais de Doenças , Ketanserina/farmacologia , Masculino , Potenciais da Membrana/efeitos dos fármacos , Potenciais da Membrana/fisiologia , Vias Neurais/efeitos dos fármacos , Vias Neurais/metabolismo , Neurônios/efeitos dos fármacos , Neurônios/metabolismo , Ondansetron/farmacologia , Ratos Sprague-Dawley , Antagonistas da Serotonina/farmacologia , Medula Espinal/efeitos dos fármacos , Nervos Espinhais/lesões , Tálamo/metabolismo
12.
Neuropharmacology ; 143: 143-152, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-30266598

RESUMO

Emerging evidence has shown the low levels of glutamate (Glu) and glutamine (Gln) and the hypoactivity in the cortex of patients with depression. The hypoactivity is closely related with low frequency of glutamatergic signaling that is affected by the levels of Glu and Gln. Thus, we hypothesized that there might be a causality among low levels of Glu and Gln, hypoactive glutamatergic neurotransmissions, and depressive behaviors. Here, we found low Glu and Gln levels and low frequency of spontaneous excitatory postsynaptic current (sEPSC) of glutamatergic neurons in the medial prefrontal cortex (mPFC) of chronic immobilization stress (CIS)-induced depressed mice. The depressed mice also showed hypoactive Gln synthetase (GS). Inhibition of GS by methionine sulfoximine (MSO) decreased Glu and Gln levels and increased depressive behaviors with low frequency of sEPSC in the mPFC, indicating that Glu and Gln decrements cause hypoactive glutamatergic neurotransmissions and depressive behaviors. Both Glu and Gln could increase sEPSC of glutamatergic neurons in the mPFC on slice patch, but only Gln overcame MSO to increase sEPSC, suggesting that exogenous Gln would recover CIS-induced low frequency of sEPSC caused by hypoactive GS and act as an antidepressant. Expectedly, Gln supplementation showed antidepressant effects against CIS; it increased glutamatergic neurotransmissions with Glu and Gln increment in the mPFC and attenuated depressive behaviors. Moreover, selective glutamatergic activation in the mPFC by optogenetics decreased depressive behavior. In conclusion, depressive behaviors evoked by chronic stress were due to hypoactive glutamatergic neurons in the mPFC caused by low levels of Glu and Gln, and exogenous Gln can be used as an alternative antidepressant to increase glutamatergic neurotransmission.


Assuntos
Transtorno Depressivo/metabolismo , Transtorno Depressivo/terapia , Ácido Glutâmico/metabolismo , Glutamina/administração & dosagem , Glutamina/metabolismo , Córtex Pré-Frontal/metabolismo , Animais , Astrócitos/metabolismo , Astrócitos/patologia , Transtorno Depressivo/patologia , Suplementos Nutricionais , Glutamato-Amônia Ligase/metabolismo , Masculino , Potenciais da Membrana/fisiologia , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Neurônios/metabolismo , Neurônios/patologia , Optogenética , Córtex Pré-Frontal/patologia , Restrição Física , Estresse Psicológico/metabolismo , Estresse Psicológico/patologia , Estresse Psicológico/terapia , Transmissão Sináptica/fisiologia , Técnicas de Cultura de Tecidos
13.
Rev Neurol ; 66(S01): S51-S56, 2018 Mar 01.
Artigo em Espanhol | MEDLINE | ID: mdl-29516453

RESUMO

INTRODUCTION: From a differential perspective, high intellectual ability is an expression of intellectual functioning with characteristic functional correlates and structural correlates of the underlying neural activity that suggests an improved executive capacity as a relevant characteristic, highlighting in it a more effective working memory. DEVELOPMENT: The neuroscientific evidences about the neural mechanisms that can explain the differences are analyzed between the intellectual functioning of the high intellectual ability and the typical intellectual capacity. The possibilities that offer the recording of evoked potentials to capture fundamental mental processes that allow explain the differences between them are put under review. CONCLUSIONS: Neuroscientific evidences through electroencephalography or other mental imagery techniques show that the brain, as a structural correlate of high intellectual abilities, has greater neural efficiency, interconnectivity and differences in the cytoarchitecture. It is a brain that captures, understands and interprets reality in a qualitatively different manner. But the neural differences are structural and the high intellectual capacity emerges from its plasticity functional. That is, it is a brain prepared for better executive regulation that is not always directly related with excellence and the eminent manifestation of its potentiality because it requires other conditioning factors such as motivation, the organization of knowledge, personal traits of temperament or perfectionism, and exogenous conditions.


TITLE: Neurofuncionalidad ejecutiva: estudio comparativo en las altas capacidades.Introduccion. Desde una perspectiva diferencial, la alta capacidad intelectual es una expresion del funcionamiento intelectual con unos correlatos funcionales caracteristicos y unos correlatos estructurales de la actividad neural subyacente que sugieren una capacidad ejecutiva mejorada como caracteristica relevante, destacando en ella una memoria de trabajo mas eficaz. Desarrollo. Se analizan las evidencias neurocientificas sobre los mecanismos neurales que pueden explicar las diferencias entre el funcionamiento intelectual de la alta capacidad intelectual y la capacidad intelectual tipica, y se revisan las posibilidades que ofrece el registro de potenciales evocados para apresar procesos mentales fundamentales que permitan explicar las diferencias entre ellas. Conclusiones. Las evidencias neurocientificas mediante electroencefalografia u otras tecnicas de imagineria mental muestran que el cerebro, como correlato estructural de la alta capacidad intelectual, tiene mayor eficiencia neural, interconectividad y diferencias en la citoarquitectura. Es un cerebro que captura, comprende e interpreta la realidad de forma cualitativamente diferente. Pero las diferencias neurales son estructurales y la alta capacidad intelectual emerge de su plasticidad funcional. Es decir, es un cerebro preparado para una mejor regulacion ejecutiva que no siempre guarda relacion directa con la excelencia y la eminente manifestacion de su potencialidad porque precisa de otros condicionantes como la motivacion, la organizacion del conocimiento, rasgos personales de temperamento o perfeccionismo, y condicionantes exogenos.


Assuntos
Função Executiva/fisiologia , Atividade Nervosa Superior/fisiologia , Inteligência/fisiologia , Encéfalo/diagnóstico por imagem , Encéfalo/fisiologia , Cognição/fisiologia , Tomada de Decisões , Eletroencefalografia , Potenciais Evocados/fisiologia , Humanos , Potenciais da Membrana/fisiologia , Neuroimagem , Plasticidade Neuronal
14.
Clin Neurophysiol ; 129(5): 959-966, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29554578

RESUMO

OBJECTIVE: To assess whether high frequency oscillations (HFOs, >150 Hz), known to occur in basal ganglia nuclei, can be observed in the thalamus. METHODS: We recorded intraoperative local field potentials from the ventral intermediate nucleus (VIM) of the thalamus in patients with Essential Tremor (N = 16), Parkinsonian Tremor (3), Holmes Tremor (2) and Dystonic Tremor (1) during implantation of electrodes for deep brain stimulation. Recordings were performed with up to five micro/macro-electrodes that were simultaneously advanced to the stereotactic target. RESULTS: Thalamic HFOs occurred in all investigated tremor syndromes. A detailed analysis of the Essential Tremor subgroup revealed that medial channels recorded HFOs more frequently than other channels. The highest peaks were observed 4 mm above target. Macro- but not microelectrode recordings were dominated by peaks in the slow HFO band (150-300 Hz), which were stable across several depths and channels. CONCLUSION: HFOs occur in the thalamus and are not specific to any of the tremors investigated. Their spatial distribution is not homogeneous, and their appearance depends on the type of electrode used for recording. SIGNIFICANCE: The occurrence of HFOs in the thalamus of tremor patients indicates that HFOs are not part of basal ganglia pathophysiology.


Assuntos
Potenciais da Membrana/fisiologia , Tálamo/fisiopatologia , Tremor/fisiopatologia , Idoso , Estimulação Encefálica Profunda , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Neurônios/fisiologia , Tremor/terapia
15.
PLoS Comput Biol ; 14(2): e1005960, 2018 02.
Artigo em Inglês | MEDLINE | ID: mdl-29432418

RESUMO

Mammalian thalamocortical relay (TCR) neurons switch their firing activity between a tonic spiking and a bursting regime. In a combined experimental and computational study, we investigated the features in the input signal that single spikes and bursts in the output spike train represent and how this code is influenced by the membrane voltage state of the neuron. Identical frozen Gaussian noise current traces were injected into TCR neurons in rat brain slices as well as in a validated three-compartment TCR model cell. The resulting membrane voltage traces and spike trains were analyzed by calculating the coherence and impedance. Reverse correlation techniques gave the Event-Triggered Average (ETA) and the Event-Triggered Covariance (ETC). This demonstrated that the feature selectivity started relatively long before the events (up to 300 ms) and showed a clear distinction between spikes (selective for fluctuations) and bursts (selective for integration). The model cell was fine-tuned to mimic the frozen noise initiated spike and burst responses to within experimental accuracy, especially for the mixed mode regimes. The information content carried by the various types of events in the signal as well as by the whole signal was calculated. Bursts phase-lock to and transfer information at lower frequencies than single spikes. On depolarization the neuron transits smoothly from the predominantly bursting regime to a spiking regime, in which it is more sensitive to high-frequency fluctuations. The model was then used to elucidate properties that could not be assessed experimentally, in particular the role of two important subthreshold voltage-dependent currents: the low threshold activated calcium current (IT) and the cyclic nucleotide modulated h current (Ih). The ETAs of those currents and their underlying activation/inactivation states not only explained the state dependence of the firing regime but also the long-lasting concerted dynamic action of the two currents. Finally, the model was used to investigate the more realistic "high-conductance state", where fluctuations are caused by (synaptic) conductance changes instead of current injection. Under "standard" conditions bursts are difficult to initiate, given the high degree of inactivation of the T-type calcium current. Strong and/or precisely timed inhibitory currents were able to remove this inactivation.


Assuntos
Potenciais de Ação/fisiologia , Neurônios/fisiologia , Técnicas de Patch-Clamp , Tálamo/fisiologia , Animais , Encéfalo/metabolismo , Cálcio/metabolismo , Canais de Cálcio/metabolismo , Contagem de Células , Eletrofisiologia , Análise de Fourier , Corpos Geniculados/fisiologia , Potenciais da Membrana/fisiologia , Modelos Neurológicos , Distribuição Normal , Distribuição de Poisson , Probabilidade , Ratos , Ratos Wistar , Processamento de Sinais Assistido por Computador
16.
Pflugers Arch ; 470(4): 613-621, 2018 04.
Artigo em Inglês | MEDLINE | ID: mdl-29344775

RESUMO

The plasma membrane of parotid acinar cells is functionally divided into apical and basolateral regions. According to the current model, fluid secretion is driven by transepithelial ion gradient, which facilitates water movement by osmosis into the acinar lumen from the interstitium. The osmotic gradient is created by the apical Cl- efflux and the subsequent paracellular Na+ transport. In this model, the Na+-K+ pump is located exclusively in the basolateral membrane and has essential role in salivary secretion, since the driving force for Cl- transport via basolateral Na+-K+-2Cl- cotransport is generated by the Na+-K+ pump. In addition, the continuous electrochemical gradient for Cl- flow during acinar cell stimulation is maintained by the basolateral K+ efflux. However, using a combination of single-cell electrophysiology and Ca2+-imaging, we demonstrate that photolysis of Ca2+ close to the apical membrane of parotid acinar cells triggered significant K+ current, indicating that a substantial amount of K+ is secreted into the lumen during stimulation. Nevertheless, the K+ content of the primary saliva is relatively low, suggesting that K+ might be reabsorbed through the apical membrane. Therefore, we investigated the localization of Na+-K+ pumps in acinar cells. We show that the pumps appear evenly distributed throughout the whole plasma membrane, including the apical pole of the cell. Based on these results, a new mathematical model of salivary fluid secretion is presented, where the pump reabsorbs K+ from and secretes Na+ to the lumen, which can partially supplement the paracellular Na+ pathway.


Assuntos
Células Acinares/metabolismo , Transporte Biológico/fisiologia , Transporte de Íons/fisiologia , Glândula Parótida/metabolismo , Potássio/metabolismo , Saliva/metabolismo , Sódio/metabolismo , Células Acinares/fisiologia , Animais , Membrana Celular/metabolismo , Membrana Celular/fisiologia , Cloretos/metabolismo , Potenciais da Membrana/fisiologia , Camundongos , Glândula Parótida/fisiologia , Salivação/fisiologia
17.
Eur Neuropsychopharmacol ; 28(1): 211-224, 2018 01.
Artigo em Inglês | MEDLINE | ID: mdl-29174530

RESUMO

We have previously shown that prebiotics (dietary fibres that augment the growth of indigenous beneficial gut bacteria) such as Bimuno™ galacto-oligosaccharides (B-GOS®), increased N-methyl-D-aspartate (NMDA) receptor levels in the rat brain. The current investigation examined the functional correlates of these changes in B-GOS®-fed rats by measuring cortical neuronal responses to NMDA using in vivo NMDA micro-iontophoresis electrophysiology, and performance in the attentional set-shifting task. Adult male rats were supplemented with B-GOS® in the drinking water 3 weeks prior to in vivo iontophoresis or behavioural testing. Cortical neuronal responses to NMDA iontophoresis, were greater (+30%) in B-GOS® administered rats compared to non-supplemented controls. The intake of B-GOS® also partially hindered the reduction of NMDA responses by the glycine site antagonist, HA-966. In the attentional set-shifting task, B-GOS® -fed rats shifted from an intra-dimensional to an extra-dimensional set in fewer trials than controls, thereby indicating greater cognitive flexibility. An initial exploration into the mechanisms revealed that rats ingesting B-GOS® had increased levels of plasma acetate, and cortical GluN2B subunits and Acetyl Co-A Carboxylase mRNA. These changes were also observed in rats fed daily for 3 weeks with glyceryl triacetate, though unlike B-GOS®, cortical histone deacetylase (HDAC1, HDAC2) mRNAs were also increased which suggested an additional epigenetic action of direct acetate supplementation. Our data demonstrate that a pro-cognitive effect of B-GOS® intake in rats is associated with an increase in cortical NMDA receptor function, but the role of circulating acetate derived from gut bacterial fermentation of this prebiotic requires further investigation.


Assuntos
Atenção/fisiologia , Córtex Cerebral/metabolismo , Suplementos Nutricionais , N-Metilaspartato/metabolismo , Neurônios/metabolismo , Prebióticos/administração & dosagem , Animais , Córtex Cerebral/efeitos dos fármacos , Função Executiva/fisiologia , Masculino , Potenciais da Membrana/efeitos dos fármacos , Potenciais da Membrana/fisiologia , Neurônios/efeitos dos fármacos , Neurotransmissores/farmacologia , Distribuição Aleatória , Ratos Sprague-Dawley , Triglicerídeos/administração & dosagem
18.
Sci Rep ; 7(1): 17543, 2017 12 13.
Artigo em Inglês | MEDLINE | ID: mdl-29235496

RESUMO

Fibromyalgia (FM) results in pain characterized by low selenium (Se) levels, excessive Ca2+ influx, reactive oxygen species (ROS) production, and acidic pH. TRPM2 and TRPV1 are activated by ROS and acid; nevertheless, their roles have not been elucidated in FM. Therefore, we investigated the contribution of TRPM2 and TRPV1 to pain, oxidative stress, and apoptosis in a rat model of FM and the therapeutic potential of Se. Thirty-six rats were divided into four groups: control, Se, FM, and FM + Se. The Se treatment reduced the FM-induced increase in TRPM2 and TRPV1 currents, pain intensity, intracellular free Ca2+, ROS, and mitochondrial membrane depolarization in the sciatic (SciN) and dorsal root ganglion (DRGN) neurons. Furthermore, Se treatment attenuated the FM-induced decrease in cell viability in the DRGN and SciN, glutathione peroxidase, and reduced glutathione and α-tocopherol values in the DRGN, SciN, brain, muscle, and plasma; however, lipid peroxidation levels were decreased. Se also attenuated PARP1, caspase 3, and 9 expressions in the SciN, DRGN, and muscle. In conclusion, Se treatment decreased the FM-induced increase in hyperalgesia, ROS, apoptosis, and Ca2+ entry through TRPM2 and TRPV1 in the SciN and DRGN. Our findings may be relevant to the elucidation and treatment of FM.


Assuntos
Apoptose/fisiologia , Fibromialgia/metabolismo , Hiperalgesia/metabolismo , Estresse Oxidativo/fisiologia , Canais de Cátion TRPM/metabolismo , Canais de Cátion TRPV/metabolismo , Analgésicos/farmacologia , Animais , Apoptose/efeitos dos fármacos , Cálcio/metabolismo , Modelos Animais de Doenças , Feminino , Fibromialgia/tratamento farmacológico , Hiperalgesia/tratamento farmacológico , Potenciais da Membrana/efeitos dos fármacos , Potenciais da Membrana/fisiologia , Neurônios/efeitos dos fármacos , Neurônios/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Limiar da Dor/efeitos dos fármacos , Ratos Wistar , Selênio/farmacologia
19.
Front Neural Circuits ; 11: 68, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-29033795

RESUMO

Predator pressure and olfactory cues (alarm substance) have been shown to modulate Mauthner cell (M-cell) initiated startle escape responses (C-starts) in teleost fish. The regulation of such adaptive responses to potential threats is thought to involve the release of steroid hormones such as cortisol. However, the mechanism by which cortisol may regulate M-cell excitability is not known. Here, we used intrasomatic, in vivo recordings to elucidate the acute effects of cortisol on M-cell membrane properties and sound evoked post-synaptic potentials (PSPs). Cortisol tonically decreased threshold current in the M-cell within 10 min before trending towards baseline excitability over an hour later, which may indicate the involvement of non-genomic mechanisms. Consistently, current ramp injection experiments showed that cortisol increased M-cell input resistance in the depolarizing membrane, i.e., by a voltage-dependent postsynaptic mechanism. Cortisol also increases the magnitude of sound-evoked M-cell PSPs by reducing the efficacy of local feedforward inhibition (FFI). Interestingly, another pre-synaptic inhibitory network mediating prepulse inhibition (PPI) remained unaffected. Together, our results suggest that cortisol rapidly increases M-cell excitability via a post-synaptic effector mechanism, likely a chloride conductance, which, in combination with its dampening effect on FFI, will modulate information processing to reach threshold. Given the central role of the M-cell in initiating startle, these results are consistent with a role of cortisol in mediating the expression of a vital behavior.


Assuntos
Hidrocortisona/metabolismo , Neurônios/citologia , Neurônios/metabolismo , Reflexo de Sobressalto/fisiologia , Estimulação Acústica , Animais , Percepção Auditiva/fisiologia , Retroalimentação Fisiológica/fisiologia , Carpa Dourada , Potenciais da Membrana/fisiologia , Microeletrodos , Inibição Neural/fisiologia , Vias Neurais/citologia , Vias Neurais/metabolismo
20.
Neural Comput ; 29(10): 2581-2632, 2017 10.
Artigo em Inglês | MEDLINE | ID: mdl-28777719

RESUMO

With our ability to record more neurons simultaneously, making sense of these data is a challenge. Functional connectivity is one popular way to study the relationship of multiple neural signals. Correlation-based methods are a set of currently well-used techniques for functional connectivity estimation. However, due to explaining away and unobserved common inputs (Stevenson, Rebesco, Miller, & Körding, 2008 ), they produce spurious connections. The general linear model (GLM), which models spike trains as Poisson processes (Okatan, Wilson, & Brown, 2005 ; Truccolo, Eden, Fellows, Donoghue, & Brown, 2005 ; Pillow et al., 2008 ), avoids these confounds. We develop here a new class of methods by using differential signals based on simulated intracellular voltage recordings. It is equivalent to a regularized AR(2) model. We also expand the method to simulated local field potential recordings and calcium imaging. In all of our simulated data, the differential covariance-based methods achieved performance better than or similar to the GLM method and required fewer data samples. This new class of methods provides alternative ways to analyze neural signals.


Assuntos
Potenciais da Membrana , Neurônios/fisiologia , Processamento de Sinais Assistido por Computador , Animais , Cálcio/metabolismo , Córtex Cerebral/fisiologia , Simulação por Computador , Potenciais da Membrana/fisiologia , Modelos Neurológicos , Análise Multivariada , Vias Neurais/fisiologia , Técnicas de Patch-Clamp , Sinapses/fisiologia , Tálamo/fisiologia , Imagens com Corantes Sensíveis à Voltagem
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