Background: The risk of sporadic colorectal cancer (CRC) is strongly influenced by Iifestyle, environmental and genetic factors. Protein tyrosine phosphatases belong to a group of enzymes whose role in CRC has not yet been intensively studied. They play an important role in activation/de-activation of many enzymes, influencing cell biology by catalyzing reactions opposing those catalyzed by kinases. Protein tyrosine phosphatase receptor-like type Q (PTPRQ) and protein tyrosine phosphatase receptor-like type Z polypeptide 1 (PTPRZ1) have both been shown to be important in development of many cancer types including CRC.
Materials and methods: The expression level of PTPRQ and PTPRZ1 was determined by real-time polymerase chain reaction in 16 CRC tissues obtained from patients diagnosed with adenocarcinoma coli.
Results: We revealed a high level of PTPRQ expression (p=0.0080), as well as an association between expression levels of PTPRQ and PTPRZ1 (p<0.0001). Moreover PTPRQ expression was higher in tissues presenting with Kirsten rat sarcoma viral oncogene homolog (KRAS) mutation (p=0.0293).
Conclusion: We confirmed the contribution of PTPRZ1 and especially PTPRQ in CRC development, supporting the hypothesis that PTPRQ is a candidate oncogene, playing a crucial role in phosphorylation/dephosphorylation signaling pathways.
Keywords: PTPRQ; PTPRZ1; Protein tyrosine phosphatase; colorectal cancer.
Copyright© 2016 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.