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Expression of epidermal growth factor, transforming growth factor-alpha and their receptor genes in human gastric
1First Department of Pathology, Hiroshima University School of Medicine.
Abstract:
The expressions of mRNA for epidermal growth factor (EGF), transforming growth factor-alpha (TGF-alpha) and EGF receptor (EGFR) genes were examined in 7 human gastric carcinoma cell lines and 15 gastric carcinoma tissues and the corresponding normal mucosas. All of the gastric carcinoma cell lines expressed mRNA for EGFR and TGF-alpha genes. TMK-1 and MKN-28 cells also expressed EGF mRNA. Production of EGF, TGF-alpha and EGFR protein by gastric carcinoma cell lines was also confirmed by EGF and TGF-alpha specific monoclonal antibody binding. As for surgical specimens, EGFR and TGF-alpha mRNA were detected at high levels in all the tumor tissues. Interestingly, EGF mRNA was detected in 5 (33.3%) of the 15 gastric carcinomas but it was not detected in normal tissues. Moreover, anti-EGF and anti-TGF-alpha monoclonal antibodies inhibited the spontaneous 3H-TdR uptake by gastric carcinoma cells. These results suggest that EGF and/or TGF-alpha produced by tumor cells act as autocrine growth factors for gastric carcinomas.
Insights
Tumor cells in gastric cancer produce epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha), acting as autocrine growth factors. These factors, along with their receptor (EGFR), are key in gastric carcinoma development and progression.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Gastric carcinoma is a significant global health concern.
- The role of growth factors in cancer development is an active area of research.
- Epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) are implicated in cell proliferation.
Purpose of the Study:
- To investigate the expression of EGF, TGF-alpha, and their receptor (EGFR) in gastric carcinoma.
- To determine if these factors function as autocrine growth factors in gastric cancer.
Main Methods:
- Analysis of mRNA expression for EGF, TGF-alpha, and EGFR in gastric carcinoma cell lines and tissues using RT-PCR.
- Detection of protein production using specific monoclonal antibodies.
- Assessment of growth inhibition by antibodies against EGF and TGF-alpha.
Main Results:
- All tested gastric carcinoma cell lines expressed EGFR and TGF-alpha mRNA and protein.
- EGF mRNA and protein were also detected in some cell lines and tumor tissues.
- EGF mRNA was notably absent in normal gastric tissues.
- Monoclonal antibodies against EGF and TGF-alpha inhibited tumor cell proliferation.
Conclusions:
- EGF and/or TGF-alpha produced by gastric tumor cells likely act as autocrine growth factors.
- EGFR and TGF-alpha are consistently expressed in gastric carcinomas.
- EGF may play a specific role in a subset of gastric carcinomas.