Dynamic expression of retinoic acid-synthesizing and -metabolizing enzymes in the developing mouse inner ear.

The Journal of Comparative Neurology
Raymond RomandEri Hashino

Abstract

Retinoic acid signaling plays essential roles in morphogenesis and neural development through transcriptional regulation of downstream target genes. It is believed that the balance between the activities of synthesizing and metabolizing enzymes determines the amount of active retinoic acid to which a developing tissue is exposed. In this study, we investigated spatiotemporal expression patterns of four synthesizing enzymes, the retinaldehyde dehydrogenases 1, 2, 3, and 4 (Raldh1, Raldh2, Raldh3, and Raldh4) and two metabolizing enzymes (Cyp26A1 and Cyp26B1) in the embryonic and postnatal mouse inner ear by using quantitative reverse transcriptase polymerase chain reaction (RT-PCR), in situ hybridization, and Western blot analysis. Quantitative RT-PCR analysis and Western blot data revealed that the expression of CYP26s was much higher than that of Raldhs at early embryonic ages but that Cyp26 expression was downregulated during embryonic development. Conversely, the expression levels of Raldh2 and -3 increased during development and were significantly higher than the Cyp26 levels at postnatal day 20. At this age, Raldh3 was expressed predominantly in the cochlea, whereas Raldh2 was present in the vestibular end organ. At early ...Continue Reading

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May 30, 2009·BMC Developmental Biology·Evan M BraunsteinBernice E Morrow
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