Background: Although there have been many studies on the p73 gene, some of its functions still remain unclear.
There is little research on the relationship between p73 gene transcription and its protein expression and the
response to certain drugs such as oxaliplatin and cetuximab, which are drugs currently used in colorectal cancer.
The purpose of this study was to evaluate the impact of TAp73 expression on oxaliplatin and cetuximab-based
chemotherapy in colorectal cancer cell lines with different K-Ras and B-Raf mutational status.
Methods: TAp73 was analyzed in three colorectal tumor cell lines HT-29, SW-480 and Caco-2. mRNA TAp73 was
determined using Real time PCR; TAp73 protein by immunoblotting and cell viability was analyzed by the MTT
method.
Results: We found that mRNA and TAp73 protein were decreased in cells treated with oxaliplatin (in monotherapy
or combined with cetuximab) when B-Raf is mutated. This was statistically significant and was also associated with
higher cell viability after the treatment.
Conclusions: Here, for the first time we report, that there is a signaling loop between B-Raf activation and p73
function.
Low expression of TAp73 in colorectal cancer cell lines with mutated B-Raf may be involved in the lack of response
to oxaliplatin in monotherapy or combined with cetuximab.
