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- Effect on Malignant Phenotype of Gastric Cancer Cell Line after p53 Gene Transduction
- Sun Young Rha, Tae Soo Kim, Sook Jung Jeong, Joong Bae Ahn, kwang Yong Shim, Soo Jung Kong, Hwa Young Lee, Nae Choon Yoo, Jin Hyuk Choi, Ho Young Lim, Joo Young Lim, Jae Kyung Roh, Jin Sik Min, Byung Soo Kim, Hyun Cheol Chung
- J Korean Cancer Assoc. 1998;30(3):508-520.
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Abstract
PDF - PURPOSE
To evaluate the effect of wild type p53 gene transduction on the malignant phenotypes for metastasis in gastric cancer, we compared the biological phenpotypes of gastric cancer cell lines based on p53 gene status. Then, after retrovirus-mediated wild-type p53 gene transduction, we compared those phenotypes among parent YCC-3 cell line, vector transduced YCC-3v cell line and a clone of YCC-3C3. MATERIAL AND METHODS: Four human gastric cancer celi lines were used; YCC-l(mutant), YCC-2(wild), YCC-3(mutant) and AGS(wild). DNAs of the cell lines were analyzed to evaluate the mobility shift with PCR-SSCP. Tumorigenecity and proliferation were evaluated by soft agar assay and proliferation assay. Migratory capacity was measured by adhesion assay and Boyden chamber assay. p53 protein expression was measured by Western blot analysis and VEGF, WAF-1 were measured by ELISA assay. Angiogenic activity was measured by cross-feeding assay and cell cycle analysis was performed by flowcytometry. In vivo tumorigenicity was measured by xenograft in nude mice.
RESULTS
YCC-3 cell line with mutant p53 gene expressed all the phenotypes for the metastasis such as tumorigenicity, migration and angiogenesis. In a stable clone of YCC-3C3, no differences were found in proliferation, cell cycle and WAP-1 expression when compared to those of the control YCC-3v and parent YCC-3 cell line, even if increased p53 protein production was found by Western blot analysis. However, both in vitro and in vivo tumorigenicity were decreased in a stably transduced YCC-3C3 clone. The adhesive capacity was also decreased in YCC-3C3 clone whereas the endothelial cell growth stimulatory effect and VEGF production showed no difference compared to those of the YCC-3v cell line.
CONCLUSION
Wild-type p53 gene transduction in gastric cancer cell line decreased tumorigenicity which resulted from decreased colony forming activity and adhesive capacity but not formed changes of angiogenic activity. This suggested the possible application of anti- metastasis strategy with p53 gene therapy in gastric cancer.
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- Restoration of Wild - type p53 Induces Chemo-sensitization in the Gastric Cancer Cell Line with Mutant p53
- Ho Young Maeng, Sun Young Rha, Byung Soh Min, Yong Bae Kim, Hyun Joo Kwak, Tae Soo Kim, Kyu Hyun Park, Nae Choon Yoo, Ho Young Lim, Jin Hyuk Choi, Joo Hang Kim, Jae Kyung Roh, Jin Sik Min, Byung Soo Kim, Hyun Cheol Chung
- J Korean Cancer Assoc. 1998;30(3):497-507.
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Abstract
PDF
- PURPOSE
It has been theorized that p53 may be involved in the sensitivity to chemotherapeutic agents. We evaluated the chemosensitivity of wild p53 after transduction into gastric cancer cell lines with mutant p53.
MATERIALS AND METHODS
YCC-3(parent cell line with mutant p53), YCC-3v(parent cell line transduced with vector alone) and YCC-3C3(clone with wild p53) cell lines were used in this study. p53 protein expression was measured by ELISA assay. Tumorigenicity and drug sensitivity were evaluated by soft agar and proliferation assay, respectively. Cell cycle analysis was performed by flowcytometry. Telomerase activity was measured by TRAP assay and terminal restriction fragment(TRF) length was measured after Southern blot analysis.
RESULTS
Even though p53 production from the YCC-3C3 cell line was three times higher than those of YCC-3 and YCC-3v cell lines, the cell cycle was the same in these three cell lines. In the YCC-3C3 cell line, drug sensitivity to etoposide and cisplatin was increased when we compared it to those of the YCC-3v cell line(etoposide, 50% versus 83%; cisplatin, 67% versus 83%). However, there was no chemo-sensitization effect with vincristine, vinblastine and carboplatin. After exposure to cisplatin, a G0/G1 check-point effect was found in the YCC-3C3 cell line, but not in the YCC-3v cell line. No differences were found in telomerase activity, TRFs length or DNA fragmentation between the YCC-3v and YCC-3C3 cell lines after cisplatin treatment.
CONCLUSION
Wild-type p53 gene transduction in the gastric cancer cell line induced sensitization to the cytotoxicity of etoposide and cisplatin. This suggests the possible application of combined chemo-gene therapy with an EP regimen and wild-type p53 in gastric cancer patients with p53 mutation.
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- 22 Download
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