Intracellular actions of vitamin A.
Because the effects of vitamin A vary with tissue type and often with the form of vitamin A itself, a complete understanding of the mechanism(s) of action still has not been attained. The action of vitamin A may be at the level of genomic expression, at the membrane level, or both. Intercellular and intracellular transport of vitamin A are facilitated by specific binding proteins but probably not in the cellular uptake of vitamin A. Subcellularly, vitamin A may exert a direct effect on transit through the Golgi apparatus, as observed from both biochemical and morphological studies. In my laboratory, recent work using cell-free systems has shown that retinol stimulates transition vesicle formation from endoplasmic reticulum in a GTP-requiring step.
Morré
D M
DM
Department of Foods and Nutrition, Purdue University, West Lafayette, Indiana 47907.
D000818:Animals; D006801:Humans; D007424:Intracellular Fluid; D014801:Vitamin A
D014801:Vitamin A