Mauriz JL, Gonzalez P, Duran MC, Molpeceres V, Culebras JM, Gonzalez-Gallego J. Cell-cycle inhibition by TNP-470 in an in vivo model of hepatocarcinoma is mediated by a p53 and p21WAF1/CIP1 mechanism.
Transl Res 2007;
149:46-53. [PMID:
17196522 DOI:
10.1016/j.trsl.2006.07.004]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Revised: 06/06/2006] [Accepted: 07/11/2006] [Indexed: 12/12/2022]
Abstract
The objective of this study was to determine in a rat model of hepatocellular carcinoma (HCC) the effects of the antiangiogenic agent TNP-470 on cell proliferation and effectors of the apoptotic pathway, including p53, p21WAF1/CIP1, cyclin D, and cyclin E. Tumor was induced in male Wistar rats by diethylnitrosamine and promoted by two-thirds hepatectomy plus acetaminofluorene administration. Experiments were carried out at 28 weeks after initiating the treatment. TNP-470 was administered at 30 mg/kg, 3 times per week from 20 to 28 weeks. Serum levels of vascular endothelial growth factor (VEGF) and hepatocyte growth factor beta (HGFbeta) liver expression were increased by hepatocarcinogenesis (+38% and +183%, respectively), and treatment with TNP-470 was able to prevent the increase in these angiogenic factors induced by HCC. HCC coursed with reduced expression of p21WAF1/CIP1 and p53 (-63% and -60%, respectively). Hepatic expression of cyclin D and cyclin E were significantly increased in rats with HCC (+108% and +115%, respectively). In animals with experimental carcinogenesis, a significant increase in the expression of Cdk4 and CdK2 was also observed (+119% and +187%, respectively). These effects were prevented by TNP-470 administration. In conclusion, cell-cycle inhibition by TNP-470 is mediated at least in part by an activation of p21WAF1/CIP1 because of a p53-dependent mechanism, with reduction of the cyclin D-Cdk4 and cyclin E-Cdk 2 expression. These cytostatic effects should be considered when assessing the efficacy of TNP-470 for anti-angiogenic therapy. These findings may prove useful for the development of therapies for the treatment of human HCC.
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