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The meninges is a source of retinoic acid for the late-developing hindbrain. | LitMetric

AI Article Synopsis

  • * It identifies retinaldehyde dehydrogenase-2 (RALDH2) as a key source of RA in the surrounding meninges and mesenchyme near the developing hindbrain by embryonic day 13, revealing that RA signaling is localized rather than uniform.
  • * The research employs a mouse transgenic model with a lacZ reporter to map RA signaling specifically in the hindbrain, finding significant activity in areas like the cerebellum and precerebellar system, which are close to RA sources.

Article Abstract

One general function for retinoic acid (RA) is pattern organization in the CNS. This regulatory factor has an essential role in spinal cord motor neuron and early posterior hindbrain development. In the anterior CNS, however, there is only a limited number of foci of RA synthesis, and less attention has been placed on regions such as the anterior hindbrain where RA synthesizing enzymes are absent. This study shows that a rich source of RA lies around the hindbrain from the RA synthetic enzyme retinaldehyde dehydrogenase-2 (RALDH2) present in the surrounding meninges and mesenchyme by embryonic day 13. RALDH2 is not distributed uniformly throughout the meninges but is restricted to territories over the developing hindbrain, suggesting that RA signaling may be localized to those regions. Further regulation of RA signaling is provided by the presence of a RA sink in the form of the CYP26B1 RA catabolic enzyme expressed in deeper regions of the brain. As a guide to the neural anatomy of hindbrain RA signaling, we used a mouse transgenic for a lacZ reporter gene driven by a RA response element (RAREhsplacZ) to identify regions of RA signaling. This reporter mouse provides evidence that RA signaling in the hindbrain after embryonic day 13 occurs in the regions of the cerebellum and precerebellar system adjacent to sources of RA, including the inferior olive and the pontine nuclei.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6740759PMC
http://dx.doi.org/10.1523/JNEUROSCI.23-20-07610.2003DOI Listing

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