Comparative biochemistry and physiology. Part A, Molecular & integrative physiology

Retinoic acid's role in controlling egg yolk production in the freshwater edible crab

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Abstract

Injection of 13-cis retinoic acid (CRA) significantly increased ovarian index, oocyte diameter, and ovarian vitellogenin levels in avitellogenic crabs.

  • CRA injection led to higher secretory rates of mandibular organs and Y-organs.
  • Circulatory levels of methyl farnesoate and ecdysteroids significantly increased following CRA administration.
  • Increased amounts of Retinoid X Receptor, Ecdysteroid Receptor, E75, and vitellogenin mRNAs were observed in the hepatopancreas after CRA treatment.
  • Mandibular organ and Y-organ explants secreted more methyl farnesoate and ecdysteroids when incubated with CRA.
  • These findings suggest that CRA may stimulate the synthesis of ecdysteroids and methyl farnesoate, possibly enhancing vitellogenin gene expression and ovarian maturation.

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