Adiponectin affects ileal contractility of mouse preparations

Area of Science:

• Gastroenterology
• Endocrinology
• Neuroscience

Background:

• Adiponectin (ADPN) is known to reduce gastric motility, acting as a peripheral satiety signal.
• Peripheral satiety signals also originate from the small intestine, but ADPN's role here is unexplored.

Purpose of the Study:

• To investigate the effects of ADPN on murine ileal contractility.
• To identify ADPN receptors in the ileum and their cellular localization.

Main Methods:

• In vitro recording of mechanical responses in isolated murine ileal preparations.
• Electrical field stimulation (EFS) to assess neural control of contractility.
• Immunofluorescence and Western blot to detect ADPN receptor expression and localization.

Main Results:

• ADPN reduced spontaneous and EFS-induced ileal contractility.
• These inhibitory effects were abolished by nitric oxide (NO) synthesis inhibition.
• AdipoR1, but not AdipoR2, was expressed in ileal preparations, localized to enteric glial cells.

Conclusions:

• ADPN exerts inhibitory effects on the mouse ileum, likely mediated by AdipoR1 on enteric glial cells and NO.
• This ileal inhibitory action of ADPN may function as an additional peripheral satiety signal.
• This mechanism could contribute to ADPN's central anorexigenic effects.