PMID: 9535508Apr 16, 1998Paper

Retinoic acid-induced caudal regression syndrome in the mouse fetus

Reproductive Toxicology
R Padmanabhan

Abstract

Caudal regression syndrome (CRS) comprises developmental anomalies of the caudal vertebrae, neural tube, urogenital and digestive organs, and hind limbs, the precursors of all of which are derived from the caudal eminence. Although the syndrome is well recognized, the etiology and pathogenetic mechanisms are poorly understood. Genetic and experimental models may provide some important clues to the early events that precede the dysmorphogenesis in CRS. The objectives of this study were to determine the susceptible stages for induction of CRS and to ascertain the early events that precede the development of this syndrome in a mouse model. Single oral doses of 100, 150, or 200 mg/kg retinoic acid (RA) were administered to TO mice on one of Gestation Days (GD) 8 to 12, and fetuses were observed on GD 18. All doses administered on GD 8 or 9 resulted in CRS in a large number of survivors. Agenesis of the tail, caudal vertebral defects, spina bifida occulta/aperta, imperforate anus, rectovesicle or rectourethral fistula, renal malformations, cryptorchidism, gastroschisis, and limb malformations, including the classical mermaid syndrome (sirenomelia), were characteristic features of this animal model. Several craniofacial malformations...Continue Reading

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