Abstract:
:HeLa (substrain Ho) grown in serum free medium showed an increase in the specific activity of alkaline phosphatase when fetal calf serum (10%) was added to the medium (9.7 nmoles/sec/mg protein to 86.8). Under the same conditions, eight intracellular enzymes showed no increase in activity. Similar results were obtained using a different serum or medium, and with a second strain of HeLa (substrain ATC). For a given set of growth conditions, the effect of serum was dependent on its concentration and required one or more culture generations to develop. The type of isozyme expressed did not change. Neither zinc nor a total serum lipid extract would substitute for serum. The enzyme expressed by HeLaHo was not induced by prednisolone, while that in HeLaATC was. However, for cells grown in excess prednisolone without serum, the specific activity was 25% of that found for cells grown with prednisolone and serum. Cortexolone, an antagonist of prednisolone, was without effect for HeLaHo grown in A3 medium with or without serum. The serum factor had the following characteristics. It was not lost on dialysis, treatment with DNase and RNase, or removal of lipoproteins. It was reduced after heating by 65% and after treatment with Pronase by 82%. The data are interpreted to indicate the presence of a factor (s) in serum, probably a protein, which is involved in stimulating alkaline phosphatase specific activity.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Carlson CWdoi
10.1002/jcp.1040980123subject
Has Abstractpub_date
1979-01-01 00:00:00pages
213-24issue
1eissn
0021-9541issn
1097-4652journal_volume
98pub_type
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