BACKGROUND. Apoptosis is induced by various anticancer agents or radiation through the tumor suppressor gene p53-dependent pathway and is also induced by other factors, including transforming growth factor-β1 (TGF-β1). In this study, the authors investigated whether TGF-β1 would induce apoptosis in gastrointestinal cancer cells, and its relation to the status of the p53 gene. METHODS. The induction of apoptosis by TGF-β1 was determined in 12 gastrointestinal cancer cell lines using DNA ladder formation. Status of the p53 gene was examined by sequencing of cDNA from p53 mRNA and expressions of TGF-β1 mRNA and TGF receptors I and II mRNAs were determined by Northern blot analysis and the reverse transcriptase-polymerase chain reaction analysis, respectively. RESULTS. Of 12 cell lines, wild-type p53 was present in 3 lines, point mutation was detected in 7 lines, and p53 mRNA was absent in 2 lines. TGF-β1 was expressed in all 12 lines, but both TGF receptors I and II were expressed in only 6 lines. Addition of TGF-β1 induced DNA ladder formation only in KATOIII cells, with deleted p53 mRNA, but expressed TGF receptors I and II. CONCLUSIONS. These findings show that TGF-β1, induces apoptosis in gastric cancer cells through TGF-β receptors I and II and a p53-independent pathway.
|Number of pages||6|
|Issue number||8 SUPPL.|
|Publication status||Published - Apr 15 1996|
All Science Journal Classification (ASJC) codes
- Cancer Research