Journal Article

Transketolase-Like 1 Expression Is Modulated during Colorectal Cancer Progression and Metastasis Formation

Tarrado-Castellarnau, Miriam, Alenda, Cristina, Castells, Antoni, Diaz-Moralli, Santiago, Cascante, Marta

2011

Overview

Transketolase-like 1 (TKTL1) induces glucose degradation through anaerobic pathways, even in presence of oxygen, favoring the malignant aerobic glycolytic phenotype characteristic of tumor cells. As TKTL1 appears to be a valid biomarker for cancer prognosis, the aim of the current study was to correlate its expression with tumor stage, probability of tumor recurrence and survival, in a series of colorectal cancer patients. METHODOLODY/PRINCIPAL FINDINGS: Tumor tissues from 63 patients diagnosed with colorectal cancer at different stages of progression were analyzed for TKTL1 by immunohistochemistry. Staining was quantified by computational image analysis, and correlations between enzyme expression, local growth, lymph-node involvement and metastasis were assessed. The highest values for TKTL1 expression were detected in the group of stage III tumors, which showed significant differences from the other groups (Kruskal-Wallis test, P = 0.000008). Deeper analyses of T, N and M classifications revealed a weak correlation between local tumor growth and enzyme expression (Mann-Whitney test, P = 0.029), a significant association of the enzyme expression with lymph-node involvement (Mann-Whitney test, P = 0.0014) and a significant decrease in TKTL1 expression associated with metastasis (Mann-Whitney test, P = 0.0004). To our knowledge, few studies have explored the association between variations in TKTL1 expression in the primary tumor and metastasis formation. Here we report downregulation of enzyme expression when metastasis appears, and a correlation between enzyme expression and regional lymph-node involvement in colon cancer. This finding may improve our understanding of metastasis and lead to new and more efficient therapies against cancer.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Acidification / Aged / Biology / Biomarkers / Cancer / Colon / Colon cancer / Colorectal cancer / Colorectal carcinoma / Colorectal Neoplasms - genetics / Colorectal Neoplasms - metabolism / Colorectal Neoplasms - pathology / Computer applications / Correlation / Correlation analysis / Development and progression / Disease Progression / Enzymes / Epigenetics / Fatty acids / Female / Fibroblasts / Gene Expression Regulation, Neoplastic / Genes / Glucose / Glycolysis / Health aspects / Histology / Humans / Hypoxia / Image analysis / Image processing / Immunohistochemistry / Kinases / Laboratories / Localization / Lymph / Lymph nodes / Lymphatic Metastasis / Male / Medicine / Metabolism / Metastases / Metastasis / Molecular Imaging / Neoplasm Staging / Oxygen / Patients / Reproducibility of Results / Rodents / Survival Analysis / Tissues / Transketolase / Transketolase - metabolism / Tumor cells / Tumors