Molecular heterogeneity of protein kinase C expression in human ventricle.
Molecular heterogeneity of protein kinase C expression in human ventricle.
复制标题
人心室中蛋白激酶 C 表达的分子异质性。
DOI：
10.1016/s0008-6363(00)00185-1
复制
发表时间：
2000
影响因子：
10.8
通讯作者：
Murray,KT
中科院分区：
文献类型：
--
作者：
Shin,HG;Barnett,JV;Chang,P;Reddy,S;Drinkwater,DC;Pierson,RN;Wiley,RG;Murray,KT
Objective:Although activation of protein kinase C (PKC) modulates the function of normal cardiac myocytes and likely plays a role in the pathogenesis of cardiomyopathic disease states, the molecular basis of PKC expression in human ventricle has not been examined in detail.Methods:We have performed Western analysis and immunohistochemistry on explanted human cardiac tissue from nondiseased and diseased specimens using isoform-specific antibodies directed against all known PKC isozymes.Results:In homogenates from left and right ventricle, all isoforms except PKC-γ and θ were detected by immunoblotting, with confirmation using a second antibody directed against a different epitope when possible. For PKC-βII, δ, and ε, data indicated that these isoforms were variably phosphorylated in vivo, resulting in multiple bands during immunoblotting. Because of potential antibody cross-reactivity, reverse transcriptase polymerase chain reaction (RT-PCR) was performed which confirmed expression of PKC-α, βI, and ζ. Immunohistochemistry demonstrated that all isoforms detected in ventricular homogenate by Western analysis could be localized to cardiac myocytes. From a methodologic standpoint, significant degradation of PKC isoforms could be demonstrated when samples were either frozen or allowed to remain at room temperature, compared to immediate subcellular fractionation.Conclusions:These findings indicate that the PKC expression in human ventricular myocytes is remarkably diverse, with multiple conventional, novel, and atypical isoforms present, and highlight the importance of sample preparation in comparative studies of PKC isoform expression.
