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外源性磷脂酸对心室肌细胞钙电流的作用 被引量:3

Effects of exogenous phosphatidic acid on calcium current of ventricular myocytes
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摘要 目的:观察外源性磷脂酸(PA)对豚鼠心室肌细胞钙电流的影响。方法:Langendorff离体心脏逆向灌流法分离豚鼠心室肌细胞,随机选取心室肌细胞分为:正常对照组,PA 0.01、0.1和1.0μmol.L-13个剂量组,百日咳毒素(PTX)0.1 mg.L-1+PA 1.0μmol.L-1组,蛋白激酶C(PKC)阻断剂H-72μmol.L-1+PA 1.0μmol.L-1组。应用全细胞电压钳方法分别记录各组心室肌细胞Ca2+电流。结果:外源性PA 0.01、0.1和1 mmol.L-1分别使豚鼠心室肌细胞L-型钙电流(L-ICa)由给药前的(288.70±28.33)、(290.83±25.12)和(279.54±31.22)pA增加到给药后的(304.10±28.31)(P>0.05)、(349.80±30.13)(P<0.01)和(388.10±28.12)pA(P<0.001);加入G-蛋白耦联受体阻断剂PTX和PKC阻断剂H-7后,PA对Ca2+通道电流的作用与给药前比较差异无显著性。结论:外源性PA可增加豚鼠心室肌细胞的L-ICa电流,其作用机制是通过膜受体-G蛋白-PKC通路发挥作用。 Objective To study the effects of exogenous phosphatidic acid (PA) on calcium current of ventricular myocytes. Methods The Langendorff perfusion method was used to isolate the ventricular myocytes of guinea pigs and thee ventricular myocytes of guinea pigs were randomly divided into control group, three dosage groups of PA 0.01, 0.1 and 1.0 μmol·L^-1 and group of PTX 0.1 mg·L^-1 plus PA 1.0 μmol·L^-land group of H-7 2μmol·L^- plus PA 1.0 μmol·L^-1. The whole cell voltage clamp technique was used to record the calcium current of isolated ventricular myocytes of guinea pigs. Results 0.01, 0.1 and 1.0 μmol·L^-1 PA enhanced the calcium current from (288.70 ± 28.33) pA, (290,83 ±25.12) pA and (279.54 ± 31,22) pA before administration to (304. 10±28.31) pA (P〉0.05), (349, 80±30. 13) pA (P〈0.01) and (388. 10±28.12) pA (P〈0.001) after administration. The effects of PA on the calcium current was blocked by PTX (a G proteincoupled receptor blocking agent) and H-7 (a PKC blocking agent). Conclusion PA can promote the opening of calcium channels of the ventricular myocytes by the pathway of membrane receptor-G protein-PKC in a dosedependent manner,
出处 《吉林大学学报(医学版)》 CAS CSCD 北大核心 2006年第3期422-424,共3页 Journal of Jilin University:Medicine Edition
基金 吉林省科技厅资助课题(吉科合字第19990302)
关键词 钙通道 磷脂酸类 膜片钳术 心肌 calcium channels phosphatidic acids patch-clamp technique myocardium
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参考文献8

  • 1Kroll MH. Second message function of phosphaidic acid in platelet activatin [J]. J Cell Physiol, 1989, 139: 558-564.
  • 2李英骥,赵春燕,张文杰,李欣,卢静,李丽,钟国赣.溶血磷脂酸对豚鼠心肌细胞电压依赖性钾离子通道电流的作用[J].吉林大学学报(医学版),2005,31(2):193-195. 被引量:6
  • 3葛敬岩,赵春燕,张文杰,赵明,孙亚芹,钟国赣.1-磷酸鞘氨醇对豚鼠心室肌细胞钙电流的影响[J].吉林大学学报(医学版),2005,31(1):52-54. 被引量:3
  • 4Pearce B, Jakobson K, Morrow C, et al. Phosphatidic acid promotes phosphatidic metabolism and DNA synthesis in cultured cortical astroctes [J]. Neurochem Int, 1994,24 (2):165-171.
  • 5Xu YJ, Panagia V, Shao Q et al. Phosphatidic acid increases intracellular free Ca^2+ and cardiac conractile force [J]. Am J Physiol, 1996, 271: H651-H659.
  • 6Home AR, Surmeier DJ. Muscarinic receptors modulate N-,P-, L-type Ca^2+ channels in rat striatal neurons through parallel pathways [J]. J Neurosci, 1995, 15:458-469.
  • 7Suidan HS, Nobes CD, Hall A, et al. Astrocyte spreading in response to thrombin and lysophosphatidic acid is dependent on the Rho GTPase [J]. Gila, 1997, 21 (2): 244-252.
  • 8Contos J J, Ishii I, Chun J. Lysophosphatidic acid receptor [J]. Pharmacology, 2000, 58 (6): 1188-1196.

二级参考文献18

  • 1Orrenius S, Nicotera P. The calcium ion and cell death [J].J NeuralTransmSuppl, 1994, 43: 1-11.
  • 2Cabo C, Wit AL. Cellular electrophysiologic mechanisms of cardiac arrhythmias[J]. Cardiol Clin, 1997, 15 (4): 517-538.
  • 3Spiegel S, Milstien A. Sphingosine 1-phosphate, a key cell signaling molecule [J]. J Biochem, 2002, 277 (29): 25851-25854.
  • 4Sanchez T, Hla T. Structural and functional characteristics of SIP receptors [J]. J Cell Biochem, 2004, 92: 913-922.
  • 5Hla T. Physiological and pathological actions of sphingosine 1-phosphate [J]. Semin Cell Dev Biol, 2004, 15 (5): 513-520.
  • 6Mattie M, Brooker G, Spiegel S. Sphingosine-l-phosphate, a putative second messenger, mobilizes calcium from internal stores via an inositol trisphosphate-independent pathway [J].J Biol Chem, 1994, 269: 3181-3188.
  • 7Piacentino V, Dipla K, Gaughan JP, et al. Voltage-dependent Ca2+ release from the SR of feline ventricular myocytes is explained by Ca2+-induced Ca2+ release[J]. J Physiol, 2000,523: 533-548.
  • 8atomi Y, Ozaki Y, Ohmori T, et al. Sphingosine 1-phosphate: synthesis and release [J]. Prostaglandins, 2001,64(1-4): 107-122.
  • 9Yatomi Y, Igarashi Y, Yang L, et al. Sphingosine-1-phosphate, a bioactive sphingolipid abundantly stored in platelets, is a normal constituent of human plasma and serum[J]. J Biochem, 1997, 121: 969-973.
  • 10Pieringer RA, Bonner H, Kunnes RS. Biosynthesis of phosphatidic acid, lysophosphatidic acid, diglyceride, and triglyceride by fatty acyltransferase pathways in Escherichia coli [J]. J Biol Chem, 1967, 242 (11): 2719-2724.

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