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Inositol Trisphosphate and Calcium Mobilization

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Inositol and Phosphoinositides

Part of the book series: Experimental Biology and Medicine ((EBAM,volume 6))

Summary

Receptors that mobilize calcium stimulate the hydrolysis of phosphoinositides. Addition of 5-HT to the fly salivary gland causes the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2). The resulting increases in inositol 1,4,5-trisphosphate (IP3) and inositol 1,4-bisphosphate (I P2) that begin to accumulate with no apparent delay is fast enough to account for the calcium-dependent component of the physiological response. In contrast, the levels of inositol 1-phosphate (I P) and free inositol begin to rise with lag periods of 20 and 60 seconds respectively. This analysis of how fast these inositol phosphates accumulate following stimulation is consistent with the idea that the primary action of hormones is to hydrolyse PIP2 to diacylglycerol and IP3. The idea that IP3 may function as a second messenger to mobilize intracellular calcium has been supported by observations on pancreatic and liver cells with ‘leaky’ plasma membranes. Addition of IP3 in the micromolar range induces a release of calcium from an internal membrane pool that is most likely located in the endoplasmic reticulum. The effect of IP3 appears to be specific in that there was no release in response to IP2, IP or inositol 1,2-cyclic phosphate. It is proposed that the IP3 might be the long sought-after second messenger that functions to mobilize intracellular calcium.

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© 1985 The Humana Press Inc.

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Berridge, M.J., Irvine, R.F. (1985). Inositol Trisphosphate and Calcium Mobilization. In: Bleasdale, J.E., Eichberg, J., Hauser, G. (eds) Inositol and Phosphoinositides. Experimental Biology and Medicine, vol 6. Humana Press. https://doi.org/10.1007/978-1-4612-5184-2_23

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  • DOI: https://doi.org/10.1007/978-1-4612-5184-2_23

  • Publisher Name: Humana Press

  • Print ISBN: 978-1-4612-9602-7

  • Online ISBN: 978-1-4612-5184-2

  • eBook Packages: Springer Book Archive

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