RESUMO
Objective To study the expression of Oct4 gene, an embryonic stem cell marker, in cervical carcinoma cell lines and tissues for the purpose of finding the relationship between this gene and cervical cancer. Methods The expression of Oct4 in normal cervical tissues and cervical carcinoma tissue and cell lines was detected by the immunohistochemistry and RT-PCR. Results ① The expression of Oct4 mRNA in cervical carcinomas (73.3%, 22/30) was significantly higher (P<0.01) than that in normal cervical tissues (25%, 3/12); ② The rate of Oct4 protein expression in cervical cancer (53.7%, 22/41) was higher (P<0.01) than that in normal cervical tissues (7.7%, 1/13); ③ Oct4 protein was expressed in cervical carcinoma cell lines and primary tumorspheres. ④ The expression of Oct4 in tumorspheres was down-regulated during cell differentiation. Conclusion Our results imply that Oct4 may be one of the cervical cancer stem cell markers, but this still needs further research data to support.
RESUMO
Objective To determine the role of interleukin-8 (IL-8) produced by tumor induced fibroblasts in the development of cutaneous melanoma. Methods B16 melanoma cells induced L929 fibroblasts phenotype was transdifferentiated to myofibroblasts (MF) by co-culture in vitro. MF was monitored by morphology and immunophenotype for a-SMA. The level of IL-8 was detected by ELISA. The effect on B16 cell proliferation rate was estimated using MIT method in vitro. Melanoma implanting model was constructed in C57 mice. Results L929 MF phenotype could be modulated by B16 melanoma cells-derived transforming growth factor-β1 (TGF-β1) and elevated the levels of IL-8. L929 MF did not influence the B16 melanoma cells viability in vitro, but shortened the time of tumor formation and increased the incidence rates of tumors in C57 implanting model mice. Conclusion Fibroblasts can be activated by tumor cells and produce IL-8, which acts as an inflammatory cytokine promoting the development of cutaneous melanoma.
RESUMO
Oct4 gene,a member of POU transcription factor family,is expressed in embryonic stem(ES) cells and embryonic carcinoma(EC) cells,but not in cells of differentiated tissues.It plays a critical role in maintaining pluripotent and self-renewing state of embryonic stem cells.The molecular structure,function,regulation passageway and the relationship with tumors of Oct4 gene have been briefly reviewed.
