PHOSPHORYLATIONS OF MR 34,000 AND 40,000 PROTEINS BY PROTEIN KINASE-C IN MOUSE EPIDERMIS INVIVO
- 15 July 1988
- journal article
- research article
- Vol. 48 (14), 4018-4023
Abstract
Activation of protein kinase C (PKC) and the resulting phosphorylations of proteins in vivo were examined in mouse epidermis, a target tissue of tumor-promoting phorbol diesters, such as 12-O-tetradecanoylphorbol-13-acetate (TPA). Treatment of mouse skin with TPA caused rapid translocation of PKC from the cytosol to the membrane fraction of skin tissue, followed by its down regulation. Epidermal proteins were labeled locally with 32P using the ring-shaped forceps technique that economizes on the amount of 32P1 required. Treatment with TPA in vivo resulted in about 2-fold increases in the phosphorylations of epidermal proteins with molecular weights of 34,000 and 40,000 and isoelectric points of 4.7-5.1 and 5.2-6.2 (p34 and p40, respectively). The phosphorylations of these proteins were also stimulated by teleocidin B. Inhibitors of PKC, such as chlorpromazine, quercetin, and staurosporine inhibited these increases in phosphorylations of p34 and p40 on TPA treatment. Furthermore, p34 and p40 were phosphorylated by purified PKC in a cell-free system. These results indicate that p34 and p40 are phosphorylated by PKC in mouse epidermis in vivo and may be involved in tumor promotion.This publication has 34 references indexed in Scilit:
- In vitro phosphorylation of angiotensin analogs by tyrosyl protein kinases.Journal of Biological Chemistry, 1983
- PROTEIN-KINASE ACTIVITY ASSOCIATED WITH A PHORBOL ESTER RECEPTOR PURIFIED FROM MOUSE-BRAIN1983
- Phorbol diester receptor copurifies with protein kinase C.Proceedings of the National Academy of Sciences, 1983
- Calcium-activated, phospholipid-dependent protein kinase from rat brain. Subcellular distribution, purification, and properties.Journal of Biological Chemistry, 1982
- Direct activation of calcium-activated, phospholipid-dependent protein kinase by tumor-promoting phorbol esters.Journal of Biological Chemistry, 1982
- DEMONSTRATION OF INVIVO DNA-REPAIR SYNTHESIS IN MOUSE SKIN EXPOSED TO VARIOUS CHEMICAL CARCINOGENS1982
- Indole alkaloids: dihydroteleocidin B, teleocidin, and lyngbyatoxin A as members of a new class of tumor promoters.Proceedings of the National Academy of Sciences, 1981
- Transformation by Rous sarcoma virus: A cellular substrate for transformation-specific protein phosphorylation contains phosphotyrosineCell, 1980
- Studies on mechanism of action of anti-tumor-promoting agents: their specificity in two-stage promotion.Proceedings of the National Academy of Sciences, 1980
- INHIBITION OF 12-O-TETRADECANOYLPHORBOL-13-ACETATE-INDUCED ORNITHINE DECARBOXYLASE ACTIVITY IN MOUSE EPIDERMIS BY VITAMIN-A ANALOGS (RETINOIDS)1978