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Fang S, Wu S, Chen P. Alpha-2-Macroglobulin Mitigates Glucocorticoid-Induced Osteonecrosis via Keap1/Nrf2 Pathway Activation. Free Radic Biol Med 2024:S0891-5849(24)00695-6. [PMID: 39343183 DOI: 10.1016/j.freeradbiomed.2024.09.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 08/20/2024] [Accepted: 09/27/2024] [Indexed: 10/01/2024]
Abstract
Glucocorticoids (GCs) are widely prescribed for various medical conditions, but prolonged use can result in osteonecrosis of the femoral head (ONFH), a serious condition characterized by bone tissue death due to reduced blood flow. Alpha-2-macroglobulin (A2M) is known to regulate oxidative stress and has been implicated in numerous biological processes. However, its role in GCs-induced ONFH has not been fully elucidated. This study investigates the involvement of A2M in ONFH by examining its activation of the Keap1/Nrf2 signaling pathway. Transcriptomic and proteomic analyses of patient samples with GCs-induced ONFH revealed a significant downregulation of A2M. A rat model of GCs-induced ONFH was then used to overexpress A2M, with subsequent evaluation through histopathological staining. Single-cell RNA sequencing and proteomic analysis indicated that A2M overexpression promotes the proliferation of anti-inflammatory macrophage clusters. Both in vivo and in vitro experiments demonstrated that A2M overexpression significantly alleviated ONFH symptoms by modulating oxidative stress and apoptosis via the Keap1/Nrf2 pathway. These findings underscore the critical role of A2M in mitigating GCs-induced ONFH, providing new therapeutic strategies and targets for future research.
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Affiliation(s)
- Shanhong Fang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, 350005, PR China; Department of Sports Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, PR China; Fujian Orthopaedics Research Institute, Fuzhou, 350000, PR China; Fujian Orthopedic Bone and Joint Disease and Sports Rehabilitation Clinical Medical Research Center, Fuzhou, 350000, PR China
| | - Songye Wu
- Department of Orthopedic Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, 350005, PR China; Department of Sports Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, PR China; Fujian Orthopaedics Research Institute, Fuzhou, 350000, PR China; Fujian Orthopedic Bone and Joint Disease and Sports Rehabilitation Clinical Medical Research Center, Fuzhou, 350000, PR China
| | - Peng Chen
- Department of Orthopedic Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, 350005, PR China; Department of Sports Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, PR China; Fujian Orthopaedics Research Institute, Fuzhou, 350000, PR China; Fujian Orthopedic Bone and Joint Disease and Sports Rehabilitation Clinical Medical Research Center, Fuzhou, 350000, PR China.
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Klement L, Jansakun C, Yan B, Staffer S, Tuma-Kellner S, Altamura S, Muckenthaler M, Merle U, Chamulitrat W. Myeloid-specific deletion of group VIA calcium-independent phospholipase A2 induces pro-inflammatory LPS response predominantly in male mice via MIP-1α activation. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167016. [PMID: 38198970 DOI: 10.1016/j.bbadis.2024.167016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 12/15/2023] [Accepted: 12/31/2023] [Indexed: 01/12/2024]
Abstract
Polymorphisms of group VIA calcium-independent phospholipase A2 (PLA2G6) are associated with blood C-reactive protein suggesting its role in inflammation. We showed that myeloid-specific Pla2g6-deficiency in Pla2g6M-/- mice led to exaggerated inflammation and fibrosis in a lean fatty liver model. We here investigated whether these mutants display alteration in immune response after treatment with E. coli lipopolysaccharides (LPS) under acute (a single dose) and persistent (four doses) conditions. Without LPS treatment, male Pla2g6M-/- (but not Flox) mice at 12 months of age exhibited splenomegaly and hepatic necrosis, and ~ 30 % of them exhibited autoimmune hepatitis showing lymphoplasma cells with CD3(+) and CD45R(+) staining. Under acute LPS, male mutants showed an elevation of plasma MIP-1α and immunoglobulinA as well as upregulation of hepatic apoptosis and fibrosis PARP-1, Bax, MCP-1, α-SMA, and collagen I proteins. Their bone-marrow-derived macrophages also showed an elevation of MIP-1α release upon LPS stimulation in vitro. Female mutants under acute LPS showed a moderate increase in plasma KC/CXCL1, MCP-1, and IL10, and they showed no remarkable increase in hepatic fibrosis under acute or persistent LPS. Male mutants under persistent LPS displayed an elevation of aspartate aminotransferase, blood eosinophils, and hepatic apoptosis. Moreover, ~30 % of these mutants exhibited eosinophilic sclerosing portal hepatitis associated with an upregulated protein expression of hepatic CD8α, CD68, eosinophilic cationic protein, and Ly6G. Thus, myeloid-PLA2G6 deficiency led to an autoimmune and LPS-induced inflammatory liver disease via MIP-1α in a male-predominant manner. Our results may be applicable to patients with PLA2G6 mutations who undergo bacterial infection and sepsis.
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Affiliation(s)
- Lukas Klement
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
| | - Chutima Jansakun
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat 80161, Thailand
| | - Bin Yan
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
| | - Simone Staffer
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
| | - Sabine Tuma-Kellner
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
| | - Sandro Altamura
- Department of Pediatric Oncology, Hematology and Immunology, University Hospital Heidelberg, Im Neuenheimer Feld 350, 69120 Heidelberg, Germany
| | - Martina Muckenthaler
- Department of Pediatric Oncology, Hematology and Immunology, University Hospital Heidelberg, Im Neuenheimer Feld 350, 69120 Heidelberg, Germany; Translational Lung Research Center Heidelberg (TLRC), German Center for Lung Research (DZL), German Centre for Cardiovascular Research, Partner Site, University of Heidelberg, Germany
| | - Uta Merle
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
| | - Walee Chamulitrat
- Internal Medicine IV, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany.
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Andrade A, Poth T, Brobeil A, Merle U, Chamulitrat W. iPLA2β-Null Mice Show HCC Protection by an Induction of Cell-Cycle Arrest after Diethylnitrosamine Treatment. Int J Mol Sci 2022; 23:ijms232213760. [PMID: 36430237 PMCID: PMC9697657 DOI: 10.3390/ijms232213760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/04/2022] [Accepted: 11/08/2022] [Indexed: 11/11/2022] Open
Abstract
Group VIA phospholipase A2 (iPLA2β) play diverse biological functions in epithelial cells and macrophages. Global deletion in iPLA2β-null (KO) mice leads to protection against hepatic steatosis in non-alcoholic fatty liver disease, in part, due to the replenishment of the loss of hepatocellular phospholipids. As the loss of phospholipids also occurs in hepatocellular carcinoma (HCC), we hypothesized that global deletion in KO mice may lead to protection against HCC. Here, HCC induced by diethylnitrosamine (DEN) was chosen because DEN causes direct injury to the hepatocytes. Male wild-type (WT) and KO mice at 3-5 weeks of age (12-13 mice/group) were subjected to a single intraperitoneal treatment with 10 mg/kg DEN, and mice were killed 12 months later. Analyses of histology, plasma cytokines, and gene expression were performed. Due to the low-dose DEN used, we observed a liver nodule in 3 of 13 WT and 2 of 12 KO mice. Only one DEN-treated WT mouse was confirmed to have HCC. DEN-treated KO mice did not show any HCC but showed suppressed hepatic expression of cell-cycle cyclinD2 and BCL2 as well as inflammatory markers IL-1β, IL-10, and VCAM-1. Notably, DEN-treated KO mice showed increased hepatic necrosis and elevated levels of plasma lactate dehydrogenase suggesting an exacerbation of liver injury. Thus, global iPLA2β deficiency in DEN-treated mice rendered HCC protection by an induction of cell-cycle arrest. Our results suggest the role of iPLA2β inhibition in HCC treatment.
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Affiliation(s)
- Adriana Andrade
- Department of Internal Medicine IV (Gastroenterology and Infectious Disease), University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Tanja Poth
- Center for Model System and Comparative Pathology, University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Alexander Brobeil
- Tissuebank of the NCT, Institute of Pathology, University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Uta Merle
- Department of Internal Medicine IV (Gastroenterology and Infectious Disease), University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Walee Chamulitrat
- Department of Internal Medicine IV (Gastroenterology and Infectious Disease), University Hospital Heidelberg, 69120 Heidelberg, Germany
- Correspondence:
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