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https://www.readbyqxmd.com/read/28529157/protective-treatments-and-their-target-retinal-ganglion-cells-in-diabetic-retinopathy
#1
REVIEW
Jing Zhang, Rong Liu, Hong-Yu Kuang, Xin-Yuan Gao, Hao-Ling Liu
Diabetic retinopathy(DR)is one of the complications of diabetes which could cause severe vision loss. Retinal ganglion cell(RGC)injury has been confirmed prior to micro-vascular damage. Over the past few decades, a number of animal and clinical studies have confirmed that RGC impairment leads to an early deterioration of vision in DR. Inhibition of aldose reductase (AR), advanced glycation end product (AGE), oxidative stress, glutamate toxicity, and an inflammatory response may play important roles in protecting RGCs in DR...
May 18, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28528122/probdnf-inhibits-proliferation-migration-and-differentiation-of-mouse-neural-stem-cells
#2
Jia-Yi Li, Jia Liu, Nimshitha Pavathuparambil Abdul Manaph, Larisa Bobrovskaya, Xin-Fu Zhou
ProBDNF, a precursor of brain-derived neurotrophic factor (BDNF), is an important regulator of neurodegeneration, hippocampal long-term depression, and synaptic plasticity. ProBDNF and its receptors pan-neurotrophin receptor p75 (p75NTR), vps10p domain-containing receptor Sortilin and tropomyosin receptor kinase B (TrkB) are expressed in neuronal and glial cells. The role of proBDNF in regulation of neurogenesis is not fully defined. This study aims to uncover the function of proBDNF in regulating the differentiation, migration and proliferation of mouse neural stem cells (NSCs) in vitro...
May 17, 2017: Brain Research
https://www.readbyqxmd.com/read/28528080/toxicological-aspects-of-interesterified-fat-brain-damages-in-rats
#3
Lívia Ferraz D'avila, Verônica Tironi Dias, Luciana Taschetto Vey, Laura Hautrive Milanesi, Karine Roversi, Tatiana Emanuelli, Marilise Escobar Bürger, Fabíola Trevizol
In recent years, interesterified fat (IF) has been used to replace hydrogenated vegetable fat (HVF), rich in trans isomers, being found in processed foods. Studies involving IF have shown deleterious influences on the metabolic system, similarly to HVF, whereas no studies regarding its influence on the central nervous system (CNS) were performed. Rats from first generation born and maintained under supplementation (3g/Kg, p.o.) of soybean-oil or IF until adulthood were assessed on memory, biochemical and molecular markers in the hippocampus...
May 17, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28526875/endophilinas-regulate-endosomal-sorting-of-bdnf-trkb-to-mediate-survival-signaling-in-hippocampal-neurons
#4
Katja Burk, John D Murdoch, Siona Freytag, Melanie Koenig, Vinita Bharat, Ronja Markworth, Susanne Burkhardt, Andre Fischer, Camin Dean
The sorting of activated receptors into distinct endosomal compartments is essential to activate specific signaling cascades and cellular events including growth and survival. However, the proteins involved in this sorting are not well understood. We discovered a novel role of EndophilinAs in sorting of activated BDNF-TrkB receptors into late endosomal compartments. Mice lacking all three EndophilinAs accumulate Rab7-positive late endosomes. Moreover, EndophilinAs are differentially localized to, co-traffic with, and tubulate, distinct endosomal compartments: In response to BDNF, EndophilinA2 is recruited to both early and late endosomes, EndophilinA3 is recruited to Lamp1-positive late endosomes, and co-trafficks with Rab5 and Rab7 in both the presence and absence of BDNF, while EndophilinA1 colocalizes at lower levels with endosomes...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28524074/neurotrauma-the-crosstalk-between-neurotrophins-and-inflammation-in-the-acutely-injured-brain
#5
REVIEW
Lindolfo da Silva Meirelles, Daniel Simon, Andrea Regner
Traumatic brain injury (TBI) is a major cause of morbidity and mortality among young individuals worldwide. Understanding the pathophysiology of neurotrauma is crucial for the development of more effective therapeutic strategies. After the trauma occurs, immediate neurologic damage is produced by the traumatic forces; this primary injury triggers a secondary wave of biochemical cascades together with metabolic and cellular changes, called secondary neural injury. In the scenario of the acutely injured brain, the ongoing secondary injury results in ischemia and edema culminating in an uncontrollable increase in intracranial pressure...
May 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28523372/dietary-eicosapentaenoic-acid-normalizes-hippocampal-omega-3-and-6-polyunsaturated-fatty-acid-profile-attenuates-glial-activation-and-regulates-bdnf-function-in-a-rodent-model-of-neuroinflammation-induced-by-central-interleukin-1%C3%AE-administration
#6
Yilong Dong, Min Xu, Allan V Kalueff, Cai Song
PURPOSE: Interleukin (IL)-1β can activate glial cells to trigger neuroinflammation and neurodegeneration. Lower omega (n)-3 polyunsaturated fatty acids (PUFAs) and lower n-3/n-6 PUFA ratios occur in the brain of patients with Alzheimer's disease (AD). We have previously reported that an n-3 PUFA, eicosapentaenoic acid (EPA), can improve memory and attenuate neurodegeneration-like changes in animal models of AD. However, whether and how EPA modulates glial cell activity and functions remains unclear...
May 18, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28522736/myelin-associated-glycoprotein-mag-inhibits-schwann-cell-migration-and-induces-their-death
#7
Nagarathnamma Chaudhry, Corinne Bachelin, Violetta Zujovic, Melissa Hilaire, Katherine T Baldwin, Rose M Follis, Roman Giger, Bruce D Carter, Anne Baron-Van Evercooren, Marie T Filbin
Remyelination of central nervous system (CNS) axons by Schwann cells (SC) is not efficient, in part due to their poor migration into the adult CNS. Although it is known that migrating SC avoid white matter tracts, the molecular mechanisms underlying this exclusion has never been elucidated. We now demonstrate that myelin-associated glycoprotein (MAG), a well-known inhibitor of neurite outgrowth, inhibits rat SC migration and induces their death via γ secretase-dependent regulated intramembrane proteolysis (RIP) of the p75 neurotrophin receptor (also known as p75 cleavage)...
May 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28515680/trk-receptors-and-neurotrophin-cross-interactions-new-perspectives-toward-manipulating-therapeutic-side-effects
#8
Yazan Haddad, Vojtěch Adam, Zbyněk Heger
Some therapeutic side-effects result from simultaneous activation of homolog receptors by the same ligand. Tropomyosin receptor kinases (TrkA, TrkB and TrkC) play a major role in the development and biology of neurons through neurotrophin signaling. The wide range of cross-interactions between Trk receptors and neurotrophins vary in selectivity, affinity and function. In this study, we discuss new perspectives to the manipulation of side-effects via a better understanding of the cross-interactions at the molecular level, derived by computational methods...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28511287/generation-and-characterization-of-highly-purified-canine-schwann-cells-from-spinal-nerve-dorsal-roots-as-potential-new-candidates-for-transplantation-strategies
#9
Nicole Steffensen, Annika Lehmbecker, Ingo Gerhauser, Yimin Wang, Regina Carlson, Andrea Tipold, Wolfgang Baumgärtner, Veronika M Stein
Schwann cells (SCs) are promising candidates for transplantation-strategies in the central nervous system by promoting axonal regeneration. The dog represents a translational model for human spinal cord injury (SCI) for studies with new repair strategies after intervertebral disk herniation (IVDH). To overcome the necessity for an additional surgical procedure, for the first time a protocol for isolation, and purification of canine SCs from spinal-nerve-biopsies during standard hemilaminectomy in IVDH affected paraplegic dogs for potential transplantation was developed...
May 16, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28508312/trpc-channels-and-programmed-cell-death
#10
Jian Zhou, Yichang Jia
Neurotrophins, including nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF), bind to their high-affinity receptors to promote neuronal survival during brain development. One of the key downstream pathways is the phospholipase C (PLC) pathway, which not only plays a central role in calcium release from internal store but also in activation of TRPC channels coupled with neurotrophin receptors. TRPC channels are required for the neurotrophin-mediated neuronal protective effects. In addition, activation of TRPC channels is able to protect neurons in the absence of neurotrophin...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28507518/beneficial-effects-of-sulforaphane-treatment-in-alzheimer-s-disease-may-be-mediated-through-reduced-hdac1-3-and-increased-p75ntr-expression
#11
Jingzhu Zhang, Rui Zhang, Zhipeng Zhan, Xinhui Li, Fuyuan Zhou, Aiping Xing, Congmin Jiang, Yanqiu Chen, Li An
Alzheimer's disease is an irreversible, progressive neurodegenerative disorder. The accumulation of Aβ in the brain is thought to play a causative role in the development of cognitive dysfunction in Alzheimer's disease. The p75 neurotrophin receptor is of great importance to protect against the Aβ burden and its expression is regulated by histone acetylation. This study investigated whether the phytochemical sulforaphane, a pan-histone deacetylase inhibitor, up-regulates the p75 neurotrophin receptor expression via affecting histone acetylation in protection against Alzheimer's disease...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28506823/hyperammonemia-compromises-glutamate-metabolism-and-reduces-bdnf-in-the-rat-hippocampus
#12
Fabiana Galland, Elisa Negri, Carollina Da Ré, Fernanda Fróes, Liliane Strapazzon, Maria Cristina Guerra, Lucas Silva Tortorelli, Carlos-Alberto Gonçalves, Marina Concli Leite
Ammonia is putatively the major toxin associated with hepatic encephalopathy (HE), a neuropsychiatric manifestation that results in cognitive impairment, poor concentration and psychomotor alterations. The hippocampus, a brain region involved in cognitive impairment and depressive behavior, has been studied less than neocortical regions. Herein, we investigated hippocampal astrocyte parameters in a hyperammonemic model without hepatic lesion and in acute hippocampal slices exposed to ammonia. We also measured hippocampal BDNF, a neurotrophin commonly related to synaptic plasticity and cognitive deficit, and peripheral S100B protein, used as a marker for brain damage...
May 12, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28505381/insulin-resistance-disrupts-the-interaction-between-akt-and-the-nmda-receptor-and-the-inactivation-of-the-camkiv-creb-pathway-in-minimal-hepatic-encephalopathy
#13
Saidan Ding, Weishan Zhuge, Jianjing Yang, Fangfang Wen, Zhu Xu, Xuebao Wang, Qichuan Zhuge
Hepatic cirrhosis-induced Minimal hepatic encephalopathy (MHE) has been characterized for cognitive dysfunction and central nervous system (CNS) insulin resistance (IR) has been acknowledged to be closely correlated with cognitive impairment while hepatic cirrhosis has been recognized to induce IR . Thus, this study aimed to investigate whether CNS IR occurred in MHE and induced MHE, as well as the underlying mechanism. We found IR in the MHE rats, an especially decreased level of the insulin receptor (InsR), and an increased serine phosphorylation of IRS1 in CNS...
May 15, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28501999/elisa-for-monitoring-nerve-growth-factor
#14
Justin B Davis
Nerve growth factor (NGF), a neurotrophin critical to neuronal viability, has become a popular research focus for the treatment of neurodegenerative diseases. Enzyme-linked immunosorbent assays (ELISA) allow the quantification of cellular proteins, such as NGF, secreted into conditioned culture media. However, off-the-shelf reagents and kit components may require optimization depending on the specific specimens and/or antibodies that will be utilized with the ELISA assay. Herein we describe a protocol for developing a sandwich ELISA, incorporating NGF-specific primary and secondary antibodies capable of detecting NGF at concentrations as low as 10 pg/mL...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28499298/-cochlear-implant-state-of-the-art
#15
Thomas Lenarz
Cochlear implants are the treatment of choice for the auditory rehabilitation of patients with sensory deafness. They restore the missing function of inner hair cells by transforming the acoustic signal into electrical stimuli for activation of auditory nerve fibers. Due to the very fast technology development cochlear implants provide open-set speech understanding in the majority of patients including the use of the telephone. Children can achieve a near to normal speech and language development provided their deafness is detected early after onset and implantation is performed quickly thereafter...
April 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/28498887/sex-differences-in-risk-for-alzheimer-s-disease-related-to-neurotrophin-gene-polymorphisms-the-cache-county-memory-study
#16
Joshua Matyi, JoAnn T Tschanz, Gail B Rattinger, Chelsea Sanders, E K Vernon, Chris Corcoran, John S K Kauwe, Mona Buhusi
Neurotrophins, including nerve-growth factor (NGF) and brain-derived neurotrophic factor (BDNF), have been implicated in Alzheimer's disease (AD). Associations between AD and neurotrophin signaling genes have been inconsistent, with few studies examining sex differences in risk. We examined four single-nucleotide polymorphisms (SNPs) involved in neurotrophin signaling (rs6265, rs56164415, rs2289656, rs2072446) and risk for AD by sex in a population-based sample of older adults. 3499 individuals without dementia at baseline [Mean (SD) age = 74...
May 12, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28498321/bdnf-binds-its-pro-peptide-with-high-affinity-and-the-common-val66met-polymorphism-attenuates-the-interaction
#17
Koichi Uegaki, Haruko Kumanogoh, Toshiyuki Mizui, Takatsugu Hirokawa, Yasuyuki Ishikawa, Masami Kojima
Most growth factors are initially synthesized as precursors then cleaved into bioactive mature domains and pro-domains, but the biological roles of pro-domains are poorly understood. In the present study, we investigated the pro-domain (or pro-peptide) of brain-derived neurotrophic factor (BDNF), which promotes neuronal survival, differentiation and synaptic plasticity. The BDNF pro-peptide is a post-processing product of the precursor BDNF. Using surface plasmon resonance and biochemical experiments, we first demonstrated that the BDNF pro-peptide binds to mature BDNF with high affinity, but not other neurotrophins...
May 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28495803/on-the-run-for-hippocampal-plasticity
#18
C'iana Cooper, Hyo Youl Moon, Henriette van Praag
Accumulating research in rodents and humans indicates that exercise benefits brain function and may prevent or delay onset of neurodegenerative conditions. In particular, exercise modifies the structure and function of the hippocampus, a brain area important for learning and memory. This review addresses the central and peripheral mechanisms underlying the beneficial effects of exercise on the hippocampus. We focus on running-induced changes in adult hippocampal neurogenesis, neural circuitry, neurotrophins, synaptic plasticity, neurotransmitters, and vasculature...
May 11, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28495373/amyloid-beta-neurotoxicity-and-clearance-are-both-regulated-by-glial-group-ii-metabotropic-glutamate-receptors
#19
Daniela Durand, Lila Carniglia, Juan Turati, Delia Ramírez, Julieta Saba, Carla Caruso, Mercedes Lasaga
Astrocytes are now fully endorsed as key players in CNS functionality and plasticity. We recently showed that metabotropic glutamate receptor 3 (mGlu3R) activation by LY379268 promotes non-amyloidogenic cleavage of amyloid precursor protein (APP) in cultured astrocytes, leading to increased release of neuroprotective sAPPα. Furthermore, mGlu3R expression is reduced in hippocampal astrocytes from PDAPP-J20 mice, suggesting a role for these receptors in Alzheimer's disease. The present study enquires into the role of astroglial-derived neurotrophins induced by mGlu3R activation in neurotoxicity triggered by amyloid β (Aβ)...
May 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28494216/cough-reflex-hypersensitivity-a-role-for-neurotrophins
#20
Ahmed Z El-Hashim, Sahar M Jaffal
Cough is one of the most common complaints for which sufferers seek medical assistance. However, currently available drugs are not very effective in treating cough, particularly that which follows an upper respiratory tract infection. Nonetheless, there has been a significant increase in our understanding of the mechanisms and pathways of the defensive cough as well as the hypersensitive/pathophysiological cough, both at airway and central nervous system (CNS) levels. Numerous molecules and signaling pathways have been identified as potential targets for antitussive drugs, including neurotrophins (NTs)...
March 2017: Experimental Lung Research
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