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Published on: February 27, 2014
Anti-inflammatory and glial response maintain normal colon function in trimethyltin-treated rats
Dian Eurike Septyaningtrias1, Nur Salisa Siddik Muliyantoro1, Yustina Andwi Ari Sumiwi1
1Department of Histology and Cell Biology, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Jalan Farmako Sekip Utara, Yogyakarta, 55281, Indonesia.
Trimethyltin exposure in rats causes colon inflammation and myenteric plexus damage, disrupting intestinal homeostasis. However, normal colon function is maintained due to balanced inflammatory responses in this animal model for neurodegenerative disease research.
Area of Science:
- Neuroscience
- Gastroenterology
- Toxicology
Background:
- Enteric neuropathy and intestinal homeostasis are implicated in central nervous system (CNS) degeneration, but animal models yield varied results.
- Colonic myenteric plexus degeneration was recently observed in trimethyltin-treated rats, suggesting a potential model for studying ENS-CNS interactions.
Purpose of the Study:
- To characterize the effects of trimethyltin (TMT) on colonic function, structure, and homeostasis in a rat model.
- To evaluate the potential of TMT-treated rats for investigating the relationship between the enteric nervous system (ENS) and CNS degeneration.
Main Methods:
- Rats were treated with trimethyltin (8 mg/kg, i.p.) and assessed for colonic function (fecal output, transit time).
- Histological examination (H&E, immunohistochemistry) evaluated mucosal inflammation, epithelial homeostasis, and myenteric plexus changes (iNOS, arginase-1, GFAP, cell death).
- Quantitative PCR measured mRNA expression of tight junction proteins (e.g., claudin 1) to assess colon permeability.
Main Results:
- TMT induced colonic mucosal inflammation (immune cell infiltration, crypt damage) and increased iNOS/arginase-1 expression.
- TMT caused cell death and increased iNOS, arginase-1, and GFAP expression in the colonic myenteric plexus.
- Intestinal epithelial cell homeostasis was altered (reduced proliferation, goblet cell distribution), and claudin 1 expression was upregulated.
- Despite these changes, normal colon function (fecal pellet output, transit time) was preserved.
Conclusions:
- Trimethyltin induces significant colon inflammation, myenteric plexus damage, and disrupts intestinal epithelial homeostasis in rats.
- The preservation of normal colon function suggests a compensatory mechanism involving balanced inflammatory responses.
- This TMT-induced rat model shows potential for studying ENS-CNS degeneration links, despite intact colonic function.
