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. 1988 Jan;85(2):612–616. doi: 10.1073/pnas.85.2.612

Tumor promoter-induced membrane-bound protein kinase C regulates hematogenous metastasis.

R Gopalakrishna 1, S H Barsky 1
PMCID: PMC279601  PMID: 3422445

Abstract

A strong correlation was found between the basal levels of membrane-bound protein kinase C and the ability of B16 melanoma cell sublines (F10, F1, and BL6) to metastasize to the lung after intravenous injection. By treating with tumor-promoting phorbol esters for 1 hr, the low-metastasizing F1 cells exhibited both translocation of protein kinase C from cytosol to plasma membrane and an increase in metastasis to a level comparable to the (untreated) highly metastatic subline F10. Prolonged treatment of melanoma sublines with phorbol 12-myristate 13-acetate for 24 hr resulted in both inactivation of protein kinase C activity and loss of their metastasizing capabilities. Under conditions that induced only the activation of protein kinase C but not its membrane association, no increase in metastasis occurred, suggesting that activation of protein kinase C alone is insufficient to promote metastasis and that its membrane association is also necessary. Exposure of B16 melanoma sublines to phorbol esters for 1 hr had (i) no effect on the growth and morphology of these cells in vivo and in vitro and (ii) a short-term effect (approximately equal to 5 hr) on membrane association of protein kinase C. Nonetheless, in this period, the membrane-bound protein kinase C, probably by influencing cell-surface and cell-attachment properties, increased the retention of circulating melanoma cells in the lung, which eventually led to an increased number of metastatic nodules. The membrane-bound protein kinase C activity also correlated with metastatic ability in rapidly growing cells, growth-arrested cells, and cells growing in a low-Ca2+ medium. The results strongly suggest that the membrane-bound protein kinase C influences hematogenous metastasis of tumor cells and show that tumor promoters like phorbol esters have an additional role in promoting hematogenous spread of cancer in the body.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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