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1.
Arch Sex Behav ; 2024 Aug 12.
Artículo en Inglés | MEDLINE | ID: mdl-39134736

RESUMEN

In addition to describing sexual partner preferences, sexual self-labels in gay and bisexual (henceforth, sexual minority) men, such as top, bottom, and versatile, are associated with psychological characteristics (e.g., gendered personality traits). No research has explored the association between sexual self-labels and eating and body image disturbances in sexual minority men. Research in sexual minority men from China is particularly valuable and needed due to recent rises in rates of eating and body image disturbances and unique, minority-specific stressors experienced by Chinese sexual minority populations. We adopted an online, cross-sectional study in a sample of sexual minority men from China (N = 403; tops, n = 256, bottoms, n = 95, versatiles, n = 52). Bottoms reported higher thinness internalization, lower muscularity internalization, higher body fat dissatisfaction, and higher psychological distress than tops. Bottoms' weight bias internalization was higher than tops' and versatiles' reports and, compared to versatiles, bottoms also reported higher psychosocial impairment related to eating disorder psychopathology. Compared to versatiles, tops reported higher drive for muscularity and muscularity-oriented disordered eating. Adjusting for age, psychological distress, and psychosocial impairment, tops reported higher muscularity internalization than bottoms and higher drive for muscularity and muscularity-oriented disordered eating than both bottoms and versatiles. Findings suggested unique relations between sexual self-labels and eating and body image disturbances in Chinese sexual minority men. Replication and validation of the temporal order between sexual self-labels and eating and body image disturbances is needed, including assessment of social factors (e.g., femmephobia, minority stress) that may help explain the links between sexual self-labels and eating pathology.

2.
J Clin Hypertens (Greenwich) ; 26(8): 955-963, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38952049

RESUMEN

The E-proteinoid 3 receptor (PTGER3), a member of the prostaglandin E2 (PGE2) subtype receptor, belongs to the G-protein-coupled superfamily of receptors. Animal studies have demonstrated its involvement in salt sensitivity by regulating sodium reabsorption. This study aimed to investigate the association between genetic variants of PTGER3 and salt sensitivity, longitudinal blood pressure (BP) changes, and the incidence of hypertension in Chinese adults. A chronic salt intake intervention was conducted involving 514 adults from 124 families in the 2004 Baoji Salt-Sensitivity Study Cohort in northern China. These participants followed a 3-day regular baseline diet, followed by a 7-day low-salt diet (3.0 g/d) and a 7-day high-salt diet (18 g/d), and were subsequently followed for 14 years. The findings revealed a significant relationship between the single nucleotide polymorphism (SNP) rs17482751 of PTGER3 and diastolic blood pressure (DBP) response to high salt intervention. Additionally, SNPs rs11209733, rs3765894, and rs2268062 were significantly associated with longitudinal changes in systolic blood pressure (SBP), DBP, and mean arterial pressure (MAP) during the 14-year follow-up period. SNP rs6424414 was significantly associated with longitudinal changes in DBP over 14 years. Finally, SNP rs17482751 showed a significant correlation with the incidence of hypertension over 14 years. These results emphasize the significant role of PTGER3 gene polymorphism in salt sensitivity, longitudinal BP changes, and the development of hypertension in the Chinese population.


Asunto(s)
Presión Sanguínea , Hipertensión , Polimorfismo de Nucleótido Simple , Subtipo EP3 de Receptores de Prostaglandina E , Cloruro de Sodio Dietético , Humanos , Hipertensión/genética , Hipertensión/epidemiología , Hipertensión/fisiopatología , Masculino , Femenino , China/epidemiología , Incidencia , Adulto , Persona de Mediana Edad , Presión Sanguínea/genética , Presión Sanguínea/fisiología , Cloruro de Sodio Dietético/efectos adversos , Subtipo EP3 de Receptores de Prostaglandina E/genética , Estudios Longitudinales , Pueblo Asiatico/genética , Dieta Hiposódica/métodos , Pueblos del Este de Asia
3.
J Org Chem ; 89(14): 10066-10076, 2024 Jul 19.
Artículo en Inglés | MEDLINE | ID: mdl-38953547

RESUMEN

An efficient [3 + 2] cycloaddition reaction between in situ generated nitrile imines from hydrazonoyl halides and vinylsulfonium salts is developed. The nitrile imines are demonstrated to be a new class of reaction partner for vinylsulfonium salts to conduct the [3 + 2] cycloaddition reaction. The process provides a concise and efficient method for the construction of pyrazole derivatives under mild reaction conditions with broad substrate scope, good product yields, and high regioselectivity.

4.
Ecotoxicol Environ Saf ; 282: 116710, 2024 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-39024953

RESUMEN

The adverse impacts of chronic hypoxia on maternal and infant health at high altitudes warrant significant attention. However, effective protective measures against the resultant growth restrictions and neurodevelopmental disorders in infants and young children are still lacking. This study investigated the neurodevelopment of mice offspring under hypoxic conditions by exposing pregnant mice to a hypobaric oxygen chamber that simulated the hypobaric hypoxia at an altitude of 4000 m until 28 days after delivery. Our findings suggested that prolonged exposure to hypoxia might result in emotional abnormalities and social disorders in offspring. The significant reduction in astrogliogenesis was a characteristic feature associated with neurodevelopmental disorders induced by hypoxia. Further studies demonstrated that cold-induced RNA-binding protein (CIRBP) was a key transcriptional regulator in astrogliogenesis, which downregulated astrocytic differentiation under hypoxia through its crosstalk with the NFIA. Our study emphasized the crucial role of CIRBP in regulating astrogliogenesis and highlighted its potential as a promising target for therapeutic interventions in neurodevelopmental disorders associated with hypoxia.


Asunto(s)
Astrocitos , Regulación hacia Abajo , Hipoxia , Proteínas de Unión al ARN , Animales , Proteínas de Unión al ARN/genética , Proteínas de Unión al ARN/metabolismo , Ratones , Femenino , Embarazo , Diferenciación Celular , Altitud , Trastornos del Neurodesarrollo , Ratones Endogámicos C57BL , Masculino , Factores de Transcripción NFI
5.
Eur J Neurol ; 31(9): e16377, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38863307

RESUMEN

BACKGROUND AND PURPOSE: We aimed to characterize hypothalamic involvement in myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) and compare it with neuromyelitis optica spectrum disorder (NMOSD) and multiple sclerosis (MS). METHODS: A retrospective study was performed to identify hypothalamic lesions in patients diagnosed with MOGAD, NMOSD, or MS from January 2013 to May 2020. The demographic, clinical, and radiological features were recorded. Hypothalamic dysfunction and prognosis were assessed through physical examination, biochemical testing, sleep monitoring, and magnetic resonance imaging. RESULTS: Hypothalamic lesions were observed in seven of 96 patients (7.3%) with MOGAD, 34 of 536 (6.3%) with NMOSD, and 16 of 356 (4.5%) with MS (p = 0.407). The time from disease onset to development of hypothalamic lesions was shortest in MOGAD (12 months). The frequency of bilateral hypothalamic lesions was the lowest in MOGAD (p = 0.008). The rate of hypothalamic dysfunction in MOGAD was 28.6%, which was lower than that in NMOSD (70.6%) but greater than that in MS patients (18.8%; p = 0.095 and p = 0.349, respectively). Hypothalamic dysfunction in MOGAD manifests as hypothalamic-pituitary-adrenal axis dysfunction and hypersomnia. The proportion of complete regression of hypothalamic lesions in MOGAD (100%) was much greater than that in NMOSD (41.7%) and MS patients (18.2%; p = 0.007 and p = 0.001, respectively). An improvement in hypothalamic dysfunction was observed in all MOGAD patients after immunotherapy. CONCLUSIONS: MOGAD patients have a relatively high incidence of asymptomatic hypothalamic lesions. The overall prognosis of patients with hypothalamic involvement is good in MOGAD, as the lesions completely resolve, and dysfunction improves after immunotherapy.


Asunto(s)
Hipotálamo , Esclerosis Múltiple , Glicoproteína Mielina-Oligodendrócito , Neuromielitis Óptica , Humanos , Neuromielitis Óptica/inmunología , Neuromielitis Óptica/diagnóstico por imagen , Neuromielitis Óptica/patología , Femenino , Masculino , Glicoproteína Mielina-Oligodendrócito/inmunología , Adulto , Hipotálamo/diagnóstico por imagen , Hipotálamo/patología , Estudios Retrospectivos , Persona de Mediana Edad , Esclerosis Múltiple/inmunología , Esclerosis Múltiple/diagnóstico por imagen , Esclerosis Múltiple/patología , Adulto Joven , Adolescente , Autoanticuerpos/sangre , Autoanticuerpos/inmunología , Enfermedades Hipotalámicas/complicaciones , Niño , Imagen por Resonancia Magnética
6.
Surg Radiol Anat ; 46(7): 1131-1136, 2024 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-38717500

RESUMEN

OBJECTIVE: The purpose of this study was to present the classification of navicular bones and the anatomical basis for the diagnosis and treatment of navicular fractures of the foot. METHOD: 351 computed tomographic (CT) images of the navicular bone were analyzed and classified. The navicular bone's anatomical morphology was measured by three independent researchers in each type. Analysis and recording of the measurement results followed. RESULT: Navicular bones were assorted into three types: I shape(37.04%), II shape(54.41%), and III shape(8.55%). The left and right sides did not differ in any appreciable ways, except ab, bc, and ∠abc (P < 0.05); And all data were statistically different between men and women except for ∠abc (p > 0.05). CONCLUSION: The classification of the navicular bone in this study may be helpful in making the treatment decision for navicular fracture. LEVEL OF CLINICAL EVIDENCE: 4.


Asunto(s)
Fracturas Óseas , Huesos Tarsianos , Tomografía Computarizada por Rayos X , Humanos , Huesos Tarsianos/diagnóstico por imagen , Huesos Tarsianos/anatomía & histología , Masculino , Femenino , Adulto , Persona de Mediana Edad , Fracturas Óseas/diagnóstico por imagen , Fracturas Óseas/clasificación , Adulto Joven , Anciano , Adolescente , Variación Anatómica
7.
Int J Biol Macromol ; 271(Pt 1): 132616, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38795885

RESUMEN

Effective EPR and tumor penetration are bottlenecks in current nanomedicine therapy. Comosol software was utilized to analyze the motion process of nanoparticles (NPs) with different shapes, from blood vessels to tumor tissue, to address this. By calculation, urchin-like NPs experienced higher drag forces than spherical NPs, facilitating their EPR and tumor penetration effects. Thus, urchin-like indocyanine green-loaded hydroxyethyl starch-cholesterol (ICG@HES-CH) NPs were prepared by leveraging the instability of ICG responding to near-infrared light (NIR). Upon NIR exposure, ICG degraded and partly disintegrated ICG@HES-CH NPs, and its morphology transformed from spherical to urchin-like. Vincristine (VC), as a model drug, was loaded in urchin-like ICG@HES-CH NPs for the treatment of lymphoma. A20 lymphoma cells and 3T3-A20 tumor organoids were employed to investigate the influence of shape on NPs' cellular uptake, penetration pathway, and cytotoxicity. It demonstrated that urchin-like ICG@HES-CH NPs mainly transport across the extracellular matrix through intercellular pathways, easily reaching the deep tumor sites and achieving higher cytotoxicity. In vivo VC distribution and anti-tumor results indicated that urchin-like NPs increased VC EPR and penetration ability, lowering VC neurotoxicity and superior anti-tumor effect. Therefore, urchin-like ICG@HES-CH NPs have great translational potential to be used as chemotherapeutic nanocarriers in anticancer therapy.


Asunto(s)
Portadores de Fármacos , Derivados de Hidroxietil Almidón , Verde de Indocianina , Nanopartículas , Verde de Indocianina/química , Verde de Indocianina/farmacología , Animales , Nanopartículas/química , Ratones , Portadores de Fármacos/química , Línea Celular Tumoral , Derivados de Hidroxietil Almidón/química , Derivados de Hidroxietil Almidón/farmacología , Vincristina/farmacología , Vincristina/química , Humanos
8.
Front Nutr ; 11: 1366843, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38567253

RESUMEN

Background: Metabolically Associated Fatty Liver Disease (MAFLD) marks a progression from the previous paradigm of Non-Alcoholic Fatty Liver Disease (NAFLD), presenting a redefined diagnostic framework that accentuates metabolic factors while recognizing non-alcoholic contributors. In our investigation, our principal aim was to scrutinize the conceivable correlation between diverse serum folate levels and the prevalence of MAFLD and liver fibrosis. Methods: In our investigation, we conducted an extensive analysis utilizing data derived from the National Health and Nutrition Examination Survey (NHANES) across the years 2017-2020. We aimed to investigate the association between different serum folate concentrations and the prevalence of MAFLD and liver fibrosis by comprehensive multivariate analysis. This analytical approach considered various variables, encompassing sociodemographic characteristics, lifestyle factors, hypertension, and diabetes. By including these potential confounders in our analysis, we aimed to ensure the stability of the findings regarding the association between different serum folate concentrations and the development of MAFLD and liver fibrosis. Results: In our investigation, we utilized multiple linear regression models to thoroughly analyze the data, revealing noteworthy insights. Evidently, elevated levels of both total folate and 5-MTHF exhibited a distinct negative correlation with CAP, while 5-MTHF demonstrated a notable negative correlation with LSM. Furthermore, multiple logistic regression models were employed for an in-depth examination of the data. As the concentrations of total folate and 5-MTHF in the serum increased, a substantial decrease in the likelihood of MAFLD and liver fibrosis occurrence was observed. Conclusion: The findings of this investigation robustly suggest the prevalence of MAFLD and liver fibrosis decreased significantly with the increase of serum concentrations of total folate and 5-MTHF.

9.
BMC Infect Dis ; 24(1): 421, 2024 Apr 22.
Artículo en Inglés | MEDLINE | ID: mdl-38644471

RESUMEN

BACKGROUND: There are few thorough studies assessing predictors of severe encephalitis, despite the poor prognosis and high mortality associated with severe encephalitis. The study aims to evaluate the clinical predictors of mortality and poor outcomes at hospital discharge in patients with severe infectious encephalitis in intensive care units. METHOD: In two Chinese hospitals, a retrospective cohort study comprising 209 patients in intensive care units suffering from severe infectious encephalitis was carried out. Univariate and multivariate logistic regression analyses were used to identify the factors predicting mortality in all patients and poor outcomes in all survivors with severe infectious encephalitis. RESULTS: In our cohort of 209 patients with severe encephalitis, 22 patients died, yielding a mortality rate of 10.5%. Cerebrospinal fluid pressure ≥ 400mmH2O (OR = 7.43), abnormal imaging (OR = 3.51), abnormal electroencephalogram (OR = 7.14), and number of rescues (OR = 1.12) were significantly associated with an increased risk of mortality in severe infectious encephalitis patients. Among the 187 survivors, 122 (65.2%) had favorable outcomes, defined as the modified Rankine Scale (mRS) score (0 ~ 3), and 65(34.8%) had poor outcomes (mRS scores 4 ~ 5). Age (OR = 1.02), number of rescues (OR = 1.43), and tubercular infection (OR = 10.77) were independent factors associated with poor outcomes at discharge in all survivors with severe infectious encephalitis. CONCLUSIONS: Multiple clinical, radiologic, and electrophysiological variables are independent predictive indicators for mortality and poor outcomes in patients with severe encephalitis in intensive care units. Identifying these outcome predictors early in patients with severe encephalitis may enable the implementation of appropriate medical treatment and help reduce mortality rates.


Asunto(s)
Unidades de Cuidados Intensivos , Humanos , Femenino , Masculino , Unidades de Cuidados Intensivos/estadística & datos numéricos , Estudios Retrospectivos , Persona de Mediana Edad , Estudios Transversales , Adulto , Pronóstico , Encefalitis Infecciosa/mortalidad , Anciano , China/epidemiología , Adulto Joven , Adolescente , Factores de Riesgo , Resultado del Tratamiento
10.
Cell Death Differ ; 31(4): 524-539, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38388728

RESUMEN

Cold-inducible RNA binding protein (CIRBP), a stress response protein, protects cells from mild hypothermia or hypoxia by stabilizing specific mRNAs and promoting their translation. Neurons subjected to hypobaric hypoxia insult trigger various cell death programs. One of these is ferroptosis, a novel non-apoptotic form of programmed cell death, which is characterized by excessive iron ion accumulation and lipid peroxidation. Here, we establish that CIRBP can regulate neuronal ferroptosis both in vivo and in vitro. We observe that hypoxia leads to neuronal death via intracellular ferrous iron overload and impaired antioxidant systems, accompanied by suppressed CIRBP expression. Genetic enrichment of CIRBP in hippocampal neurons CIRBPTg mice bred with Emx1-Cre mice attenuates hypoxia-induced cognitive deficits and neuronal degeneration. Mechanistically, CIRBP alleviates neuronal ferroptosis and intracellular ferrous ion accumulation by binding to the mitochondrial ferritin (FTMT) 3'UTR to stabilize mRNA and promote its translation. Our novel study shows the critical role of CIRBP in the progression of ferroptosis, and provides promising therapeutic target for hypoxia-induced neurological diseases.


Asunto(s)
Ferroptosis , Sobrecarga de Hierro , Neuronas , Proteínas de Unión al ARN , Animales , Proteínas de Unión al ARN/metabolismo , Proteínas de Unión al ARN/genética , Ratones , Neuronas/metabolismo , Neuronas/patología , Sobrecarga de Hierro/metabolismo , Sobrecarga de Hierro/patología , Hipoxia/metabolismo , Ratones Endogámicos C57BL , Hipocampo/metabolismo , Hipocampo/patología , Hierro/metabolismo , Humanos
11.
Cancer Commun (Lond) ; 44(3): 408-432, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38407943

RESUMEN

BACKGROUND: Chimeric antigen receptor T (CAR-T) therapy has substantially revolutionized the clinical outcomes of patients with hematologic malignancies, but the cancer-intrinsic mechanisms underlying resistance to CAR-T cells remain yet to be fully understood. This study aims to explore the molecular determinants of cancer cell sensitivity to CAR-T cell-mediated killing and to provide a better understanding of the underlying mechanisms and potential modulation to improve clinical efficacy. METHODS: The human whole-genome CRISPR/Cas9-based knockout screening was conducted to identify key genes that enable cancer cells to evade CD19 CAR-T-cell-mediated killing. The in vitro cytotoxicity assays and evaluation of tumor tissue and bone marrow specimens were further conducted to confirm the role of the key genes in cancer cell susceptibility to CAR-T cells. In addition, the specific mechanisms influencing CAR-T cell-mediated cancer clearance were elucidated in mouse and cellular models. RESULTS: The CRISPR/Cas9-based knockout screening showed that the enrichment of autophagy-related genes (ATG3, BECN1, and RB1CC1) provided protection of cancer cells from CD19 CAR-T cell-mediated cytotoxicity. These findings were further validated by in vitro cytotoxicity assays in cells with genetic and pharmacological inhibition of autophagy. Notably, higher expression of the three autophagy-related proteins in tumor samples was correlated with poorer responsiveness and worse survival in patients with relapsed/refractory B-cell lymphoma after CD19 CAR-T therapy. Bulk RNA sequencing analysis of bone marrow samples from B-cell leukemia patients also suggested the clinical relevance of autophagy to the therapeutic response and relapse after CD19 CAR-T cell therapy. Pharmacological inhibition of autophagy and knockout of RB1CC1 could dramatically sensitize tumor cells to CD19 CAR-T cell-mediated killing in mouse models of both B-cell leukemia and lymphoma. Moreover, our study revealed that cancer-intrinsic autophagy mediates evasion of CAR-T cells via the TNF-α-TNFR1 axis-mediated apoptosis and STAT1/IRF1-induced chemokine signaling activation. CONCLUSIONS: These findings confirm that autophagy signaling in B-cell malignancies is essential for the effective cytotoxic function of CAR-T cells and thereby pave the way for the development of autophagy-targeting strategies to improve the clinical efficacy of CAR-T cell immunotherapy.


Asunto(s)
Leucemia de Células B , Leucemia Linfocítica Crónica de Células B , Receptores Quiméricos de Antígenos , Humanos , Ratones , Animales , Linfocitos T , Inmunoterapia , Autofagia/genética
12.
Cell Res ; 34(2): 124-139, 2024 02.
Artículo en Inglés | MEDLINE | ID: mdl-38168640

RESUMEN

Achieving uniform optical resolution for a large tissue sample is a major challenge for deep imaging. For conventional tissue clearing methods, loss of resolution and quality in deep regions is inevitable due to limited transparency. Here we describe the Transparent Embedding Solvent System (TESOS) method, which combines tissue clearing, transparent embedding, sectioning and block-face imaging. We used TESOS to acquire volumetric images of uniform resolution for an adult mouse whole-body sample. The TESOS method is highly versatile and can be combined with different microscopy systems to achieve uniformly high resolution. With a light sheet microscope, we imaged the whole body of an adult mouse, including skin, at a uniform 0.8 × 0.8 × 3.5 µm3 voxel resolution within 120 h. With a confocal microscope and a 40×/1.3 numerical aperture objective, we achieved a uniform sub-micron resolution in the whole sample to reveal a complete projection of individual nerve axons within the central or peripheral nervous system. Furthermore, TESOS allowed the first mesoscale connectome mapping of individual sensory neuron axons spanning 5 cm from adult mouse digits to the spinal cord at a uniform sub-micron resolution.


Asunto(s)
Axones , Imagenología Tridimensional , Ratones , Animales , Solventes , Imagenología Tridimensional/métodos , Médula Espinal , Sistema Nervioso Periférico
13.
Mult Scler Relat Disord ; 82: 105405, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38194895

RESUMEN

BACKGROUND: There is an age-dependent change in the clinical phenotype of Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD). However, the clinical features of late-onset MOGAD have not been well described. METHODS: Clinical data of 110 MOGAD patients, including 21 late-onset patients with onset age greater than or equal to 50 years old were retrospectively analyzed. RESULTS: Compared to pediatric- and younger adult-onset ones, late-onset MOGAD patients experienced milder disease onset (p < 0.001), more monophasic course (p < 0.001), fewer relapses (p = 0.007), less cerebrospinal fluid leukocytosis (p = 0.021), less longitudinally extensive transverse myelitis (onset p = 0.026, whole course p = 0.028), fewer lesions in basal ganglia (whole course p = 0.012), thalamus (whole course p = 0.040) and cerebellum (whole course p = 0.028). However, they had more cerebral symptoms (p = 0.021 onset and whole course), more lesions in white matter (onset p = 0.005, whole course p < 0.001) and periventricular area (onset p = 0.026), along with longer and delayed therapeutic intervention (p < 0.001). The main differences in clinical characteristics between late-onset patients with and without these brain involvements might be comorbidities. CONCLUSIONS: Late-onset MOGAD are more likely to experience delayed diagnosis. Brain involvement may be modulated by comorbidities of the elderly, which alter the clinical manifestations of late-onset MOGAD.


Asunto(s)
Ganglios Basales , Neuromielitis Óptica , Adulto , Anciano , Humanos , Niño , Glicoproteína Mielina-Oligodendrócito , Estudios Retrospectivos , Encéfalo/diagnóstico por imagen , Cerebelo , Autoanticuerpos , Acuaporina 4
14.
Biochem Biophys Res Commun ; 696: 149493, 2024 Feb 12.
Artículo en Inglés | MEDLINE | ID: mdl-38219486

RESUMEN

Brown fat adipose tissue (BAT) is a therapeutic potential target to improve obesity, diabetes and cold acclimation in mammals. During the long-term cold exposure, the hyperplastic sympathetic network is crucial for BAT the maintain the highly thermogenic status. It has been proved that the sympathetic nervous drives the thermogenic activity of BAT via the release of norepinephrine. However, it is still unclear that how the thermogenic BAT affects the remodeling of the hyperplastic sympathetic network, especially during the long-term cold exposure. Here, we showed that following long-term cold exposure, SCD1-mediated monounsaturated fatty acid biosynthesis pathway was enriched, and the ratios of monounsaturated/saturated fatty acids were significantly up-regulated in BAT. And SCD1-deficiency in BAT decreased the capacity of cold acclimation, and suppressed long-term cold mediated BAT thermogenic activation. Furthermore, by using thermoneutral exposure and sympathetic nerve excision models, we disclosed that SCD1-deficiency in BAT affected the thermogenic activity, depended on sympathetic nerve. In mechanism, SCD1-deficiency resulted in the unbalanced ratio of palmitic acid (PA)/palmitoleic acid (PO), with obviously higher level of PA and lower level of PO. And PO supplement efficiently reversed the inhibitory role of SCD1-deficiency on BAT thermogenesis and the hyperplastic sympathetic network. Thus, our data provided insight into the role of SCD1-mediated monounsaturated fatty acids metabolism to the interaction between thermogenic activity BAT and hyperplastic sympathetic networks, and illustrated the critical role of monounsaturated fatty acids biosynthetic pathway in cold acclimation during the long-term cold exposure.


Asunto(s)
Tejido Adiposo Pardo , Termogénesis , Animales , Tejido Adiposo Pardo/metabolismo , Termogénesis/fisiología , Sistema Nervioso Simpático , Obesidad/metabolismo , Ácidos Grasos Monoinsaturados/metabolismo , Frío , Mamíferos
15.
Nat Commun ; 15(1): 890, 2024 Jan 30.
Artículo en Inglés | MEDLINE | ID: mdl-38291059

RESUMEN

Type 2 diabetes (T2D)-related fragility fractures represent an increasingly tough medical challenge, and the current treatment options are limited. Mechanical loading is essential for maintaining bone integrity, although bone mechano-responsiveness in T2D remains poorly characterized. Herein, we report that exogenous cyclic loading-induced improvements in bone architecture and strength are compromised in both genetically spontaneous and experimentally-induced T2D mice. T2D-induced reduction in bone mechano-responsiveness is directly associated with the weakened Ca2+ oscillatory dynamics of osteocytes, although not those of osteoblasts, which is dependent on PPARα-mediated specific reduction in osteocytic SERCA2 pump expression. Treatment with the SERCA2 agonist istaroxime was demonstrated to improve T2D bone mechano-responsiveness by rescuing osteocyte Ca2+ dynamics and the associated regulation of osteoblasts and osteoclasts. Moreover, T2D-induced deterioration of bone mechano-responsiveness is blunted in mice with osteocytic SERCA2 overexpression. Collectively, our study provides mechanistic insights into T2D-mediated deterioration of bone mechano-responsiveness and identifies a promising countermeasure against T2D-associated fragility fractures.


Asunto(s)
Diabetes Mellitus Tipo 2 , Osteocitos , Animales , Ratones , Huesos , Calcio/metabolismo , Diabetes Mellitus Tipo 2/metabolismo , Osteoblastos/metabolismo , Osteocitos/metabolismo
16.
Environ Pollut ; 344: 123255, 2024 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-38159631

RESUMEN

The toxic effects of excessive manganese (Mn) levels in the environment have led to a severe public health concern. Ferroptosis is a newly form of cell death relying on iron, inherent to pathophysiological processes of psychiatric disorders, such as anxiety and depression-like behaviors. Excessive Mn exposure causes various neurological effects, including neuronal death and mood disorders. Whether Mn exposure causes anxiety and depression-like behaviors, and the underlying mechanisms of Mn-induced ferroptosis have yet to be determined. Here, Mn-exposed mice showed anxiety-like behavior. We also confirmed the accumulation of ferrous ion (Fe2+), lipid peroxidation, and depletion of antioxidant defense system both in vitro and in vivo Mn-exposed models, suggesting that Mn exposure can induce ferroptosis. Furthermore, Mn exposure downregulated the expression of miR-125b-2-3p. In turn, overexpression of miR-125b-2-3p alleviated the Mn-induced ferroptosis by targeting Transferrin receptor protein 1 (TFR1). In summary, this novel study established the propensity of Mn to cause anxiety-like behavior, an effect that was regulated by miR-125b-2-3p and ensuing ferroptosis secondary to the targeting of TFR1. These results offer promising targets for the prevention and treatment of Mn-induced neurotoxicity.


Asunto(s)
Ferroptosis , MicroARNs , Humanos , Animales , Ratones , Manganeso/toxicidad , Ansiedad/inducido químicamente , Hierro/toxicidad , Receptores de Transferrina/genética
17.
MedicalExpress (São Paulo, Online) ; 4(2): M170201, Mar.-Apr. 2017. tab, graf
Artículo en Inglés | LILACS | ID: biblio-841479

RESUMEN

PURPOSE: To systematically evaluate whether oral steroids can be used with the same efficacy and safety in comparison with the intravenous regimen for treatment of multiple sclerosis relapses. METHOD: We searched Medline, Embase and Cochrane Library and systematically reviewed articles comparing outcomes of oral versus intravenous steroids for acute relapses in patients with a clinically definite diagnosis of multiple sclerosis. RESULTS: Six articles with 414 participants in total were analyzed. Five of the included trials reported the proportion of patients experiencing improvement in Expanded Disability Status Scale after receiving either oral or intravenous methylprednisolone treatment at four weeks; the pooled results showed that there was no statistically significant difference (OR 0.96; 95% CI 0.60, 1.54; p=0.86) between treatments. Three trials reported the detailed results of adverse events, indicating the two treatments appear to be equally safe. Two trials revealed that there was no significant difference in gadolinium enhancement activity on magnetic resonance imaging. One trial showed that the mean area under the concentration-time curve (AUC) at 24 and 48 hours did not differ between groups. CONCLUSION: No significant differences were found in terms of clinical (benefits and adverse events), radiological and pharmacological outcomes in multiple sclerosis relapses in patients after oral or intravenous steroids treatment. Our meta-analysis provides evidence that oral steroid therapy is not inferior to intravenous steroid therapy. Thus oral administration may be a favorable substitute for intravenous medication of multiple sclerosis relapses.


PROPÓSITO: Avaliar de forma sistemática se esteroides orais podem ser utilizados com a mesma eficácia e segurança em comparação com o regime intravenoso para o tratamento de recaídas da esclerose múltipla (MS). MÉTODO: Foram pesquisados Medline, Embase e Cochrane Library e sistematicamente revistos artigos comparando resultados de esteroides orais versus intravenosos para recaídas agudas em pacientes com diagnóstico de esclerose múltipla clinicamente definida. RESULTADOS: Seis artigos com 414 participantes no total foram analisados. Cinco dos estudos incluídos relataram a proporção de doentes com melhoria através de "Expanded Disability Status Scale" depois de receber um ou outro tratamento: metilprednisolona oral ou intravenosa por quatro semanas. Os resultados combinados mostraram que não houve diferença estatisticamente significativa (OR 0,96; 95% 101 0,60, 1,54 ; p = 0,86). Três estudos mostraram os resultados detalhados de eventos adversos, indicando que os dois tratamentos parecem ser igualmente seguros. Dois ensaios revelaram que não havia nenhuma diferença significativa no aumento de atividade de gadolínio via imagens por ressonância magnética. Um estudo mostrou que a área média sob as curvas de concentração-tempo (AUC) às 24 horas e 48 horas não diferiram entre os grupos. CONCLUSÃO: Não foram encontradas diferenças significativas em termos de clínicos (benefícios e eventos adversos) ou nos resultados radiológicos e farmacológicos em pacientes pós-esteroides por via oral ou intravenosa no tratamento de várias recaídas de esclerose. Nossa metanálise fornece evidências de que a terapia com esteroides por via oral não é inferior à terapia com esteroides por via intravenosa. Assim, a administração oral pode ser um substituto favorável para medicação intravenosa de recidivas da esclerose múltipla.


Asunto(s)
Humanos , Esteroides/administración & dosificación , Esclerosis Múltiple/tratamiento farmacológico , Recurrencia , Metilprednisolona/administración & dosificación , Administración Oral , Administración Intravenosa
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