Home General Physiology and Biophysics 2018 General Physiology and Biophysics Vol.37, No.2, p.223–231, 2018

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Founded: 1982
ISSN  1338-4325 (online)

Published in English

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General Physiology and Biophysics Vol.37, No.2, p.223–231, 2018

Title: Selective inhibition of smooth muscle plasma membrane transport Са2+,Mg2+-АТРase by calixarene C-90 and its activation by IPT-35 compound
Author: Iuliia I. Mazur, Tetyana O. Veklich, Oleksandr A. Shkrabak, Nikolai A. Mohart, Anatoly M. Demchenko, Inna V. Gerashchenko, Roman V. Rodik, Vitaly I. Kalchenko, Sergiy O. Kosterin

Abstract: We investigated the influence of calixarene C-90 and IPT-35 on plasma membrane Ca2+-pumping АТРase (PMCA), intracellular calcium homeostasis and myometrium smooth muscle strain contractions. It has been shown that both effectors (100 µM) affect PMCA enzymatic activity: calixarene C-90 inhibits it by 75% and IPT-35 activates it by 40%. These compounds don’t affect the Mg2+-АТРase, Mg2+-independent Са2+-АТРase and Na+,K+-АТРase enzymatic activities. C-90 inhibition coefficient I0.5 magnitude was approximately 20 µM and the Hill coefficient nH was 0.55. For IPT-35 activation, constant А0.5 was 6.4 and nH was 0.7. Mathematical modeling demonstrated the implication of calixarene C-90 on unexcited myocytes, which allows for a precise change in cytoplasm Ca2+ concentration and an influence on basal muscle tonus. By the same method, we determined that IPT-35 has a little influence on Ca2+ concentration in unexcited myocytes. It was also shown that calixarene C-90 in vitro can increase velocity of oxytocin-initiated contractions, whereas IPT-35 can suppress this aforementioned parameter. These results are promising for the design of new pharmacological compounds as better regulators of uterine contractions. Calixarene C-90 can be used in obstetric cases for the simultaneous use of oxytocin for enhancing uterine contractions, and IPT-35 for its antispasmodic effect on uterine tone.

Keywords: PMCA — Smooth muscle cell — Calixarene — Cyclopenta[d]pirimidine derivative
Published online: 27-Mar-2018
Year: 2018, Volume: 37, Issue: 2 Page From: 223, Page To: 231
Price: 18.00 €

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