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#28951710   2017/09/27 Save this To Up

Brain-derived neurotrophic factor is increased in serum levels of patients with symptomatic dermographism.

Symptomatic dermographism (SD) is the most common form of physical urticaria. However, the role of neuroimmune mechanisms in SD is unclear.

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#28939187   2017/09/23 Save this To Up

The ameliorative effects and underlying mechanisms of dopamine D1-like receptor agonist SKF38393 on Aβ1-42-induced cognitive impairment.

Alzheimer's disease (AD) is an age-related neurodegenerative disease characterized by extracellular amyloid plaques and intracellular neurofibrillary tangles. It is the most common form of human cognitive decline and dementia. In this study, we aim to systematically investigate the ameliorative effects of dopamine D1-like receptor agonist SKF38393 on cognitive dysfunction and explore its underlying mechanisms. The Aβ1-42 was injected intracerebroventricularly to establish cognitive disorder model. Then, a series of behavior tests were used. In order to further study the mechanisms, some relevant protein was assessed by ELISA method and Western blot. The results in behavior tests revealed that SKF38393 significantly ameliorated all the test indexes compared with the model mice. Then SKF38393 increased phosphorylation of cAMP response element binding protein (CREB) and expression of Bcl-2 in Western blot analyses. Furthermore, in ELISA assay, SKF38393 significantly increased the brain-derived neurotrophic factor (BDNF) levels and reduced the β-site APP cleaving enzyme1 (BACE1) and Aβ1-42 levels in hippocampus and cortex of mice. However, compared with SKF38393-H, all these results were significantly reversed by the dopamine D1 receptor antagonist SCH23390. These results indicated that SKF38393 could ameliorate Aβ1-42-induced cognitive dysfunction in mice, which may be related to D1 receptor activation. It leads to the phosphorylation of CREB, which promote the expression of BDNF, Bcl-2 and decrease the expression of Aβ1-42 of mice. Our findings suggest that dopamine D1-like receptor may be a potential target for the treatment of AD and its agonists may become a novel drug in the future.

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#28800782   2017/08/12 Save this To Up

Effects of Chinese medicinal herbs on expression of brain-derived Neurotrophic factor (BDNF) and its interaction with human breast cancer MDA-MB-231 cells and endothelial HUVECs.

Our previous study demonstrated that an up-regulation of the Brain-Derived Neurotrophic Factor (BDNF) signaling pathway is involved the mechanism causing the recurrence of triple negative breast cancer. The aim of this study is to investigate the effects of commonly used Chinese medicinal herbs on MDA-MB-231 and HUVEC cells and how they interact with BDNF.

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#28798775   2017/08/11 Save this To Up

Maintenance of a Schwann-Like Phenotype in Differentiated Adipose-Derived Stem Cells Requires the Synergistic Action of Multiple Growth Factors.

Differentiating human adipose-derived stem cells (ASCs) towards Schwann cells produces an unstable phenotype when stimulating factors are withdrawn. Here, we set out to examine the role of glial growth factor 2 (GGF-2) in the maintenance of Schwann-like cells. Following ASC differentiation to Schwann-like cells, stimulating factors were withdrawn such that cells either remained in media supplemented with all stimulating factors, GGF-2 alone, or underwent complete withdrawal of all factors. Furthermore, each stimulating factor was also removed from the growth medium individually. At 72 hours, gene (qRT-PCR) and protein (ELISA) expression of key Schwann cell factors were quantified and cell morphology was analysed. Cells treated with GGF-2 alone reverted to a stem cell morphology and did not stimulate the production of brain-derived neurotrophic factor (BDNF), regardless of the concentration of GGF-2 in the growth medium. However, GGF-2 alone increased the expression of Krox20, the main transcription factor involved in myelination, relative to those cells treated with all stimulating factors. Cells lacking fibroblast growth factor were unable to maintain a Schwann-like morphology, and those lacking forskolin exhibited a downregulation in BDNF production. Therefore, it is likely that the synergistic action of multiple growth factors is required to maintain Schwann-like phenotype in differentiated ASCs.

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#28754344   2017/07/29 Save this To Up

The effect of childhood trauma on serum BDNF in bipolar depression is modulated by the serotonin promoter genotype.

In healthy humans, both childhood trauma and the short form of the serotonin promoter transporter genotype (5-HTTLPR) are associated with lower levels of brain-derived neurotrophic factor (BDNF). In subjects with bipolar disorder (BD), lower levels of BDNF and a higher degree of childhood trauma were observed compared with healthy controls. However, is still unknown if the functional 5-HTTLPR polymorphisms exerts an effect on both abnormalities. In 40 inpatients affected by a major depressive episode in the course of BD, we genotyped 5-HTTLPR, measured serum BDNF with ELISA, and assessed early adversities by the childhood trauma questionnaire (CTQ). Data were analyzed in the context of the general linear model correcting for age, sex, ongoing lithium treatment, severity of current depression, and CTQ minimization/denial scores to investigate the effect of 5-HTTLPR polymorphism and childhood trauma on BDNF levels. Early trauma were negatively associated with BDNF serum levels (higher CTQ scores, lower BDNF; p=0.0019). 5-HTTLPR l/l homozygotes showed significantly higher BDNF levels than 5-HTTLPR*s carriers (30.57±6.13 vs 26.82±6.41; p=0.0309). A separate-slopes analysis showed that 5-HTTLPR significantly influenced the relationship between early trauma and adult BDNF (interaction of 5-HTTLPR with CTQ scores: p=0.0023), due to a significant relationship between trauma and BDNF in 5-HTTLPR*s carriers, but not among l/l homozygotes. Putatively detrimental effects of childhood trauma exposure on adult BDNF serum levels are influenced by 5-HTTLPR genotype in patients affected by BD. Possible mechanisms include epigenetic modulation of BDNF gene expression, due to different reactivity to stressors in 5-HTTLPR genotype groups.

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#28700015   2017/07/12 Save this To Up

Telomere length and hTERT in mania and subsequent remission.

The findings of telomere length (TL) studies in bipolar disorder (BD) are controversial. The aim of the present study was to detect TL, human telomerase reverse transcriptase (hTERT), and brain derived neurotrophic factor (BDNF) in severe mania and subsequent remission.

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#28678563   2017/07/05 Save this To Up

Effect of brain-derived neurotrophic factor (BDNF) on sperm quality of normozoospermic men.

The neurotrophin family of proteins and their receptors act as important proliferative and pro-survival factors in differentiation of nerve cells and are thought to play key roles in the development of reproductive tissues and normal function of spermatozoa. The objective of the present study was to evaluate the effect of Brain-Derived Neurotrophic Factor (BDNF) on the sperm viability and motility, lipid peroxidation (LPO), mitochondrial activity and concentration of leptin, nitric oxide (NO) and insulin in normozoospermic men. Semen samples from 20 normozoospermic men were divided into three groups: (i) control, (ii) BDNF and (iii) BDNF + K252a. BDNF and K252a were added in the dose of 0.133 and 0.1 nM, respectively. Viability was assessed by eosin-nigrosin staining technique, and motility was observed by microscopy. NO concentration and mitochondrial activity were measured with flow cytometry, and LPO was analyzed using enzyme-linked immunosorbent assay (ELISA) kits. Results showed that exogenous BDNF at 0.133 nM could significantly (p < 0.05) influence viability, motility, NO concentration, mitochondrial activity and LPO content. Secretions of insulin and leptin by human sperm were increased in cells exposed to the exogenous BDNF, whereas viability, mitochondrial activity and insulin and leptin secretions were decreased in cells exposed to the K252.

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#28455697   2017/04/29 Save this To Up

The Differentiation of Skin Mesenchymal Stem Cells Towards a Schwann Cell Phenotype: Impact of Sigma-1 Receptor Activation.

Neural crest stem cells (NCSCs) are the source of mature Schwann cells in the peripheral nervous system (PNS). The NCSC population resides in the bulge of hair follicles and in the dermis. Recently, it was shown that 2-3% of the human dermis mesenchymal stem cell (MSC) population expresses the NCSC marker CD271, thus enabling the use of skin MSCs for studying Schwann cell differentiation in vitro. The aims of this study were to establish a protocol for human skin MSC differentiation towards Schwann cell-like cells (SC-lcs) and to analyse the expression of sigma-1 receptor (S1R) in SC-lcs. The impact of S1R ligands, namely the selective agonist PRE-084, the positive allosteric modulator E1R and the selective antagonist NE-100, on Schwann cell differentiation was assessed. The expression of the neuron-specific genes Tubulin-βIII and Integrin-6α, the Schwann cell-specific gene S100b, MBP and the NCSC-specific genes p75NTR, Sox10, Notch1, Integrin-4α, Ap2α and Pax6 was analysed in MSCs and SC-lcs by real-time RT-PCR. BDNF secretion was evaluated by ELISA. The effect of S1R ligands on SC-lc differentiation was measured using BDNF ELISA and MBP flow cytometry. After MSC differentiation, NCSC markers p75NTR and Integrin-4α were downregulated 3.5-fold and 2-fold, respectively. To the contrary, MBP and S100b were significantly upregulated in SC-lcs. S1R ligands showed a tendency to increase the secretion of BDNF by the SC-lc population. PRE-084 and E1R increased MBP expression in the SC-lc population, whereas 3 μM NE-100 inhibited MBP expression in SC-lcs. In conclusion, our data demonstrate that S1R plays an important role in skin MSC differentiation towards myelinating Schwann cells.

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#28412968   2017/04/17 Save this To Up

Interleukin-1 primes human mesenchymal stem cells towards an anti-inflammatory and pro-trophic phenotype in vitro.

Inflammation is a key contributor to central nervous system (CNS) injury such as stroke, and is a major target for therapeutic intervention. Effective treatments for CNS injuries are limited and applicable to only a minority of patients. Stem cell-based therapies are increasingly considered for the treatment of CNS disease, because they can be used as in-situ regulators of inflammation, and improve tissue repair and recovery. One promising option is the use of bone marrow-derived mesenchymal stem cells (MSCs), which can secrete anti-inflammatory and trophic factors, can migrate towards inflamed and injured sites or can be implanted locally. Here we tested the hypothesis that pre-treatment with inflammatory cytokines can prime MSCs towards an anti-inflammatory and pro-trophic phenotype in vitro.

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#28403322   2017/04/13 Save this To Up

Serum concentrations of brain-derived neurotrophic factor in patients diagnosed with gender dysphoria undergoing sex reassignment surgery.

Transsexualism (ICD-10) is a condition characterized by a strong and persistent dissociation with one's assigned gender. Sex reassignment surgery (SRS) and hormone therapy provide a means of allowing transsexual individuals to feel more congruent with their gender and have played a major role in treatment over the past 70 years. Brain-derived neurotrophic factor (BDNF) appears to play a key role in recovery from acute surgical trauma and environmentally mediated vulnerability to psychopathology. We hypothesize that BDNF may be a biomarker of alleviation of gender incongruence suffering.

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