Triglyceride biosynthesis pathway (TG biosynthesis pathway)

The triglyceride biosynthesis pathway is a complex metabolic process responsible for the synthesis of triglycerides, which are the main storage form of energy in the body. The pathway primarily occurs in the endoplasmic reticulum of cells, with newly synthesized triglycerides being channeled into cytosolic lipid droplets or incorporated into lipoproteins for secretion. The most prominent pathway is the glycerol-3-phosphate (Kennedy) pathway, which accounts for over 90% of triglyceride synthesis in the liver. This pathway involves the sequential acylation of glycerol-3-phosphate, with the final and only committed step catalyzed by DGAT enzymes. The dihydroxyacetone phosphate pathway is particularly important in adipocytes, while the monoacylglycerol pathway predominates in intestinal cells processing dietary fats. The regulation of triglyceride synthesis is tightly controlled at both cellular and organ levels, involving transcription factors like SREBPs and PPARs that coordinate gene expression based on metabolic needs. Dysregulation of this pathway is implicated in various metabolic disorders, making it an important therapeutic target for conditions like obesity, dyslipidemia, and fatty liver disease.

Other names

Triacylglycerol biosynthesis pathwayTAG biosynthesis pathwayKennedy pathwayGlycerol phosphate pathway

Inhibition of key enzymes (particularly DGAT enzymes) - Modulation of transcription factors that regulate lipid metabolism (PPARs, SREBPs) - Alteration of substrate availability