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The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
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Impaired glucose homeostasis after a transient intermittent hypoxic exposure in neonatal rats

Eung-Kwon Pae1, Bhoomika Ahuja, Marieyerie Kim

  • 1UCLA, School of Dentistry, LA, CA 90095, United States.

Biochemical and Biophysical Research Communications
|November 5, 2013
PubMed

Insights

Neonatal intermittent hypoxia (IH) exposure in rats creates a lasting diabetes-like condition. This study shows IH disrupts glucose homeostasis and lowers insulin levels in young rats without causing inflammation.

Area of Science:

  • Endocrinology
  • Neonatal physiology
  • Metabolic disorders

Background:

  • Intermittent hypoxia (IH) is linked to various health issues.
  • Neonatal exposure to IH may have long-term metabolic consequences.
  • Understanding early-life IH effects is crucial for preventing metabolic diseases.

Purpose of the Study:

  • To establish a neonatal rat model for studying the effects of transient intermittent hypoxia (IH).
  • To investigate the long-term impact of neonatal IH exposure on glucose homeostasis and insulin regulation.
  • To determine if neonatal IH induces diabetes-like conditions in young rats.

Main Methods:

  • Neonatal male rat pups were exposed to transient intermittent hypoxia (IH) for 5 hours on postnatal day 1.
  • IH involved alternating oxygen levels between 10.3% and 20.8%.
  • Treated rats were compared to age-matched controls after 3 weeks in normal oxygen.

Main Results:

  • IH-exposed rats showed significantly higher fasting glucose levels (237.00 ± 19.66 mg/dL vs. 167.25 ± 2.95 mg/dL).
  • Insulin levels were significantly lower in IH-exposed rats (807.0 ± 72.5 pg/mL vs. 1839.8 ± 377.6 pg/mL).
  • Glucose tolerance tests revealed disturbed glucose homeostasis, with decreased C-peptide secretion (914 pM vs. 809 pM).

Conclusions:

  • Neonatal exposure to transient IH can induce a persistent diabetes-like condition in rats.
  • IH exposure disrupts glucose homeostasis and insulin secretion without affecting beta-cell mass or causing inflammation.
  • This model provides insights into early-life IH-induced metabolic dysregulation.

Keywords:
DiabetesGAD65IHILIntermittent hypoxiaNeonatal modelPancreatic beta cellsglutamate decarboxylase65interleukinintermittent hypoxia

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