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Published on: March 8, 2015
MIND4-17 protects retinal pigment epithelium cells and retinal ganglion cells from UV
Chaopeng Li1, Kang Yan2, Wenqi Wang1
1Department of Ophthalmology, Huai'an First People's Hospital, Nanjing Medical University, Huai'an, China.
Abstract:
Nrf2 activation would efficiently protect retinal cells from UV radiation (UVR). Recent studies have developed a Nrf2-targeting thiazole-containing compound MIND4-17, which activates Nrf2 through blocking its association with Keap1. In the current study, we demonstrated that pretreatment with MIND4-17 efficiently protected retinal pigment epithelium (RPE) cells (RPEs) and retinal ganglion cells (RGCs) from UVR. UVR-induced apoptosis in the retinal cells was also largely attenuated by MIND4-17 pretreatment. MIND4-17 presumably separated Nrf2 from Keap1, allowing its stabilization and accumulation in retinal cells, which then translocated to cell nuclei and promoted transcription of ARE-dependent anti-oxidant genes, including HO1, NQO1 and GCLM. Significantly, shRNA-mediated knockdown of Nrf2 almost completely abolished MIND4-17-induced cytoprotection against UVR. Further studies showed that MIND4-17 largely ameliorated UVR-induced ROS production, lipid peroxidation and DNA damages in RPEs and RGCs. Together, MIND4-17 protects retinal cells from UVR by activating Nrf2 signaling.
Insights
The compound MIND4-17 protects retinal cells from UV radiation by activating the Nrf2 pathway. This activation reduces cell death, oxidative stress, and DNA damage, offering a potential therapeutic strategy for UV-induced retinal injury.
Area of Science:
- Ophthalmology
- Molecular Biology
- Toxicology
Background:
- UV radiation (UVR) poses a significant threat to retinal cells.
- Nrf2 activation is a key cellular defense mechanism against oxidative stress.
- The compound MIND4-17 targets the Nrf2 pathway by inhibiting Keap1.
Purpose of the Study:
- To investigate the protective effects of MIND4-17 against UVR-induced damage in retinal cells.
- To elucidate the molecular mechanisms underlying MIND4-17's protective action.
Main Methods:
- Retinal pigment epithelium (RPE) and retinal ganglion cells (RGCs) were pretreated with MIND4-17.
- Cells were subsequently exposed to UVR.
- Nrf2 expression, apoptosis, oxidative stress markers (ROS, lipid peroxidation, DNA damage), and antioxidant gene transcription were assessed.
- Nrf2 knockdown was performed using shRNA to confirm its role.
Main Results:
- MIND4-17 pretreatment significantly protected RPEs and RGCs from UVR-induced cell death.
- Apoptosis, ROS production, lipid peroxidation, and DNA damage were markedly reduced by MIND4-17.
- MIND4-17 treatment led to Nrf2 stabilization and nuclear translocation, upregulating antioxidant genes (HO1, NQO1, GCLM).
- Nrf2 knockdown abrogated the protective effects of MIND4-17.
Conclusions:
- MIND4-17 effectively protects retinal cells against UVR by activating the Nrf2 signaling pathway.
- This compound ameliorates UVR-induced oxidative stress and DNA damage.
- MIND4-17 represents a promising therapeutic agent for preventing UV-related retinal damage.
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