Downregulation of the p53 tumor suppressor gene and upregulation of the bcl-2 gene in retinoic acid receptor alpha-deficient transgenic mice.

Abstract:

:We recently demonstrated lymphoma development in transgenic mice deficient in retinoic acid receptor alpha (RARalpha). High incidence of lymphoma development in this transgenic mouse model system was similar to lymphoma development in p53 knockout mice. In an effort to understand the molecular basis of lymphomagenesis in RARalpha-deficient transgenic mice, we compared the levels of RARalpha to the levels of p53 mRNA, and Bcl-2, and Bax proteins in lymphoid and non-lymphoid tissues and in lymphomas derived from the RARalpha-deficient transgenic mice. The p53 mRNA levels were depleted in various tissues including spleen ( approximately 96%), thymus ( approximately 29%) and bone marrow ( approximately 62%) of RARalpha-deficient transgenic mice when compared with the normal littermates, and the reduction in p53 mRNA expression in the various tissues examined was proportional to the reduction in RARalpha expression. Bcl-2 to Bax ratios were highly increased in the lymphoid compartments (spleen >bone marrow >thymus) because of selective overexpression of Bcl-2 protein. In summary, RARalpha downmodulation in this transgenic mouse model system was accompanied by p53 downmodulation and deregulation of Bcl-2 to Bax ratios in the lymphoid compartments.

journal_name

Int J Oncol

authors

Haidar MA,Manshouri T,Keating MJ,Kantarjian HM,Freireich EJ,Mehta K,Albitar M

doi

10.3892/ijo.16.3.561

keywords:

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

561-5

issue

3

eissn

1019-6439

issn

1791-2423

journal_volume

16

pub_type

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