Abstract
Increased endocytosis inTetrahymena pyriformis, produced by presenting starved cells with either peptone-yeast extract medium or killed yeast cell suspension, results in increased cellular acid phosphatase activity.Tetrahymena, grown in peptone-yeast extract medium, showed increased acid phosphatase activity after phagocytosis of yeast cells. This increase was not apparent until about one hour after presentation and was maximal at about 2.5 hours.Tetrahymena, grown on yeast suspension, showed little increase in acid phosphatase activity on presentation with peptone-yeast extract medium. These results may indicate that endocytosis, of either particles or solutes, produces an adaptive increase in acid phosphatase activity (presumably lysosomal in nature) which is related to feeding.
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