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Insulin resistance in septic rats--a study by the euglycemic clamp technique
L C Iochida1, M Tominaga, M Matsumoto
1Third Department of Internal Medicine, Yamagata University School of Medicine, Japan.
Life Sciences
|January 1, 1989
Summary
Sepsis causes insulin resistance primarily in the liver, not peripheral tissues. This study used rats to show septic liver glucose production remains high despite insulin, indicating hepatic insulin resistance.
Area of Science:
- Metabolic research
- Sepsis pathophysiology
- Endocrinology
Background:
- Sepsis, a life-threatening organ dysfunction caused by dysregulated host response to infection, is associated with metabolic derangements.
- Insulin resistance is a common complication of sepsis, but its precise location and mechanisms remain incompletely understood.
Purpose of the Study:
- To investigate the site of insulin resistance in a rodent model of sepsis.
- To differentiate between peripheral and hepatic insulin sensitivity during septic conditions.
Main Methods:
- Male Wistar rats underwent cecum ligation and perforation to induce sepsis.
- Insulin sensitivity was assessed using the hyperinsulinemic-euglycemic glucose clamp technique with [3H]glucose infusion.
- Peripheral and hepatic glucose metabolism were evaluated, alongside counterregulatory hormone levels.
Main Results:
- Septic rats exhibited impaired suppression of hepatic glucose output in response to insulin infusion compared to control rats.
- Peripheral glucose utilization was not significantly different between septic and control groups.
- Elevated levels of counterregulatory hormones were observed in septic rats.
Conclusions:
- The liver, not peripheral tissues, is the primary site of insulin resistance during sepsis.
- These findings highlight the liver's critical role in sepsis-induced metabolic dysfunction.