Phospholipid composition and Ca2+ uptake properties of plasma membrane isolated from canine stomach smooth muscle.
The Ca2+ uptake and phospholipids influencing it in plasma membrane isolated from canine stomach smooth muscle was investigated. The major phospholipids in plasma membrane were phosphatidylethanolamine (PE, 26%), phosphatidylcholine (PC, 20%) and phosphatidylserine + phosphatidylinositol (PS + PI, 15%). The cholesterol/phospholipid ratio in the membrane was 0.64. ATP-dependent Ca2+ uptake was inhibited by exogenous PE, PC and PS, but increased by PI. Saponin and phospholipase C inhibited ATP-dependent Ca2+ uptake and accelerated release of Ca2+ from actively loaded plasma membrane vesicles. In the absence of ATP, PE slightly and PI significantly increased Ca2+ uptake, but PC and PS did not affect the Ca2+ uptake. Release of Ca2+ from actively loaded vesicles was 5 times greater in the presence of PI than in its absence. Results suggest PI to be the most active of the tested phospholipids in influencing Ca2+ movement across plasma membrane.
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002463:Cell Membrane Permeability; D004285:Dogs; D005753:Gastric Mucosa / Q000378:metabolism; D008563:Membrane Lipids / Q000032:analysis*; D009130:Muscle, Smooth / Q000378:metabolism*; D010743:Phospholipids / Q000032:analysis*; D012503:Saponins / Q000494:pharmacology; D010738:Type C Phospholipases / Q000494:pharmacology
D008563:Membrane Lipids; D010743:Phospholipids; D012503:Saponins; D010738:Type C Phospholipases; D002118:Calcium