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Journal of Cell Science, Vol 108, Issue 1 7-15, Copyright © 1995 by Company of Biologists
JOURNAL ARTICLES |
T Fujimoto, A Miyawaki and K Mikoshiba
Department of Anatomy, Graduate School of Medicine, Kyoto University, Japan.
We reported that a plasmalemmal inositol 1,4,5-trisphosphate receptor-like protein (PM InsP3R-L) is localized in caveolae of various non-neuronal cells in vivo (Fujimoto et al. (1992) J. Cell Biol. 119, 1507-1513). In the present study, we investigated the distribution of PM InsP3R-L in cultured cells. In mouse epidermal keratinocytes (Pam 212) cultured in standard Ca2+ (1.8 mM), PM InsP3R-L was distributed densely in the vicinity of cell-to-cell contacts. In contrast, when Pam cells were cultured in low Ca2+ (0.06 mM) without making cell-to-cell contacts, PM InsP3R-L was observed randomly; by restoring the Ca2+ concentration, the circumferential actin filaments became obvious and the density of PM InsP3R-L increased in the contact region. Treatment of Pam cells with cytochalasin D caused aggregation of caveolae where PM InsP3R-L as well as F-actin and fodrin were localized. In bovine aortic endothelial cells, PM InsP3R-L was aligned along actin filaments crossing the cytoplasm in various directions. PM InsP3R-L of Pam cells was hardly extracted by treatment with 0.5% Triton X-100 or 60 mM octyl-glucoside in a cytoskeleton-stabilizing buffer for 15 minutes at 4 degrees C. The results show that the distribution of caveolae bearing PM InsP3R-L changes when the actin cytoskeleton is modified. They also indicate that the association of PM InsP3R-L with actin filaments may mediate the redistribution of caveolae. Since caveolae are thought to be related to signal transduction, their location defined by the actin cytoskeleton may affect the site where cellular reaction is to occur in response to various stimuli.
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