Inhibition of Na(+),K(+)-ATPase and activation of myosin ATPase by calix[4]arene C-107 cause stimulation of isolated smooth muscle contractile activity
| Autor: | T. O. Veklich, R. D. Labyntseva, O. A. Shkrabak, O. V. Tsymbalyuk, R. V. Rodik, V. I. Kalchenko, S. O. Kosterin |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | The Ukrainian Biochemical Journal, Vol 92, Iss 1, Pp 21-30 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2409-4943 2413-5003 |
| DOI: | 10.15407/ubj92.01.021 |
| Popis: | The discovery of compounds that might modify myometrial contractility is an important area of researches. In our previous experiments, we found that some representatives of macrocyclic compounds family – calix[4]arenes – can modify the enzymatic and transport activity of membrane-bound cation-transport ATP hydrolases. The aim of this work was to study and compare the effect of calix[4]arene C-107 on the enzymatic activities of Mg2+-dependent ATPases of the uterine smooth muscle, namely: ouabain-sensitive Na+,K+-ATPase, plasma membrane Ca2+-independent “basal” Mg2+-ATPase, ATPase of the actomyosin complex and myosin subfragment-1, with effect on the contractile activity of the myometrium. It was shown that calix[4]arene C-107 efficiently inhibited myometrium Na+,K+-ATPase (I50 = 54 ± 6 nM) selectively to other ATP-hydrolases of the plasma membrane and simultaneously activated the enzymatic activity of the myosin ATPase of smooth muscles (A50 = 9.6 ± 0.7 μM). Such reciprocal biochemical effects led to the stimulation of the smooth muscle contractile activity that was demonstrated by the tensometric method using different isolated smooth muscles. Calix[4]arene С-107 was shown to stimulate the increase of the tonic component of myometrium contractions induced by oxytocin, as well as contractions of the caecum muscles induced by high-potassium solution or acetylcholine, and to maintain increased tension for a long time. Thus, calix[4]arene C-107 is a prospective compound for enhancing the smooth muscle basal tone and/or contraction in case of hypotonic dysfunctions. |
| Databáze: | Directory of Open Access Journals |
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