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Published on: August 14, 2013
Hyperglycemia contributes to cardiac dysfunction in a lipopolysaccharide-induced systemic inflammation model
Satoshi Hagiwara1, Hideo Iwasaka, Akira Hasegawa
1Department of Anesthesiology and Intensive Care Medicine, Oita University Faculty of Medicine, 1-1 Idaigaoka-Hasamamachi, Yufu City, Oita, Japan. saku@med.oita-u.ac.jp
Hyperglycemia worsens cardiac function during inflammation, but insulin therapy mitigates these effects. This study in rats shows insulin protects against inflammation and improves heart function, highlighting its therapeutic potential.
Area of Science:
- Cardiovascular Physiology
- Endocrinology
- Inflammation Research
Background:
- Hyperglycemia is common in critically ill non-diabetic patients.
- Insulin therapy reduces mortality in critical illnesses.
Purpose of the Study:
- To investigate the impact of hyperglycemia and insulin treatment on cardiac function.
- To examine these effects in a rat model of lipopolysaccharide (LPS)-induced systemic inflammation.
Main Methods:
- Rats were administered LPS, with or without insulin and glucose.
- Cardiac function was assessed in Langendorff-perfused hearts.
- Serum cytokine, nitrate/nitrite, and high-mobility group box 1 levels were measured.
Main Results:
- LPS increased inflammatory markers (cytokines, nitrate/nitrite, HMGB1).
- Hyperglycemia impaired cardiac function, indicated by reduced +dP/dtmax and -dP/dtmin.
- Insulin treatment reduced inflammation and improved cardiac function parameters.
Conclusions:
- Hyperglycemia induces inflammation and cardiac dysfunction.
- Insulin therapy protects against inflammation and cardiac dysfunction in this model.
- Insulin's benefits stem from neutralizing hyperglycemia's effects and direct anti-inflammatory actions.
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