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Updated: Sep 27, 2026
Oxygen-Induced Retinopathy Model for Ischemic Retinal Diseases in Rodents
Published on: September 16, 2020
Retinal dehydrogenase-2 is inhibited by compounds that induce congenital diaphragmatic hernias in rodents
Jörg Mey1, Randal P Babiuk, Robin Clugston
1Institut für Biologie II, Aachen, Germany.
Abstract:
Currently, the etiology of the serious developmental anomaly congenital diaphragmatic hernia (CDH) is unknown. We have used an animal model of CDH to address this issue. We characterized four separate teratogens that produced diaphragmatic defects in embryonic rats that are similar to those in infants with CDH. We then tested the hypothesis that all these agents share the common mechanism of perturbing the retinoid-signaling pathway. Specifically, inhibition of retinal dehydrogenase-2 (RALDH2), a key enzyme necessary for the production of retinoic acid and that is expressed in the developing diaphragm, was assayed by measuring retinoic acid production in cytosolic extracts from an oligodendrocyte cell line. The following compounds all induce posterolateral defects in the rat diaphragm; nitrofen, 4-biphenyl carboxylic acid, bisdiamine, and SB-210661. Importantly, we demonstrate that they all share the common mechanism of inhibiting RALDH2. These data provide an important component of mounting evidence suggesting that the retinoid system warrants consideration in future studies of the etiology of CDH.
Insights
Congenital diaphragmatic hernia (CDH) causes are unknown. This study found four teratogens inhibit retinal dehydrogenase-2 (RALDH2), suggesting retinoid signaling disruption in CDH development.
Area of Science:
- Developmental biology
- Teratology
- Biochemistry
Background:
- Congenital diaphragmatic hernia (CDH) is a severe birth defect with an unknown cause.
- Understanding CDH etiology is crucial for developing preventative strategies and treatments.
Purpose of the Study:
- To investigate the underlying molecular mechanisms of CDH using an animal model.
- To test the hypothesis that teratogens causing CDH share a common mechanism involving retinoid signaling.
Main Methods:
- Utilized an established rat model of CDH.
- Characterized four teratogens (nitrofen, 4-biphenyl carboxylic acid, bisdiamine, SB-210661) that induce diaphragmatic defects.
- Assayed inhibition of retinal dehydrogenase-2 (RALDH2) by measuring retinoic acid production in cytosolic extracts.
Main Results:
- All four tested teratogens induced posterolateral diaphragmatic defects in embryonic rats.
- Demonstrated that these teratogens share a common mechanism of inhibiting RALDH2, a key enzyme in retinoic acid synthesis.
- RALDH2 is expressed in the developing diaphragm, linking its inhibition to CDH pathogenesis.
Conclusions:
- Perturbation of the retinoid signaling pathway, specifically RALDH2 inhibition, is a shared mechanism among teratogens causing CDH.
- These findings provide critical insights into the etiology of CDH.
- The retinoid system should be considered in future research on CDH development.
