首页> 美国卫生研究院文献>Biochemical Journal >Effects of lysophospholipids on Ca2+ transport in rat liver mitochondria incubated at physiological Ca2+ concentrations in the presence of Mg2+ phosphate and ATP at 37 degrees C.
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Effects of lysophospholipids on Ca2+ transport in rat liver mitochondria incubated at physiological Ca2+ concentrations in the presence of Mg2+ phosphate and ATP at 37 degrees C.

机译:溶血磷脂对在37 Ca下在Mg2 +磷酸盐和ATP存在的条件下以生理Ca2 +浓度孵育的大鼠肝线粒体中Ca2 +转运的影响。

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摘要

Lysophospholipids caused the release of 45Ca2+ from isolated rat liver mitochondria incubated at 37 degrees C in the presence of low concentrations of free Ca2+, ATP, Mg2+, and phosphate ions. The concentrations of lysophosphatidylethanolamine, lysophosphatidylcholine, lysophosphatidic acid and lysophosphatidylinositol which gave half-maximal effects were 5, 26, 40 and 56 microM, respectively. The effects of lysophosphatidylethanolamine were not associated with a significant impairment of the integrity of the mitochondria as monitored by measurement of membrane potential and the rate of respiration. Lysophosphatidylethanolamine did not induce the release of Ca2+ from a microsomal fraction, or enhance Ca2+ inflow across the plasma membrane of intact cells, but did release Ca2+ from an homogenate prepared from isolated hepatocytes and incubated under the same conditions as isolated mitochondria. The proportion of mitochondrial 45Ca2+ released by lysophosphatidylethanolamine was not markedly affected by altering the total amount of Ca2+ in the mitochondria, the concentration of extramitochondrial Mg2+, by the addition of Ruthenium Red, or when oleoyl lysophosphatidylethanolamine was employed instead of the palmitoyl derivative. The effects of 5 microM-lysophosphatidylethanolamine were reversed by washing the mitochondria. The possibility that lysophosphatidylethanolamine acts to release Ca2+ from mitochondria in intact hepatocytes following the binding of Ca2+-dependent hormones to the plasma membrane is briefly discussed.
机译:溶血磷脂导致在低浓度的游离Ca2 +,ATP,Mg2 +和磷酸根离子存在下于37摄氏度下孵育的大鼠肝脏线粒体释放出45Ca2 +。产生最大作用的一半的溶血磷脂酰乙醇胺,溶血磷脂酰胆碱,溶血磷脂酸和溶血磷脂酰肌醇的浓度分别为5、26、40和56μM。溶血磷脂酰乙醇胺的作用与膜电位和呼吸速率的测量所监测的线粒体完整性的严重损害无关。溶血磷脂酰乙醇胺不会诱导微粒体部分释放Ca2 +,也不会增强完整细胞质膜上Ca2 +的流入,但会从分离的肝细胞制备的匀浆中释放Ca2 +,并在与分离的线粒体相同的条件下孵育。改变线粒体中Ca2 +的总量,线粒体Mg2 +的浓度,添加钌红或使用油酰基溶血磷脂酰乙醇胺代替棕榈酰衍生物时,溶血磷脂酰乙醇胺释放的线粒体45Ca2 +的比例不受显着影响。通过洗涤线粒体可逆转5 microM-溶血磷脂酰乙醇胺的作用。简要讨论了依赖于Ca2 +的激素与质膜结合后,溶血磷脂酰乙醇胺在完整肝细胞中从线粒体释放Ca2 +的可能性。

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