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Apparent Turnover of Subcellular Phospholipids in the Liver of Control and Vitamin A-deficient Rats¹

Department of Biochemistry, School of Medicine, West Virginia University, Morgantown, West Virginia 26506

The half-lives of phospholipids derived from microsomes, mitochondria and soluble fractions of livers from control and vitamin A-deficient rats after the administration of ¹⁴C-labeled choline, ethanolamine, glycerol, and palmitic acid have been determined. The half-lives of subcellular phospholipids from control animals labeled with either choline, glycerol or palmitic acid were statistically similar (22 to 36 hours), whereas those phospholipids labeled with ethanolamine had significantly shorter half-lives (14 to 16 hours). No significant differences were noted between the half-lives of phospholipids from control and deficient subcellular fractions.

KEY WORDS: • turnover • vitamin A • phospholipids • liver • subcellular fractions

¹ Support of this work by U. S. Public Health Service Grant AM-11597 is gratefully acknowledged.

Manuscript received 15 February 1972.