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Intestinal epithelial c-Maf expression determines enterocyte differentiation and nutrient uptake in mice
Catalina Cosovanu1, Philipp Resch1, Stefan Jordan1
1Department of Microbiology, Infectious Diseases and Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany.
The Journal of Experimental Medicine
|September 19, 2022
Summary
We discovered c-Maf, a key transcription factor, is crucial for small intestine enterocyte differentiation and nutrient absorption. Its absence impairs nutrient uptake and affects the gut
Area of Science:
- Gastroenterology and Molecular Biology
- Intestinal epithelial cell biology
- Nutrient absorption mechanisms
Background:
- The small intestine (SI) is vital for nutrient absorption and energy balance.
- Enterocytes are the primary cells responsible for nutrient sensing and uptake in the SI.
- Molecular regulators of enterocyte function remain largely undefined.
Purpose of the Study:
- To identify molecular regulators governing enterocyte function in the small intestine.
- To investigate the role of transcription factor c-Maf in enterocyte differentiation and nutrient absorption.
- To understand the impact of c-Maf on the intestinal immune system and microbiota.
Main Methods:
- Identification of c-Maf as an enterocyte-specific transcription factor.
- Analysis of c-Maf expression in relation to signaling pathways (Noggin/BMP) and nutrient transporters.
- Functional studies involving c-Maf deletion in epithelial cells.
- Assessment of enterocyte differentiation, nutrient uptake, immune cell populations, and microbial composition.
Main Results:
- c-Maf is an enterocyte-specific transcription factor in the SI epithelium, regulated by Noggin/BMP signals.
- c-Maf is essential for enterocyte differentiation along the villus axis and controls carbohydrate and protein absorption gene programs.
- Epithelial cell-specific c-Maf deletion leads to impaired enterocyte maturation, nutrient uptake, and adaptation to nutrient availability.
- c-Maf deficiency results in reduced intraepithelial lymphocytes and overgrowth of commensal bacteria (SFB).
Conclusions:
- c-Maf is a critical regulator of small intestine enterocyte differentiation and function.
- c-Maf plays a vital role in maintaining nutrient homeostasis, immune balance, and microbial composition within the gut.
- These findings highlight the intricate interplay between the intestinal epithelium, immune system, and microbiota, orchestrated by c-Maf.
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