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Analysis of signaling protein kinases in human colon or colorectal carcinomas
1Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, 27599, USA.
Abstract:
Extracellular signal-related kinase (ERK) and c-Jun N-terminal kinase (JNK) mitogen-activated protein (MAP) kinases are highly activated in an in vivo rat model of colorectal carcinogenesis. In addition, other protein kinases such as c-Src and c-Yes have been shown to be up-regulated in some human colon cancers. To evaluate the activity of these kinases in human colorectal carcinomas, we examined colon cancers and adjacent normal intestinal mucosa from 11 patients. Moderate increases in ERK and JNK activities, in addition to up-regulation of c-Src, p125FAK, and tyrosine-phosphorylated proteins, were observed in a subset of the colorectal carcinomas. There was a significant correlation found between levels of c-Src, p125FAK, and tyrosine-phosphorylated proteins, as well as between c-Src protein levels and JNK activity. This is the first report that examines several different kinases as markers to characterize colorectal cancers in the same carcinoma sample, allowing the determination of correlations between markers in the same tumors.
Insights
This study investigated protein kinase activity in colorectal cancer, finding increased Extracellular signal-related kinase (ERK) and c-Jun N-terminal kinase (JNK) activity, alongside elevated c-Src and p125FAK levels in tumors. These findings highlight potential kinase biomarkers for colorectal cancer characterization.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Colorectal cancer (CRC) is a significant global health concern.
- Aberrant protein kinase activity is implicated in carcinogenesis.
- Specific kinases like ERK and JNK are activated in preclinical CRC models.
Purpose of the Study:
- To evaluate the activity and expression of key protein kinases in human colorectal carcinomas.
- To identify potential kinase biomarkers for CRC characterization.
- To explore correlations between different kinase markers within the same tumor samples.
Main Methods:
- Analysis of colon cancer tissues and adjacent normal mucosa from 11 patients.
- Assessment of Extracellular signal-related kinase (ERK) and c-Jun N-terminal kinase (JNK) activities.
- Evaluation of c-Src, p125FAK, and tyrosine-phosphorylated protein levels.
Main Results:
- Moderate increases in ERK and JNK activities were observed in a subset of colorectal carcinomas.
- Up-regulation of c-Src, p125FAK, and tyrosine-phosphorylated proteins was noted.
- Significant correlations were found between c-Src, p125FAK, and tyrosine-phosphorylated proteins, and between c-Src and JNK activity.
Conclusions:
- This study provides the first comprehensive analysis of multiple kinase markers in individual colorectal cancer samples.
- Elevated levels of specific kinases (ERK, JNK, c-Src, p125FAK) are present in human colorectal carcinomas.
- Kinase profiles may serve as valuable biomarkers for characterizing colorectal cancer and understanding its molecular pathogenesis.