1
|
Wang TT, Jiang WR, Xu L, Zhou MY, Huang YS. Effect of blockage of Trem1 on the M1 polarization of macrophages in the regulation dental pulp inflammation. Eur J Oral Sci 2024; 132:e13018. [PMID: 39267299 DOI: 10.1111/eos.13018] [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: 03/05/2024] [Accepted: 08/22/2024] [Indexed: 09/17/2024]
Abstract
Dental pulp inflammation is a common and significant factor related to poor dental prognosis. Current treatment strategies primarily concentrate on managing the inflammatory response, with specific targets for intervention still under investigation. Triggering receptors expressed on myeloid cells (TREMs) are a group of receptor molecules extensively present on myeloid cell surfaces, crucial in the regulation of inflammatory process. Our analysis of transcriptomic sequencing data from clinical pulp samples of dataset GSE77459 and animal models revealed up-regulation of Trem1 during pulpitis. Administration of the Trem1-blocking peptide LP17 led to lower (more than 1-fold) levels of several pro-inflammatory factors and inhibition of M1 macrophage polarization both in vivo and in vitro. This study of the expression patterns and functions of Trem1 in the development of dental pulp inflammation provides novel insights into the therapeutic strategies for clinical pulpitis.
Collapse
Affiliation(s)
- Ting-Ting Wang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Wen-Rui Jiang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Li Xu
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Mei-Yun Zhou
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yong-Song Huang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| |
Collapse
|
2
|
Xu Y, Hillman H, Chang M, Ivanov S, Williams JW. Identification of conserved and tissue-restricted transcriptional profiles for lipid associated macrophages (LAMs). BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.09.24.614807. [PMID: 39386558 PMCID: PMC11463620 DOI: 10.1101/2024.09.24.614807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/12/2024]
Abstract
Macrophages are essential immune cells present in all tissues, and are vital for maintaining tissue homeostasis, immune surveillance, and immune responses. Considerable efforts have identified shared and tissue-specific gene programs for macrophages across organs during homeostasis. This information has dramatically enhanced our understanding of tissue-restricted macrophage programming and function. However, few studies have addressed the overlapping and tissue-specific responses of macrophage subsets following inflammatory responses. One subset of macrophages that has been observed across several studies, lipid-associated macrophages (LAMs), have gained interest due to their unique role in lipid metabolism and potential as a therapeutic target. LAMs have been associated with regulating disease outcomes in metabolically related disorders including atherosclerosis, obesity, and nonalcoholic fatty liver disease (NAFLD). In this study, we utilized single-cell RNA sequencing (scRNAseq) data to profile LAMs across multiple tissues and sterile inflammatory conditions in mice and humans. Integration of data from various disease models revealed that LAMs share a set of conserved transcriptional profiles, including Trem2 and Lpl, but also identified key sets of tissue-specific LAM gene programs. Importantly, the shared LAM markers were highly conserved with human LAM populations that also emerge in chronic inflammatory settings. Overall, this analysis provides a detailed transcriptional landscape of tissue-restricted and shared LAM gene programs and offers insights into their roles in metabolic and chronic inflammatory diseases. These data may help instruct appropriate targets for broad or tissue-restricted therapeutic interventions to modulate LAM populations in disease.
Collapse
Affiliation(s)
- Yingzheng Xu
- Center for Immunology, University of Minnesota, Minneapolis, MN USA
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN USA
| | - Hannah Hillman
- Center for Immunology, University of Minnesota, Minneapolis, MN USA
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN USA
| | - Michael Chang
- Center for Immunology, University of Minnesota, Minneapolis, MN USA
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN USA
| | | | - Jesse W. Williams
- Center for Immunology, University of Minnesota, Minneapolis, MN USA
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN USA
| |
Collapse
|
3
|
Fredrickson G, Florczak K, Barrow F, Mahmud S, Dietsche K, Wang H, Parthiban P, Hakeem A, Almutlaq R, Adeyi O, Herman A, Bartolomucci A, Staley C, Dong X, Jahansouz C, Williams JW, Mashek DG, Ikramuddin S, Revelo XS. TREM2 macrophages mediate the beneficial effects of bariatric surgery against MASH. Hepatology 2024:01515467-990000000-01031. [PMID: 39292863 DOI: 10.1097/hep.0000000000001098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 09/03/2024] [Indexed: 09/20/2024]
Abstract
BACKGROUND AND AIMS For patients with obesity and metabolic syndrome, bariatric procedures such as vertical sleeve gastrectomy (VSG) have a clear benefit in ameliorating metabolic dysfunction-associated steatohepatitis (MASH). While the effects of bariatric surgeries have been mainly attributed to nutrient restriction and malabsorption, whether immuno-modulatory mechanisms are involved remains unclear. APPROACH AND RESULT Using murine models, we report that VSG ameliorates MASH progression in a weight loss-independent manner. Single-cell RNA sequencing revealed that hepatic lipid-associated macrophages (LAMs) expressing the triggering receptor expressed on myeloid cells 2 (TREM2) repress inflammation and increase their lysosomal activity in response to VSG. Remarkably, TREM2 deficiency in mice ablates the reparative effects of VSG, suggesting that TREM2 is required for MASH resolution. Mechanistically, TREM2 prevents the inflammatory activation of macrophages and is required for their efferocytic function. CONCLUSIONS Overall, our findings indicate that bariatric surgery improves MASH through a reparative process driven by TREM2+ macrophages, providing insights into the mechanisms of disease reversal that may result in new therapies and improved surgical interventions.
Collapse
Affiliation(s)
- Gavin Fredrickson
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Kira Florczak
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Fanta Barrow
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Shamsed Mahmud
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, Minnesota, USA
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, Minnesota, USA
| | - Katrina Dietsche
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Haiguang Wang
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Preethy Parthiban
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Andrew Hakeem
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Rawan Almutlaq
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Oyedele Adeyi
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Adam Herman
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Alessandro Bartolomucci
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Christopher Staley
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Xiao Dong
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, Minnesota, USA
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, Minnesota, USA
| | - Cyrus Jahansouz
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Jesse W Williams
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
- Center for Immunology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Douglas G Mashek
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, Minnesota, USA
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA
- Department of Medicine, Division of Diabetes, Endocrinology, and Metabolism, University of Minnesota, Minneapolis, Minnesota, USA
| | - Sayeed Ikramuddin
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Xavier S Revelo
- Department of Integrative Biology & Physiology, University of Minnesota, Minneapolis, Minnesota, USA
- Institute on the Biology of Aging and Metabolism, University of Minnesota, Minneapolis, Minnesota, USA
- Center for Immunology, University of Minnesota, Minneapolis, Minnesota, USA
| |
Collapse
|
4
|
Malhi NK, Luo Y, Tang X, Chadha RS, Tapia A, Liu X, Chen M, Yuan D, Qi M, Wei L, Cooke JP, Natarajan R, Southerland KW, Chen ZB. Mapping Endothelial-Macrophage Interactions in Diabetic Vasculature: Role of TREM2 in Vascular Inflammation and Ischemic Response. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.14.594235. [PMID: 38798611 PMCID: PMC11118321 DOI: 10.1101/2024.05.14.594235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Vasculopathies occur 15 years earlier in individuals with diabetes mellitus (DM) as compared to those without, but the underlying mechanisms driving diabetic vasculopathy remain incompletely understood. Endothelial cells (ECs) and macrophages (MΦ) are critical players in vascular wall and their crosstalk is crucial in diabetic vasculopathy. In diabetes, EC activation enables monocyte recruitment, which transmigrate into the intima and differentiate into macrophages (MΦ). Beyond this established model of diapedesis, EC-MΦ interplay is highly intricate and heterogenous. To capture these highly context dependent EC-MΦ interactions, we leveraged single-cell (sc)RNA-seq in conjunction with spatial transcriptome (ST)-seq profiling to analyze human mesenteric arteries from non-diabetic (ND) and type 2 diabetic (T2D) donors. We provide in this study a transcriptomic map encompassing major arterial vascular cells, e.g., EC, mononuclear phagocyte (MP), and T cells, and their interactions associated with human T2D. Furthermore, we identified Triggering Receptor Expressed on Myeloid Cells 2 ( TREM2) as a top T2D-induced gene in MP, with concomitant increase of TREM2 ligands in ECs. TREM2 induction was confirmed in mouse models of T2D and monocyte/MΦ subjected to DM-mimicking stimuli. Perturbing TREM2 with either an antibody or silencing RNA in MPs led to decreased pro-inflammatory responses in MPs and ECs and increased EC migration in vitro . In a mouse model of diabetes, TREM2 expression and its interaction with ECs are increased in the ischemic, as compared to non-ischemic muscles. Importantly, neutralization of TREM2 using a neutralizing antibody enhanced ischemic recovery and flow reperfusion in the diabetic mice, suggesting a role of TREM2 in promoting diabetic PAD. Finally, we verified that both TREM2 expression and the TREM2-EC-interaction are increased in human patients with DM-PAD. Collectively, our study presents the first atlas of human diabetic vessels with a focus on EC-MP interactions. Exemplified by TREM2, our study provides valuable insights into EC-MΦ interactions, key processes contributing to diabetic vasculopathies and the potential of targeting these interactions for therapeutic development.
Collapse
|