Biochemical mechanisms of calcium mobilisation induced by mastoparan and chimeric hormone-mastoparan constructs

Clare L. Longland, Mokdad Mezna, Ülo Langel, Mattias Hällbrink, Ursel Soomets, Mark Wheatley, Francesco Michelangeli, John Howl

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Ca2+ efflux, Ca2+-ATPase, and membrane permeability measurements were used to investigate the biochemical mechanisms of Ca2+ release induced by mastoparan (MP) and the chimeric hormone-Mp constructs incorporating galanin (galparan) or vasopressin antagonist (M375 and M391) moieties. Comparative studies utilised preparations of porcine cerebellar microsomes and rabbit skeletal muscle sarcoplasmic reticulum (SR), MP and chimeric peptides galparan, M375 and M391 induce Ca2+ release over a range of concentrations from 0.3-10 μM. Comparison of MP and three chimeric, N-terminal extended, constructs indicates that N-terminal extension modifies the biological properties of MP, producing changes in efficacy which are enzyme-isoform-specific. Biochemical studies indicate that the chimeric analogues and MP inhibit Ca2+-ATPases and directly activate the ryanodine receptor (RyR) to release Ca2+ from both heavy SR (HSR) and microsomes. The same peptides have no effect on the InsP3 receptor (InsP3,R), Other actions that include modest changes in membrane permeability may also contribute to the Ca2+-mobilising action of MP and chimeric constructs.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalCell Calcium
Issue number1
Publication statusPublished - Jul 1998
Externally publishedYes

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cell Biology


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