Electrically stimulated contraction accelerates protein synthesis rates in adult feline cardiocytes

C. T. Ivester, R. L. Kent, H. Tagawa, Hiroyuki Tsutsui, T. Imamura, G. Cooper IV, P. J. McDermott

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Cardiocytes were induced to contract via electrical field stimulation with an 8 V/cm electrical square-wave pulse of 5 ms at 0.125-2.0 Hz for up to 6 h. Protein synthesis rates were measured as rate of incorporation of [3H]- phenylalanine into total cell protein. Rates of protein synthesis were accelerated 43 ± 4%, P < 0.001, by 4 h. The acceleration of total protein synthesis showed a frequency dependence between 0.125 and 0.5 Hz. In addition to accelerating rates of total protein synthesis, electrical stimulation of contraction accelerated fractional rates of synthesis of myosin heavy chain by 42 ± 8%, P < 0.05. Protein synthesis rates were not accelerated upon electrical stimulation using subthreshold voltages. Addition of 100 ng/ml of actinomycin D had no effect on the ability of electrical stimulation of contraction to accelerate protein synthesis. To uncouple excitation- contraction coupling, 2,3-butanedione monoxime (BDM) was used to block actin- myosin cross-bridge interactions. BDM significantly decreased the ability of electrical stimulation to accelerate protein synthesis rates.

Original languageEnglish
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume265
Issue number2 34-2
Publication statusPublished - Jan 1 1993
Externally publishedYes

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Felidae
Electric Stimulation
Proteins
Excitation Contraction Coupling
Myosin Heavy Chains
Dactinomycin
Myosins
Phenylalanine
Actins

All Science Journal Classification (ASJC) codes

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

Electrically stimulated contraction accelerates protein synthesis rates in adult feline cardiocytes. / Ivester, C. T.; Kent, R. L.; Tagawa, H.; Tsutsui, Hiroyuki; Imamura, T.; Cooper IV, G.; McDermott, P. J.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 265, No. 2 34-2, 01.01.1993.

Research output: Contribution to journalArticle

Ivester, C. T. ; Kent, R. L. ; Tagawa, H. ; Tsutsui, Hiroyuki ; Imamura, T. ; Cooper IV, G. ; McDermott, P. J. / Electrically stimulated contraction accelerates protein synthesis rates in adult feline cardiocytes. In: American Journal of Physiology - Heart and Circulatory Physiology. 1993 ; Vol. 265, No. 2 34-2.
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AU - Ivester, C. T.

AU - Kent, R. L.

AU - Tagawa, H.

AU - Tsutsui, Hiroyuki

AU - Imamura, T.

AU - Cooper IV, G.

AU - McDermott, P. J.

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N2 - Cardiocytes were induced to contract via electrical field stimulation with an 8 V/cm electrical square-wave pulse of 5 ms at 0.125-2.0 Hz for up to 6 h. Protein synthesis rates were measured as rate of incorporation of [3H]- phenylalanine into total cell protein. Rates of protein synthesis were accelerated 43 ± 4%, P < 0.001, by 4 h. The acceleration of total protein synthesis showed a frequency dependence between 0.125 and 0.5 Hz. In addition to accelerating rates of total protein synthesis, electrical stimulation of contraction accelerated fractional rates of synthesis of myosin heavy chain by 42 ± 8%, P < 0.05. Protein synthesis rates were not accelerated upon electrical stimulation using subthreshold voltages. Addition of 100 ng/ml of actinomycin D had no effect on the ability of electrical stimulation of contraction to accelerate protein synthesis. To uncouple excitation- contraction coupling, 2,3-butanedione monoxime (BDM) was used to block actin- myosin cross-bridge interactions. BDM significantly decreased the ability of electrical stimulation to accelerate protein synthesis rates.

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