Glucose intolerance modifies the inflammatory response after intestinal ischemia-reperfusion

Area of Science:

• Endocrinology
• Gastroenterology
• Immunology

Background:

• Streptozotocin-induced diabetes in newborn rats (nSTZ-rats) models type 2 diabetes with mild insulin deficiency.
• Intestinal ischemia-reperfusion (I-R) is a critical clinical event with significant inflammatory consequences.

Purpose of the Study:

• To investigate inflammatory mediator production differences between healthy and nSTZ-rats following intestinal I-R.
• To assess the impact of pre-existing glucose intolerance on the inflammatory response to I-R.

Main Methods:

• Two-month-old control and nSTZ-rats underwent intestinal I-R or served as controls.
• Plasma and tissue samples were collected from portal vein, cava veins, jejunal wall, and pancreas post-reperfusion.
• Levels of nitric oxide (NO), lipid hydroperoxides (LPO), tumor necrosis factor alpha (TNF-alpha), soluble TNF receptors (sTNF-R1, sTNF-R2), intercellular adhesion molecule-1 (ICAM-1), IL-1, and IL-10 were quantified.

Main Results:

• nSTZ-rats showed significantly elevated plasma concentrations of LPO, NO, ICAM-1, TNF-alpha, and sTNF-R1 after I-R compared to controls.
• Higher levels of TNF-alpha and NO were observed in the suprahepatic cava vein (SCV) compared to infrahepatic cava vein (ICV) and portal vein (PV).
• The jejunal wall of nSTZ-rats exhibited increased TNF-alpha, IL-1, and IL-10 levels post-I-R, indicating localized inflammation.

Conclusions:

• A pre-existing state of glucose intolerance, as modeled in nSTZ-rats, intensifies the inflammatory response to intestinal I-R.
• This heightened response involves increased production of key inflammatory mediators in both systemic circulation and the affected intestinal tissue.
• Findings highlight the vulnerability of diabetic models to ischemic injury and the role of inflammation in exacerbating damage.