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Tropomyosin

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https://www.readbyqxmd.com/read/28807678/metformin-lowers-%C3%AE-synuclein-phosphorylation-and-upregulates-neurotrophic-factor-in-the-mptp-mouse-model-of-parkinson-s-disease
#1
Nikita Katila, Sunil Bhurtel, Sina Shadfar, Sunil Srivastav, Sabita Neupane, Uttam Ojha, Gil-Saeng Jeong, Dong-Young Choi
In spite of the massive research for the identification of neurorestorative or neuroprotective intervention for curing Parkinson's disease (PD), there is still lack of clinically proven neuroprotective agents. Metformin, a common anti-hyperglycemic drug has been known to possess neuroprotective properties. However, specific mechanisms by which metformin protects neurons from 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) neurotoxicity remain to be elucidated. In this study, we assessed the neuroprotective effects of metformin in the subchronic MPTP model of PD, and explored its feasible mechanisms for neuroprotection...
August 11, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28803853/developmental-suppression-of-forebrain-trka-receptors-and-attentional-capacities-in-aging-rats-a-longitudinal-study
#2
Brittney Yegla, Vinay Parikh
Basal forebrain (BF) cholinergic neurons innervating the cortex regulate cognitive, specifically attentional, processes. Cholinergic atrophy and cognitive decline occur at an accelerated pace in age-related neurodegenerative disorders such as Alzheimer's disease; however, the mechanism responsible for this phenomenon remains unknown. Here we hypothesized that developmental suppression of nerve growth factor signaling, mediated via tropomyosin-related kinase A (trkA) receptors, would escalate age-related attentional vulnerability...
August 10, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28793172/tropomyosin-receptor-kinase-a-expression-on-merkel-cell-carcinoma-cells
#3
Ulrike Wehkamp, Sophie Stern, Sandra Krüger, Axel Hauschild, Christoph Röcken, Friederike Egberts
Importance: Merkel cell carcinoma (MCC) is a malignant neuroendocrine skin tumor frequently associated with the Merkel cell polyomavirus. Immune checkpoint therapy showed remarkable results, although not all patients are responsive to this therapy. Anti-tropomyosin receptor kinase A (TrkA)-targeted treatment has shown promising results in several tumor entities. Objective: To determine TrkA expression in MCC as a rationale for potential targeted therapy. Design, Setting, and Participants: This case series study investigated the MCC specimens of 55 patients treated at the Department of Dermatology, University Hospital of Schleswig-Holstein, Kiel, Germany, from January 1, 2005, through December 31, 2015...
August 9, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/28767688/cross-reaction-between-formosan-termite-coptotermes-formosanus-proteins-and-cockroach-allergens
#4
Christopher P Mattison, Taruna Khurana, Matthew R Tarver, Christopher B Florane, Casey C Grimm, Suman B Pakala, Carrie B Cottone, Claudia Riegel, Yvette Bren-Mattison, Jay E Slater
Cockroach allergens can lead to serious allergy and asthma symptoms. Termites are evolutionarily related to cockroaches, cohabitate in human dwellings, and represent an increasing pest problem in the United States. The Formosan subterranean termite (Coptotermes formosanus) is one of the most common species in the southern United States. Several assays were used to determine if C. formosanus termite proteins cross-react with cockroach allergens. Expressed sequence tag and genomic sequencing results were searched for homology to cockroach allergens using BLAST 2...
2017: PloS One
https://www.readbyqxmd.com/read/28767412/the-prognostic-value-of-over-expressed-trkb-in-solid-tumors-a-systematic-review-and-meta-analysis
#5
Chunze Zhang, Xiaoting Li, Dan Gao, Haihua Ruan, Zhenzhen Lin, Xiaobo Li, Guang Liu, Zhicheng Ma, Xichuan Li
It is reported recently Tropomyosin-related receptor Kinase B (TrkB) plays key roles in the anoikis resistance during the processes of tumorigenesis and metastasis. However, its prognostic significance for clinical patients remains inconclusive. In order to establish a correct and practicable link between increased TrkB and prognostication of human solid tumors, a meta-analysis was performed in this article. A systematic literature research in the electronic databases PubMed, Embase and Web of Science was performed to identify eligible studies...
July 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28761415/dual-and-multi-drug-delivery-nanoparticles-towards-neuronal-survival-and-synaptic-repair
#6
REVIEW
Angelina Angelova, Borislav Angelov
Among the macromolecular drug targets in neurodegenerative disorders, the neurotrophin brain-derived neurotrophic factor (BDNF) and its high-affinity tropomyosin-related kinase receptor (TrkB) present strong interest for nanomedicine development aiming at neuronal and synaptic repair. Currently, BDNF is regarded as the neurotrophic factor of highest therapeutic significance. However, BDNF has delivery problems as a protein drug. The enhanced activation of the transcription factor CREB (cAMP response element-binding protein) has been evidenced to increase the BDNF gene expression and hence the production of endogenous BDNF...
June 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28761093/combined-serum-levels-of-multiple-proteins-in-tpa-bdnf-pathway-may-aid-the-diagnosis-of-five-mental-disorders
#7
Suzhen Chen, Haitang Jiang, Yang Liu, Zhenhua Hou, Yingying Yue, Yuqun Zhang, Fuying Zhao, Zhi Xu, Yinghui Li, Xiaodong Mou, Lei Li, Tianyu Wang, Jingjing Zhao, Chongyang Han, Yuxiu Sui, Ming Wang, Zhong Yang, Yan Lu, Yifeng Zhu, Jianhua Li, Xinhua Shen, Fei Sun, Qingsong Chen, Huanxin Chen, Yonggui Yuan
Mental disorders are severe, disabling conditions with unknown etiology and are commonly misdiagnosed when clinical symptomology criteria are solely used. Our previous work indicated that combination of serum levels of multiple proteins in tissue plasminogen activator (tPA)-brain-derived neurotrophic factor (BDNF) pathway improved accuracy of diagnosis of major depressive disorder (MDD). Here, we measured serum levels of tPA, plasminogen activator inhibitor-1 (PAI-1), BDNF, precursor-BDNF (proBDNF), tropomyosin-related kinase B (TrkB) and neurotrophin receptor p75 (p75NTR) in patients with paranoid schizophrenia (SZ, n = 34), MDD (n = 30), bipolar mania (BM, n = 30), bipolar depression (BD, n = 22), panic disorder (PD, n = 30), and healthy controls (HCs, n = 30) by Enzyme-linked immunosorbent assay kits...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28754317/natural-antisense-transcript-tpm1-as-regulates-the-alternative-splicing-of-tropomyosin-i-through-an-interaction-with-rna-binding-motif-protein-4
#8
Guo-Wei Huang, Ying-Li Zhang, Lian-Di Liao, En-Min Li, Li-Yan Xu
LncRNAs play a vital role in alternative splicing of target genes. However, the mechanisms underlying lncRNAs involvement in splicing are poorly understood. In the present study, we identified a previously uncharacterized lncRNA, which is denoted as TPM1-AS, is reverse-transcribed from the fourth intronic region of the tropomyosin I (TPM1). In situ hybridization and RNA immunoprecipitation assays demonstrated that TPM1-AS was located in the nucleus and interacted with RNA-binding motif protein 4 (RBM4) in human esophageal cancer cells...
July 25, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28751069/activity-dependent-brain-derived-neurotrophic-factor-release-is-required-for-the-rapid-antidepressant-actions-of-scopolamine
#9
Sriparna Ghosal, Eunyoung Bang, Wenzhu Yue, Brendan D Hare, Ashley E Lepack, Matthew J Girgenti, Ronald S Duman
BACKGROUND: Brain-derived neurotrophic factor (BDNF) plays a key role in the pathophysiology and treatment of depression. Recent clinical studies demonstrate that scopolamine, a nonselective muscarinic acetylcholine receptor antagonist, produces rapid antidepressant effects in patients with depression. Rodent studies demonstrate that scopolamine increases glutamate transmission and synaptogenesis in the medial prefrontal cortex (mPFC). Here we tested the hypothesis that activity-dependent BDNF release within the mPFC is necessary for the antidepressant actions of scopolamine...
June 23, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28742111/axonal-outgrowth-neuropeptides-expression-and-receptors-tyrosine-kinase-phosphorylation-in-3d-organotypic-cultures-of-adult-dorsal-root-ganglia
#10
Estrela Neto, Cecília J Alves, Luís Leitão, Daniela M Sousa, Inês S Alencastre, Francisco Conceição, Meriem Lamghari
Limited knowledge from mechanistic studies on adult sensory neuronal activity was generated, to some extent, in recapitulated adult in vivo 3D microenvironment. To fill this gap there is a real need to better characterize the adult dorsal root ganglia (aDRG) organotypic cultures to make these in vitro systems exploitable for different approaches, ranging from basic neurobiology to regenerative therapies, to address the sensory nervous system in adult stage. We conducted a direct head-to-head comparison of aDRG and embryonic DRG (eDRG) organotypic culture focusing on axonal growth, neuropeptides expression and receptors tyrosine kinase (RTK) activation associated with neuronal survival, proliferation and differentiation...
2017: PloS One
https://www.readbyqxmd.com/read/28732667/contribution-of-bdnf-trkb-signalling-in-the-racc-to-the-development-of-pain-related-aversion-via-activation-of-erk-in-rats-with-spared-nerve-injury
#11
Xu Wang, Le Zhang, Yufeng Zhan, Dengping Li, Yuangui Zhang, Gongming Wang, Mengyuan Zhang
The rostral anterior cingulate cortex (rACC) is a key structure in mediating the negative affective component of chronic pain. Brain-derived neurotrophic factor (BDNF) is known to play a critical role in activity-dependent synaptic plasticity, learning and memory. It has been shown that BDNF signalling in the rACC might be involved in spontaneous pain-related aversion, but its underlying mechanism is still largely unknown. To address this question, we measured the mRNA and protein levels of BDNF in the rACC after nerve injury and found that BDNF expression was markedly higher in nerve-injured rats than in controls...
July 18, 2017: Brain Research
https://www.readbyqxmd.com/read/28732641/the-cardiomyopathy-associated-k15n-mutation-in-tropomyosin-alters-actin-filament-pointed-end-dynamics
#12
Mert Colpan, Thu Ly, Samantha Grover, Dmitri Tolkatchev, Alla S Kostyukova
Correct assembly of thin filaments composed of actin and actin-binding proteins is of crucial importance for properly functioning muscle cells. Tropomyosin (Tpm) mediates the binding of tropomodulin (Tmod) and leiomodin (Lmod) at the slow-growing, or pointed, ends of the thin filaments. Together these proteins regulate thin filament lengths and actin dynamics in cardiac muscle. The K15N mutation in the TPM1 gene is associated with familial dilated cardiomyopathy (DCM) but the effect of this mutation on Tpm's function is unknown...
July 18, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28732351/tropomyosin-isoform-tpm2-1-regulates-collective-and-amoeboid-cell-migration-and-cell-aggregation-in-breast-epithelial-cells
#13
HyeRim Shin, Dayoung Kim, David M Helfman
Metastasis dissemination is the result of various processes including cell migration and cell aggregation. These processes involve alterations in the expression and organization of cytoskeletal and adhesion proteins in tumor cells. Alterations in actin filaments and their binding partners are known to be key players in metastasis. Downregulation of specific tropomyosin (Tpm) isoforms is a common characteristic of transformed cells. In this study, we examined the role of Tpm2.1 in non-transformed MCF10A breast epithelial cells in cell migration and cell aggregation, because this isoform is downregulated in primary and metastatic breast cancer as well as various breast cancer cell lines...
July 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/28722633/characterization-of-sarcoptes-scabiei-tropomyosin-and-paramyosin-immunoreactive-allergens-in-scabies
#14
Shumaila Naz, Marion Desclozeaux, Kate E Mounsey, Farhana Riaz Chaudhry, Shelley Walton
Scabies is a human skin disease due to the burrowing ectoparasite Sarcoptes scabiei var. hominis resulting in intense itching and inflammation and manifesting as a skin allergy. Because of insufficient mite material and lack of in vitro propagation system for antigen preparation, scabies is a challenging disease to develop serological diagnostics. For allergen characterization, full-length S. scabiei tropomyosin (Sar s 10) was cloned, expressed in pET-15b, and assessed for reactivity with IgE antibodies from human sera...
July 10, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28720661/stabilization-of-f-actin-by-tropomyosin-isoforms-regulates-the-morphology-and-mechanical-behavior-of-red-blood-cells
#15
Zhenhua Sui, David S Gokhin, Roberta B Nowak, Xinhua Guo, Xiuli An, Velia M Fowler
The short F-actins in the red blood cell (RBC) membrane skeleton are coated along their lengths by an equimolar combination of two tropomyosin isoforms, Tpm1.9 and Tpm3.1. We hypothesized that tropomyosins' ability to stabilize F-actin regulates RBC morphology and mechanical properties. To test this, we examined mice with a targeted deletion in alternatively spliced exon 9d of Tpm3 (Tpm3/9d(-/-) ), which leads to absence of Tpm3.1 in RBCs along with a compensatory increase in Tpm1.9 of sufficient magnitude to maintain normal total tropomyosin content...
July 18, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28717602/expression-of-various-sarcomeric-tropomyosin-isoforms-in-equine-striated-muscles
#16
Syamalima Dube, Henry Chionuma, Amr Matoq, Ruham Alshiekh-Nasany, Lynn Abbott, Bernard J Poiesz, Dipak K Dube
In order to better understand the training and athletic activity of horses, we must have complete understanding of the isoform diversity of various myofibrillar protein genes like tropomyosin. Tropomyosin (TPM), a coiled-coil dimeric protein, is a component of thin filament in striated muscles. In mammals, four TPM genes (TPM1, TPM2, TPM3, and TPM4) generate a multitude of TPM isoforms via alternate splicing and/or using different promoters. Unfortunately, our knowledge of TPM isoform diversity in the horse is very limited...
2017: Open veterinary journal
https://www.readbyqxmd.com/read/28715685/metabolic-profile-study-of-7-8-dihydroxyflavone-in-monkey-plasma-using-high-performance-liquid-chromatography-tandem-mass-spectrometry
#17
Taoping Sun, Sijing Chen, Hao Huang, Tianqing Li, Wei Yang, Liegang Liu
7, 8-Dihydroxyflavone, as a high-affinity tropomyosin-receptor-kinase B agonist, can mimic the physiological actions of brain-derived neurotrophic factor and exert a variety of neurological actions in numerous models including Parkinsońs disease, depression, learning and memory. Nonetheless, a limited number of studies have been focused on its metabolism in mammal and no methodology has been reported for the determination of 7, 8-DHF and its metabolites. Herein, we developed a rapid, sensitive and accurate method using high performance liquid chromatography-tandem mass spectroscopy for the determination of 7, 8-DHF and its metabolites in monkey plasma...
July 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28709891/neuroprotective-effects-of-methyl-3-4-dihydroxybenzoate-in-a-mouse-model-of-retinitis-pigmentosa
#18
Jia Zhang, Di Xu, Huan Ouyang, Songhui Hu, Ang Li, Huanmin Luo, Ying Xu
Retinitis pigmentosa is a photoreceptor-degenerative disease that is currently untreatable and eventually causes blindness. Methyl 3,4 dihydroxybenzoate (MDHB) is a small molecule that exerts neuroprotective effects in vitro. The present study tests whether MDHB protects the retina of rd10 mice, a model of retinitis pigmentosa. MDHB or an equal volume of vehicle was intraperitoneally injected in rd10 mice daily from postnatal day 12 (P12) to P26. Retinal morphology was evaluated by immunostaining, and retinal function by electroretinogram (ERG) and by visual behavior...
September 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28696690/a-kinome-wide-selective-radiolabeled-trkb-c-inhibitor-for-in-vitro-and-in-vivo-neuroimaging-synthesis-preclinical-evaluation-and-first-in-human
#19
Vadim Bernard-Gauthier, Justin J Bailey, Andrew V Mossine, Simon Klaus Lindner, Lena Vomacka, Arturo Aliaga, Xia Shao, Carole A Quesada, Phillip S Sherman, Anne Mahringer, Alexey Kostikov, Marilyn Grand'Maison, Pedro Rosa-Neto, Jean-Paul Soucy, Alexander Thiel, David R Kaplan, Gert Fricker, Björn Wängler, Peter Bartenstein, Ralf Schirrmacher, Peter J H Scott
The proto-oncogenes NTRK1/2/3 encode the tropomyosin receptor kinases TrkA/B/C which play pivotal roles in neurobiology and cancer. We describe herein the discovery of [(11)C]-(R)-3 ([(11)C]-(R)-IPMICF16), a first-in-class positron emission tomography (PET) TrkB/C-targeting radiolabeled kinase inhibitor lead. Relying on extensive human kinome vetting, we show that (R)-3 is the most potent and most selective TrkB/C inhibitor characterized to date. It is demonstrated that [(11)C]-(R)-3 readily crosses the blood-brain barrier (BBB) in rodents and selectively binds to TrkB/C receptors in vivo, as evidenced by entrectinib blocking studies...
July 11, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28695340/tropomyosin-receptor-kinase-c-trkc-expression-in-medulloblastoma-relation-to-the-molecular-subgroups-and-impact-on-treatment-response
#20
Carsten Friedrich, Tarek Shalaby, Christoph Oehler, Martin Pruschy, Burkhardt Seifert, Daniel Picard, Marc Remke, Monika Warmuth-Metz, Rolf-Dieter Kortmann, Stefan Rutkowski, Michael A Grotzer, André O von Bueren
PURPOSE: High messenger RNA (mRNA) expression of the tropomyosin receptor kinase C gene (TrkC) has been associated with favorable survival in medulloblastoma patients. Untested is whether it plays a role through modulating the response to therapy or whether it might be a surrogate marker for a favorable molecular subgroup. METHODS: The medulloblastoma-derived cell line DAOY was stably transfected to overexpress TrkC (clone DAOY-TrkC) and compared to a control (clone DAOY-EV, empty vector transfected)...
July 10, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
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