Functional relations of crab molt-inhibiting hormone and neurohypophysial peptides

Mark P. Mattson, Eugene Spaziani

Research output: Contribution to journalArticle

Abstract

Biological and immunological relationships between molt-inhibiting hormone (MIH) activity in eyestalk ganglia extracts of the crab, Cancer antennarius Stimpson, and peptides of the vasopressin-oxytocin family were assessed. Lysine vasopressin (LVP), arginine vasopressin (AVP), vasotocin (VT), and oxytocin (OT) mimicked MIH action by inhibiting ecdysteroid production of Y-organ segments in vitro with the relative potencies LVP>AVP>VT>>>OT. The inhibitory effect was reversible and specific (6 other peptides did not alter Y-organ activity). MIH and LVP increased Y-organ cyclic adenosine 3′,5′ monophosphate (cAMP) levels dose-dependently and with identical time course in which the rise in cAMP preceded inhibition of ecdysteroid production. The synthetic vasopressin antidiuretic agonist 1-deamino-8-D-AVP (dDAVP) inhibited Y-organ steroidogenesis dose-dependently; the vasopressin analog ([1(B-mercapto-β,β-cyclopentamethylenepropionic acid), 2-(O-methyl)tyrosine[AVP) (d(CH2)5Tyr(Me)AVP), a vasopressor antagonist, had no effect on basal or MIH-suppressed steroidogensis. AVP antiserum abolished the inhibitory action of MIH, LVP, and AVP. Competitive binding curves for MIH, LVP, AVP, VT, and OT with the AVP antiserum suggested that MIH is most closely related to LVP. MIH may be structurally related to the vasopressins and act on Y-organ cells via type V2 (cAMP-linked) receptors.

Original languageEnglish (US)
Pages (from-to)635-640
Number of pages6
JournalPeptides
Volume6
Issue number4
DOIs
StatePublished - 1985
Externally publishedYes

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Keywords

  • Cancer antennarius
  • Cyclic AMP
  • Ecdysteroids
  • Oxytocin
  • Vasopressin
  • Vasotocin
  • Y-Organs

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology
  • Cellular and Molecular Neuroscience

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