Abstract：
:Biologically active phorbol ester derivatives displace [3H]phorbol-12, 13-dibutyrate from thioglycollate-elicited mouse peritoneal macrophages in a time-, temperature-, and concentration-dependent manner. Scatchard analysis revealed an apparent Kd of 54.1 nM and 8.0 X 10(5) sites/cell, indicating that these macrophages possess saturable, high-affinity phorbol ester-binding sites. These derivatives also act as chemoattractants for the macrophage at equivalent concentrations. A notable exception to this pattern is phorbol-12,13-diacetate. Phorbol-12,13-diacetate inhibits specific binding of [3H]phorbol-12,13-dibutyrate (concentration required for a 50% inhibition of the maximum specific binding of [3H]phorbol-12,13-dibutyrate, 2.6 microM) and chemotaxis to phorbol-12-myristate, 13-acetate (concentration required for a 50% inhibition of the maximum chemotactic response, 0.39 microM) while exhibiting no activity as a chemoattractant at concentrations up to 10(-5) M. The data indicate that phorbol-12,13-diacetate may be an antagonist for receptor-mediated chemotaxis to phorbol-12-myristate, 13-acetate in the macrophage.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Sturm RJ,Smith BM,Lane RW,Laskin DL,Harris LS,Carchman RAsubject
Has Abstractpub_date
1983-10-01 00:00:00pages
4552-6issue
10eissn
0008-5472issn
1538-7445journal_volume
43pub_type
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