Abstract:
AIM:To evaluate the role of RARalpha gene in mediating the growth inhibitory effect of all-trans retinoic acid (ATRA) on gastric cancer cells. METHODS:The expression levels of retinoic acid receptors (RARs) in gastric cancer cells were detected by Northern blot. Transient transfection and chlorophenicol acetyl transferase (CAT) assay were used to show the transcriptional activity of beta retinoic acid response element (betaRARE) and AP-1 activity. Cell growth inhibition was determined by MTT assay and anchorage-independent growth assay, respectively. Stable transfection was performed by the method of Lipofectamine, and the cells were screened by G418. RESULTS:ATRA could induce expression level of RARalpha in MGC80-3, BGC-823 and SGC-7901 cells obviously, resulting in growth inhibition of these cell lines. After sense RARalpha gene was transfected into MKN-45 cells that expressed rather low level of RARalpha and could not be induced by ATRA, the cell growth was inhibited by ATRA markedly. In contrast, when antisense RARalpha gene was transfected into BGC-823 cells, a little inhibitory effect by ATRA was seen, compared with the parallel BGC-823 cells. In transient transfection assay, ATRA effectively induced transcriptional activity of betaRARE in MGC80-3, BGC-823, SGC-7902 and MKN/RARalpha cell lines, but not in MKN-45 and BGC/aRARalpha cell lines. Similar results were observed in measuring-antiAP-1 activity by ATRA in these cancer cell lines. CONCLUSION:ATRA inhibits the growth of gastric cancer cells by up-regulating the level of RARalpha RARalpha is the major mediator of ATRA action in gastric cancer cells; and adequate level of RARalpha is required for ATRA effect on gastric cancer cells.
journal_name
World J Gastroenteroljournal_title
World journal of gastroenterologyauthors
Liu S,Wu Q,Chen ZM,Su WJdoi
10.3748/wjg.v7.i5.662keywords:
subject
Has Abstractpub_date
2001-10-01 00:00:00pages
662-6issue
5eissn
1007-9327issn
2219-2840journal_volume
7pub_type
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journal_title:World journal of gastroenterology
pub_type: 杂志文章,评审
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pub_type: 杂志文章
doi:10.3748/wjg.v12.i27.4304
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pub_type: 杂志文章,评审
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2005-08-21 00:00:00
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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更新日期:2005-09-14 00:00:00
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pub_type: 杂志文章
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journal_title:World journal of gastroenterology
pub_type: 杂志文章
doi:10.3748/wjg.v20.i15.4335
更新日期:2014-04-21 00:00:00
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journal_title:World journal of gastroenterology
pub_type: 杂志文章
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更新日期:2005-06-14 00:00:00
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journal_title:World journal of gastroenterology
pub_type: 杂志文章
doi:10.3748/wjg.v10.i16.2361
更新日期:2004-08-15 00:00:00
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journal_title:World journal of gastroenterology
pub_type: 杂志文章
doi:10.3748/wjg.v19.i32.5347
更新日期:2013-08-28 00:00:00