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1.
J Neuroinflammation ; 21(1): 165, 2024 Jun 27.
Artigo em Inglês | MEDLINE | ID: mdl-38937750

RESUMO

BACKGROUND: Traumatic brain injury (TBI) is a significant risk factor for Alzheimer's disease (AD), and accumulating evidence supports a role for adaptive immune B and T cells in both TBI and AD pathogenesis. We previously identified B cell and major histocompatibility complex class II (MHCII)-associated invariant chain peptide (CLIP)-positive B cell expansion after TBI. We also showed that antagonizing CLIP binding to the antigen presenting groove of MHCII after TBI acutely reduced CLIP + splenic B cells and was neuroprotective. The current study investigated the chronic effects of antagonizing CLIP in the 5xFAD Alzheimer's mouse model, with and without TBI. METHODS: 12-week-old male wild type (WT) and 5xFAD mice were administered either CLIP antagonist peptide (CAP) or vehicle, once at 30 min after either sham or a lateral fluid percussion injury (FPI). Analyses included flow cytometric analysis of immune cells in dural meninges and spleen, histopathological analysis of the brain, magnetic resonance diffusion tensor imaging, cerebrovascular analysis, and assessment of motor and neurobehavioral function over the ensuing 6 months. RESULTS: 9-month-old 5xFAD mice had significantly more CLIP + B cells in the meninges compared to age-matched WT mice. A one-time treatment with CAP significantly reduced this population in 5xFAD mice. Importantly, CAP also improved some of the immune, histopathological, and neurobehavioral impairments in 5xFAD mice over the ensuing six months. Although FPI did not further elevate meningeal CLIP + B cells, it did negate the ability of CAP to reduce meningeal CLIP + B cells in the 5xFAD mice. FPI at 3 months of age exacerbated some aspects of AD pathology in 5xFAD mice, including further reducing hippocampal neurogenesis, increasing plaque deposition in CA3, altering microgliosis, and disrupting the cerebrovascular structure. CAP treatment after injury ameliorated some but not all of these FPI effects.


Assuntos
Antígenos de Diferenciação de Linfócitos B , Linfócitos B , Lesões Encefálicas Traumáticas , Antígenos de Histocompatibilidade Classe II , Camundongos Transgênicos , Animais , Camundongos , Masculino , Lesões Encefálicas Traumáticas/patologia , Lesões Encefálicas Traumáticas/tratamento farmacológico , Antígenos de Histocompatibilidade Classe II/metabolismo , Linfócitos B/efeitos dos fármacos , Meninges/patologia , Meninges/efeitos dos fármacos , Precursor de Proteína beta-Amiloide/genética , Doença de Alzheimer/patologia , Doença de Alzheimer/tratamento farmacológico , Humanos , Modelos Animais de Doenças , Presenilina-1/genética , Camundongos Endogâmicos C57BL
2.
Soft Matter ; 19(36): 6871-6874, 2023 Sep 20.
Artigo em Inglês | MEDLINE | ID: mdl-37682026

RESUMO

Pure cyclic diamino acids (CdAA) gel differently than combinations of CdAAs, altering the gelation behavior to highly-branched colloidal protein crystal networks reminiscent of traditional fat crystal networks in canola oil, making it an exciting structuring agent for unsaturated oils.

3.
Ann Oncol ; 33(12): 1318-1327, 2022 12.
Artigo em Inglês | MEDLINE | ID: mdl-36122798

RESUMO

BACKGROUND: Breast cancer has a significant heritable basis, of which ∼60% remains unexplained. Testing for BRCA1/BRCA2 offers useful discrimination of breast cancer risk within families, and identification of additional breast cancer susceptibility genes could offer clinical utility. PATIENTS AND METHODS: We included 2135 invasive breast cancer cases recruited via the Breast and Ovarian Cancer Susceptibility study, a retrospective UK study of familial breast cancer. ELIGIBILITY CRITERIA: female, BRCA-negative, white European ethnicity, and one of: (i) breast cancer family history, (ii) bilateral disease, (iii) young age of onset (<30 years), and (iv) concomitant ovarian cancer. We undertook exome sequencing of cases and carried out gene-level burden testing of rare damaging variants against those from 51 377 ethnicity-matched population controls from gnomAD. RESULTS: 159/2135 (7.4%) cases had a qualifying variant in an established breast cancer susceptibility gene, with minimal evidence of signal in other cancer susceptibility genes. Known breast cancer susceptibility genes PALB2, CHEK2, and ATM were the only genes to retain statistical significance after correcting for multiple testing. Due to the enrichment of hereditary cases in the series, we had good power (>80%) to detect a gene of BRCA1-like risk [odds ratio (OR) = 10.6] down to a population minor allele frequency of 4.6 × 10-5 (1 in 10 799, less than one-tenth that of BRCA1)and of PALB2-like risk (OR = 5.0) down to a population minor allele frequency of 2.8 × 10-4 (1 in 1779, less than half that of PALB2). Power was lower for identification of novel moderate penetrance genes (OR = 2-3) like CHEK2 and ATM. CONCLUSIONS: This is the largest case-control whole-exome analysis of enriched breast cancer published to date. Whilst additional breast cancer susceptibility genes likely exist, those of high penetrance are likely to be of very low mutational frequency. Contention exists regarding the clinical utility of such genes.


Assuntos
Neoplasias da Mama , Neoplasias Ovarianas , Neoplasias de Mama Triplo Negativas , Feminino , Humanos , Adulto , Mutação em Linhagem Germinativa , Neoplasias da Mama/genética , Neoplasias da Mama/diagnóstico , Estudos Retrospectivos , Predisposição Genética para Doença , Neoplasias Ovarianas/genética
4.
Eur Cell Mater ; 44: 1-20, 2022 08 02.
Artigo em Inglês | MEDLINE | ID: mdl-35916474

RESUMO

Chronic tendinopathy represents a growing healthcare burden in the ageing global population. Curative therapies remain elusive as the mechanisms that underlie chronic inflammation in tendon disease remain unclear. Identifying and isolating key pathogenic and reparative cells is essential in developing precision therapies and implantable materials for improved tendon healing. Multiple discrete human tendon cell populations have been previously described ex vivo. To determine if these populations persist in vitro, healthy human hamstring tenocytes were cultured for 8 d on either tissue culture plastic or aligned electrospun fibres of absorbable polydioxanone. Novel single-cell surface proteomics combined with unbiased single-cell transcriptomics (CITE-Seq) was used to identify discrete tenocyte populations. 6 cell populations were found, 4 of which shared key gene expression determinants with ex vivo human cell clusters: PTX3_PAPPA, POSTN_SCX, DCN_LUM and ITGA7_NES. Surface proteomics found that PTX3_PAPPA cells were CD10+CD26+CD54+. ITGA7_NES cells were CD146+ and POSTN_SCX cells were CD90+CD95+CD10+. Culture on the aligned electrospun fibres favoured 3 cell subtypes (DCN_LUM, POSTN_SCX and PTX3_ PAPPA), promoting high expression of tendon-matrix-associated genes and upregulating gene sets enriched for TNF-a and IL-6/STAT3 signalling. Discrete human tendon cell subpopulations persisted in in vitro culture and could be recognised by specific gene and surface-protein signatures. Aligned polydioxanone fibres promoted the survival of 3 clusters, including pro-inflammatory PTX3-expressing CD10+CD26+CD54+ cells found in chronic tendon disease. These results improved the understanding of preferred culture conditions for different tenocyte subpopulations and informed the development of in vitro models of tendon disease.


Assuntos
Dipeptidil Peptidase 4 , Polidioxanona , Células Cultivadas , Dipeptidil Peptidase 4/metabolismo , Humanos , Tendões/patologia , Tenócitos/metabolismo , Cicatrização
5.
Int J Mol Sci ; 23(17)2022 Aug 30.
Artigo em Inglês | MEDLINE | ID: mdl-36077246

RESUMO

TBI induces splenic B and T cell expansion that contributes to neuroinflammation and neurodegeneration. The vagus nerve, the longest of the cranial nerves, is the predominant parasympathetic pathway allowing the central nervous system (CNS) control over peripheral organs, including regulation of inflammatory responses. One way this is accomplished is by vagus innervation of the celiac ganglion, from which the splenic nerve innervates the spleen. This splenic innervation enables modulation of the splenic immune response, including splenocyte selection, activation, and downstream signaling. Considering that the left and right vagus nerves have distinct courses, it is possible that they differentially influence the splenic immune response following a CNS injury. To test this possibility, immune cell subsets were profiled and quantified following either a left or a right unilateral vagotomy. Both unilateral vagotomies caused similar effects with respect to the percentage of B cells and in the decreased percentage of macrophages and T cells following vagotomy. We next tested the hypothesis that a left unilateral vagotomy would modulate the splenic immune response to a traumatic brain injury (TBI). Mice received a left cervical vagotomy or a sham vagotomy 3 days prior to a fluid percussion injury (FPI), a well-characterized mouse model of TBI that consistently elicits an immune and neuroimmune response. Flow cytometric analysis showed that vagotomy prior to FPI resulted in fewer CLIP+ B cells, and CD4+, CD25+, and CD8+ T cells. Vagotomy followed by FPI also resulted in an altered distribution of CD11bhigh and CD11blow macrophages. Thus, transduction of immune signals from the CNS to the periphery via the vagus nerve can be targeted to modulate the immune response following TBI.


Assuntos
Lesões Encefálicas Traumáticas , Vagotomia , Animais , Lesões Encefálicas Traumáticas/metabolismo , Lesões Encefálicas Traumáticas/cirurgia , Modelos Animais de Doenças , Camundongos , Baço , Nervo Vago/metabolismo
6.
Dev Biol ; 462(1): 74-84, 2020 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-32147304

RESUMO

The five vestibular organs of the inner ear derive from patches of prosensory cells that express the transcription factor SOX2 and the Notch ligand JAG1. Previous work suggests that JAG1-mediated Notch signaling is both necessary and sufficient for prosensory formation and that the separation of developing prosensory patches is regulated by LMX1a, which antagonizes Notch signaling. We used an inner ear-specific deletion of the Rbpjκ gene in which Notch signaling is progressively lost from the inner ear to show that Notch signaling, is continuously required for the maintenance of prosensory fate. Loss of Notch signaling in prosensory patches causes them to shrink and ultimately disappear. We show this loss of prosensory fate is not due to cell death, but rather to the conversion of prosensory tissue into non-sensory tissue that expresses LMX1a. Notch signaling is therefore likely to stabilize, rather than induce prosensory fate.


Assuntos
Orelha Interna/embriologia , Proteína Jagged-1/metabolismo , Receptores Notch/metabolismo , Animais , Proteínas de Ligação ao Cálcio/metabolismo , Diferenciação Celular , Orelha Interna/metabolismo , Regulação da Expressão Gênica no Desenvolvimento/genética , Células Ciliadas Auditivas Internas/citologia , Proteína Jagged-1/genética , Proteínas com Homeodomínio LIM/metabolismo , Masculino , Proteínas de Membrana/metabolismo , Camundongos , Camundongos Endogâmicos ICR , Organogênese/fisiologia , Receptores Notch/fisiologia , Fatores de Transcrição SOXB1/genética , Fatores de Transcrição SOXB1/metabolismo , Transdução de Sinais , Fatores de Transcrição/metabolismo
7.
Med Vet Entomol ; 35(3): 231-238, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-33480060

RESUMO

Onchocerciasis is a neglected tropical disease (NTD) caused by Onchocerca Diesing 1841 (Spirurida: Onchocercidae) nematodes transmitted by blackflies. It is associated with poverty and imposes a significant health, welfare and economic burden on many tropical countries. Current methods to visualize infections within the vectors rely on invasive methods. However, using micro-computed tomography techniques, without interference from physical tissue manipulation, we visualized in three dimensions for the first time an L1 larva of an Onchocerca species within the thoracic musculature of a blackfly, Simulium damnosum s.l. Theobald 1903 (Diptera: Simuliidae), naturally infected in Ghana. The possibility that thicker peritrophic membranes in savannah flies could account for their lower parasite loads was not supported, but there were limits to our analysis. While there were no statistically significant differences between the mean thicknesses of the peritrophic membranes, in the anterior, dorsal and ventral regions, of forest and savannah blackflies killed 34-48 min after a blood-meal, the thickness of the peritrophic membrane in the posterior region could not be measured. Micro-computed tomography has the potential to provide novel information on many other parasite/vector systems and impactful images for public engagement in health education.


Assuntos
Oncocercose , Simuliidae , Animais , Florestas , Insetos Vetores , Onchocerca , Oncocercose/veterinária , Microtomografia por Raio-X
8.
Int J Qual Health Care ; 33(1)2021 Feb 20.
Artigo em Inglês | MEDLINE | ID: mdl-33196785

RESUMO

OBJECTIVE: The implementation of clinical quality indicators for monitoring cancer care in regional, rural and remote areas. DESIGN: Retrospective data from a population-based Clinical Quality Registry for lung, colorectal and breast cancers. SETTING: All major health services in the Barwon South Western region, Victoria, Australia. PARTICIPANTS: All patients who were diagnosed with cancer and who presented to a health service. INTERVENTION(S): Clinical subgroups to review variations. MAIN OUTCOME MEASURES(S): Clinical quality indicators for lung, colorectal and breast cancers. RESULTS: Clinical indicators included the following: discussion at multidisciplinary meetings, the timeliness of care provided and the type of care for different stages of the disease and survival outcomes. Many of the derived clinical indicator targets were reached. However, variations led to an improvement in the tumour stage being recorded in the medical record; an improved awareness of the need for adjuvant chemotherapy for colorectal cancer; a reduction in time to treatment for lung cancer and a reduced time to surgery for breast cancer, and the 30-day mortality post-treatment for all of the tumour streams was highlighted. CONCLUSIONS: Clinical quality indicators allow for valuable insights into patterns of care. These indicators are easily reproduced and may be of use to other cancer centres and health services.


Assuntos
Neoplasias da Mama , Neoplasias Pulmonares , Neoplasias da Mama/terapia , Feminino , Humanos , Estudos Retrospectivos , População Rural , Vitória
9.
Disasters ; 45(1): 252, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31232480

RESUMO

The above article from Disasters, published online on 24 June 2019 in Wiley Online Library (http://wileyonlinelibrary.com) has been withdrawn by agreement among the authors, the Journal editors and John Wiley & Sons Inc. on behalf of ODI. The withdrawal has been agreed because this is a duplicate of an article that has been published in Disasters Volume 44 Issue 1.

10.
J Biol Chem ; 294(20): 8023-8036, 2019 05 17.
Artigo em Inglês | MEDLINE | ID: mdl-30936203

RESUMO

G protein-coupled receptor (GPCR) signaling is regulated by members of the protein kinase C (PKC) and GPCR kinase (GRK) families, although the relative contribution of each to GPCR function varies among specific GPCRs. The CXC motif receptor 4 (CXCR4) is a member of the GPCR superfamily that binds the CXC motif chemokine ligand 12 (CXCL12), initiating signaling that is subsequently terminated in part by internalization and lysosomal degradation of CXCR4. The purpose of this study is to define the relative contribution of PKC and GRK to CXCR4 signaling attenuation by studying their effects on CXCR4 lysosomal trafficking and degradation. Our results demonstrate that direct activation of PKC via the phorbol ester phorbol 12-myristate 13-acetate (PMA) mimics CXCL12-mediated desensitization, internalization, ubiquitination, and lysosomal trafficking of CXCR4. In agreement, heterologous activation of PKC by stimulating the chemokine receptor CXCR5 with its ligand, CXCL13, also mimics CXCL12-mediated desensitization, internalization, ubiquitination, and lysosomal degradation of CXCR4. Similar to CXCL12, PMA promotes PKC-dependent phosphorylation of serine residues within CXCR4 C-tail that are required for binding and ubiquitination by the E3 ubiquitin ligase AIP4 (atrophin-interacting protein 4). However, inhibition of PKC activity does not alter CXCL12-mediated ubiquitination and degradation of CXCR4, suggesting that other kinases are also required. Accordingly, siRNA-mediated depletion of GRK6 results in decreased degradation and ubiquitination of CXCR4. Overall, these results suggest that PKC and GRK6 contribute to unique aspects of CXCR4 phosphorylation and lysosomal degradation to ensure proper signal propagation and termination.


Assuntos
Lisossomos/metabolismo , Proteólise , Receptores CXCR4/metabolismo , Transdução de Sinais , Ubiquitinação , Quimiocina CXCL12/genética , Quimiocina CXCL12/metabolismo , Quimiocina CXCL13/genética , Quimiocina CXCL13/metabolismo , Ativação Enzimática/efeitos dos fármacos , Ativação Enzimática/genética , Quinases de Receptores Acoplados a Proteína G/genética , Quinases de Receptores Acoplados a Proteína G/metabolismo , Células HEK293 , Células HeLa , Humanos , Lisossomos/genética , Proteína Quinase C/genética , Proteína Quinase C/metabolismo , Transporte Proteico/efeitos dos fármacos , Transporte Proteico/genética , Receptores CXCR4/genética , Proteínas Repressoras/genética , Proteínas Repressoras/metabolismo , Acetato de Tetradecanoilforbol/farmacologia , Ubiquitina-Proteína Ligases/genética , Ubiquitina-Proteína Ligases/metabolismo
11.
J Exp Child Psychol ; 196: 104825, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32344117

RESUMO

The ability to keep perception constant despite environmental changes of illumination, viewing angle, or distance is a key feature of perception. Here, we investigated how "perceptual constancy" relates to language learning by investigating the relationship between color constancy and color term knowledge in 3- and 4-year-old children. We used a novel method to test color constancy where children are required to match colored stimuli under different illuminations. We found a positive relationship between color constancy and color term knowledge; children who knew more color words also had better color constancy. The relationship remained even when accounting for the effect of age and ability to discriminate colors. The findings have implications for understanding the development of perceptual constancy, language learning, and the link between perceptual processing and cognitive development.


Assuntos
Percepção de Cores/fisiologia , Cor , Conhecimento , Vocabulário , Pré-Escolar , Feminino , Humanos , Masculino , Estimulação Luminosa
13.
Disasters ; 44(1): 205-228, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31524986

RESUMO

While the public can play a vital role in saving lives during emergencies, intervention is only effective if people have the skills, confidence, and willingness to help. This review employs a five-stage framework to systematically analyse first aid and emergency helping literature from 22 countries (predominately in Asia, Australia, Europe, and the United States). The review covers 54 articles that investigate public first-aid knowledge and uptake of first-aid training (40); public confidence in first-aid skills and willingness to help during an emergency (21); and barriers to or enablers of learning first aid and delivering first aid in an emergency (25). The findings identify high levels of perceived knowledge, confidence, and willingness to help, supporting the contention that the public can play a vital role during an emergency. However, the findings also point to low uptake levels, low tested skill-specific knowledge, and barriers to learning first aid and helping, indicating that the first-aid training landscape is in need of improvement.


Assuntos
Primeiros Socorros , Educação em Saúde/estatística & dados numéricos , Humanos
14.
Int J Mol Sci ; 21(20)2020 Oct 09.
Artigo em Inglês | MEDLINE | ID: mdl-33050322

RESUMO

Traumatic brain injury (TBI) precedes the onset of epilepsy in up to 15-20% of symptomatic epilepsies and up to 5% of all epilepsy. Treatment of acquired epilepsies, including post-traumatic epilepsy (PTE), presents clinical challenges, including frequent resistance to anti-epileptic therapies. Considering that over 1.6 million Americans present with a TBI each year, PTE is an urgent clinical problem. Neuroinflammation is thought to play a major causative role in many of the post-traumatic syndromes, including PTE. Increasing evidence suggests that neuroinflammation facilitates and potentially contributes to seizure induction and propagation. The inflammatory cytokine, macrophage migration inhibitory factor (MIF), is elevated after TBI and higher levels of MIF correlate with worse post-traumatic outcomes. MIF was recently demonstrated to directly alter the firing dynamics of CA1 pyramidal neurons in the hippocampus, a structure critically involved in many types of seizures. We hypothesized that antagonizing MIF after TBI would be anti-inflammatory, anti-neuroinflammatory and neuroprotective. The results show that administering the MIF antagonist ISO1 at 30 min after TBI prevented astrocytosis but was not neuroprotective in the peri-lesion cortex. The results also show that ISO1 inhibited the TBI-induced increase in γδT cells in the gut, and the percent of B cells infiltrating into the brain. The ISO1 treatment also increased this population of B cells in the spleen. These findings are discussed with an eye towards their therapeutic potential for post-traumatic syndromes, including PTE.


Assuntos
Lesões Encefálicas Traumáticas/imunologia , Lesões Encefálicas Traumáticas/metabolismo , Ativação Linfocitária/imunologia , Linfócitos/imunologia , Linfócitos/metabolismo , Fatores Inibidores da Migração de Macrófagos/metabolismo , Animais , Astrócitos/metabolismo , Linfócitos B/imunologia , Linfócitos B/metabolismo , Lesões Encefálicas Traumáticas/patologia , Proliferação de Células , Humanos , Imunidade Inata , Imunoterapia Adotiva , Degeneração Neural , Baço , Subpopulações de Linfócitos T
15.
Int Nurs Rev ; 67(4): 554-559, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33006173

RESUMO

AIM: To argue that nurse practitioners have been under-utilized generally in the current global health environment, creating barriers to achieving universal health coverage and the Sustainable Development Goals. BACKGROUND: Nurse practitioners are advanced practice nurses possessing expert knowledge and leadership skills that can be optimized to narrow disparities and ensure access to high-quality health care globally. Nurses worldwide have been challenged to meet global public health needs in the context of COVID-19 (SARS-CoV-2 virus), and there are early indications that nurse practitioners are being called upon to the full extent of their capabilities in the current pandemic. SOURCES OF EVIDENCE: PubMed; Google Scholar; the International Council of Nurses; World Health Organization; United Nations; and the experiences of the authors. DISCUSSION: Several international reports, nursing and health organizations have called for continued investment in and development of nursing to improve mechanisms that promote cost-effective and universally accessible care. Expanding nurse practitioner scopes of practice across nations will leverage their clinical capacities, policy and advocacy skills, and talents to lead at all levels. CONCLUSION: Ongoing empirical data and policy change is needed to enable the full scope and strategic utilization of nurse practitioners across healthcare systems and contexts. IMPLICATIONS FOR NURSING PRACTICE, AND NURSING AND HEALTH POLICY: Widespread education regarding nurse practitioner capacities for interdisciplinary partners, policymakers and the public is needed. Policies that safely expand their roles are critical. Role titles and remuneration reflective of their scope and service are required to lead, sustain and grow the workforce internationally.


Assuntos
COVID-19/epidemiologia , Medicina Baseada em Evidências , Saúde Global , Liderança , Profissionais de Enfermagem/organização & administração , Papel do Profissional de Enfermagem , Prática Avançada de Enfermagem/organização & administração , COVID-19/enfermagem , Humanos , Enfermeiros Clínicos/organização & administração , Pesquisa em Avaliação de Enfermagem , Guias de Prática Clínica como Assunto
16.
Am J Physiol Renal Physiol ; 317(4): F957-F966, 2019 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-31432707

RESUMO

Toll-like receptor 4 (TLR4) activation contributes to vascular dysfunction in pathological conditions such as hypertension and diabetes, but the role of chronic TLR4 activation on renal autoregulatory behavior is unknown. We hypothesized that subclinical TLR4 stimulation with low-dose lipopolysaccharide (LPS) infusion increases TLR4 activation and blunts renal autoregulatory behavior. We assessed afferent arteriolar autoregulatory behavior in male Sprague-Dawley rats after prolonged LPS (0.1 mg·kg-1·day-1 sq) infusion via osmotic minipump for 8 or 14 days. Some rats also received daily cotreatment with either anti-TLR4 antibody (1 µg ip), competitive antagonist peptide (CAP; 3 mg/kg ip) or tempol (2 mmol/l, drinking water) throughout the 8-day LPS treatment period. Autoregulatory behavior was assessed using the in vitro blood-perfused juxtamedullary nephron preparation. Selected physiological measures, systolic blood pressure and baseline diameters were normal and similar across groups. Pressure-dependent vasoconstriction averaged 72 ± 2% of baseline in sham rats, indicating intact autoregulatory behavior. Eight-day LPS-treated rats exhibited significantly impaired pressure-mediated vasoconstriction (96 ± 1% of baseline), whereas it was preserved in rats that received anti-TLR4 antibody (75 ± 3%), CAP (84 ± 2%), or tempol (82 ± 2%). Using a 14-day LPS (0.1 mg·kg-1·day-1 sq) intervention protocol, CAP treatment started on day 7, where autoregulatory behavior is already impaired. Systolic blood pressures were normal across all treatment groups. Fourteen-day LPS treatment retained the autoregulatory impairment (95 ± 2% of baseline). CAP intervention starting on day 7 rescued pressure-mediated vasoconstriction with diameters decreasing to 85 ± 1% of baseline. These data demonstrate that chronic subclinical TLR4 activation impairs afferent arteriolar autoregulatory behavior through mechanisms involving reactive oxygen species and major histocompatibility complex class II activation.


Assuntos
Antígenos de Histocompatibilidade Classe II/efeitos dos fármacos , Homeostase/efeitos dos fármacos , Lipopolissacarídeos/toxicidade , Circulação Renal/efeitos dos fármacos , Animais , Pressão Sanguínea/efeitos dos fármacos , Óxidos N-Cíclicos/farmacologia , Masculino , Néfrons/efeitos dos fármacos , Néfrons/metabolismo , Ratos , Ratos Sprague-Dawley , Espécies Reativas de Oxigênio/metabolismo , Marcadores de Spin , Receptor 4 Toll-Like/antagonistas & inibidores , Vasoconstrição/efeitos dos fármacos
17.
Am J Physiol Gastrointest Liver Physiol ; 316(1): G217-G227, 2019 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-30475062

RESUMO

This study aimed to establish mechanistic links between the prolonged intake of desloratadine, a common H1 receptor blocker (i.e., antihistamine), and development of obesity and metabolic syndrome. Male Sprague-Dawley rats were treated for 16 wk with desloratadine. We analyzed the dynamics of body weight gain, tissue fat accumulation/density, contractility of isolated mesenteric lymphatic vessels, and levels of blood lipids, glucose, and insulin, together with parameters of liver function. Prolonged intake of desloratadine induced development of an obesity-like phenotype and signs of metabolic syndrome. These alterations in the body included excessive weight gain, increased density of abdominal subcutaneous fat and intracapsular brown fat, high blood triglycerides with an indication of their rerouting toward portal blood, high HDL, high fasting blood glucose with normal fasting and nonfasting insulin levels (insulin resistance), high liver/body weight ratio, and liver steatosis (fatty liver). These changes were associated with dysfunction of mesenteric lymphatic vessels, specifically high lymphatic tone and resistance to flow together with diminished tonic and abolished phasic responses to increases in flow, (i.e., greatly diminished adaptive reserves to respond to postprandial increases in lymph flow). The role of nitric oxide in this flow-dependent adaptation was abolished, with remnants of these responses controlled by lymphatic vessel-derived histamine. Our current data, considered together with reports in the literature, support the notion that millions of the United States population are highly likely affected by underevaluated, lymphatic-related side effects of antihistamines and may develop obesity and metabolic syndrome due to the prolonged intake of this medication. NEW & NOTEWORTHY Prolonged intake of desloratadine induced development of obesity and metabolic syndrome associated with dysfunction of mesenteric lymphatic vessels, high lymphatic tone, and resistance to flow together with greatly diminished adaptive reserves to respond to postprandial increases in lymph flow. Data support the notion that millions of the USA population are highly likely affected by underevaluated, lymphatic-related side effects of antihistamines and may develop obesity and metabolic syndrome due to the prolonged intake of this medication.


Assuntos
Fígado Gorduroso/tratamento farmacológico , Loratadina/análogos & derivados , Vasos Linfáticos/efeitos dos fármacos , Síndrome Metabólica/etiologia , Obesidade/etiologia , Tecido Adiposo/efeitos dos fármacos , Tecido Adiposo/metabolismo , Animais , Fígado Gorduroso/complicações , Resistência à Insulina/fisiologia , Lipídeos/sangue , Loratadina/farmacologia , Vasos Linfáticos/metabolismo , Masculino , Ratos , Ratos Sprague-Dawley , Aumento de Peso/efeitos dos fármacos
18.
Parasitology ; 146(14): 1796-1802, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31452467

RESUMO

Leishmania rely heavily on glycans to complete their digenetic life cycle in both mammalian and phlebotomine sand fly hosts. Leishmania promastigotes secrete a proteophosphoglycan-rich gel (Promastigote Secretory Gel, PSG) that is regurgitated during transmission and can exacerbate infection in the skin. Here we explored the role of PSG from natural Leishmania-sand fly vector combinations by obtaining PSG from Leishmania (L.) major-infected Phlebotomus (P.) papatasi and P. duboscqi and L. tropica-infected P. arabicus. We found that, in addition to the vector's saliva, the PSG from L. major and L. tropica potently exacerbated cutaneous infection in BALB/c mice, improved the probability of developing a patent cutaneous lesion, parasite growth and the evolution of the lesion. Of note, the presence of PSG in the inoculum more than halved the prepatent period of cutaneous L. tropica infection from an average of 32 weeks to 13 weeks. In addition, L. major and L. tropica PSG extracted from the permissive experimental vector, Lutzomyia (Lu.) longipalpis, also exacerbated infections in mice. These results reinforce and extend the hypothesis that PSG is an important and evolutionarily conserved component of Leishmania infection that can be used to facilitate experimental infection for drug and vaccine screening.


Assuntos
Leishmania major/química , Leishmania tropica/química , Leishmaniose Cutânea/patologia , Proteínas de Membrana/administração & dosagem , Phlebotomus/parasitologia , Proteoglicanas/administração & dosagem , Proteínas de Protozoários/administração & dosagem , Pele/efeitos dos fármacos , Pele/patologia , Animais , Feminino , Leishmaniose Cutânea/parasitologia , Proteínas de Membrana/química , Camundongos , Camundongos Endogâmicos BALB C , Carga Parasitária , Proteoglicanas/química , Proteínas de Protozoários/química , Saliva , Pele/parasitologia , Exacerbação dos Sintomas
19.
Risk Anal ; 39(8): 1675-1694, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-30893483

RESUMO

Effective risk communication is an integral part of responding to terrorism, but until recently, there has been very little pre-event communication in a European context to provide advice to the public on how to protect themselves during an attack. Following terrorist attacks involving mass shootings in Paris, France, in November 2015, the U.K. National Police Chiefs' Council released a Stay Safe film and leaflet that advises the public to "run," "hide," and "tell" in the event of a firearms or weapons attack. However, other countries, including Denmark, do not provide preparedness information of this kind, in large part because of concern about scaring the public. In this survey experiment, 3,003 U.K. and Danish participants were randomly assigned to one of three conditions: no information, a leaflet intervention, and a film intervention to examine the impact of "Run, Hide, Tell" advice on perceptions about terrorism, the security services, and intended responses to a hypothetical terrorist firearms attack. Results demonstrate important benefits of pre-event communication in relation to enhancing trust, encouraging protective health behaviors, and discouraging potentially dangerous actions. However, these findings also suggest that future communications should address perceived response costs and target specific problem behaviors. Cross-national similarities in response suggest this advice is suitable for adaptation in other countries.

20.
Prev Med ; 112: 160-167, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-29673885

RESUMO

Unhealthy substance use is associated with increased rates of STDs, including HIV. Within three high-risk New York City (NYC) sexual health clinics between 2008 and 2012 (n = 146,657), 17% of patients screened positive for a current SUD but only 5.3% ever received prior treatment. The goal of Project Renew was to expand the reach of substance use early intervention services within and across sexual health clinics citywide and decrease substance use, poor mental health, and risky sexual behavior. To accomplish this goal, Screening, Brief Intervention, and Referral to Treatment (SBIRT), an evidence-based substance use early intervention model, was implemented in all eight NYC sexual health clinics February 2012-January 2015. Clinic patients were screened for substance misuse using the AUDIT/DAST-10, and those who screened positive were eligible for on-site brief intervention. Overall, 130,597 substance misuse screenings were conducted (66,989, or 51%, positive), and 17,474 on-site brief interventions and 1238 referrals were provided (not unique to individual patients). A 10% sample of 14,709 unique patients who screened positive were interviewed using a federal data collection tool at baseline and six months later to assess changes in substance use, sexual risk behaviors, mental health, and health status (n = 1328). At six-month follow-up, patients reported reduced substance use, less sexual activity, improved overall health, and fewer days of depression and anxiety compared to measures at baseline (p < 0.05). Based on positive results, Project Renew SBIRT services have been sustained, ensuring essential care which may help prevent acquisition of HIV/STDs among a large population of high-risk New Yorkers.


Assuntos
Instituições de Assistência Ambulatorial/organização & administração , Programas de Rastreamento/métodos , Avaliação de Processos e Resultados em Cuidados de Saúde , Saúde Sexual , Infecções Sexualmente Transmissíveis/prevenção & controle , Transtornos Relacionados ao Uso de Substâncias/terapia , Adulto , Alcoolismo , Feminino , Humanos , Masculino , Cidade de Nova Iorque/epidemiologia , Encaminhamento e Consulta , Fatores de Risco , Assunção de Riscos , Detecção do Abuso de Substâncias
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