Inositol triphosphateInositol triphosphate
, also called triphosphoinositol), together with diacylglycerol
, is a second messenger
molecule used in signal transduction
in biological cells. It is made by hydrolysis of phosphatidyl inositol, a phospholipid
that is located in the plasma membrane
, by phospholipase
Its main functions are to mobilize Ca2+ from storage organelles and to regulate cell proliferation and other cellular reactions. For example, in Drosophila, InsP3 is used for intracellular transduction of light recognition in eye cells.