Inhibition of phorbol myristate acetate and phytohemagglutinin stimulation of human lymphocytes by retinol

Retinol (vitamin A) in concentrations above (5 microgram/ml inhibits the stimulation of human lymphocytes by phytohemagglutinin and phorbol myristate acetate. This is in contrast to bovine lymphocytes in which retinol inhibits only phorbol myristate acetate stimulation of lymphocytes. The cause of t...

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Veröffentlicht in:	Cancer research (Chicago, Ill.) Ill.), 1979-09, Vol.39 (9), p.3332
Hauptverfasser:	Skinnider, L F, Giesbrecht, K
Format:	Artikel
Sprache:	eng
Schlagworte:	Dose-Response Relationship, Drug Humans In Vitro Techniques Lymphocyte Activation - drug effects Lymphocytes - drug effects Phorbols - antagonists & inhibitors Phytohemagglutinins - antagonists & inhibitors Tetradecanoylphorbol Acetate - antagonists & inhibitors Vitamin A - pharmacology
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Zusammenfassung:	Retinol (vitamin A) in concentrations above (5 microgram/ml inhibits the stimulation of human lymphocytes by phytohemagglutinin and phorbol myristate acetate. This is in contrast to bovine lymphocytes in which retinol inhibits only phorbol myristate acetate stimulation of lymphocytes. The cause of the inhibition does not appear to be due to a direct toxic action because the viability and ultrastructure of lymphocytes exposed to a concentration of 20 microgram/ml for 72 hr were normal. The mechanism of action of the retinol is not known, but it may be mediated by a retinol-binding protein in the cells.
ISSN:	0008-5472