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Roxithromycin suppresses mucin gene expression in epithelial cells
Dong-Young Kim1, Kazuhiko Takeuchi, Hajime Ishinaga
1Department of Otorhinolaryngology, Mie University School of Medicine, Edobashi, Tsu, Japan.
Pharmacology
|August 5, 2004
Summary
Roxithromycin, a macrolide antibiotic, was found to suppress MUC2 gene expression in intestinal cells. This effect is likely mediated by inhibiting NF-kappaB activation, offering insight into macrolide mechanisms.
Area of Science:
- Molecular Biology
- Cell Biology
- Pharmacology
Background:
- Macrolide antibiotics are known to inhibit mucus secretion.
- The precise mechanism underlying this inhibition remains unclear.
- Mucin 2 (MUC2) is the primary gel-forming mucin in the intestinal tract.
Purpose of the Study:
- To investigate the effect of roxithromycin on MUC2 gene expression.
- To elucidate the molecular mechanism by which roxithromycin influences MUC2 expression.
- To examine the role of NF-kappaB signaling in roxithromycin's effect on MUC2.
Main Methods:
- Utilized a reporter gene assay in cultured intestinal epithelial HM3-MUC2 cells.
- Assessed MUC2 gene transcriptional activity in response to roxithromycin.
- Investigated the impact of various inflammatory stimuli (PMA, LTA, LPS, LTD4) on MUC2 expression.
- Analyzed the effect of roxithromycin on NF-kappaB and AP-1 activation.
Main Results:
- Roxithromycin dose-dependently suppressed MUC2 gene transcriptional activity.
- PMA, LTA, LTD4, and LPS significantly increased MUC2 luciferase activity.
- Roxithromycin inhibited PMA-induced MUC2 gene expression in a dose-dependent manner.
- Roxithromycin significantly suppressed NF-kappaB activation but not AP-1 activation.
Conclusions:
- Roxithromycin suppresses MUC2 gene expression in intestinal epithelial cells.
- The suppression of MUC2 expression by roxithromycin is likely mediated through the inhibition of NF-kappaB activation.
- These findings provide mechanistic insights into how macrolides affect mucus production.