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Variations in NAG-1 expression of human gastric carcinoma and normal gastric tissues
Gongli Yang1, Qinhua Tan2, Yongmei Xie2
1Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China ; Department of Gastroenterology, Taihe Hospital, Hubei Medical University, Shiyan, Hubei 442000, P.R. China.
Abstract:
Nonsteroidal anti-inflammatory drug-activated gene-1 (NAG-1), a member of the transforming growth factor β (TGF-β) superfamily, has been demonstrated to possess antitumorigenic and proapoptotic activities in gastric cancer cells. In the present study, the expression of NAG-1 was assessed in human gastric carcinoma, tumor-adjacent normal tissues and normal gastric mucosa, with the aim to investigate the role of NAG-1 in the carcinogenesis and development of gastric carcinoma. NAG-1 protein expression was evaluated using immunohistochemical staining, while the expression of NAG-1 mRNA was evaluated using reverse transcription-polymerase chain reaction. It was observed that adenocarcinoma tissues had a lower expression of NAG-1 than normal gastric tissues. Furthermore, moderately and well-differentiated adenocarcinoma tissues expressed more NAG-1 protein than the poorly differentiated adenocarcinoma tissues. The expression of NAG-1 protein in adenocarcinoma tissues did not correlate with tumor-node-metastasis staging, infiltration degree or tumor size. The NAG-1 mRNA expression in adenocarcinoma tissues was also lower than that in normal gastric tissues. In conclusion, NAG-1 was poorly expressed in adenocarcinoma tissues and inversely correlated with the degree of tumor differentiation. These results indicate that NAG-1 may have an anti-oncogenic function in the carcinogenesis and development of gastric carcinoma, and that its attenuated or absent expression may lead to gastric carcinogenesis.
Insights
Nonsteroidal anti-inflammatory drug-activated gene-1 (NAG-1) shows reduced expression in gastric cancer, particularly in poorly differentiated tumors. This suggests NAG-1 may act as a tumor suppressor in gastric carcinogenesis.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Nonsteroidal anti-inflammatory drug-activated gene-1 (NAG-1) is a TGF-β superfamily member with known antitumorigenic and proapoptotic effects.
- Its role in gastric cancer development requires further elucidation.
Purpose of the Study:
- To investigate the expression and role of NAG-1 in human gastric carcinoma.
- To correlate NAG-1 expression with clinicopathological features of gastric cancer.
Main Methods:
- Immunohistochemical staining was used to assess NAG-1 protein expression.
- Reverse transcription-polymerase chain reaction (RT-PCR) was employed to evaluate NAG-1 mRNA levels.
- Expression was compared between gastric carcinoma tissues, tumor-adjacent normal tissues, and normal gastric mucosa.
Main Results:
- NAG-1 expression (both protein and mRNA) was significantly lower in adenocarcinoma tissues compared to normal gastric tissues.
- Higher NAG-1 protein expression was observed in moderately and well-differentiated tumors than in poorly differentiated ones.
- NAG-1 expression did not correlate with tumor-node-metastasis staging, infiltration depth, or tumor size.
Conclusions:
- NAG-1 exhibits reduced expression in gastric adenocarcinoma, inversely correlating with tumor differentiation.
- These findings suggest an anti-oncogenic function for NAG-1 in gastric carcinogenesis.
- Attenuated or absent NAG-1 expression may contribute to the development of gastric cancer.
