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Involvement of c-Jun N-terminal kinases activation in diabetic embryopathy

Peixin Yang1, Zhiyong Zhao, E Albert Reece

  • 1Department of Obstetrics, Gynecology & Reproductive Sciences, University of Maryland School of Medicine, 655 W. Baltimore Street, Baltimore, MD 21201, USA. Pyang@upi.umaryland.edu

Biochemical and Biophysical Research Communications
|April 24, 2007
PubMed

Insights

Diabetic embryopathy involves increased JNK1/2 activation. Inhibiting this pathway or using JNK2 knockout mice significantly reduces birth defects, suggesting JNK is a key mediator.

Area of Science:

  • Developmental Biology
  • Endocrinology
  • Pharmacology

Background:

  • Diabetic embryopathy, a serious complication of diabetes, has poorly understood mechanisms.
  • Increased c-Jun N-terminal kinase (JNK) activation is observed in diabetic embryopathy.

Purpose of the Study:

  • To investigate the role of JNK signaling pathway in the development of diabetic embryopathy.
  • To determine if JNK activation is sufficient to cause embryonic malformations.

Main Methods:

  • Utilized diabetic wild-type (WT) and Jnk2 null mutant (JNKKO) mice models.
  • Administered JNK inhibitor (SP600125) and JNK activator (sorbitol) in embryo cultures.
  • Quantified malformation rates in embryos under various experimental conditions.

Main Results:

  • Hyperglycemia significantly increased embryonic malformation rates (15.6-fold in WT).
  • JNK inhibitor SP600125 dose-dependently reduced hyperglycemia-induced embryopathy.
  • JNKKO mice showed a 71% reduction in malformation rates under diabetic conditions.
  • Embryos exposed to JNK activator (sorbitol) exhibited significantly higher malformation rates.

Conclusions:

  • JNK activation is a critical mediator of diabetic embryopathy.
  • JNK activation alone can induce embryonic anomalies, mimicking hyperglycemia's teratogenic effects.
  • Targeting JNK signaling presents a potential therapeutic strategy for preventing diabetic embryopathy.

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