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Changes in vasoactive substances during gastric ulcer healing
H Hashimoto1, M Akimoto, A Maeda
1Institute of Geriatrics, Tokyo Women's Medical College, Japan. TWMU-ig@mxg.mesh.ne.jp
Journal of Cardiovascular Pharmacology
|November 15, 2000
Summary
Vasoactive peptides like endothelin-1 (ET-1) and adrenomedullin (AM) play key roles in gastric ulcer healing. Their concentrations and locations change significantly across active, healing, and scarring stages of ulcers, influencing tissue repair.
Area of Science:
- Gastroenterology
- Vascular Biology
- Wound Healing Research
Background:
- Gastric ulcers are a significant health concern, often associated with Helicobacter pylori (Hp) infection.
- Vasoactive peptides are crucial in regulating vascular tone and tissue repair processes.
Purpose of the Study:
- To investigate the roles of endothelin-1 (ET-1), adrenomedullin (AM), and transforming growth factor-beta (TGF-beta) in gastric ulcer healing.
- To compare peptide concentrations across different stages of gastric ulcer development.
Main Methods:
- Quantification of ET-1, AM, and TGF-beta concentrations in gastric ulcer tissues from 82 patients.
- Immunostaining to determine the cellular localization of ET-1 and AM.
- Comparison with control groups of Hp-positive and Hp-negative gastritis.
Main Results:
- ET-1 and TGF-beta concentrations were highest in the healing stage (GH), followed by active (GA) and scarring (GS) stages.
- AM concentrations showed an inverse trend, highest in the scarring stage (GS).
- ET-1 localized to endothelial cells and smooth muscle cells during healing and scarring; AM localized to histiocytes, glandular epithelia, and smooth muscle fibers.
Conclusions:
- ET-1 and AM are implicated in regulating vascular tonus and smooth muscle cell proliferation during gastric ulcer repair.
- Peptide expression patterns suggest distinct roles in different phases of ulcer healing.