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Involvement of Transforming Growth Factor ß1 in Autocrine Enhancement of Gelatinase B Secretion by Murine Metastatic Colon Carcinoma Cells¹

Pathophysiology Unit, Aichi Cancer Center Research Institute, Chikusa-ku, Nagoya 464 [S. Sh., Y. N., K. Ko., S. H.]; Morinaga Institute of Biological Science, Tsurumiku, Yokohama 230 [K. Ku., S. T.]; Department of Morphology, Institute for Development, Aichi Human Service Center, Kasugai, Aichi 480-03 [S. Sa.]; and Department of Pathology, Fujita Health University, School of Medicine, Toyoake, Aichi 470-11 [M. M.], Japan

We have reported previously that highly metastatic LuM1 cells derived from colon carcinoma colon 26 secrete larger amounts of gelatinase B than NM11 cells with poor metastatic potential, and that an increase in this gelatinase B secretion can be induced by autocrine factors (Hyuga et al., Cancer Res., 54: 3611–3616, 1994). In the present study, a partial characterization was achieved by comparison of the autocrine factor preparation (fraction G) from serum-free medium conditioned with metastatic LuM1 cells with soluble factors known to stimulate gelatinase B secretion. Secretion of gelationase B by LuM1 cells was augmented by tumor necrosis factor , transforming growth factor ß1 (TGF-ß1), interleukin 1ß, or epidermal growth factor, and specific neutralizing antibodies abolished the induced increases. Platelet-derived growth factor and insulin-like growth factor 1 had no effect on gelatinase B secretion by LuM1 cells. The enhancement of gelatinase B secretion by fraction G was partially inhibited by the antibody to TGF-ß1. TGF-ß1 was detected in both active and latent forms in serum-free medium conditioned with LuM1 or NM11 cells, with the amount of TGF-ß1 higher in the former case. Gelatinase B secretion by LuM1 cells was enhanced by the addition of TGF-ß1 to the culture medium, but that by NM11 cells was not seriously affected, although the latter bound more of the factor. These results indicate the involvement of this growth factor in the autocrine stimulation of gelatinase B secretion by LuM1 cells. However, the autocrine factor effect was not fully explained by TGF-ß1 in the medium, and the involvement of some other unknown factor(s) was thus indicated.

¹ Supported in part by Special Coordination Funds of the Science and Technology Agency of the Japanese Government.

² To whom requests for reprints should be addressed, at Pathophysiology Unit, Aichi Cancer Center Research Institute, 1-1 Kanokodenn, Chikusa-ku, Nagoya 464, Japan.

Received 2/13/96. Accepted 5/10/96.

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