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Int J Med Sci 2015; 12(6):458-467. doi:10.7150/ijms.11808

Research Paper

Altered Activity and Expression of Cytosolic Peptidases in Colorectal Cancer

Itxaro Perez1,2,6, Lorena Blanco2,6, Begoña Sanz2,6, Peio Errarte2,6, Usue Ariz2,6, Maider Beitia2,6, Ainhoa Fernández2,6, Alberto Loizate3, M Luz Candenas4, Francisco M Pinto4, Javier Gil2,6, José I. López5,6, Gorka Larrinaga1,2,6,✉

1. Department of Nursing I, School of Nursing, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
2. Department of Physiology, Faculty of Medicine and Dentistry, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
3. Department of Surgery, Basurto University Hospital, University of the Basque Country (UPV/EHU), Bilbao, Bizkaia, Spain
4. Institute for Chemical Research, CSIC-Isla de la Cartuja, Sevilla, Spain;
5. Department of Anatomic Pathology, Cruces University Hospital, University of the Basque Country (UPV/EHU), Barakaldo, Bizkaia, Spain
6. BioCruces Health Research Institute, Barakaldo, Bizkaia, Spain


Background and Objective: The role of peptidases in carcinogenic processes and their potential usefulness as tumor markers in colorectal cancer (CRC) have been classically attributed to cell-surface enzymes. The objective of the present study was to analyze the activity and mRNA expression of three cytosolic peptidases in the CRC and to correlate the obtained results with classic histopathological parameters for tumor prognosis and survival.

Methods: The activity and mRNA levels of puromycin-sensitive aminopeptidase (PSA), aminopeptidase B (APB) and pyroglutamyl-peptidase I (PGI) were measured by fluorimetric and quantitative RT-PCR methods in colorectal mucosa and tumor tissues and plasma samples from CRC patients (n=81).

Results: 1) PSA and APB activity was higher in adenomas and carcinomas than in the uninvolved mucosa. 2) mRNA levels of PSA and PGI was lower in tumors. 3) PGI activity in CRC tissue correlated negatively with histological grade, tumor size and 5-year overall suvival of CRC patients. 4) Higher plasmatic APB activity was independently associated with better 5-year overall survival.

Conclusions: Data suggest that cytosolic peptidases may be involved in colorectal carcinogenesis and point to the determination of this enzymes as a valuable method in the determination of CRC prognosis.

Keywords: colorectal cancer, prognosis, survival, cytosolic, soluble, peptidases.

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) License. See for full terms and conditions.
How to cite this article:
Perez I, Blanco L, Sanz B, Errarte P, Ariz U, Beitia M, Fernández A, Loizate A, Candenas ML, Pinto FM, Gil J, López JI, Larrinaga G. Altered Activity and Expression of Cytosolic Peptidases in Colorectal Cancer. Int J Med Sci 2015; 12(6):458-467. doi:10.7150/ijms.11808. Available from