Влияние бетулиновой кислоты в сочетании с модуляторами кальциевой сигнализации на рост опухолевых клеток
Ключевые слова:
бетулиновая кислота, опухоль, рак, кальциевый канал, SKF-96365, хлорпромазин, циклоспорин ААннотация
В опытах in vitro показано, что бетулиновая кислота и ее производное подавляют рост клеток глиомы C6 и HeLa, слабо влияя на незлокачественные клетки. Комбинирование этих соединений с модуляторами активности кальциевых каналов (транспортеров) и кальцийсвязывающих белков ‒ SKF-96365, хлорпромазином и циклоспорином А, а также с хелатором ионов кальция EGTA способствует усилению противоопухолевого эффекта по сравнению с таковым при отдельном использовании препаратов. Наиболее выраженный синергизм выявлен в случае совместного применения SKF-96365 с бетулиновой кислотой или ее производным. Данное обстоятельство позволяет предположить, что для реализации противоопухолевого действия бетулиновой кислоты и ее производного не требуется активация ингибируемых SKF-96365, хлорпромазином и циклоспорином А мишеней, включая депоуправляемые каналы, каналы транзиторного рецепторного потенциала, кальмодулин и кальциневрин. Более того, есть вероятность, что чувствительные к SKF-96365 механизмы, а также кальмодулин- и кальциневринзависимые механизмы способствуют росту опухолевых клеток и их устойчивости к бетулиновой кислоте и ее производному. Бетулиновая кислота, ее производное и их комбинации с модуляторами кальциевого гомеостаза могут вызывать повышение, а в ряде случаев снижение уровня цитозольного кальция (Ca2+). Изменения этого показателя не коррелируют однозначно с эффективностью подавления клеточного роста и зависят от типа клеток, использованных препаратов и длительности культивирования. Полученные результаты впервые демонстрируют потенциал комбинированной терапии на основе бетулиновой кислоты (или ее производного) и модуляторов Ca2+-сигнализации.
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