title: Effect of dopamine receptor 1 on apoptosis of cultured neonatal rat cardiomyocytes in simulated ischaemia/reperfusion.
abstract: Dopamine receptors exist in many tissues, including rat cardiac tissue. However, the physiological importance of dopamine receptors in the homeostatic regulation of cardiac function is unclear. In this study, a model of ischaemia/reperfusion was established by culturing primary neonatal rat cardiomyocytes in ischaemia-mimetic solution for 2 hr, followed by incubation in normal culture medium for 24 hr. Lactate dehydrogenase activity, superoxide dismutase activity and malondialdehyde content were determined colorimetrically with a spectrophotometer. Apoptotic cell death was assayed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labelling staining and flow cytometry, and morphological alterations were observed with transmission electron microscopy. The intracellular free calcium concentration ([Ca2+]i) was measured by confocal laser scanning microscopy. Finally, the expression of dopamine receptor 1 (DR1), caspase-3, -8 and -9, Fas, Fas ligand and Bcl-2 and the release of cytochrome c were analysed by Western blot. The results showed that DR1 expression was increased markedly during ischaemia/reperfusion. Treatment with 10 microM SKF-38393 (DR1 agonist) significantly increased lactate dehydrogenase activity, decreased superoxide dismutase activity and increased malondialdehyde content in the culture medium. The DR1 agonist promoted the release of cytochrome c, accumulation of [Ca2+]i, and apoptosis induced by ischaemia/reperfusion. Furthermore, SKF-38393 up-regulated the expression of caspase-3, -8 and -9, Fas and Fas ligand, and down-regulated Bcl-2 expression. In contrast, 10 microM SCH-23390 (DR1 antagonist) had no significant effects on the above indicators. In conclusion, DR1 activation is involved in the apoptosis of cultured neonatal rat cardiomyocytes in simulated ischaemia/reperfusion through the mitochondrial and death receptor pathways.
authors.affiliation: Department of Pathophysiology, Harbin Medical University, Harbin, China.
authors.forename: Hong-zhu
authors.initials: HZ
authors.lastname: Li
authors.forename: Li-ping
authors.initials: LP
authors.lastname: Han
authors.forename: Chun-ming
authors.initials: CM
authors.lastname: Jiang
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Ya-jun
authors.initials: YJ
authors.lastname: Zhao
authors.forename: Jun
authors.initials: J
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Lin
authors.forename: Shu-xia
authors.initials: SX
authors.lastname: Ma
authors.forename: Ye
authors.initials: Y
authors.lastname: Tian
authors.forename: Bao-feng
authors.initials: BF
authors.lastname: Yang
authors.forename: Chang-qing
authors.initials: CQ
authors.lastname: Xu
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D017209:Apoptosis / Q000502:physiology*; D015153:Blotting, Western; D002118:Calcium / Q000378:metabolism; D020169:Caspases / Q000378:metabolism; D002478:Cells, Cultured; D045304:Cytochromes c / Q000378:metabolism; D004195:Disease Models, Animal; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D008929:Mitochondria, Heart / Q000378:metabolism; D015428:Myocardial Reperfusion Injury / Q000378:metabolism / Q000473:pathology*; D032383:Myocytes, Cardiac / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D053218:Receptors, Death Domain / Q000378:metabolism; D017447:Receptors, Dopamine D1 / Q000235:genetics* / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D053218:Receptors, Death Domain; D017447:Receptors, Dopamine D1; D008315:Malondialdehyde; D045304:Cytochromes c; D007770:L-Lactate Dehydrogenase; D013482:Superoxide Dismutase; D020169:Caspases; D002118:Calcium