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A Model of Chronic Nutrient Infusion in the Rat
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Persistent hyperglycemia modulates gut immune function and microbiota in rats.

Katsuya Mori1, Takeshi Suzuki1, Toru Igarashi1

  • 1Department of Anesthesiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582 Japan.

Journal of Intensive Care
|July 25, 2015
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Summary

Persistent hyperglycemia impacts gut immunity and microbiota. This study found high blood sugar amplified inflammation and altered immune cell differentiation in rats, affecting gut bacteria composition.

Keywords:
CD4+ T lymphocyte subsetsGut barrier functionMesenteric lymph nodesPro-inflammatory cytokine

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Area of Science:

  • Immunology
  • Microbiology
  • Metabolic Disorders

Background:

  • Hyperglycemia can cause cellular dysfunction, potentially altering immune system responses.
  • The study investigates how hyperglycemia affects immune responses like inflammation and CD4(+) T lymphocyte differentiation in mesenteric lymph nodes (MLNs).
  • It also examines hyperglycemia's impact on gut microbiota under normal and pathological conditions.

Purpose of the Study:

  • To test if hyperglycemia amplifies aberrant immune responses, including inflammation and CD4(+) T lymphocyte differentiation in MLNs.
  • To determine if hyperglycemia alters gut microbiota composition.
  • To investigate these effects under both physiological and pathological (endotoxemia) conditions.

Main Methods:

  • Male Wistar rats were divided into four groups: control, endotoxemia (lipopolysaccharide), and endotoxemia or control with induced hyperglycemia.
  • Hyperglycemia was induced using glucose solutions, while normoglycemia groups received saline.
  • mRNA expressions of inflammatory cytokines, CD4(+) T lymphocyte transcriptional factors in MLNs, and intestinal microbiota were analyzed after 24 hours.

Main Results:

  • Hyperglycemia (250-350 mg/dL) increased interleukin (IL)-1β and IL-6 mRNA expression in MLNs.
  • Under non-endotoxemic conditions, helper T (Th) 2 and regulatory-T (Treg) transcriptional factors were upregulated.
  • While lipopolysaccharide (LPS) altered specific bacterial populations (Bacteroidetes, Clostridium perfringens, Bacteroides fragilis), hyperglycemia did not exacerbate these LPS-induced changes but did modify L. reuteri and staphylococci populations in healthy rats.

Conclusions:

  • Persistent hyperglycemia significantly modulates gut immune function.
  • Gut microbiota composition is also significantly altered by persistent hyperglycemia.