Premium
Triglyceride synthesis from dihydroxyacetone phosphate and palmitate by microsomes from mammary glands of lactating mice
Author(s) -
Ananda Rao G.,
Abraham S.
Publication year - 1978
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02533374
Subject(s) - lipidology , clinical chemistry , dihydroxyacetone phosphate , dihydroxyacetone , triglyceride , microsome , medicine , endocrinology , chemistry , lactation , mammary gland , biochemistry , glycerol , phosphate , biology , cholesterol , enzyme , pregnancy , genetics , cancer , breast cancer
Both di‐ and triglycerides were synthesized when microsomes isolated from mammary glands of lactating mice were incubated with dihydroxyacetone phosphate (DHAP), (1‐ 14 C)palmitate, ATP, CoASH, GSH, KF, MgCl 2 , and NADPH. When NADH replaced NADPH, glyceride synthesis was very low. In the absence of either NADPH or NADH, DHAP was acylated to palmityl‐DHAP. Since microsomes do not have glycerol 3‐phosphate NAD:oxidoreductase activity, we inferred that glycerol 3‐phosphate (GP) is not an intermediate in triglyceride biosynthesis from DHAP. This reductase, present in the cytosol, was active only with NADH. With the same concentration of either GP or DHAP, microsomes yielded essentially similar amounts of di‐ and triglycerides. Mitochondria, while capable of synthesizing palmityl‐DHAP, did not produce di‐ and triglycerides.