Abstract
Transforming growth factor-beta (TGF-beta), a multifunctional cytokine, exerts contradictory roles in different kinds of cells. A number of studies have revealed its involvement in the progression of many types of tumors. To investigate the effect of TGF-beta on gastric carcinoma, SGC7901, BGC823 and MKN28 (a TGF-beta-resistant cell line) adenocarcinoma clones were used. After pretreatment in serum-free medium with or without 10 ng/ml TGF-beta1, their experimental metastatic potential, chemotaxis, and invasive and adhesive ability were measured. Furthermore, zymography for gelatinase was processed. Liver colonies were also measured 4 weeks after inoculation of SGC7901, BGC823 and MKN28 in Balb/c nude mice, and an increase in the number of surface liver metastases was seen in SGC7901 (from 11.0+/-3.0 to 53.3+/-3.3) and BGC823 (from 9.3+/-2.5 to 60.0+/-2.8) groups, whereas there was no difference between MKN28 groups (from 35.2+/-3.8 to 38.5+/-2.7). In vitro experiments showed that TGF-beta1 increased the adhesion capacity of SGC7901 and BGC823 cells to immobilized reconstituted basement membrane/fibronectin matrices and promoted their penetration through reconstituted basement membrane barriers. Zymography demonstrated that enha...Continue Reading
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