Heterogeneity of Acid Phosphatase in the Human Diploid Cell Strain WI-38.

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Abstract
A subcellular fraction was prepared from human diploid cell strain WI-38 with the characteristics of lysosomes: this fraction contains the greatest percentage of acid phosphatase activity and in terms of specific activity is enriched over the whole homogenate. The activity is sedimentable and membrane-bound and, once released by a detergent, is no longer sedimentable. Two forms of acid phosphatase exist in WI-38 cells based on differences in subcellular localization, pH optimum, sensitivity to inhibitors, thermal stability and electrophoretic mobility.