Role of adenosine triphosphate and protein kinase A in the force-frequency relationship in isolated rat cardiomyocytes

Authors

DOI:

https://doi.org/10.2298/ABS221213004O

Keywords:

adenosine triphosphate, protein kinase A, frequency, contraction, Ca2

Abstract

Paper description:

  • There is insufficient information about the force-frequency relationship in isolated cardiomyocytes and the available information is contradictory. We investigated the force-frequency relationship in contraction and the reasons for the conflicting results.
  • Contraction and Ca2+ transients were recorded at 1, 2, 4 Hz excitation frequencies.
  • The increase in frequency caused a decrease in the amplitude of contraction, a prolongation of the relaxation time, a slowdown in the relaxation rate, and an increase in the diastolic Ca2+
  • Energy deficiency and lack of β-adrenergic system regulation may play a role in these changes.

Abstract: The physiological heart rate of rodents is around 4-6 Hz, although a stimulus frequency of 1 Hz is generally used in isolated cardiomyocytes to study changes in the contraction-relaxation cycle in cardiac muscle physiology and pathophysiology. Our study investigated the contraction parameters in isolated cardiomyocytes at 1, 2 and 4 Hz stimulation, and the roles of ATP and protein kinase A (PKA) in the force-frequency relationship in isolated cardiomyocytes. The contraction of the cell and intracellular Ca2+ changes were recorded simultaneously during cell stimulation by applying pulses of 6-8 V amplitude with frequencies of 1, 2 and 4 Hz. The increase in stimulus frequency caused a significant decrease in the percentage of shortening, relaxation times, slowing of the relaxation rate, and a significant increase in diastolic Ca2+ levels, but had no effect on the contraction rate and Ca2+ transients. Administration of ATP and N6-benzoyladenosine-3ʹ-5ʹ-cyclic monophosphate (6-BNZ-cAMP) caused an increase in contraction amplitude and speed which were proportional to the stimulus frequency but had no effect on the relaxation times. The experimental results show that the force-stimulus frequency has a negative correlation in isolated myocytes and that energy metabolism and the β-adrenergic system may be responsible for this relationship.

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Published

2023-04-03

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1.
Ozturk N, Erkan O, Uslu S, Ozdemir S. Role of adenosine triphosphate and protein kinase A in the force-frequency relationship in isolated rat cardiomyocytes. Arch Biol Sci [Internet]. 2023Apr.3 [cited 2024Apr.24];75(1):47-56. Available from: https://serbiosoc.org.rs/arch/index.php/abs/article/view/8232

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Vol. 75 No. 1 (2023)

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Copyright (c) 2023 Nihal Ozturk, Orhan Erkan, Serkan Uslu, Semir Ozdemir

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