Abstract
Both di- and triglycerides were synthesized when microsomes isolated from mammary glands of lactating mice were incubated with dihydroxyacetone phosphate (DHAP), (1-14C)palmitate, ATP, CoASH, GSH, KF, MgCl2, 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.
Similar content being viewed by others
References
Rao, G.A., and S. Abraham, Lipids 10:409 (1975).
LaBelle, E.F., Jr., and A.K. Hajra, J. Biol. Chem. 247:5825 (1972).
Patton, S., and R.G. Jensen, in “Progress in the Chemistry of Fats and Other Lipids,” Vol. 14, Edited by R.T. Holman, Pergamon Press, Oxford, England, 1975, pp. 224–228.
Rao, G.A., and S. Abraham, J. Am. Oil Chem. Soc. 53:149A (1976), Abstr. 110.
Rao, G.A., and S. Abraham, Lipids 9:269 (1974).
Tanioka, H., C.Y. Lin, S. Smith, and S. Abraham, Lipids 9:229 (1974).
Hajra, A.K., J. Biol. Chem. 243:3458 (1968).
Wiegand, R.D., G.A. Rao, and R. Reiser, J. Nutr. 103:1414 (1973).
LaBelle, E.F., Jr., and A.K. Hajra, J. Biol. Chem. 247:5835 (1972).
Rao, G.A., M.F. Sorrels, and R. Reiser, Lipids 6:88 (1971).
Rao, G.A., M.F. Sorrels, L.E. Puleo, and R. Reiser, Fed. Proc. 28:596 (1969).
Hajra, A.K., E.B. Seguin, and B.W. Agranoff, J. Biol. Chem. 243:1609 (1968).
Brown, J.L., and J.M. Johnston, J. Lipid Res. 3:480 (1962).
Johnston, J.M., G.A. Rao, P.A. Lowe, and B.E. Schwarz, Lipids 2:14 (1967).
Hajra, A.K., Biochem. Biophys. Res. Commun. 33:929 (1968).
“Methods of Enzymatic Analysis,” Edited by H.U. Bergmeyer, Academic Press, New York and London, 1965.
Beisenherz, G., T. Bucher, and K.H. Garbade, in “Methods in Enzymology,” Vol. 1, Academic Press, New York, NY, 1955, p. 391.
Lowry, O.H., M.J. Rosenbrough, A.L. Farr, and R.J. Randall, J. Biol. Chem. 193:265 (1951).
Rao, G.A., and J.M. Johnston Biochim. Biophys. Acta 125:465 (1966).
Rao, G.A., M.F. Sorrels, and R. Reiser, Lipids 5:762 (1970).
Pollock, R.J., A.K. Hajra, and B.W. Agranoff, Biochim. Biophys. Acta 380:421 (1975).
Lamb, R.G., and H.J. Fallon, J. Lipid Res. 17:406 (1976).
Vavrecka, M., M.P. Mitchell, and G. Hubscher, Biochem. J. 115:139 (1969).
Rao, G.A., and S. Abraham, Lipids 8:232 (1973).
Rao, G.A., M.F. Sorrels, and R. Reiser, Biochem. Biophys. Res. Commun. 44:1279 (1971).
Author information
Authors and Affiliations
About this article
Cite this article
Ananda Rao, G., Abraham, S. Triglyceride synthesis from dihydroxyacetone phosphate and palmitate by microsomes from mammary glands of lactating mice. Lipids 13, 95–98 (1978). https://doi.org/10.1007/BF02533374
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02533374