phosphatidylinositol

L-α-Phosphatidylinositol (liver, bovine) (sodium) is a reagent used in biochemical reactions.

L-α-Phosphatidylinositol-4,5-bisphosphate ammonium is a reagent used in biochemical reactions.

Pinolenic acid is a polyunsaturated fatty acid found in Korean pine (Pinus orientalis) and maritime pine (Pinus pinaster) seed oils, which exhibit lipid-lowering properties. In transgenic mice expressing human ApoA1, a diet containing maritime pine seed oil (MPSO) reduced high-density lipoprotein and ApoA1 levels and diminished cholesterol efflux in vitro. Korean pine seed oil supplements may aid in reducing obesity by decreasing appetite, as evidenced by increased levels of satiety hormones CCK and GLP-1 and reduced desire to eat. Pinolenic acid, which is not metabolically converted to arachidonic acid, can lower arachidonic acid levels in the phosphatidylinositol fraction of HepG2 cells from 15.9% to 7.0%. The neutral, more lipophilic form of pinolenic acid is pinolenic acid ethyl ester.

D-myo-Inositol-4-phosphate (Ins(4)P1) is a member of the inositol phosphate (InsP) molecular family that play critical roles as small, soluble second messengers in the transmission of cellular signals. The most studied InsP, Ins(1,4,5)P3, is a second messenger produced in cells by phospholipase C (PLC)-mediated hydrolysis of phosphatidylinositol-4,5-diphosphate. Binding of Ins(1,4,5)P3 to its receptor on the endoplasmic reticulum results in opening of the calcium channels and an increase in intracellular calcium. Ins(4)P1 can be formed by dephosphorylation of Ins(1,4)P2 by inositol polyphosphate 1-phosphatase or dephosphorylated to inositol by inositol monophosphatase.

The phosphatidylinositol (PtdIns) phosphates represent a small percentage of total membrane phospholipids. However, they play a critical role in the generation and transmission of cellular signals. PtdIns-(4)-P1 (1,2-dioctanoyl) is a synthetic analog of natural phosphatidylinositol (PtdIns) featuring C8:0 fatty acids at the sn-1 and sn-2 positions. The compound contains the same inositol and diacylglycerol (DAG) stereochemistry as the natural compound. PtdIns-(4)-P1 can be phosphorylated to di- (PtdIns-P2; PIP2) and triphosphates (PtdIns-P3; PIP3). Hydrolysis of PtdIns-(4,5)-P2 by phosphoinositide (PI)-specific phospholipase C generates inositol triphosphate (IP3) and DAG which are key second messengers in an intricate biochemical signal transduction cascade.