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The tumor promoter 12‐0‐tetradecanoyl‐phorbol‐13‐acetate enhances the proliferative response of Balb/c‐3T3 cells to hormonal growth factors
Author(s) -
Frantz Christopher N.,
Stiles Charles D.,
Scher Charles D.
Publication year - 1979
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041000305
Subject(s) - dna synthesis , growth factor , epidermal growth factor , cell growth , thymidine , 3t3 cells , microbiology and biotechnology , fibroblast growth factor , stimulation , cell culture , tetradecanoylphorbol acetate , biology , chemistry , endocrinology , dna , biochemistry , signal transduction , protein kinase c , transfection , receptor , genetics
Stimulation of Balb/c‐3T3 cell growth by TPA requires factors found in serum. We examined the interaction between TPA and serum growth factors in the stimulation of cell growth. The number of cells synthesizing DNA (incorporating 3 H‐thymidine) within 24 to 30 hours after the addition of TPA and the growth factors to density‐inhibited Balb/c‐3T3 cultures in serum‐free medium was determined by autoradiography. With no additions or with TPA (30‐300 ng/ml) alone, only 3‐7% of cells synthesized DNA. However, TPA synergistically promoted DNA synthesis in combination with each of the defined serum growth fractions, platelet derived growth factor and platelet poor plasma. TPA also synergistically promoted DNA synthesis in combination with purified growth factors including fibroblast growth factor, insulin (10 −6 ‐10 −5 M), and epidermal growth factor. In all conditions, TPA enhancement of DNA synthesis also resulted in an increase in cell number. Because TPA synergistically enhanced the activity of each growth factor tested, it did not act identically to any of the growth factors.