Corilagin attenuates intestinal ischemia/reperfusion injury in mice by inhibiting ferritinophagy-mediated ferroptosis through disrupting NCOA4-ferritin interaction

Abstract

Aims: Intestinal ischemia reperfusion (II/R) is a common clinical emergency. Ferroptosis is reported to play a role in II/R injury. Our previous studies revealed that corilagin significantly attenuates intestinal ischemia/reperfusion injuries. However, the underlying molecular mechanism is unclear and requires further study.

Materials and methods: DAO, GSSG/T-GSH, MDA, and Fe²⁺ were measured by assay kits, 4-HNE was assessed by IHC, and 15-LOX was measured by ELISA. Mitochondrial damage was observed by TEM and cellular oxidation levels were detected by C11-BODIPY 581/591 and DHE probes. LC3, p62, Beclin1, ACSL4, GPX4, NCOA4, and ferritin expression were examined by WB in vivo and in vitro. IF, co-IF, q-PCR, and constructed NCOA4-knock-down IEC-6 cells were used to evaluate the role of NCOA4 in the effect of corilagin against II/R injury. Temporal and nucleoplasmic variations with or without corilagin were observed by WB. Co-IP and molecular docking were used to investigate the NCOA4-ferritin interaction.

Key findings: Corilagin attenuated II/R-induced ferroptosis both in vitro and in vivo. Further study revealed that the anti-ferroptosis bioactivity of corilagin might be due to the modulation of iron homeostasis via inhibition of ferritinophagy in an NCOA4-dependent manner.

Significance: Corilagin might be a potential therapeutic agent for II/R-induced tissue injury.

Keywords: Corilagin; Corilagin (PubChem CID: 73568); Erastin (PubChem CID: 11214940); Ferritinophagy; Ferroptosis; Ferrostatin-1 (pubchem CID:4068248); Ischemia-reperfusion; LY294002 (PubChem CID: 3973); MG-132 (PubChem CID: 462382); NCOA4; Nigericin (PubChem CID: 16760591).