Abstract:
:We identified IFIX as a new member of the hematopoietic interferon (IFN)-inducible nuclear protein with the 200-amino-acid repeat (HIN-200) family. Six different alternatively spliced forms of mRNA are transcribed from the IFIX gene, which are predicted to encode six different isoforms of IFIX proteins (IFIXalpha1, alpha2, beta1, beta2, gamma1, and gamma2). The IFIX proteins are primarily localized in the nucleus. They share a common N-terminal region that contains a predicted pyrin domain and a putative nuclear localization signal. Unlike IFIXalpha and IFIXbeta, IFIXgamma isoforms do not have the 200-amino-acid signature motif. Interestingly, the expression of IFIX was reduced in most human breast tumors and breast cancer cell lines. Expression of IFIXalpha1, the longest isoform of IFIX, in human breast cancer cell lines reduced their anchorage-dependent and -independent growth in vitro and tumorigenicity in nude mice. Moreover, a liposome-mediated IFIXalpha1 gene transfer suppressed the growth of already-formed tumors in a breast cancer xenograft model. IFIXalpha1 appears to suppress the growth of breast cancer cells in a pRB- and p53-independent manner by increasing the expression of the cyclin-dependent kinase inhibitor p21(CIP1), which leads to the reduction of the kinase activity of both Cdk2 and p34(Cdc2). Together, our results show that IFIXalpha1 possesses a tumor-suppressor activity and suggest IFIXalpha1 may be used as a therapeutic agent in cancer treatment.
journal_name
Oncogenejournal_title
Oncogeneauthors
Ding Y,Wang L,Su LK,Frey JA,Shao R,Hunt KK,Yan DHdoi
10.1038/sj.onc.1207592subject
Has Abstractpub_date
2004-06-03 00:00:00pages
4556-66issue
26eissn
0950-9232issn
1476-5594pii
1207592journal_volume
23pub_type
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