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Bacillus clausii effect on gene expression pattern in small bowel mucosa using DNA microarray analysis.

Simona Di Caro¹, Hong Tao, Antonino Grillo

¹Department of Gastroenterology, Catholic University, Rome, Italy.

European Journal of Gastroenterology & Hepatology

|August 12, 2005

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Bacillus clausii (B. clausii) alters gene expression in the intestinal mucosa, impacting immune response and cell processes. This study provides insights into how probiotics interact with the host for potential health benefits.

Area of Science:

Gastroenterology
Microbiology
Molecular Biology

Background:

Probiotics are utilized for managing various health conditions.
Understanding the intricate bacteria-host interactions in the gut is crucial for informed clinical decisions.

Purpose of the Study:

To investigate the gene expression patterns induced by Bacillus clausii in the intestinal mucosa of healthy individuals.

Main Methods:

Gene expression profiling was conducted on duodenal biopsies from patients using the GeneChip Human U133A array.
Microarray results were validated using real-time reverse transcriptase-polymerase chain reaction (PCR).

Main Results:

Bacillus clausii administration led to significant alterations in gene expression, with 158 genes upregulated and 265 downregulated.

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The primary affected pathways included immune response, inflammation, apoptosis, cell growth, differentiation, cell-cell signaling, and signal transduction.

Conclusions:

This research offers the first comprehensive analysis of Bacillus clausii's impact on intestinal gene expression in healthy individuals.
The findings lay the groundwork for elucidating the mechanisms behind probiotic-host interactions and their beneficial effects.