Changes in IP3 metabolism during skeletal muscle development in vivo and in vitro

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
M Angélica CarrascoEnrique Jaimovich

Abstract

We have investigated whether IP3 metabolism presents particular changes during critical stages of muscle development. With this aim, we have measured IP3 formation through phospholipase C activity, IP3 removal through IP3 5-phosphatase and IP3 3-kinase activities, as well as IP3 mass, during myogenesis in vivo and in vitro. In developing rat skeletal muscle, both IP3 3-kinase and 5-phosphatase activities were relatively constant from embryonary day 15, the earliest age studied to postnatal day 10; 5-phosphatase decreased upon further development. A transient, major increase in phospholipase C activity was evident at embryonary day 18 while a non-significant increase in IP3 mass was detected at this embrionary age. In rat skeletal muscle in primary culture, all enzyme activities as well as the mass of IP3 increased significantly in myotubes compared to myoblasts. Myotubes incubated with calcitonin gene-related peptide, responded with a transient increase in IP3 mass after 2 to 10 sec; the CGRP-induced increase being completely blocked by U-73122, a phospholipase C inhibitor. Furthermore, IP3 mass increased within 1 hr after exposure to differentiating agents of both RCMH cells, a line derived from normal human skeletal muscle, a...Continue Reading

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Citations

Dec 2, 2004·Brain Research. Brain Research Reviews·Roberto ArayaJuan C Sáez
Mar 3, 2005·Cell Research·Hui Jun Xia, Guang Yang
May 4, 2000·American Journal of Physiology. Cell Physiology·E JaimovichJ A Powell
Feb 18, 2010·American Journal of Physiology. Endocrinology and Metabolism·Wenyan NiuAmira Klip
Jul 14, 2000·American Journal of Physiology. Endocrinology and Metabolism·M EstradaE Jaimovich

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