Development of Mouse Models for Ménétrier's Disease.

Area of Science:

• Gastroenterology
• Molecular Biology
• Oncology

Background:

• Ménétrier's disease (MD) is a rare premalignant gastric disorder with unknown etiology.
• Increased transforming growth factor-alpha (TGFα) expression is observed in MD patients.
• Current MD mouse models have limitations in recapitulating disease mechanisms.

Purpose of the Study:

• To develop and validate novel mouse models for studying MD pathogenesis.
• To investigate the molecular mechanisms underlying MD, including cell differentiation and metaplasia.
• To provide tools for evaluating potential therapeutic strategies for MD.

Main Methods:

• Development of a doxycycline-inducible TGFα mouse model (Doxi-TGFα).
• Utilizing Metallothionein (MT)-TGFα transgenic mice for comparison.
• Employing lineage tracing with Mist1-CreERT2 to study cell origins of metaplasia.

Main Results:

• The Doxi-TGFα model recapitulates key MD features like foveolar hyperplasia and parietal cell loss.
• Spasmolytic polypeptide-expressing metaplasia (SPEM) is induced in MD models and originates from chief cells.
• TGFα overexpression impacts chief cell differentiation by suppressing Mist1 expression.

Conclusions:

• Both MT-TGFα and Doxi-TGFα mouse models serve as valuable in vivo tools for MD research.
• The Doxi-TGFα model offers a controllable system for studying TGFα's role in MD and other tissues.
• These models facilitate deeper understanding of MD pathogenesis and the development of targeted therapies.