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Long H, Xiong Y, Liu H, Yang M, Liu T, Gong C, Li S. IL-6 Exacerbates Oxidative Damage of RPE Cells by Indirectly Destabilizing the mRNA of DNA Repair Genes. Inflammation 2024:10.1007/s10753-024-02192-2. [PMID: 39581910 DOI: 10.1007/s10753-024-02192-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2024] [Revised: 11/13/2024] [Accepted: 11/13/2024] [Indexed: 11/26/2024]
Abstract
Chronic inflammation has been associated with the progression of age-related macular degeneration (AMD) and diabetic retinopathy (DR), and the levels of various inflammatory factors are significantly increased in intraocular fluids of patients with AMD and DR. Therefore, elucidating the roles of inflammatory factors in the oxidative damage of RPE cells will help uncover the pathogenesis of AMD and DR. We have previously demonstrated that E2F1 plays an important role in the antioxidant capacity of RPE cells. Here, our transcriptome analysis shows that E2F1 affected the expressions of DNA repair genes in RPE cells. In addition, we found that E2F1 transactivated the splicing factor SRSF1. SRSF1 knockdown promoted DNA oxidative damage and apoptosis and decreased the mRNA stability of DNA repair genes XRCC2, POLK and LIG4 in RPE cells. Moreover, we found that SRSF1 could bind to the RNA stabilizing factor MATR3, and knockdown of the latter affected the mRNA stability of these DNA repair genes. Notably, interleukin-6 (IL-6), an inflammatory factor upregulated in intraocular fluids of patients with AMD and DR, decreased SRSF1 expression by inducing acetylation of E2F1 at the K125 position. Consistently, SRSF1 overexpression relieved IL-6-induced DNA oxidative damage and apoptosis in RPE cells. In vivo experiment results also confirmed that IL-6 could aggravate retinal oxidative damage. In conclusion, high levels of IL-6 in the eyes of patients with AMD and DR destabilize the mRNAs of DNA repair genes by disrupting the expression of SRSF1, leading to abnormal repair of DNA oxidative damage in RPE cells.
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Affiliation(s)
- Huirong Long
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China
| | - Yucong Xiong
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China
| | - Haiyu Liu
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China
| | - Meiling Yang
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China
| | - Ting Liu
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China
| | - Chaoju Gong
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China.
| | - Suyan Li
- Xuzhou Key Laboratory of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China.
- Department of Ophthalmology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou First People's Hospital, Eye Institute of Xuzhou, Xuzhou, 221100, China.
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Abstract
In this issue of Science Signaling, Temprine et al report that up-regulation of the translesion DNA polymerase Polκ mediates resistance to BRAF pathway-targeted inhibitors and starvation in melanoma cells. These results exemplify the role that Polκ plays in cellular adaptation to stress.
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Affiliation(s)
- Joann B Sweasy
- University of Arizona Cancer Center, University of Arizona, Tucson, AZ 85719, USA.,Department of Cellular and Molecular Medicine and Radiation Oncology, University of Arizona, Tucson, AZ 85721, USA.,Department of Radiation Oncology, University of Arizona, Tucson, AZ 85724, USA.
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