RGD Reference Report - Intrauterine growth restriction due to uteroplacental insufficiency decreased white matter and altered NMDAR subunit composition in juvenile rat hippocampi. - Rat Genome Database

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Intrauterine growth restriction due to uteroplacental insufficiency decreased white matter and altered NMDAR subunit composition in juvenile rat hippocampi.

Authors: Schober, ME  McKnight, RA  Yu, X  Callaway, CW  Ke, X  Lane, RH 
Citation: Schober ME, etal., Am J Physiol Regul Integr Comp Physiol. 2009 Mar;296(3):R681-92. Epub 2009 Jan 14.
RGD ID: 2326049
Pubmed: (View Article at PubMed) PMID:19144756
DOI: Full-text: DOI:10.1152/ajpregu.90396.2008

Uteroplacental insufficiency (UPI), the major cause of intrauterine growth restriction (IUGR) in developed nations, predisposes to learning impairment. The underlying mechanism is unknown. Neuronal N-methyl-d-aspartate receptors (NMDARs) are critical for synaptogenesis and learning throughout life. We hypothesized that UPI-induced IUGR alters rat hippocampal NMDAR NR2A/NR2B subunit ratio and/or NR1 mRNA isoform expression and synaptic density at day 21 (P21). To test this hypothesis, IUGR was induced by bilateral uterine artery ligation of the late-gestation Sprague-Dawley dam. At P21, hippocampal NMDAR subunit mRNA and protein were measured, as were levels of synaptophysin. Neuronal, synaptic, and glial density in CA1, CA3, and dentate gyrus (DG) was assessed by immunofluorescence. IUGR increased NR1 mRNA isoform NR1-3a and 1-3b expression in both sexes. In P21 males, IUGR increased protein levels of NR1 C2' and decreased NR1 C2, NR2A, and the NR2A-to-NR2B ratio, whereas in females, IUGR increased NR2B protein. In males, IUGR was associated with decreased myelin basic protein-to-neuronal nuclei ratio in CA1, CA3, and DG. We conclude that IUGR has sex-specific effects and that neither neuronal loss nor decreased synaptic density appears to account for the changes in NMDAR subunits. Rather, it is possible that synaptic NMDAR subunit composition is altered. Our results suggest that apparent recovery in the IUGR hippocampus may be associated with synaptic hyperexcitability. We speculate that the NMDAR plays an important role in IUGR-associated cognitive impairment.

Annotation

Disease Annotations    

Objects Annotated

Genes (Rattus norvegicus)
Grin1  (glutamate ionotropic receptor NMDA type subunit 1)
Grin2a  (glutamate ionotropic receptor NMDA type subunit 2A)
Grin2b  (glutamate ionotropic receptor NMDA type subunit 2B)

Genes (Mus musculus)
Grin1  (glutamate receptor, ionotropic, NMDA1 (zeta 1))
Grin2a  (glutamate receptor, ionotropic, NMDA2A (epsilon 1))
Grin2b  (glutamate receptor, ionotropic, NMDA2B (epsilon 2))

Genes (Homo sapiens)
GRIN1  (glutamate ionotropic receptor NMDA type subunit 1)
GRIN2A  (glutamate ionotropic receptor NMDA type subunit 2A)
GRIN2B  (glutamate ionotropic receptor NMDA type subunit 2B)


Additional Information