Ectopic TWEAKR expression in type I fiber of stroke-prone spontaneously hypertensive rats is related to slow muscle-specific hypotrophy

In this study, we aimed to investigate the pathophysiological characteristics of muscle hypotrophy in SHRSP to determine the therapeutic target molecule(s).Main methodsThe difference in skeletal muscles in the lower leg between WKY and SHRSP was evaluated mainly through weight/tibial length, histological, gene expression, and protein expression analyses.Key findingsSHRSP had a significantly lower weight/tibial length in soleus and gastrocnemius, but not in plantaris and tibialis anterior, indicating that muscles consisting of a relatively high amount of slow muscle fiber were affected. This result was confirmed by the histological analysis of soleus, showing that type I fiber mainly decreased the fiber size. Microarray and protein expression analyses showed that the muscle-specific ubiquitin ligase, muscle RING finger 1 (MuRF1), but not atrogin-1, was highly expressed in soleus, but not in plantaris, in SHRSP. TNF-like weak inducer of apoptosis receptor (TWEAKR) was predicted as a MuRF1 up-regulator by Ingenuity Pathway Analysis and immunostained only in type II fiber in WKY but in both type I and II fibers in SHRSP.SignificanceTWEAKR is a type II-specific receptor in the skeletal muscle. Ectopic TWEAKR expression in type I fiber of SHRSP is most likely involved in slow muscle-specific hypotrophy through MuRF1 overexpression.
Source: Life Sciences - Category: Biology Source Type: research

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Source: Neural Plasticity - Category: Neurology Authors: Tags: Neural Plast Source Type: research
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Source: PsyBlog | Psychology Blog - Category: Psychiatry & Psychology Authors: Tags: Blood Pressure Source Type: blogs
Fight Aging! publishes news and commentary relevant to the goal of ending all age-related disease, to be achieved by bringing the mechanisms of aging under the control of modern medicine. This weekly newsletter is sent to thousands of interested subscribers. To subscribe or unsubscribe from the newsletter, please visit: Longevity Industry Consulting Services Reason, the founder of Fight Aging! and Repair Biotechnologies, offers strategic consulting services to investors, entrepreneurs, and others interested in the longevity industry and its complexities. To find out m...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
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Source: Daily Express - Health - Category: Consumer Health News Source Type: news
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Source: Fight Aging! - Category: Research Authors: Tags: Daily News Source Type: blogs
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Source: Journal of Diabetes and Metabolic Disorders - Category: Endocrinology Source Type: research
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Source: Journal of Interventional Cardiac Electrophysiology - Category: Cardiology Source Type: research
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Source: American Journal of Hypertension - Category: Cardiology Authors: Tags: Am J Hypertens Source Type: research
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Source: Deutsches Arzteblatt International - Category: General Medicine Tags: Dtsch Arztebl Int Source Type: research
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