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Cancer Lett. 2000 Apr 3;151(1):31-8.

Interleukin-6 stimulates clonogenic growth of primary and metastatic human colon carcinoma cells.

Author information

1
Institute of Molecular Animal Breeding, Gene Center, Munich, Germany.

Abstract

Interleukin-6 (IL-6) is a pleiotropic cytokine which exerts biological activities on various cell types including neoplastic cells. We have investigated the biological effect of IL-6 and the expression of IL-6 receptors (IL-6R) on human colorectal carcinoma cell lines. Isreco-1 was derived from the primary site of a colon cancer while Isreco-2 and Isreco-3 were established from a liver and peritoneal metastasis of the same patient. IL-6 stimulated colony formation in methylcellulose of Isreco-1 cells to 150% (P < 0.05). The effect was even more pronounced on the metastatic Isreco-2 line where colony numbers in the presence of IL-6 were enhanced up to four-fold (P < 0.0001) in a dose-dependent fashion. An anti-IL-6 antibody completely abolished this growth stimulatory effect of IL-6. RT-PCR analysis revealed transcripts for IL-6Ralpha and gp 130 in these cell lines. Experiments with additional cell lines confirmed the general expression of gp130 but showed limited expression of the IL-6Ralpha chain. Surprisingly, about half of the cell lines tested expressed IL-6 mRNA at low levels which was not translated into protein. Our results suggest that IL-6 can potently stimulate anchorage-independent growth of some colorectal carcinoma cells. This stimulation appears to occur through a paracrine mechanism.

PMID:
10766420
DOI:
10.1016/s0304-3835(99)00401-2
[Indexed for MEDLINE]

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