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Tropomyosin

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https://www.readbyqxmd.com/read/28333386/myofilaments-movers-and-rulers-of-the-sarcomere
#1
Brian Leei Lin, Taejeong Song, Sakthivel Sadayappan
Striated cardiac and skeletal muscles play very different roles in the body, but they are similar at the molecular level. In particular, contraction, regardless of the type of muscle, is a precise and complex process involving the integral protein myofilaments and their associated regulatory components. The smallest functional unit of muscle contraction is the sarcomere. Within the sarcomere can be found a sophisticated ensemble of proteins associated with the thick filaments (myosin, myosin binding protein-C, titin, and obscurin) and thin myofilaments (actin, troponin, tropomyosin, nebulin, and nebulette)...
March 16, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28326307/p75-neurotrophin-receptor-in-the-skin-beyond-its-neurotrophic-function
#2
REVIEW
Carlo Pincelli
p75 neurotrophin receptor (p75(NTR)), also known as CD271, is the low-affinity receptor that, together with the tyrosine kinase receptor tropomyosin-receptor kinase (Trk), mediate neurotrophin (NT) functions. Beside their classic role in skin innervation, NT and their receptors constitute a complex cutaneous network associated with a number of autocrine and paracrine activities. In this context, the role of p75(NTR) is becoming more and more important. This review will focus on the intriguing functions of p75(NTR) in healthy and diseased skin...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28320308/binding-of-smoothelin-like-1-to-tropomyosin-and-calmodulin-is-mutually-exclusive-and-regulated-by-phosphorylation
#3
Annegret Ulke-Lemée, David Hao Sun, Hiroaki Ishida, Hans J Vogel, Justin A MacDonald
BACKGROUND: The smoothelin-like 1 protein (SMTNL1) can associate with tropomyosin (Tpm) and calmodulin (CaM), two proteins essential to the smooth muscle contractile process. SMTNL1 is phosphorylated at Ser301 by protein kinase A during calcium desensitization in smooth muscle, yet the effect of SMTNL1 phosphorylation on Tpm- and CaM-binding has yet to be investigated. RESULTS: Using pull down studies with Tpm-Sepharose and CaM-Sepharose, we examined the interplay between Tpm binding, CaM binding, phosphorylation of SMTNL1 and calcium concentration...
March 21, 2017: BMC Biochemistry
https://www.readbyqxmd.com/read/28319380/evaluation-and-characterization-of-trk-kinase-inhibitors-for-the-treatment-of-pain-reliable-binding-affinity-predictions-from-theory-and-computation
#4
Shunzhou Wan, Agastya P Bhati, Sarah Skerratt, Kiyoyuki Omoto, Veerabahu Shanmugasundaram, Sharan K Bagal, Peter Vivian Coveney
Optimisation of ligand binding affinity to the target protein of interest is a primary objective in small-molecule drug discovery. Until now, the prediction of binding affinities by computational methods has not been widely applied in the drug discovery process, mainly due to its lack of accuracy and reproducibility, as well as the long turnaround times required to obtain results. Herein, we report on a collaborative study that compares tropomyosin receptor kinase A (TrkA) binding affinity predictions using two recently formulated fast computational approaches - namely ESMACS (Enhanced Sampling of Molecular dynamics with Approximation of Continuum Solvent) and TIES (Thermodynamic Integration with Enhanced Sampling) - to experimentally derived TrkA binding affinities for a set of Pfizer pan-Trk compounds...
March 20, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28315978/the-hallucinogen-2-5-dimethoxy-4-iodoamphetamine-hydrochloride-activates-neurotrophin-receptors-in-a-neuronal-cell-line-and-promotes-neurites-extension
#5
Zoya Marinova, Susanne Walitza, Edna Grünblatt
Decreased neurotrophic factors expression and neurotrophin receptors signalling have repeatedly been reported in association with stress, depression, and neurodegenerative disorders. We have previously identified the hallucinogen 2,5-dimethoxy-4-iodoamphetamine hydrochloride (DOI) as protective against trophic deprivation-induced cytotoxicity in human neuroblastoma SK-N-SH cells and established the dependence of this effect on the 5-HT2A receptor, tyrosine kinases activity, and the extracellular signal-regulated kinase pathway...
March 18, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28288367/crenomytilus-grayanus-40kda-calponin-like-protein-cdna-cloning-sequence-analysis-tissue-expression-and-post-translational-modifications
#6
Oleg S Matusovsky, Anna V Dobrzhanskaya, Victoria V Pankova, Konstantin V Kiselev, Ulyana V Girich, Nikolay S Shelud'ko
Calponin-like protein (CaP-40), a third major protein after actin and tropomyosin, has recently been identified by us in the Ca(2+)-regulated thin filaments of mussel Crenomytilus grayanus. It contains calponin homology domain, five calponin family repeats and possesses similar biochemical properties as vertebrate smooth muscle calponin. In this paper, we report a full-length cDNA sequence of CaP-40, study its expression pattern on mRNA and protein levels, evaluate CaP-40 post-translational modifications and perform protein-protein interaction analysis...
March 2, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/28282023/competition-between-tropomyosin-fimbrin-and-adf-cofilin-drives-their-sorting-to-distinct-actin-filament-networks
#7
Jenna R Christensen, Glen M Hocky, Kaitlin E Homa, Alisha N Morganthaler, Sarah E Hitchcock-DeGregori, Gregory A Voth, David R Kovar
The fission yeast actin cytoskeleton is an ideal, simplified system to investigate fundamental mechanisms behind cellular self-organization. By focusing on the stabilizing protein tropomyosin Cdc8, bundling protein fimbrin Fim1, and severing protein coffin Adf1, we examined how their pairwise and collective interactions with actin filaments regulate their activity and segregation to functionally diverse F-actin networks. Utilizing multi-color TIRF microscopy of in vitro reconstituted F-actin networks, we observed and characterized two distinct Cdc8 cables loading and spreading cooperatively on individual actin filaments...
March 10, 2017: ELife
https://www.readbyqxmd.com/read/28276320/microrna-107-promotes-proliferation-migration-and-invasion-of-osteosarcoma-cells-by-targeting-tropomyosin-1
#8
Rui Jiang, Chao Zhang, Guangyao Liu, Rui Gu, Han Wu
Osteosarcoma is the most common primary bone malignancy manifested predominantly in children and young adults. Studiesindicated that miR-107 was involved in the pathogenesis of osteosarcoma and TPM1 acted as tumor suppressor in multiple cancers. In this study, we analyzed the effect of miR-107 on human osteosarcoma cells and investigated the mechanism that TPM1 involved. miR-107 expressions in human osteosarcoma tissues and cells were analyzed by quantitative real-time PCR (qRT-PCR). Human osteosarcoma U2OS cells were transfected with miR-107 mimic, inhibitor or scramble controls to evaluate miR-107 effect on cellular migration/invasion, cell viability and apoptosis...
March 8, 2017: Oncology Research
https://www.readbyqxmd.com/read/28273149/effect-of-thermal-processing-on-t-cell-reactivity-of-shellfish-allergens-discordance-with-ige-reactivity
#9
Jodie B Abramovitch, Andreas L Lopata, Robyn E O'Hehir, Jennifer M Rolland
Crustacean allergy is a major cause of food-induced anaphylaxis. We showed previously that heating increases IgE reactivity of crustacean allergens. Here we investigate the effects of thermal processing of crustacean extracts on cellular immune reactivity. Raw and cooked black tiger prawn, banana prawn, mud crab and blue swimmer crab extracts were prepared and IgE reactivity assessed by ELISA. Mass spectrometry revealed a mix of several allergens in the raw mud crab extract but predominant heat-stable tropomyosin in the cooked extract...
2017: PloS One
https://www.readbyqxmd.com/read/28270164/tropomyosin-receptor-antagonism-in-cylindromatosis-trac-an-early-phase-trial-of-a-topical-tropomyosin-kinase-inhibitor-as-a-treatment-for-inherited-cyld-defective-skin-tumours-study-protocol-for-a-randomised-controlled-trial
#10
Amy Cranston, Deborah D Stocken, Elaine Stamp, David Roblin, Julia Hamlin, James Langtry, Ruth Plummer, Alan Ashworth, John Burn, Neil Rajan
BACKGROUND: Patients with germline mutations in a tumour suppressor gene called CYLD develop multiple, disfiguring, hair follicle tumours on the head and neck. The prognosis is poor, with up to one in four mutation carriers requiring complete surgical removal of the scalp. There are no effective medical alternatives to treat this condition. Whole genome molecular profiling experiments led to the discovery of an attractive molecular target in these skin tumour cells, named tropomyosin receptor kinase (TRK), upon which these cells demonstrate an oncogenic dependency in preclinical studies...
March 7, 2017: Trials
https://www.readbyqxmd.com/read/28270021/tropomyosin-receptor-kinase-inhibitors-an-updated-patent-review-for-2010-2016-part-ii
#11
Justin J Bailey, Ralf Schirrmacher, Kristen Farrell, Vadim Bernard-Gauthier
TrkA/B/C receptor activation supports growth, survival, and differentiation of discrete neuronal populations during development, adult life, and ageing but also plays numerous roles in human disease onset and progression. Trk-specific inhibitors have therapeutic applications in cancer and pain and thus constitute a growing area of interest in oncology and neurology. There has been substantial growth in the number of structural classes of Trk inhibitors and the number of industrial entrants to the Trk inhibitor field over the past six years...
March 8, 2017: Expert Opinion on Therapeutic Patents
https://www.readbyqxmd.com/read/28270010/tropomyosin-receptor-kinase-inhibitors-an-updated-patent-review-for-2010-2016-part-i
#12
Justin J Bailey, Ralf Schirrmacher, Kristen Farrell, Vadim Bernard-Gauthier
Tropomyosin receptor kinases (TrkA/B/C) play crucial roles in the development and maintenance of the nervous system, and aberrant expression of Trk has been implicated in neurological disorders as well as neural and non-neural neoplasms. Patent activity encompassing Trk inhibitors has grown substantially over the last 6 years, recognized by a rise in the number of pharmaceutical entrants to the field and the escalation of novel inhibitor chemotypes. Area covered: In Part I of this two part review, a biological and structural overview of Trk is provided in the context of Trk as a therapeutic target for cancer and pain, followed by the report of recent patent literature claiming small molecule inhibitors of Trk family kinases or which describe inhibitors developed for other kinase targets but include noteworthy Trk inhibition/application...
March 8, 2017: Expert Opinion on Therapeutic Patents
https://www.readbyqxmd.com/read/28254884/a-functional-coupling-between-crmp1-and-nav1-7-for-retrograde-propagation-of-semaphorin3a-signaling
#13
Masayuki Yamane, Naoya Yamashita, Tomonobu Hida, Yoshinori Kamiya, Fumio Nakamura, Pappachan Kolattukudy, Yoshio Goshima
Semaphorin3A (Sema3A) is a secreted type of axon guidance molecules that regulates axon wiring through neuropilin-1 (NRP1) and PlexinAs (PlexAs) receptor complex. Sema3A regulates the dendritic branching through a tetrodotoxin (TTX)-sensitive retrograde axonal transport of PlexAs and Tropomyosin-related kinase A (TrkA) complex. We here demonstrate that Nav1.7, a TTX-sensitive Na(+) channel, by coupling with collapsin response mediator protein 1 (CRMP1), mediates the Sema3A-induced retrograde transport. In mouse dorsal root ganglion (DRG) neurons, Sema3A increased co-localization of PlexA4 and TrkA in the growth cones and axons...
March 2, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28248222/on-the-rate-of-synthesis-of-individual-proteins-within-and-between-different-striated-muscles-of-the-rat
#14
Stuart Hesketh, Kanchana Srisawat, Hazel Sutherland, Jonathan Jarvis, Jatin Burniston
The turnover of muscle protein is responsive to different (patho)-physiological conditions but little is known about the rate of synthesis at the level of individual proteins or whether this varies between different muscles. We investigated the synthesis rate of eight proteins (actin, albumin, ATP synthase alpha, beta enolase, creatine kinase, myosin essential light chain, myosin regulatory light chain and tropomyosin) in the extensor digitorum longus, diaphragm, heart and soleus of male Wistar rats (352 ± 30 g body weight)...
March 15, 2016: Proteomes
https://www.readbyqxmd.com/read/28243312/acupuncture-improved-neurological-recovery-after-traumatic-brain-injury-by-activating-bdnf-trkb-pathway
#15
Xiaohong Li, Chong Chen, Xiping Yang, Jingjing Wang, Ming-Liang Zhao, Hongtao Sun, Sai Zhang, Yue Tu
How to promote neural repair following traumatic brain injury (TBI) has long been an intractable problem. Although acupuncture has been demonstrated to facilitate the neurological recovery, the underlying mechanism is elusive. Brain-derived neurotrophic factor (BDNF) exerts substantial protective effects for neurological disorders. In this study, we found that the level of BDNF and tropomyosin receptor kinase B (TrkB) was elevated spontaneously after TBI and reached up to the peak at 12 h. Nevertheless, this enhancement is quickly declined to the normal at 48 h...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28241130/nardostachys-jatamansi-targets-bdnf-trkb-to-alleviate-ketamine-induced-schizophrenia-like-symptoms-in-rats
#16
Anjali Janardhanan, Anjana Sadanand, Arambakkam Janardhanam Vanisree
OBJECTIVE: Schizophrenia, a common neurological disorder appearing in the late teens or early adulthood, is characterized by disorganized thinking, behaviour, and perception of emotions. Aberrant N-methyl-D-aspartate (NMDA) receptor-mediated synaptic plasticity is a major pathological event here due to dysfunction of dopamine and glutamate transmission at NMDA receptors. De-regulated brain-derived neurotrophic factor (BDNF), i.e., its signalling through the tropomyosin receptor kinase B (TrkB) receptor, is a major feature of schizophrenia...
February 28, 2017: Neuropsychobiology
https://www.readbyqxmd.com/read/28238708/brain-derived-neurotrophic-factor-downregulates-immunoglobulin-heavy-chain-binding-protein-expression-after-repeated-cocaine-administration-in-the-rat-dorsal-striatum
#17
Jieun Kim, Ju Hwan Yang, In Soo Ryu, Eun Sang Choe
Brain-derived neurotrophic factor (BDNF) is a key molecule involved in the regulation of glutamatergic neurotransmission in response to chronic stimulation of psychostimulants. This study demonstrated that BDNF in the dorsal striatum regulates the endoplasmic reticulum (ER) stress response after repeated exposure to cocaine. The results showed that unilateral intracaudate infusion of BDNF (0.40, 0.75, or 1.50μg/μL) decreased the repeated cocaine-induced increase in the expression of immunoglobulin heavy chain binding protein (BiP) sensing unfolded or misfolded proteins in a dose-dependent manner...
February 24, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28237704/accumulation-of-immunoglobulin-g-against-dermatophagoides-farinae-tropomyosin-in-dorsal-root-ganglia-of-nc-nga-mice-with-atopic-dermatitis-like-symptoms
#18
Ayaka Otsu, Hiroaki Kawasaki, Mitsutoshi Tominaga, Ayako Shigenaga, Hironori Matsuda, Nobuaki Takahashi, Tadaaki Nakajima, Hisashi Naito, Takeshi Baba, Hideoki Ogawa, Yasuhiro Tomooka, Fumiyuki Yamakura, Kenji Takamori
Atopic dermatitis (AD), a chronic inflammatory skin disease, manifests as intractable itch, but its underlying mechanisms are poorly understood. This study assessed the relationship between immunoglobulin G (IgG) and dorsal root ganglia (DRG) in NC/Nga mice, a model of AD that manifests AD-like symptoms including itch. Immunohistochemical analysis showed large amounts of IgG in DRG extracts of NC/Nga mice with AD-like dermatitis, with a large fraction of the IgG distributed in satellite glial cells of the DRG...
April 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28231034/upscaling-of-hips-cell-derived-neurons-for-high-throughput-screening
#19
Stefanie Traub, Heiko Stahl, Holger Rosenbrock, Eric Simon, Ralf Heilker
The advent of human-induced pluripotent stem (hiPS) cell-derived neurons promised to provide better model cells for drug discovery in the context of the central nervous system. This work demonstrates both the upscaling of cellular expansion and the acceleration of neuronal differentiation to accommodate the immense material needs of a high-throughput screening (HTS) approach. Using GRowth factor-driven expansion and INhibition of NotCH (GRINCH) during maturation, the derived cells are here referred to as GRINCH neurons...
March 2017: SLAS Discov
https://www.readbyqxmd.com/read/28230741/high-frequency-repetitive-transcranial-magnetic-stimulation-rtms-improves-functional-recovery-by-enhancing-neurogenesis-and-activating-bdnf-trkb-signaling-in-ischemic-rats
#20
Jing Luo, Haiqing Zheng, Liying Zhang, Qingjie Zhang, Lili Li, Zhong Pei, Xiquan Hu
Repetitive transcranial magnetic stimulation (rTMS) has rapidly become an attractive therapeutic approach for stroke. However, the mechanisms underlying this remain elusive. This study aimed to investigate whether high-frequency rTMS improves functional recovery mediated by enhanced neurogenesis and activation of brain-derived neurotrophic factor (BDNF)/tropomyosin-related kinase B (TrkB) pathway and to compare the effect of conventional 20 Hz rTMS and intermittent theta burst stimulation (iTBS) on ischemic rats...
February 20, 2017: International Journal of Molecular Sciences
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