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Article

KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes

  • Authors:
    • Lei Zhang
    • Hongxin Wang
    • Meili Lu
    • Guoqiang Wu
    • Yuhong Yang
    • Chunna Liu
    • L. N. Maslov
  • View Affiliations / Copyright

    Affiliations: Key Laboratory of Molecular Biology and Drug Research, Liaoning Medical College, Jinzhou 121001, P.R. China, Laboratory of Experimental Cardiology, Institute of Cardiology, Tomsk 634012, Russia
  • Pages: 261-266
    |
    Published online on: May 16, 2012
       https://doi.org/10.3892/etm.2012.578
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Abstract

Recent evidence suggests that κ-opioid receptor (OR) agonists and KATP channel activation exert antihypertrophic effects on cardiac myocytes. We studied the role of KATP channels in the antihypertrophic effects of ORs in primary cultures of neonatal rat ventricular myocytes exposed for 48 h to the α1 adrenoceptor agonist phenylephrine and the relative contributions of mitochondrial KATP (mitoKATP) and sarcolemmal KATP (sarcKATP). Furthermore, we elucidated the pathway between ORs and KATP channels and their impact on intracellular Ca2+ ([Ca2+]i) transients. Hypertrophy of cardiomyocytes was characterized by increases in i) total protein content; ii) cell size and iii) [3H]leucine incorporation. Phenylephrine (10 µM) increased the three parameters. Trans-(±)-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl)-cyclohexyl]-benzeneacetamid methanesulfonate salt (U50,488H), a selective κ-opioid receptor agonist, prevented phenylephrine-induced hypertrophy and [Ca2+]i transients. The effect of U50,488H was abolished by nor-binaltorphimine, a selective κ-OR antagonist, indicating that the effect was κ-OR-mediated. The protein kinase C inhibitor chelerythrine and the KATP channel inhibitors glibenclamide (50 µM), a nonselective KATP antagonist, and 5-hydroxydecanoic acid (100 µM), a mitochondrial selective KATP antagonist, reversed the antihypertrophic effect of U50,488H, and there was no significant difference between the two KATP channel blockers. Moreover, we also determined the expression of the Kir6.2 subunits of the KATP channel, which increased in response to U50,488H in the presence of phenylephrine, but was suppressed by chelerythrine, glibenclamide and 5-hydroxydecanoic acid. U50,488H also attenuated the elevation of [Ca2+]i. This study suggests that KATP, and particularly the mitochondrial KATP, mediates the antihypertrophic effects of κ-opioid receptor stimulation via the PKC signaling pathway.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang L, Wang H, Lu M, Wu G, Yang Y, Liu C and Maslov LN: KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes. Exp Ther Med 4: 261-266, 2012.
APA
Zhang, L., Wang, H., Lu, M., Wu, G., Yang, Y., Liu, C., & Maslov, L.N. (2012). KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes. Experimental and Therapeutic Medicine, 4, 261-266. https://doi.org/10.3892/etm.2012.578
MLA
Zhang, L., Wang, H., Lu, M., Wu, G., Yang, Y., Liu, C., Maslov, L. N."KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes". Experimental and Therapeutic Medicine 4.2 (2012): 261-266.
Chicago
Zhang, L., Wang, H., Lu, M., Wu, G., Yang, Y., Liu, C., Maslov, L. N."KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes". Experimental and Therapeutic Medicine 4, no. 2 (2012): 261-266. https://doi.org/10.3892/etm.2012.578
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang L, Wang H, Lu M, Wu G, Yang Y, Liu C and Maslov LN: KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes. Exp Ther Med 4: 261-266, 2012.
APA
Zhang, L., Wang, H., Lu, M., Wu, G., Yang, Y., Liu, C., & Maslov, L.N. (2012). KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes. Experimental and Therapeutic Medicine, 4, 261-266. https://doi.org/10.3892/etm.2012.578
MLA
Zhang, L., Wang, H., Lu, M., Wu, G., Yang, Y., Liu, C., Maslov, L. N."KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes". Experimental and Therapeutic Medicine 4.2 (2012): 261-266.
Chicago
Zhang, L., Wang, H., Lu, M., Wu, G., Yang, Y., Liu, C., Maslov, L. N."KATP channels mediate the antihypertrophic effects afforded by κ-opioid receptor stimulation in neonatal rat ventricular myocytes". Experimental and Therapeutic Medicine 4, no. 2 (2012): 261-266. https://doi.org/10.3892/etm.2012.578
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