Abstract:
:It is now well established that stromal interaction molecule 1 (STIM1) is the calcium sensor of endoplasmic reticulum stores required to activate store-operated calcium entry (SOC) channels at the surface of non-excitable cells. However, little is known about STIM1 in excitable cells, such as striated muscle, where the complement of calcium regulatory molecules is rather disparate from that of non-excitable cells. Here, we show that STIM1 is expressed in both myotubes and adult skeletal muscle. Myotubes lacking functional STIM1 fail to show SOC and fatigue rapidly. Moreover, mice lacking functional STIM1 die perinatally from a skeletal myopathy. In addition, STIM1 haploinsufficiency confers a contractile defect only under conditions where rapid refilling of stores would be needed. These findings provide insight into the role of STIM1 in skeletal muscle and suggest that STIM1 has a universal role as an ER/SR calcium sensor in both excitable and non-excitable cells.
journal_name
Nat Cell Bioljournal_title
Nature cell biologyauthors
Stiber J,Hawkins A,Zhang ZS,Wang S,Burch J,Graham V,Ward CC,Seth M,Finch E,Malouf N,Williams RS,Eu JP,Rosenberg Pdoi
10.1038/ncb1731subject
Has Abstractpub_date
2008-06-01 00:00:00pages
688-97issue
6eissn
1465-7392issn
1476-4679pii
ncb1731journal_volume
10pub_type
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