alexa The RASSF1 Gene and the Opposing Effects of the RASSF1A and RASSF1C Isoforms on Cell Proliferation and Apoptosis.
Biochemistry

Biochemistry

Clinical & Medical Biochemistry

Author(s): Reeves ME, Firek M, Chen ST, Amaar Y

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Abstract RASSF1A has been demonstrated to be a tumor suppressor, while RASSF1C is now emerging as a growth promoting protein in breast and lung cancer cells. To further highlight the dual functionality of the RASSF1 gene, we have compared the effects of RASSF1A and RASSF1C on cell proliferation and apoptosis in the presence of TNF- α . Overexpression of RASSF1C in breast and lung cancer cells reduced the effects of TNF- α on cell proliferation, apoptosis, and MST1/2 phosphorylation, while overexpression of RASSF1A had the opposite effect. We also assessed the expression of RASSF1A and RASSF1C in breast and lung tumor and matched normal tissues. We found that RASSF1A mRNA levels are significantly higher than RASSF1C mRNA levels in all normal breast and lung tissues examined. In addition, RASSF1A expression is significantly downregulated in 92\% of breast tumors and in 53\% of lung tumors. Conversely, RASSF1C was upregulated in 62\% of breast tumors and in 47\% of lung tumors. Together, these findings suggest that RASSF1C, unlike RASSF1A, is not a tumor suppressor but instead may play a role in stimulating survival in breast and lung cancer cells.
This article was published in Mol Biol Int and referenced in Clinical & Medical Biochemistry

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