1
|
Htwe YM, Wang H, Belvitch P, Meliton L, Bandela M, Letsiou E, Dudek SM. Group V Phospholipase A 2 Mediates Endothelial Dysfunction and Acute Lung Injury Caused by Methicillin-Resistant Staphylococcus Aureus. Cells 2021; 10:1731. [PMID: 34359901 PMCID: PMC8304832 DOI: 10.3390/cells10071731] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/25/2021] [Accepted: 07/03/2021] [Indexed: 12/12/2022] Open
Abstract
Lung endothelial dysfunction is a key feature of acute lung injury (ALI) and clinical acute respiratory distress syndrome (ARDS). Previous studies have identified the lipid-generating enzyme, group V phospholipase A2 (gVPLA2), as a mediator of lung endothelial barrier disruption and inflammation. The current study aimed to determine the role of gVPLA2 in mediating lung endothelial responses to methicillin-resistant Staphylococcus aureus (MRSA, USA300 strain), a major cause of ALI/ARDS. In vitro studies assessed the effects of gVPLA2 inhibition on lung endothelial cell (EC) permeability after exposure to heat-killed (HK) MRSA. In vivo studies assessed the effects of intratracheal live or HK-MRSA on multiple indices of ALI in wild-type (WT) and gVPLA2-deficient (KO) mice. In vitro, HK-MRSA increased gVPLA2 expression and permeability in human lung EC. Inhibition of gVPLA2 with either the PLA2 inhibitor, LY311727, or with a specific monoclonal antibody, attenuated the barrier disruption caused by HK-MRSA. LY311727 also reduced HK-MRSA-induced permeability in mouse lung EC isolated from WT but not gVPLA2-KO mice. In vivo, live MRSA caused significantly less ALI in gVPLA2 KO mice compared to WT, findings confirmed by intravital microscopy assessment in HK-MRSA-treated mice. After targeted delivery of gVPLA2 plasmid to lung endothelium using ACE antibody-conjugated liposomes, MRSA-induced ALI was significantly increased in gVPLA2-KO mice, indicating that lung endothelial expression of gVPLA2 is critical in vivo. In summary, these results demonstrate an important role for gVPLA2 in mediating MRSA-induced lung EC permeability and ALI. Thus, gVPLA2 may represent a novel therapeutic target in ALI/ARDS caused by bacterial infection.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Steven M. Dudek
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine, University of Illinois at Chicago, Chicago, IL 60612, USA; (Y.M.H.); (H.W.); (P.B.); (L.M.); (M.B.); (E.L.)
| |
Collapse
|
2
|
Wu C, Su J, Wang X, Wang J, Xiao K, Li Y, Xiao Q, Ling M, Xiao Y, Qin C, Long W, Zhang F, Pan Y, Xiang F, Liu Q. Overexpression of the phospholipase A2 group V gene in glioma tumors is associated with poor patient prognosis. Cancer Manag Res 2019; 11:3139-3152. [PMID: 31114356 PMCID: PMC6489671 DOI: 10.2147/cmar.s199207] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Accepted: 03/17/2019] [Indexed: 11/23/2022] Open
Abstract
Purpose: Gliomas are the most common primary malignant neoplasms of the central nervous system. Secreted phospholipases A2 (sPLA2s) are known to play an important role in various physiological processes, including bioactive lipid production, defense mechanisms, and cell signaling. However, their roles and clinical importance in gliomas remain unclear. Patients and methods: In this study, we analyzed the association between the expression of various sPLA2-encoding genes and the clinicopathology of gliomas, using the data of 1047 patients obtained from a public database. Immunohistochemical analysis of 82 glioma tissues was also carried out to assess the relationship between phospholipase A2 group V (PLA2G5) protein expression and the World Health Organization (WHO) glioma grades. Results: We found that high PLA2G5 gene expression was associated with unfavorable prognosis in both low-grade and high-grade gliomas. The immunohistochemistry of the 82 glioma tissues further confirmed that PLA2G5 protein expression was dependent on the WHO glioma grade. In addition, we found a correlation between PLA2G5 gene expression and both epithelial-mesenchymal transition and the isocitrate dehydrogenase 1 mutation status in these tumors. Conclusion: Our results indicate that PLA2G5 could be a potential biomarker for predicting poor prognosis in patients with gliomas.
Collapse
Affiliation(s)
- Changwu Wu
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Jun Su
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Xiangyu Wang
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Junquan Wang
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Kai Xiao
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Yang Li
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Qun Xiao
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Min Ling
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Yao Xiao
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Chaoying Qin
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Wenyong Long
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China.,Institute of Skull Base Surgery and Neuro-Oncology at Hunan Neurosurgery Institute of Central South University, Changsha, Hunan, People's Republic of China
| | - Fengqi Zhang
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Yimin Pan
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Feng Xiang
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China
| | - Qing Liu
- Department of Neurosurgery, Xiangya Hospital, Central-South University, Changsha, Hunan, People's Republic of China.,Institute of Skull Base Surgery and Neuro-Oncology at Hunan Neurosurgery Institute of Central South University, Changsha, Hunan, People's Republic of China
| |
Collapse
|