Simulations of inositol phosphate metabolism and its interaction with InsP3-mediated calcium release

Mishra, Jyoti ; Bhalla, Upinder S. (2002) Simulations of inositol phosphate metabolism and its interaction with InsP3-mediated calcium release Biophysical Journal, 83 (3). pp. 1298-1316. ISSN 0006-3495

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00063...

Related URL: http://dx.doi.org/10.1016/S0006-3495(02)73901-5

Abstract

Inositol phosphates function as second messengers for a variety of extracellular signals. Ins(1,4,5)P3 generated by phospholipase C-mediated hydrolysis of phosphatidylinositol bisphosphate, triggers numerous cellular processes by regulating calcium release from internal stores. The Ins(1,4,5)P3 signal is coupled to a complex metabolic cascade involving a series of phosphatases and kinases. These enzymes generate a range of inositol phosphate derivatives, many of which have signaling roles of their own. We have integrated published biochemical data to build a mass action model for InsP3 metabolism. The model includes most inositol phosphates that are currently known to interact with each other. We have used this model to study the effects of a G-protein coupled receptor stimulus that activates phospholipase C on the inositol phosphates. We have also monitored how the metabolic cascade interacts with Ins(1,4,5)P3-mediated calcium release. We find temporal dynamics of most inositol phosphates to be strongly influenced by the elaborate networking. We also show that Ins(1,3,4,5)P4 plays a key role in InsP3 dynamics and allows for paired pulse facilitation of calcium release. Calcium oscillations produce oscillatory responses in parts of the metabolic network and are in turn temporally modulated by the metabolism of InsP3.

Item Type:Article
Source:Copyright of this article belongs to Biophysical Society.
ID Code:4408
Deposited On:18 Oct 2010 14:09
Last Modified:16 May 2011 15:48

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