1
|
Loftus SN, Gharaee-Kermani M, Xu B, Moore TM, Hannoudi A, Mallbris MJ, Klein B, Gudjonsson JE, Kahlenberg JM. Interferon alpha promotes caspase-8 dependent ultraviolet light-mediated keratinocyte apoptosis via interferon regulatory factor 1. Front Immunol 2024; 15:1384606. [PMID: 38660315 PMCID: PMC11039837 DOI: 10.3389/fimmu.2024.1384606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 03/27/2024] [Indexed: 04/26/2024] Open
Abstract
Introduction Ultraviolet (UV) light is a known trigger of both cutaneous and systemic disease manifestations in lupus patients. Lupus skin has elevated expression of type I interferons (IFNs) that promote increased keratinocyte (KC) death after UV exposure. The mechanisms by which KC cell death is increased by type I IFNs are unknown. Methods Here, we examine the specific cell death pathways that are activated in KCs by type I IFN priming and UVB exposure using a variety of pharmacological and genetic approaches. Mice that overexpress Ifnk in the epidermis were exposed to UVB light and cell death was measured. RNA-sequencing from IFN-treated KCs was analyzed to identify candidate genes for further analysis that could drive enhanced cell death responses after UVB exposure. Results We identify enhanced activation of caspase-8 dependent apoptosis, but not other cell death pathways, in type I IFN and UVB-exposed KCs. In vivo, overexpression of epidermal Ifnk resulted in increased apoptosis in murine skin after UVB treatment. This increase in KC apoptosis was not dependent on known death ligands but rather dependent on type I IFN-upregulation of interferon regulatory factor 1 (IRF1). Discussion These data suggest that enhanced sensitivity to UV light exhibited by lupus patients results from type I IFN priming of KCs that drives IRF1 expression resulting in caspase-8 activation and increased apoptosis after minimal exposures to UVB.
Collapse
Affiliation(s)
- Shannon N. Loftus
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
- Graduate Program in Immunology, University of Michigan, Ann Arbor, MI, United States
| | - Mehrnaz Gharaee-Kermani
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
- Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| | - Bin Xu
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Tyson M. Moore
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Andrew Hannoudi
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Mischa J. Mallbris
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Benjamin Klein
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | | | - J. Michelle Kahlenberg
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
- Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| |
Collapse
|
2
|
Klein B, Reynolds MB, Xu B, Gharaee-Kermani M, Gao Y, Berthier CC, Henning S, Loftus SN, McNeely KE, Victory AM, Dobry C, Hile GA, Ma F, Turnier JL, Gudjonsson JE, O’Riordan MX, Kahlenberg JM. Epidermal ZBP1 stabilizes mitochondrial Z-DNA to drive UV-induced IFN signaling in autoimmune photosensitivity. bioRxiv 2024:2024.01.23.576771. [PMID: 38328232 PMCID: PMC10849619 DOI: 10.1101/2024.01.23.576771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Photosensitivity is observed in numerous autoimmune diseases and drives poor quality of life and disease flares. Elevated epidermal type I interferon (IFN) production primes for photosensitivity and enhanced inflammation, but the substrates that sustain and amplify this cycle remain undefined. Here, we show that IFN-induced Z-DNA binding protein 1 (ZBP1) stabilizes ultraviolet (UV)B-induced cytosolic Z-DNA derived from oxidized mitochondrial DNA. ZBP1 is significantly upregulated in the epidermis of adult and pediatric patients with autoimmune photosensitivity. Strikingly, lupus keratinocytes accumulate extensive cytosolic Z-DNA after UVB, and transfection of keratinocytes with Z-DNA results in stronger IFN production through cGAS-STING activation compared to B-DNA. ZBP1 knockdown abrogates UV-induced IFN responses, whereas overexpression results in a lupus-like phenotype with spontaneous Z-DNA accumulation and IFN production. Our results highlight Z-DNA and ZBP1 as critical mediators for UVB-induced inflammation and uncover how type I IFNs prime for cutaneous inflammation in photosensitivity.
Collapse
Affiliation(s)
- Benjamin Klein
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Mack B. Reynolds
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor
| | - Bin Xu
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Mehrnaz Gharaee-Kermani
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
- Department of Dermatology, University of Michigan, Ann Arbor, Michigan
| | - Yiqing Gao
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Celine C. Berthier
- Division of Nephrology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Svenja Henning
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Shannon N. Loftus
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Kelsey E. McNeely
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Amanda M. Victory
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Craig Dobry
- Department of Dermatology, University of Michigan, Ann Arbor, Michigan
| | - Grace A. Hile
- Department of Dermatology, University of Michigan, Ann Arbor, Michigan
| | - Feiyang Ma
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
- Department of Dermatology, University of Michigan, Ann Arbor, Michigan
| | - Jessica L. Turnier
- Division of Pediatric Rheumatology, Department of Pediatrics, University of Michigan, Ann Arbor
| | | | - Mary X. O’Riordan
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor
| | - J. Michelle Kahlenberg
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor
- Department of Dermatology, University of Michigan, Ann Arbor, Michigan
| |
Collapse
|
3
|
Loftus SN, Liu J, Berthier CC, Gudjonsson JE, Gharaee-Kermani M, Tsoi LC, Kahlenberg JM. Loss of interleukin-1 beta is not protective in the lupus-prone NZM2328 mouse model. Front Immunol 2023; 14:1162799. [PMID: 37261358 PMCID: PMC10227599 DOI: 10.3389/fimmu.2023.1162799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 04/21/2023] [Indexed: 06/02/2023] Open
Abstract
Aberrant activation of the innate immune system is a known driver of lupus pathogenesis. Inhibition of the inflammasome and its downstream signaling components in murine models of lupus has been shown to reduce the severity of disease. Interleukin-1 beta (IL-1β) is a proinflammatory cytokine released from cells following inflammasome activation. Here, we examine how loss of IL-1β affects disease severity in the lupus-prone NZM2328 mouse model. We observed a sex-biased increase in immune complex deposition in the kidneys of female mice in the absence of IL-1β that corresponds to worsened proteinuria. Loss of IL-1β did not result in changes in overall survival, anti-dsDNA autoantibody production, or renal immune cell infiltration. RNA-sequencing analysis identified upregulation of TNF and IL-17 signaling pathways specifically in females lacking IL-1β. Increases in these signaling pathways were also found in female patients with lupus nephritis, suggesting clinical relevance for upregulation of these pathways. Together, these data suggest that inhibition of the inflammasome or its downstream elements that block IL-1β signaling may need to be approached with caution in SLE, especially in patients with renal involvement to prevent potential disease exacerbation.
Collapse
Affiliation(s)
- Shannon N. Loftus
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
- Graduate Program in Immunology, University of Michigan, Ann Arbor, MI, United States
| | - Jianhua Liu
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Celine C. Berthier
- Division of Nephrology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | | | - Mehrnaz Gharaee-Kermani
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
- Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| | - Lam C. Tsoi
- Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, United States
- Department of Biostatistics, University of Michigan, Ann Arbor, MI, United States
| | - J. Michelle Kahlenberg
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
- Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| |
Collapse
|