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Wang L, He X, Hu G, Liu J, Kang X, Yu L, Dong K, Zhao J, Zhang A, Zhang W, Brands MW, Su H, Zheng Z, Zhou J. A novel mouse model carrying a gene trap insertion into the Hmgxb4 gene locus to examine Hmgxb4 expression in vivo. Physiol Rep 2024; 12:e16014. [PMID: 38644513 PMCID: PMC11033291 DOI: 10.14814/phy2.16014] [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: 12/27/2023] [Revised: 03/30/2024] [Accepted: 04/02/2024] [Indexed: 04/23/2024] Open
Abstract
HMG (high mobility group) proteins are a diverse family of nonhistone chromosomal proteins that interact with DNA and a wide range of transcriptional regulators to regulate the structural architecture of DNA. HMGXB4 (also known as HMG2L1) is an HMG protein family member that contains a single HMG box domain. Our previous studies have demonstrated that HMGXB4 suppresses smooth muscle differentiation and exacerbates endotoxemia by promoting a systemic inflammatory response in mice. However, the expression of Hmgxb4 in vivo has not fully examined. Herein, we generated a mouse model that harbors a gene trap in the form of a lacZ gene insertion into the Hmgxb4 gene. This mouse enables the visualization of endogenous HMGXB4 expression in different tissues via staining for the β-galactosidase activity of LacZ which is under the control of the endogenous Hmgxb4 gene promoter. We found that HMGXB4 is widely expressed in mouse tissues and is a nuclear protein. Furthermore, the Hmgxb4 gene trap mice exhibit normal cardiac function and blood pressure. Measurement of β-galactosidase activity in the Hmgxb4 gene trap mice demonstrated that the arterial injury significantly induces Hmgxb4 expression. In summary, the Hmgxb4 gene trap reporter mouse described here provides a valuable tool to examine the expression level of endogenous Hmgxb4 in both physiological and pathological settings in vivo.
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Affiliation(s)
- Liang Wang
- Department of CardiologyThe First Affiliated Hospital of Nanchang UniversityNanchangChina
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
| | - Xiangqin He
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
| | - Guoqing Hu
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
| | - Jinhua Liu
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
- Department of Respiratory MedicineThe First Affiliated Hospital of Nanchang UniversityNanchangChina
| | - Xiuhua Kang
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
- Department of Respiratory MedicineThe First Affiliated Hospital of Nanchang UniversityNanchangChina
| | - Luyi Yu
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
- Department of Respiratory MedicineThe First Affiliated Hospital of Nanchang UniversityNanchangChina
| | - Kunzhe Dong
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
| | - Juanjuan Zhao
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
| | - Aizhen Zhang
- Vascular Biology Center, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
- Training CenterGuangxi Medical CollegeNanningChina
| | - Wei Zhang
- Department of Respiratory MedicineThe First Affiliated Hospital of Nanchang UniversityNanchangChina
| | | | - Huabo Su
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
- Vascular Biology Center, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
| | - Zeqi Zheng
- Department of CardiologyThe First Affiliated Hospital of Nanchang UniversityNanchangChina
| | - Jiliang Zhou
- Department of Pharmacology & Toxicology, Medical College of GeorgiaAugusta UniversityAugustaGeorgiaUSA
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Devaraj A, Singh M, Narayanavari SA, Yong G, Chen J, Wang J, Becker M, Walisko O, Schorn A, Cseresznyés Z, Raskó T, Radscheit K, Selbach M, Ivics Z, Izsvák Z. HMGXB4 Targets Sleeping Beauty Transposition to Germinal Stem Cells. Int J Mol Sci 2023; 24:ijms24087283. [PMID: 37108449 PMCID: PMC10138897 DOI: 10.3390/ijms24087283] [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: 12/02/2022] [Revised: 03/20/2023] [Accepted: 03/23/2023] [Indexed: 04/29/2023] Open
Abstract
Transposons are parasitic genetic elements that frequently hijack vital cellular processes of their host. HMGXB4 is a known Wnt signaling-regulating HMG-box protein, previously identified as a host-encoded factor of Sleeping Beauty (SB) transposition. Here, we show that HMGXB4 is predominantly maternally expressed, and marks both germinal progenitor and somatic stem cells. SB piggybacks HMGXB4 to activate transposase expression and target transposition to germinal stem cells, thereby potentiating heritable transposon insertions. The HMGXB4 promoter is located within an active chromatin domain, offering multiple looping possibilities with neighboring genomic regions. HMGXB4 is activated by ERK2/MAPK1, ELK1 transcription factors, coordinating pluripotency and self-renewal pathways, but suppressed by the KRAB-ZNF/TRIM28 epigenetic repression machinery, also known to regulate transposable elements. At the post-translational level, SUMOylation regulates HMGXB4, which modulates binding affinity to its protein interaction partners and controls its transcriptional activator function via nucleolar compartmentalization. When expressed, HMGXB4 can participate in nuclear-remodeling protein complexes and transactivate target gene expression in vertebrates. Our study highlights HMGXB4 as an evolutionarily conserved host-encoded factor that assists Tc1/Mariner transposons to target the germline, which was necessary for their fixation and may explain their abundance in vertebrate genomes.
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Affiliation(s)
- Anantharam Devaraj
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Manvendra Singh
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Suneel A Narayanavari
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Guo Yong
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Jiaxuan Chen
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Jichang Wang
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Mareike Becker
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Oliver Walisko
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institute, Paul-Ehrlich-Strasse 51-59, 63225 Langen, Germany
| | - Andrea Schorn
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Zoltán Cseresznyés
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Tamás Raskó
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Kathrin Radscheit
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Matthias Selbach
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Zoltán Ivics
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institute, Paul-Ehrlich-Strasse 51-59, 63225 Langen, Germany
| | - Zsuzsanna Izsvák
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Society (MDC), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
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Zhao S, Sun Y, Wu X, Yang Y, Fan K, Hu K, Qin Y, Li K, Lin L, Chen K, Ma Y, Zhu M, Liu G, Zhang L. Sirtuin 1 activator alleviated lethal inflammatory injury via promotion of autophagic degradation of pyruvate kinase M2. Front Pharmacol 2023; 14:1092943. [PMID: 37101542 PMCID: PMC10123272 DOI: 10.3389/fphar.2023.1092943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 03/28/2023] [Indexed: 04/28/2023] Open
Abstract
Upregulation of pyruvate kinase M2 (PKM2) is critical for the orchestration of metabolism and inflammation in critical illness, while autophagic degradation is a recently revealed mechanism that counter-regulates PKM2. Accumulating evidence suggests that sirtuin 1 (SIRT1) function as a crucial regulator in autophagy. The present study investigated whether SIRT1 activator would downregulate PKM2 in lethal endotoxemia via promotion of its autophagic degradation. The results indicated that lethal dose of lipopolysaccharide (LPS) exposure decreased the level of SIRT1. Treatment with SRT2104, a SIRT1 activator, reversed LPS-induced downregulation of LC3B-II and upregulation of p62, which was associated with reduced level of PKM2. Activation of autophagy by rapamycin also resulted in reduction of PKM2. The decline of PKM2 in SRT2104-treated mice was accompanied with compromised inflammatory response, alleviated lung injury, suppressed elevation of blood urea nitrogen (BUN) and brain natriuretic peptide (BNP), and improved survival of the experimental animals. In addition, co-administration of 3-methyladenine, an autophagy inhibitor, or Bafilomycin A1, a lysosome inhibitor, abolished the suppressive effects of SRT2104 on PKM2 abundance, inflammatory response and multiple organ injury. Therefore, promotion of autophagic degradation of PKM2 might be a novel mechanism underlying the anti-inflammatory benefits of SIRT1 activator.
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Affiliation(s)
- Shuang Zhao
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
- Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Yili Sun
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Xicheng Wu
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Yongqiang Yang
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Kerui Fan
- Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Kai Hu
- Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Yasha Qin
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Kexin Li
- Medical Sciences Research Center, University-Town Hospital of Chongqing Medical University, Chongqing, China
| | - Ling Lin
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Kun Chen
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Yuhua Ma
- Xinjiang Key Laboratory of Clinical Genetic Testing and Biomedical Information, Karamay, China
| | - Min Zhu
- Xinjiang Key Laboratory of Clinical Genetic Testing and Biomedical Information, Karamay, China
| | - Gang Liu
- Medical Sciences Research Center, University-Town Hospital of Chongqing Medical University, Chongqing, China
- Department of Emergency and Critical Care Medicine, University-Town Hospital of Chongqing Medical University, Chongqing, China
- *Correspondence: Gang Liu, ; Li Zhang,
| | - Li Zhang
- Department of Pathophysiology, Basic Medical College, Chongqing Medical University, Chongqing, China
- *Correspondence: Gang Liu, ; Li Zhang,
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Ma J, You D, Chen S, Fang N, Yi X, Wang Y, Lu X, Li X, Zhu M, Xue M, Tang Y, Wei X, Huang J, Zhu Y. Epigenetic association study uncovered H3K27 acetylation enhancers and dysregulated genes in high-fat-diet-induced nonalcoholic fatty liver disease in rats. Epigenomics 2022; 14:1523-1540. [PMID: 36851897 DOI: 10.2217/epi-2022-0362] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
Aim: To evaluate the regulatory landscape underlying the active enhancer marked by H3K27ac in high-fat diet (HFD)-induced nonalcoholic fatty liver disease (NAFLD) in rats. Materials & methods: H3K27ac chromatin immunoprecipitation and high-throughput RNA sequencing to construct regulatory profiles and transcriptome of liver from NAFLD rat model induced by HFD. De novo motif analysis for differential H3K27ac peaks. Functional enrichment, Kyoto Encyclopedia of Genes and Genomes pathway and protein-protein interaction network were examined for differential peak-genes. The mechanism was further verified by western blot, chromatin immunoprecipitation-quantitative PCR and real-time PCR. Results: A total of 1831 differential H3K27ac peaks were identified significantly correlating with transcription factors and target genes (CYP8B1, PLA2G12B, SLC27A5, CYP7A1 and APOC3) involved in lipid and energy homeostasis. Conclusion: Altered acetylation induced by HFD leads to the dysregulation of gene expression, further elucidating the epigenetic mechanism in the etiology of NAFLD.
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Affiliation(s)
- Jinhu Ma
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Dandan You
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Shuwen Chen
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Nana Fang
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Xinrui Yi
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Yi Wang
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Xuejin Lu
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Xinyu Li
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Meizi Zhu
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Min Xue
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Yunshu Tang
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Xiaohui Wei
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
| | - Jianzhen Huang
- College of Animal Science & Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Yaling Zhu
- Department of Pathophysiology, Anhui Medical University, Hefei, 230032, China
- Laboratory Animal Research Center, College of Basic Medical Science, Anhui Medical University, Hefei, 230032, China
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TRPC1 Contributes to Endotoxemia-induced Myocardial Dysfunction via Mediating Myocardial Apoptosis and Autophagy. Pharmacol Res 2022; 181:106262. [PMID: 35598715 DOI: 10.1016/j.phrs.2022.106262] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 05/10/2022] [Accepted: 05/13/2022] [Indexed: 12/16/2022]
Abstract
Cardiac dysfunction is a vital complication of endotoxemia (ETM) with limited therapeutic options. Transient receptor potential canonical channel (TRPC)1 was involved in various heart diseases. While, the role of TRPC1 in ETM-induced cardiac dysfunction remains to be defined. In this study, we found that TRPC1 protein expression was significantly upregulated in hearts of lipopolysaccharide (LPS)-challenged mice. What's more, TRPC1 knockdown significantly alleviated LPS-induced cardiac dysfunction and injury. Further myocardial mRNA-sequencing analysis revealed that TRPC1 might participate in pathogenesis of ETM-induced cardiac dysfunction via mediating myocardial apoptosis and autophagy. Data showed that knockdown of TRPC1 significantly ameliorated LPS-induced myocardial apoptotic injury, cardiomyocytes autophagosome accumulation, and myocardial autophagic flux. Simultaneously, deletion of TRPC1 reversed LPS-induced molecular changes of apoptosis/autophagy signaling pathway in cardiomyocytes. Moreover, TRPC1 could promote LPS-triggered intracellular Ca2+ release, subsequent calpain activation and caveolin-1 degradation. Either blocking calpain by PD150606 or enhancing the amount of caveolin-1 scaffolding domain that interacts with TRPC1 by cell-permeable peptide cavtratin significantly alleviated the LPS-induced cardiac dysfunction and cardiomyocytes apoptosis/autophagy. Furthermore, cavtratin could inhibit LPS-induced calpain activation in cardiomyocytes. caveolin-1 could directly interact with calpain 2 both in vivo and in vitro. Importantly, cecal ligation and puncture-stimulated cardiac dysfunction and mortality were significantly alleviated in Trpc1-/- and cavtratin-treated mice, which further validated the contribution of TRPC1-caveolin-1 signaling axis in sepsis-induced pathological process. Overall, this study indicated that TRPC1 could promote LPS-triggered intracellular Ca2+ release, mediate caveolin-1 reduction, and in turn activates calpain to regulate myocardial apoptosis and autophagy, contributing to ETM-induced cardiac dysfunction of mice.
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Gokula V, Terrero D, Joe B. Six Decades of History of Hypertension Research at the University of Toledo: Highlighting Pioneering Contributions in Biochemistry, Genetics, and Host-Microbiota Interactions. Curr Hypertens Rep 2022; 24:669-685. [PMID: 36301488 PMCID: PMC9708772 DOI: 10.1007/s11906-022-01226-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2022] [Indexed: 01/31/2023]
Abstract
PURPOSE OF REVIEW The study aims to capture the history and lineage of hypertension researchers from the University of Toledo in Ohio and showcase their collective scientific contributions dating from their initial discoveries of the physiology of adrenal and renal systems and genetics regulating blood pressure (BP) to its more contemporary contributions including microbiota and metabolomic links to BP regulation. RECENT FINDINGS The University of Toledo College of Medicine and Life Sciences (UTCOMLS), previously known as the Medical College of Ohio, has contributed significantly to our understanding of the etiology of hypertension. Two of the scientists, Patrick Mulrow and John Rapp from UTCOMLS, have been recognized with the highest honor, the Excellence in Hypertension award from the American Heart Association for their pioneering work on the physiology and genetics of hypertension, respectively. More recently, Bina Joe has continued their legacy in the basic sciences by uncovering previously unknown novel links between microbiota and metabolites to the etiology of hypertension, work that has been recognized by the American Heart Association with multiple awards. On the clinical research front, Christopher Cooper and colleagues lead the CORAL trials and contributed importantly to the investigations on renal artery stenosis treatment paradigms. Hypertension research at this institution has not only provided these pioneering insights, but also grown careers of scientists as leaders in academia as University Presidents and Deans of Medical Schools. Through the last decade, the university has expanded its commitment to Hypertension research as evident through the development of the Center for Hypertension and Precision Medicine led by Bina Joe as its founding Director. Hypertension being the top risk factor for cardiovascular diseases, which is the leading cause of human mortality, is an important area of research in multiple international universities. The UTCOMLS is one such university which, for the last 6 decades, has made significant contributions to our current understanding of hypertension. This review is a synthesis of this rich history. Additionally, it also serves as a collection of audio archives by more recent faculty who are also prominent leaders in the field of hypertension research, including John Rapp, Bina Joe, and Christopher Cooper, which are cataloged at Interviews .
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Affiliation(s)
- Veda Gokula
- grid.267337.40000 0001 2184 944XCenter for Hypertension and Precision Medicine, Department of Physiology and Pharmacology, College of Medicine and Life Sciences, University of Toledo College of Medicine and Life Sciences, Block Health Science Building, 3000 Arlington Ave, Toledo, OH 43614-2598 USA
| | - David Terrero
- grid.267337.40000 0001 2184 944XDepartment of Pharmacology and Experimental Therapeutics, College of Pharmacy, University of Toledo, Toledo, OH USA
| | - Bina Joe
- grid.267337.40000 0001 2184 944XCenter for Hypertension and Precision Medicine, Department of Physiology and Pharmacology, College of Medicine and Life Sciences, University of Toledo College of Medicine and Life Sciences, Block Health Science Building, 3000 Arlington Ave, Toledo, OH 43614-2598 USA
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Cheng TL, Lin YS, Hong YK, Ma CY, Tsai HW, Shi GY, Wu HL, Lai CH. Role of tumor endothelial marker 1 (Endosialin/CD248) lectin-like domain in lipopolysaccharide-induced macrophage activation and sepsis in mice. Transl Res 2021; 232:150-162. [PMID: 33737161 DOI: 10.1016/j.trsl.2021.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 11/16/2022]
Abstract
Deleterious hyper-inflammation resulting from macrophage activation may aggravate sepsis and lead to lethality. Tumor endothelial marker 1 (TEM1), a type I transmembrane glycoprotein containing six functional domains, has been implicated in cancer and chronic sterile inflammatory disorders. However, the role of TEM1 in acute sepsis remains to be determined. Herein we explored the functional significance of the TEM1 lectin-like domain (TEM1D1) in monocyte/macrophage activation and sepsis using TEM1D1-deleted (TEM1LeD/LeD) transgenic mice and recombinant TEM1D1 (rTEM1D1) protein. Under stimulation with lipopolysaccharides (LPS) or several other toll-like receptor agonists, TEM1LeD/LeD macrophages produced lower levels of tumor necrosis factor (TNF)-α and interleukin (IL)-6 than wild-type TEM1wt/wt macrophages. Compared with TEM1wt/wt macrophages, LPS-macrophage binding and intracellular mitogen-activated protein kinase (MAPK)/nuclear factor (NF)-κB activation were suppressed in TEM1LeD/LeD macrophages. In vivo, TEM1D1 deletion improved survival in LPS-challenged mice with reduction of circulating TNF-α and IL-6 and alleviation of lung injury and pulmonary leukocyte accumulation. In contrast, rTEM1D1 could bind to LPS and markedly suppress LPS-macrophage binding, MAPK/NF-κB signaling in macrophages and proinflammatory cytokine production. Treatment with rTEM1D1 improved survival and attenuated circulating TNF-α and IL-6, lung injury and pulmonary accumulation of leukocytes in LPS-challenged mice. These findings demonstrated differential roles for the TEM1 lectin-like domain in macrophages and soluble TEM1 lectin-like domain in sepsis. TEM1 in macrophages mediates LPS-induced inflammation via its lectin-like domain, whereas rTEM1D1 interferes with LPS-induced macrophage activation and sepsis.
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Affiliation(s)
- Tsung-Lin Cheng
- Department of Physiology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Orthopedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan; Regenerative Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yu-Syuan Lin
- Department of Biochemistry and Molecular Biology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yi-Kai Hong
- Department of Dermatology, National Cheng Kung University hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; International Center for Wound Repair and Regeneration, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chih-Yuan Ma
- Department of Biochemistry and Molecular Biology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Hung-Wen Tsai
- Department of Pathology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Guey-Yueh Shi
- Department of Biochemistry and Molecular Biology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Hua-Lin Wu
- Department of Biochemistry and Molecular Biology, College of Medicine, National Cheng Kung University, Tainan, Taiwan; International Center for Wound Repair and Regeneration, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chao-Han Lai
- Department of Biochemistry and Molecular Biology, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Surgery, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee.
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