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Shetty, S. et al.

Sreerama Shetty, Praveenkumar Shetty, Steven Idell, Thirunavukkarasu Velusamy, Yashodhar P. Bhandary, Rashmi S. Shetty,

Regulation of plasminogen activator inhibitor-1 expression by tumor suppressor protein p53.

H1299 lung carcinoma cells lacking p53 (p53-/-) express minimal amounts of plasminogen activator inhibitor-1 (PAI-1) protein as well as mRNA. p53(-/-) cells express highly unstable PAI-1 mRNA. Transfection of p53 in p53(-/-) cells enhanced PAI-1 expression and stabilized PAI-1 mRNA. On the contrary, inhibition of p53 expression by RNA silencing in non-malignant human lung epithelial (Beas2B) cells decreased basal as well as urokinase-type plasminogen activator-induced PAI-1 expression because of accelerated degradation of PAI-1 mRNA. Purified p53 protein specifically binds to the PAI-1 mRNA 3'-un-translated region (UTR), and endogenous PAI-1 mRNA forms an immune complex with p53. Treatment of purified p53 protein with anti-p53 antibody abolished p53 binding to the 3'-UTR of PAI-1 mRNA. The p53 binding region maps to a 70-nucleotide PAI-1 mRNA 3'-UTR sequence, and insertion of the p53-binding sequence into beta-globin mRNA destabilized the chimeric transcript. Deletion experiments indicate that the carboxyl-terminal region (amino acid residues 296-393) of p53 protein interacts with PAI-1 mRNA. These observations demonstrate a novel role for p53 as an mRNA-binding protein that regulates increased PAI-1 expression and stabilization of PAI-1 mRNA in human lung epithelial and carcinoma cells.[1]

References

Regulation of plasminogen activator inhibitor-1 expression by tumor suppressor protein p53. Shetty, S., Shetty, P., Idell, S., Velusamy, T., Bhandary, Y.P., Shetty, R.S. J. Biol. Chem. (2008) [Pubmed]

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