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• W1992814187 abstract "The precise localization and role of inositol 1,4,5-trisphosphate (InsP 3 ) receptors (InsP 3 Rs) in cardiac muscle cells are largely unknown. It is believed that waves and oscillations in cytosolic free calcium triggered by activation of InsP 3 Rs underlie modifications of cellular responses that lead to changes in gene expression in other cells. However, how changes in cytosolic calcium alter gene expression in cardiac cells is unknown. Moreover, it is unclear how changes in cytosolic calcium that alter gene expression do so independently of effects of calcium on other cellular functions, such as contraction. Here we show that InsP 3 R type 2 is the only isoform present in cardiac myocytes isolated from neonatal mouse ventricles. We also show that type 2 InsP 3 Rs are associated with the nucleus and that activation of type 2 InsP 3 Rs with endothelin-1 or phenylephrine selectively increases transcription of atrial natriuretic factor and skeletal α-actin. Type 2 InsP 3 Rs are also in striations. Activation of InsP 3 Rs with adenophostin A in permeabilized cells induced calcium release in the nuclear domain and other regions of the cell away from the nucleus. Agonist-induced increase in gene expression and calcium release were blocked by the InsP 3 R inhibitors 2-aminoethoxydiphenyl borate and xestospongin C. The spatial separation of type 2 InsP 3 Rs provides support for the concept that microdomains of calcium discretely alter various cell processes. Our experiments suggest that calcium released by InsP 3 Rs in the nuclear domain provides a direct mechanism for the control of gene expression, whereas release of calcium in the cytoplasm may modulate other processes, such as contraction." @default.
• W1992814187 created "2016-06-24" @default.
• W1992814187 creator A5031786575 @default.
• W1992814187 creator A5044301311 @default.
• W1992814187 creator A5062848374 @default.
• W1992814187 date "2004-10-01" @default.
• W1992814187 modified "2023-09-27" @default.
• W1992814187 title "Immunolocalization of type 2 inositol 1,4,5-trisphosphate receptors in cardiac myocytes from newborn mice" @default.
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• W1992814187 doi "https://doi.org/10.1152/ajpcell.00004.2004" @default.
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