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Pflügers Archiv - European Journal of Physiology

, Volume 469, Issue 12, pp 1663–1673 | Cite as

The reduced myofilament responsiveness to calcium contributes to the negative force-frequency relationship in rat cardiomyocytes: role of reactive oxygen species and p-38 map kinase

  • María Sofía Espejo
  • Ignacio Aiello
  • Marisa Sepúlveda
  • Martín G. Vila Petroff
  • Ernesto A. AielloEmail author
  • Verónica C. De GiustiEmail author
Signaling and cell physiology
Part of the following topical collections:
  1. Signaling and cell physiology

Abstract

The force-frequency relationship (FFR) is an important intrinsic regulatory mechanism of cardiac contractility. However, a decrease (negative FFR) or no effect (flat FFR) on contractile force in response to an elevation of heart rate is present in the normal rat or in human heart failure. Reactive oxygen species (ROS) can act as intracellular signaling molecules activating diverse kinases as calcium-calmodulin-dependent protein kinase II (CaMKII) and p-38 MAP kinase (p-38K). Our aim was to elucidate the intracellular molecules implicated in the FFR of isolated rat ventricular myocytes. The myocytes were field-stimulated via two-platinum electrodes. Sarcomere length was recorded with a video camera. Ca2+ transients and intracellular pHi were recorded by epifluorescence. Increasing frequency from 0.5 to 3 Hz decreased cell shortening without changes in pHi. This negative FFR was changed to positive FFR when the myocytes were pre-incubated with the ROS scavenger MPG, the NADPH oxidase blocker apocynin, or by inhibiting mitochondrial ROS production with 5-HD. Similar results were obtained when the cells were pre-incubated with the CaMKII blocker, KN-93, or the p-38K inhibitor, SB-202190. Consistently, the levels of phosphorylation of p-38K and the oxidation of CaMKII were significantly higher at 2 Hz than at 0.5 Hz. Despite the presence of positive inotropic effect during stimulation frequency enhancement, Ca2+ transient amplitudes were reduced in MPG- and SB-202190-treated myocytes. In conclusion, our results indicate that the activation of the intracellular pathway involving ROS-CaMKII-p-38K contributes to the negative FFR of rat cardiomyocytes, likely by desensitizing the response of contractile myofilaments to Ca2+.

Keywords

Rat ventricular myocytes Reactive oxygen species p38 MAP kinase Negative staircase Contractility 

Notes

Compliance with ethical standards

All experiments were performed in accordance with the Guide for the Care and Use of Laboratory Animals (NIH Publication No. 85-23, revised 1996) and approved by the Institutional Animal Care and Use Committee of La Plata University.

Supplementary material

424_2017_2058_MOESM1_ESM.doc (520 kb)
ESM 1 (DOC 520 kb).

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • María Sofía Espejo
    • 1
  • Ignacio Aiello
    • 1
  • Marisa Sepúlveda
    • 1
  • Martín G. Vila Petroff
    • 1
  • Ernesto A. Aiello
    • 1
    Email author
  • Verónica C. De Giusti
    • 1
    Email author
  1. 1.Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani”, Facultad de Ciencias MédicasUniversidad Nacional de La Plata-CONICETLa PlataArgentina

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