Melatonin prevents peritoneal adhesions in rats

Area of Science:

• Surgical Complications
• Endocrinology
• Inflammation Research

Background:

• Intra-abdominal adhesions are a common postoperative complication after abdominal surgery, potentially leading to intestinal obstruction and infertility.
• Melatonin, a pineal gland hormone, possesses significant antioxidant properties and is known to mitigate inflammation in various models.
• The study investigates the potential of melatonin in managing peritoneal adhesions, a significant clinical challenge.

Purpose of the Study:

• To evaluate the efficacy of melatonin in preventing or reducing the formation of peritoneal adhesions in a rat model.
• To explore the role of melatonin's antioxidant properties in the context of post-surgical adhesion development.

Main Methods:

• Twenty-eight male Sprague-Dawley rats were divided into four groups, with pinealectomy (PINX) performed on half the animals.
• Peritoneal adhesions were induced via cecal incision and suturing 15 days post-PINX.
• Melatonin (5 mg/kg daily) was administered orally to some groups post-surgery for 15 days, followed by adhesion scoring and tissue analysis for malondialdehyde and hydroxyproline.

Main Results:

• Pinealectomy significantly increased peritoneal adhesion density compared to controls.
• Exogenous melatonin administration markedly reduced adhesion formation in both pinealectomized and intact rats.
• Tissue analysis indicated melatonin's impact on oxidative stress markers associated with adhesion formation.

Conclusions:

• Melatonin demonstrates a significant protective effect against peritoneal adhesion formation in rats.
• The findings suggest melatonin's antioxidant activity plays a crucial role in preventing post-surgical adhesions.
• Melatonin may represent a novel therapeutic agent for mitigating intra-abdominal adhesions.