Inositol’s Role in Membrane Structure and Second‑Messenger Generation

Structural Function of Inositol

• Inositol is incorporated into cell membranes as phosphatidylinositol (PI), serving both as a structural lipid component and as the precursor for intracellular signaling cascades. 1

Second‑Messenger Production

• Phosphatidylinositol‑4,5‑bisphosphate (PtdIns(4,5)P₂) is enzymatically cleaved to produce inositol‑1,4,5‑trisphosphate (IP₃) and diacylglycerol (DAG), which act as essential second messengers for calcium signaling and protein kinase C activation. 2