Interruptin C, a Radioprotective Agent, Derived from Cyclosorus terminans Protect Normal Breast MCF-10A and Human Keratinocyte HaCaT Cells against Radiation-Induced Damage

Abstract

Radiotherapy is a common method to treat cancers, with the goal of maximizing the dose to tumors while minimizing the dose to normal tissues. Radioprotectors can reduce the toxicity to normal tissues during radiotherapy. Several plant-derived compounds can function as radioprotectors by scavenging free radicals. We investigated the radioprotective activity of interruptin C from the fern Cyclosorus terminans. The molecular mechanism of interruptin C’s activity in X-ray-irradiated cells was evaluated. Superoxide dismutase activity was examined to investigate the antioxidant enzyme activity. Clonogenic cell survival was also investigated following radiation exposure. DNA damage and cell cycle progression were detected using micronuclei formation assays. DNA repair after irradiation was analyzed in a γH2AX assay. The levels of the proteins related to the radioprotective responses were analyzed by Western blotting. Interruptin C increased the antioxidant enzyme activity and significantly decreased the DNA damage by reducing the γH2AX foci and micronucleus formation in irradiated MCF-10A normal breast and HaCaT human keratinocyte cells. The apoptotic protein levels decreased, whereas the antiapoptotic protein levels increased. Interruptin C pretreatment increased the survival rate of irradiated MCF-10A and HaCaT cells. Moreover, the compound did not promote the survival of MDA-MB-231 and Hs578T breast cancer cells. Therefore, interruptin C may exert radioprotective activity without enhancing cancer cell proliferation.

Acute oral toxicological evaluation in Wistar rats of interruptin-rich extract from Cyclosorus terminans and its in vitro antidiabetic potential

“…Moreover, they also revealed a powerful capability for intracellular ROS scavenging and anti-apoptotic impact against extracellular oxidative injury by H2O2 (Kaewsuwan et al, 2015). Recently, interruptin C has been indicated as a radioprotective agent on breast MCF-10A and human keratinocyte HaCaT cells (Chumsuwan et al, 2022). Intriguingly, interruptin B was found to encourage brown adipocyte differentiation and induce glucose consumption in adipocytes differentiated from human adipose-derived stem cells (ASCs) by acting as a dual PPARα and γ ligand (Kaewsuwan et al, 2016).…”