Distinct human small intestinal microbiome communities underlie visceral hypersensitivity in a humanized mouse model

Area of Science:

• Microbiology
• Neurogastroenterology
• Gastroenterology

Background:

• The gut microbiota plays a crucial role in maintaining gastrointestinal health.
• Alterations in gut bacteria composition are linked to various functional gastrointestinal disorders.
• The precise mechanisms by which microbiota induce symptoms like abdominal pain are not fully understood.

Purpose of the Study:

• To investigate the role of specific small-intestinal bacteria in triggering abdominal pain.
• To elucidate the cellular and neural pathways involved in microbiota-induced gut sensitivity.
• To understand the contribution of gut microbiota to the pathophysiology of gastrointestinal symptoms.

Main Methods:

• Utilized mouse models with specific bacterial colonization of the small intestine.
• Employed electrophysiological recordings to assess the activation of gut sensory and nerve cells.
• Analyzed the expression of key signaling molecules involved in visceral pain.

Main Results:

• Specific small-intestinal bacteria, notably Enterobacteriaceae, were found to significantly activate gut sensory neurons.
• Activation of these neurons was directly linked to the induction of abdominal pain-related behaviors.
• The study identified specific bacterial metabolites or components responsible for initiating the neural response.

Conclusions:

• Enterobacteriaceae and potentially other specific small-intestinal bacteria can directly activate gut sensory pathways.
• This activation mechanism provides a direct link between gut microbiota composition and the generation of abdominal pain.
• Targeting specific bacterial populations or their signaling pathways may offer novel therapeutic strategies for gastrointestinal disorders.