Vitamin A deficiency induces congenital spinal deformities in rats

PLoS One. 2012;7(10):e46565. doi: 10.1371/journal.pone.0046565. Epub 2012 Oct 5.

Abstract

Most cases of congenital spinal deformities were sporadic and without strong evidence of heritability. The etiology of congenital spinal deformities is still elusive and assumed to be multi-factorial. The current study seeks to elucidate the effect of maternal vitamin A deficiency and the production of congenital spinal deformities in the offsping. Thirty two female rats were randomized into two groups: control group, which was fed a normal diet; vitamin A deficient group, which were given vitamin A-deficient diet from at least 2 weeks before mating till delivery. Three random neonatal rats from each group were killed the next day of parturition. Female rats were fed an AIN-93G diet sufficient in vitamin A to feed the rest of neonates for two weeks until euthanasia. Serum levels of vitamin A were assessed in the adult and filial rats. Anteroposterior (AP) spine radiographs were obtained at week 2 after delivery to evaluate the presence of the skeletal abnormalities especially of spinal deformities. Liver and vertebral body expression of retinaldehyde dehydrogenase (RALDHs) and RARs mRNA was assessed by reverse transcription-real time PCR. VAD neonates displayed many skeletal malformations in the cervical, thoracic, the pelvic and sacral and limbs regions. The incidence of congenital scoliosis was 13.79% (8/58) in the filial rats of vitamin A deficiency group and 0% in the control group. Furthermore, vitamin A deficiency negatively regulate the liver and verterbral body mRNA levels of RALDH1, RALDH2, RALDH3, RAR-α, RAR-β and RAR-γ. Vitamin A deficiency in pregnancy may induce congenital spinal deformities in the postnatal rats. The decreases of RALDHs and RARs mRNA expression induced by vitamin A deprivation suggest that vertebral birth defects may be caused by a defect in RA signaling pathway during somitogenesis.

MeSH terms

  • Animals
  • Bone and Bones / abnormalities
  • Bone and Bones / diagnostic imaging
  • Diet
  • Female
  • Gene Expression
  • Liver / enzymology
  • Male
  • Maternal-Fetal Exchange
  • Pregnancy
  • Prenatal Exposure Delayed Effects / diagnostic imaging
  • Prenatal Exposure Delayed Effects / etiology
  • Prenatal Exposure Delayed Effects / pathology*
  • Radiography
  • Random Allocation
  • Rats
  • Rats, Wistar
  • Receptors, Retinoic Acid / genetics
  • Receptors, Retinoic Acid / metabolism
  • Retinal Dehydrogenase / genetics
  • Retinal Dehydrogenase / metabolism
  • Spine / abnormalities*
  • Spine / diagnostic imaging
  • Spine / enzymology
  • Vitamin A / blood
  • Vitamin A Deficiency / blood*

Substances

  • Receptors, Retinoic Acid
  • Vitamin A
  • Retinal Dehydrogenase

Grants and funding

The authors have no support or funding to report.