Effects of 5-Aza-CdR on cell proliferation of breast cancer cell line MDA-MB-435S and expression of maspin gene.
The effects of 5-Aza-2'-deoxycytidine (5-Aza-CdR) on the proliferation of MDA-MB-435S cells and the expression of tumor suppressor gene maspin were investigated. Human breast cancer cell line MDA-MB-435S was treated with 5 micromol/L 5-Aza-CdR, a specific demethylating agent for 0 to 8 days. The growth of MDA-MB-435S cells was observed by MTT assay before and after 5-Aza-CdR treatment, respectively. The expression of maspin mRNA was detected by reverse transcription-polymerase chain reaction (RT-PCR). The cell cycle of MDA-MB-435S cells was analyzed by flow cytometry. The results showed that the growth of MDA-MB-435S cells treated with 5-Aza-CdR for 8 days was significantly suppressed as compared with the control groups, and the inhibition rate increased sharply from 5 day to 8 day (35.42% to 71.29%). Flow cytometry showed that 5 micromol/L 5-Aza-CdR could induce G(2)/M cell cycle arrest and decrease the percentage of mitosis cell number in this cell line. Maspin mRNA was expressed in MDA-MB-435S cells after 5-Aza-CdR treatment, but it was weakly detectable before the treatment. It was concluded that Maspin gene might be transcriptional silencing by hypermethylation and the re-expression of maspin gene by 5-Aza-CdR can inhibit the proliferation and induce the G2/M arrest of MDA-MB-435S breast cancer cells.
Department of General Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. union.bzhang@yahoo.com.cn
Bo
B
Zhang
Tao
T
Huang
Ke
K
Liu
Jianying
J
Chen
Guobin
G
Wang
D000964:Antimetabolites, Antineoplastic / Q000494:pharmacology*; D001374:Azacitidine / Q000031:analogs & derivatives* / Q000494:pharmacology; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D000077209:Decitabine; D005260:Female; D006801:Humans; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015843:Serpins / Q000235:genetics / Q000378:metabolism*
D000964:Antimetabolites, Antineoplastic; D012333:RNA, Messenger; C085344:SERPIN-B5; D015843:Serpins; D000077209:Decitabine; D001374:Azacitidine