TrkB expression at the neuromuscular junction is reduced during aging.

Abstract:

INTRODUCTION:Full-length tyrosine kinase B (TrkB.FL) and truncated TrkB (TrkB.t1) receptors are colocalized with acetylcholine receptors (AChRs) at the neuromuscular junction. We have recently shown that reduced TrkB expression leads to age-related alterations in AChR structure, neurotransmission failure, and muscle weakness. METHODS:We investigated whether TrkB expression is reduced in the soleus muscle during aging. RESULTS:TrkB protein expression was decreased in senescent (24-month-old) compared with 3-12-month-old mice. Loss of TrkB expression was concurrent with age-related changes in AChR morphology. Changes in mRNA levels did not correlate with protein expression, because TrkB.FL copy number was increased in the senescent soleus. No change was seen in TrkB.t1 levels. CONCLUSIONS:The results suggest that reduced TrkB expression during aging may result from reduced TrkB.FL mRNA translation or increased TrkB protein turnover. Thus, maintaining adequate TrkB signaling is a potential therapeutic tool to improve muscle function during senescence.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Personius KE,Parker SD

doi

10.1002/mus.23616

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

532-8

issue

4

eissn

0148-639X

issn

1097-4598

journal_volume

47

pub_type

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