TY - JOUR
T1 - Biochemical mechanisms of calcium mobilisation induced by mastoparan and chimeric hormone-mastoparan constructs
AU - Longland, Clare L.
AU - Mezna, Mokdad
AU - Langel, Ülo
AU - Hällbrink, Mattias
AU - Soomets, Ursel
AU - Wheatley, Mark
AU - Michelangeli, Francesco
AU - Howl, John
PY - 1998/7
Y1 - 1998/7
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0031786656&partnerID=8YFLogxK
U2 - 10.1016/S0143-4160(98)90086-0
DO - 10.1016/S0143-4160(98)90086-0
M3 - Article
C2 - 9793686
AN - SCOPUS:0031786656
SN - 0143-4160
VL - 24
SP - 27
EP - 34
JO - Cell Calcium
JF - Cell Calcium
IS - 1
ER -