首页 | 本学科首页   官方微博 | 高级检索  
   检索      


The levels of both lipid rafts and raft-located acetylcholinesterase dimers increase in muscle of mice with muscular dystrophy by merosin deficiency
Authors:María Teresa Moral-Naranjo  María Fernanda Montenegro  Encarnación Muñoz-Delgado  Francisco J Campoy  Cecilio J Vidal
Institution:Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Murcia, Spain
Abstract:Wild type and dystrophic (merosin-deficient) Lama2dy mice muscles were compared for their density of lipid rafts. The 5-fold higher level of caveolin-3 and the 2-3 times higher level of ecto-5’-nucleotidase activity in raft preparations (Triton X-100-resistant membranes) of dystrophic muscle supported expansion of caveolar and non-caveolar lipid rafts. The presence in rafts of glycosylphosphatidylinositol (GPI)-linked acetylcholinesterase (AChE) dimers, which did not arise from erythrocyte or nerve, not only revealed for the first time the capacity of the myofibre for translating the AChE-H mRNA but also an unrecognized pathway for targeting AChE-H to specialized membrane domains of the sarcolemma. Rafts of dystrophic muscle contained a 5-fold higher AChE activity/mg protein. RT-PCR for 3’-alternative mRNAs of AChE revealed AChE-T mRNA prevailing over AChE-R and AChE-H mRNAs in wild type mouse muscle. It also displayed principal 5’-alternative AChE mRNAs with exons E1c and E1e (the latter coding for N-terminally extended subunits) and fewer with E1d, E1a and E1b. The levels of AChE and butyrylcholinesterase mRNAs were unaffected by dystrophy. Finally, the decreased level of proline-rich membrane anchor (PRiMA) mRNA in Lama2dy muscle provided for a rational explanation to the loss of PRiMA-bearing AChE tetramers in dystrophic muscle.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号