Tumor suppressor MDA-7/IL-24 selectively inhibits vascular smooth muscle cell growth and migration

被引:25
作者
Chen, JY
Chada, S
Mhashilkar, A
Miano, JM
机构
[1] Univ Rochester, Med Ctr, Cardiovasc Res Ctr, Rochester, NY 14642 USA
[2] Introgen Therapeut Inc, Houston, TX 77030 USA
关键词
MDA-7; interleukin-24; proliferation; apoptosis; migration; heterogeneity; smooth muscle cell; adenoviral vector;
D O I
10.1016/S1525-0016(03)00176-X
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Abnormalities in smooth muscle cell (SMC) proliferation and differentiation underlie the pathogenesis of proliferative vascular diseases. MDA-7 (HUGO approved symbol IL24) is a unique gene, originally identified as a tumor suppressor and more recently shown to have cytokine activity. MDA-7/IL24 has been implicated in apoptosis and cellular differentiation in tumor cells and in tumor invasion/metastasis in clinical specimens-properties central to SMC remodeling during proliferative vascular diseases. In this study, we evaluated the effects of overexpressing MDA-7/IL24 in various SMC: the apparently "normal" rat PAC1 cell line, primary human coronary artery SMC, and normal rat aortic SMC. We transduced SMC with adenovirus-mda7 (Ad-mda7) or control virus (Ad-Luc) and assessed cell viability, apoptosis, and migration. Ad-mda7 suppressed PAC1 cell growth in a dose-dependent manner while having no effect on normal primary human coronary artery cells or rat aortic SMC, despite strong expression of the MDA-7 transgene in all SMC. Similarly, Ad-mda7 treatment induced apoptosis in PAC1 cells with essentially no effect on normal coronary and rat aortic SMC. Ad-mda7 also inhibited serum-stimulated PAC1 cell migration. Karyotype analysis of PAC1 cells revealed that they exhibit multiple chromosomal aberrations. Importantly, recombinant MDA-7 did not elicit cell death or STAT-3 activation in PAC1 SMC, suggesting that the effects of Ad-mda7 were mediated through an intracellular pathway. These data demonstrate that Ad-mda7 exhibits selectivity in apoptosis induction and growth suppression in an atypical SMC line, raising new questions pertaining to heterogeneity in SMC death susceptibility.
引用
收藏
页码:220 / 229
页数:10
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