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ECB-ART-32845
Biochem J 1986 Dec 15;2403:917-20. doi: 10.1042/bj2400917.
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Micro-injection of inositol 1,3,4,5-tetrakisphosphate activates sea urchin eggs by a mechanism dependent on external Ca2+.

Irvine RF , Moor RM .


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Micro-injection of submicromolar concentrations of inositol 1,3,4,5-tetrakisphosphate caused a raising of the fertilization envelope in eggs of the sea urchin Lytechinus variegatus. This effect was dependent both on the presence of extracellular Ca2+ and on co-injection with a Ca2+-mobilizing compound, inositol 2,4,5-trisphosphate. Inositol 1,3,4,5-tetrakisphosphate was the most potent compound tested in this assay; removal of the 3- or 5-phosphates or randomization of the phosphates in the inositol ring decreased its potency. These results show that inositol 1,3,4,5-tetrakisphosphate is an intracellular second messenger, and suggest that its function is to control cellular Ca2+ homoeostasis at the plasma membrane.

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Genes referenced: LOC100887844

References [+] :
Batty, Rapid formation of inositol 1,3,4,5-tetrakisphosphate following muscarinic receptor stimulation of rat cerebral cortical slices. 1985, Pubmed