NPPB prevents postoperative peritoneal adhesion formation by blocking volume-activated Cl^- current

Area of Science:

• Biomedical Science
• Surgical Complications Research
• Pharmacology

Background:

• Peritoneal adhesion is a common and problematic complication following abdominal surgery.
• Adhesions can lead to chronic pain, intestinal obstruction, and infertility, posing significant clinical challenges.
• Current strategies for preventing peritoneal adhesions have limitations.

Purpose of the Study:

• To investigate the efficacy of 5-Nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) in preventing peritoneal adhesions.
• To elucidate the underlying cellular and molecular mechanisms of NPPB's action on adhesion fibroblasts.

Main Methods:

• Peritoneal adhesion model induced in rats via mechanical injury.
• In vitro assessment of adhesion fibroblast (AFB) proliferation (MTT assay) and migration (wound-healing assay).
• Electrophysiological recordings (patch-clamp) of chloride currents (I_Cl,vol) and cell volume analysis.

Main Results:

• NPPB significantly reduced the formation of peritoneal adhesions in a rat model.
• NPPB inhibited AFB proliferation and migration in a dose-dependent manner (IC₅₀ = 53.09 μM for migration).
• NPPB blocked volume-regulated anion currents (I_Cl,vol) and impaired regulatory volume decrease (RVD) in AFB cells.

Conclusions:

• NPPB demonstrates significant potential in preventing postoperative peritoneal adhesions.
• The mechanism involves the inhibition of fibroblast proliferation and migration via modulation of chloride currents and cell volume.
• NPPB represents a promising therapeutic agent for clinical application in reducing peritoneal adhesion formation.