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Zhang Y, Zhu Z, Cao Y, Xiong Z, Duan Y, Lin J, Zhang X, Jiang M, Liu Y, Man W, Jia T, Feng J, Chen Y, Li C, Guo B, Sun D. Rnd3 suppresses endothelial cell pyroptosis in atherosclerosis through regulation of ubiquitination of TRAF6. Clin Transl Med 2023; 13:e1406. [PMID: 37743632 PMCID: PMC10518494 DOI: 10.1002/ctm2.1406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/24/2023] [Accepted: 08/29/2023] [Indexed: 09/26/2023] Open
Abstract
BACKGROUND As the main pathological basis for various cardiovascular and cerebrovascular diseases, atherosclerosis has become one of the leading causes of death and disability worldwide. Emerging evidence has suggested that Rho GTPase Rnd3 plays an indisputable role in cardiovascular diseases, although its function in atherosclerosis remains unclear. Here, we found a significant correlation between Rnd3 and pyroptosis of aortic endothelial cells (ECs). METHODS ApoeKO mice were utilized as a model for atherosclerosis. Endothelium-specific transgenic mice were employed to disrupt the expression level of Rnd3 in vivo. Mechanistic investigation of the impact of Rnd3 on endothelial cell pyroptosis was carried out using liquid chromatography tandem mass spectrometry (LC-MS/MS), co-immunoprecipitation (Co-IP) assays, and molecular docking. RESULTS Evidence from gain-of-function and loss-of-function studies denoted a protective role for Rnd3 against ECs pyroptosis. Downregulation of Rnd3 sensitized ECs to pyroptosis under oxidized low density lipoprotein (oxLDL) challenge and exacerbated atherosclerosis, while overexpression of Rnd3 effectively prevented these effects. LC-MS/MS, Co-IP assay, and molecular docking revealed that Rnd3 negatively regulated pyroptosis signaling by direct interaction with the ring finger domain of tumor necrosis factor receptor-associated factor 6 (TRAF6). This leads to the suppression of K63-linked TRAF6 ubiquitination and the promotion of K48-linked TRAF6 ubiquitination, inhibiting the activation of NF-κB and promoting the degradation of TRAF6. Moreover, TRAF6 knockdown countered Rnd3 knockout-evoked exacerbation of EC pyroptosis in vivo and vitro. CONCLUSIONS These findings establish a critical functional connection between Rnd3 and the TRAF6/NF-κB/NLRP3 signaling pathway in ECs, indicating the essential role of Rnd3 in preventing pyroptosis of ECs.
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Affiliation(s)
- Yan Zhang
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Zhengru Zhu
- Department of OtolaryngologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Yang Cao
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Zhenyu Xiong
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Yu Duan
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Jie Lin
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Xuebin Zhang
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Mengyuan Jiang
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Yue Liu
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Wanrong Man
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Tengfei Jia
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Jiaxu Feng
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Yanyan Chen
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Congye Li
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Baolin Guo
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
| | - Dongdong Sun
- Department of CardiologyXijing Hospital, Fourth Military Medical UniversityXi'anChina
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Amantea D, La Russa D, Frisina M, Giordano F, Di Santo C, Panno ML, Pignataro G, Bagetta G. Ischemic Preconditioning Modulates the Peripheral Innate Immune System to Promote Anti-Inflammatory and Protective Responses in Mice Subjected to Focal Cerebral Ischemia. Front Immunol 2022; 13:825834. [PMID: 35359933 PMCID: PMC8962743 DOI: 10.3389/fimmu.2022.825834] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/21/2022] [Indexed: 11/26/2022] Open
Abstract
The development of tolerance triggered by a sublethal ischemic episode (preconditioning, PC) involves a complex crosstalk between neurons, astrocytes and microglia, although the role of the peripheral immune system in this context is largely unexplored. Here, we report that severe cerebral ischemia caused by transient middle cerebral artery occlusion (MCAo) in adult male mice elevates blood counts of inflammatory neutrophils and monocytes, and plasma levels of miRNA-329-5p. These inflammatory responses are prevented by ischemic PC induced by 15 min MCAo, 72h before the severe insult (1h MCAo). As compared with sham-operated animals, mice subjected to either ischemic PC, MCAo or a combination of both (PC+MCAo) display spleen contraction. However, protein levels of Ym1 (a marker of polarization of myeloid cells towards M2/N2 protective phenotypes) are elevated only in spleen from the experimental groups PC and PC+MCAo, but not MCAo. Conversely, Ym1 protein levels only increase in circulating leukocytes from mice subjected to 1h MCAo, but not in preconditioned animals, which is coincident with a dramatic elevation of Ym1 expression in the ipsilateral cortex. By immunofluorescence analysis, we observe that expression of Ym1 occurs in amoeboid-shaped myeloid cells, mainly representing inflammatory monocytes/macrophages and neutrophils. As a result of its immune-regulatory functions, ischemic PC prevents elevation of mRNA levels of the pro-inflammatory cytokine interleukin (IL)-1β in the ipsilateral cortex, while not affecting IL-10 mRNA increase induced by MCAo. Overall, the elevated anti-inflammatory/pro-inflammatory ratio observed in the brain of mice pre-exposed to PC is associated with reduced brain infarct volume and ischemic edema, and with amelioration of functional outcome. These findings reaffirm the crucial and dualistic role of the innate immune system in ischemic stroke pathobiology, extending these concepts to the context of ischemic tolerance and underscoring their relevance for the identification of novel therapeutic targets for effective stroke treatment.
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Affiliation(s)
- Diana Amantea
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
| | - Daniele La Russa
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
| | - Marialaura Frisina
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
| | - Francesca Giordano
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
| | - Chiara Di Santo
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
| | - Maria Luisa Panno
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
| | - Giuseppe Pignataro
- Department of Neuroscience, Reproductive and Odontostomatological Sciences, “Federico II” University, Naples, Italy
| | - Giacinto Bagetta
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende (CS), Italy
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3
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Yu F, Ko ML, Ko GYP. MicroRNA-150 and its target ETS-domain transcription factor 1 contribute to inflammation in diabetic photoreceptors. J Cell Mol Med 2021; 25:10724-10735. [PMID: 34704358 PMCID: PMC8581325 DOI: 10.1111/jcmm.17012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/30/2021] [Accepted: 10/04/2021] [Indexed: 12/13/2022] Open
Abstract
Obesity‐associated type 2 diabetes (T2D) is on the rise in the United States due to the obesity epidemic, and 60% of T2D patients develop diabetic retinopathy (DR) in their lifetime. Chronic inflammation is a hallmark of obesity and T2D and a well‐accepted major contributor to DR, and retinal photoreceptors are a major source of intraocular inflammation and directly contribute to vascular abnormalities in diabetes. However, how diabetic insults cause photoreceptor inflammation is not well known. In this study, we used a high‐fat diet (HFD)‐induced T2D mouse model and cultured photoreceptors treated with palmitic acid (PA) to decipher major players that mediate high‐fat‐induced photoreceptor inflammation. We found that PA‐elicited microRNA‐150 (miR‐150) decreases with a consistent upregulation of ETS‐domain transcription factor 1 (Elk1), a downstream target of miR‐150, in PA‐elicited photoreceptor inflammation. We compared wild‐type (WT) and miR‐150 null (miR‐150−/−) mice fed with an HFD and found that deletion of miR‐150 exacerbated HFD‐induced photoreceptor inflammation in conjunction with upregulated ELK1. We further delineated the critical cellular localization of phosphorylated ELK1 at serine 383 (pELK1S383) and found that decreased miR‐150 exacerbated the T2D‐induced inflammation in photoreceptors by upregulating ELK1 and pELK1S383, and knockdown of ELK1 alleviated PA‐elicited photoreceptor inflammation.
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Affiliation(s)
- Fei Yu
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Michael L Ko
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA.,Department of Biology, Division of Natural and Physical Sciences, Blinn College, Bryan, Texas, USA
| | - Gladys Y-P Ko
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA.,Texas A&M Institute for Neuroscience, Texas A&M University, College Station, Texas, USA
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Chilosi M, Poletti V, Ravaglia C, Rossi G, Dubini A, Piciucchi S, Pedica F, Bronte V, Pizzolo G, Martignoni G, Doglioni C. The pathogenic role of epithelial and endothelial cells in early-phase COVID-19 pneumonia: victims and partners in crime. Mod Pathol 2021; 34:1444-1455. [PMID: 33883694 PMCID: PMC8058579 DOI: 10.1038/s41379-021-00808-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/15/2021] [Accepted: 03/17/2021] [Indexed: 02/04/2023]
Abstract
Current understanding of the complex pathogenesis of COVID-19 interstitial pneumonia pathogenesis in the light of biopsies carried out in early/moderate phase and histology data obtained at postmortem analysis is discussed. In autopsies the most observed pattern is diffuse alveolar damage with alveolar-epithelial type-II cell hyperplasia, hyaline membranes, and frequent thromboembolic disease. However, these observations cannot explain some clinical, radiological and physiopathological features observed in SARS-CoV-2 interstitial pneumonia, including the occurrence of vascular enlargement on CT and preserved lung compliance in subjects even presenting with or developing respiratory failure. Histological investigation on early-phase pneumonia on perioperative samples and lung biopsies revealed peculiar morphological and morpho-phenotypical changes including hyper-expression of phosphorylated STAT3 and immune checkpoint molecules (PD-L1 and IDO) in alveolar-epithelial and endothelial cells. These features might explain in part these discrepancies.
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Affiliation(s)
- Marco Chilosi
- Department of Pathology, Pederzoli Hospital, Peschiera del Garda, Italy.
| | - Venerino Poletti
- Department of Respiratory Diseases and Allergy, Aarhus University Hospital, Aarhus, Denmark,Department of Diseases of the Thorax, G.B. Morgagni Hospital, Forlì, Italy
| | - Claudia Ravaglia
- Department of Diseases of the Thorax, G.B. Morgagni Hospital, Forlì, Italy
| | - Giulio Rossi
- Department of Pathology, Ravenna Hospital, Ravenna, Italy
| | | | - Sara Piciucchi
- Department of Radiology, G.B. Morgagni Hospital, Forlì, Italy
| | - Federica Pedica
- Department of Pathology, San Raffaele Scientific Institute, Milan, Italy
| | - Vincenzo Bronte
- Department of Medicine, Section of Immunology, University of Verona, Verona, Italy
| | - Giovanni Pizzolo
- Department of Medicine, Section of Hematology, University of Verona, Verona, Italy
| | - Guido Martignoni
- Department of Pathology, Pederzoli Hospital, Peschiera del Garda, Italy,Department of Pathology and Diagnostics, University of Verona, Verona, Italy
| | - Claudio Doglioni
- Department of Pathology, San Raffaele Scientific Institute, Milan, Italy
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