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. 2017 Jan:117:97-104.
doi: 10.1016/j.steroids.2016.08.011. Epub 2016 Aug 17.

Trilobolide-steroid hybrids: Synthesis, cytotoxic and antimycobacterial activity

Affiliations

Trilobolide-steroid hybrids: Synthesis, cytotoxic and antimycobacterial activity

Michal Jurášek et al. Steroids. 2017 Jan.

Abstract

Sesquiterpene lactone trilobolide is a sarco/endoplasmic reticulum Ca2+-ATPase (SERCA) inhibitor, thus depleting the Ins(1,4,5)P3-sensitive intracellular calcium stores. Here, we describe a synthesis of a series of 6 trilobolide-steroids conjugates (estradiol, pregnene, dehydroepiandrosterone, and testosterone). We found that the newly synthesized Tb-based compounds possess different remarkable biological activities. Cancer cell cytotoxicity and preferential selectivity is represented in our study by a Tb-pregnene derivative. The most cytotoxic clickates of estradiol and pregnene were studied by FACS where impact on cell cycle and RNA synthesis was observed; live-cell microscopy revealed the impact on cell organelle morphology particularly endoplasmic reticulum, mitochondria and nucleus. Further, we have studied the estrogenic and androgenic properties of the clickate molecules using cell-based luciferase assays. Finally, antimycobacterial tests revealed that testosterone and estradiol derivatives potentiated the antimycobacterial activity up to IC50 of 10.6μM.

Keywords: Click chemistry; Cytotoxicity; SAR; Steroid receptor; Steroids; Trilobolide.

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