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[Relationship between mitochondrial DNA instability and interleukin-8 activity in gastric mucosa]
Xian-long Ling1, Dian-chun Fang, Rong-quan Wang
1Department of Gastroenterology, Southwest Hospital, the Third Military Medical University, Chongqing 400038, China.
Objective:
To evaluate the relationship between mitochondrial DNA instability (mtMSI) and interleukin-8 (IL-8) activity in gastric mucosa of various lesions.
Methods:
IL-8 level in gastric mucosa was assayed using ELISA method. The mtMSI was detected by PCR-SSCP techniques.
Results:
mtMSI was observed in 11 out of 30 (36.7%) gastric cancers, 2 of 15 (13.3%) intestinal metaplasia, 2 of 10 dysplasia and 1 of 10 chronic atrophic gastritis. IL-8 level in mtMSI+ group [(76.8 +/- 3.8) pg/mg] was significantly higher than that in mtMSI- group [(48.3 +/- 3.6) pg/mg, P < 0.05].
Conclusion:
mtMSI closely correlates with IL-8 level in gastric mucosa and is involved in gastric carcinogenesis.
Insights
Mitochondrial DNA instability (mtMSI) is linked to higher interleukin-8 (IL-8) levels in gastric mucosa. This association suggests mtMSI plays a role in the development of gastric cancer.
Area of Science:
- Gastroenterology
- Molecular Biology
- Oncology
Context:
- Gastric mucosa harbors various lesions, including chronic atrophic gastritis, intestinal metaplasia, and dysplasia, which can progress to gastric cancer.
- Mitochondrial dysfunction and genetic instability are increasingly implicated in carcinogenesis.
- Interleukin-8 (IL-8) is a pro-inflammatory cytokine known to play a role in various cancers, including gastric cancer.
Purpose:
- To investigate the correlation between mitochondrial DNA instability (mtMSI) and interleukin-8 (IL-8) activity in gastric mucosa across different types of lesions.
- To determine if mtMSI is present in precancerous gastric lesions and gastric cancer.
- To assess the relationship between IL-8 levels and the presence or absence of mtMSI.
Summary:
- Mitochondrial DNA instability (mtMSI) was detected in 36.7% of gastric cancers, 13.3% of intestinal metaplasia, and 10% of dysplasia and chronic atrophic gastritis.
- IL-8 levels were significantly higher in gastric mucosa samples with mtMSI compared to those without mtMSI (76.8 pg/mg vs. 48.3 pg/mg, P < 0.05).
- The study utilized ELISA for IL-8 assays and PCR-SSCP for mtMSI detection.
Impact:
- The findings indicate a strong correlation between mtMSI and elevated IL-8 levels in the gastric mucosa.
- This suggests that mtMSI is involved in the pathogenesis of gastric carcinogenesis.
- Understanding this relationship may offer new insights into diagnostic markers and therapeutic targets for gastric cancer.