Effects of cyclic nucleotides, calcium ionophore, and phorbol ester on vitellogenin mRNA levels in incubated ovarian fragments of the kuruma prawn Marsupenaeus japonicus

Apr 21, 2006General and comparative endocrinology

How chemical signals affect egg protein gene levels in incubated ovarian tissue of kuruma prawns

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Abstract

After 24 hours of incubation, various pharmacological agents decreased VTG mRNA levels in the ovarian fragments of the kuruma prawn.

  • Calcium ionophores, cyclic nucleotides, and protein kinase C activators are associated with the intracellular signalling pathways that regulate VTG synthesis.
  • The inhibitory effects on VTG mRNA levels were more pronounced in previtellogenic ovaries compared to vitellogenic ovaries.
  • The study suggests that responsiveness to the vitellogenesis-inhibiting hormone changes during ovarian development.
  • Maturity-related changes in cellular signalling mechanisms may influence the degree of responsiveness to the vitellogenesis-inhibiting hormone.

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