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Autophagy is a catabolic process, which is involved in the maintenance of intracellular homeostasis by degrading redundant molecules and organelles. Autophagy begins with the formation of a double-membrane phagophore, followed by its enclosure, thus leading to the appearance of an autophagosome which fuses with lysosome. This process is highly conserved, precisely orchestrated and regulated by autophagy-related genes. Recently, autophagy has been widely studied in different types of cancers, including colorectal cancer. As it has been revealed, autophagy plays two opposite roles in tumorigenesis, as a tumor suppressor and a tumor enhancer/activator, and therefore is called a double-edge sword. Recently, interaction between autophagy and apoptosis has been found. Therefore, we aimed to study the mRNA levels of genes engaged in autophagy and apoptosis in colorectal cancer tissues. Colorectal cancer and adjacent healthy tissues were obtained from 73 patients diagnosed with primary colorectal cancer. Real-time PCR analysis employing Universal Probe Library was used to assess the expression of the seven following selected genes:  BECN1 ,  UVRAG ,  ULK1 ,  ATG13 ,  Bif - 1 ,  BCL2  and  BAX . For all but one of the tested genes, a decrease in expression was observed. An increase in expression was observed for  BAX. BAX  expression decreases consistently from early to more advanced stages. High expression of  BAX  was strongly associated with negative  UVRAG  expression. The high expression of the  BAX  gene seems to be a negative regulator of autophagy in colorectal cancer cells. The relative downregulation of autophagy-related genes was observed in colorectal cancer samples.

The BAX gene as a candidate for negative autophagy-related genes regulator on mRNA levels in colorectal cancer