{"title":"β-hydroxybutyrylation and O-GlcNAc modifications of STAT1 modulate antiviral defense in aging.","authors":"Yibo Zuo, Qin Wang, Wanying Tian, Zhijin Zheng, Wei He, Renxia Zhang, Qian Zhao, Ying Miao, Yukang Yuan, Jun Wang, Hui Zheng","doi":"10.1038/s41423-025-01266-x","DOIUrl":"https://doi.org/10.1038/s41423-025-01266-x","url":null,"abstract":"<p><p>Aging changes the protein activity status to affect the body's functions. However, how aging regulates protein posttranslational modifications (PTMs) to modulate the antiviral defense ability of the body remains unclear. Here, we found that aging promotes STAT1 β-hydroxybutyrylation (Kbhb) at Lys592, which inhibits the interaction between STAT1 and type-I interferon (IFN-I) receptor 2 (IFNAR2), thereby attenuating IFN-I-mediated antiviral defense activity. Additionally, we discovered that a small molecule from a plant source, hydroxy camptothecine, can effectively reduce the level of STAT1 Kbhb, thus increasing antiviral defense ability in vivo. Further studies revealed that STAT1 O-GlcNAc modifications at Thr699 block CBP-induced STAT1 Kbhb. Importantly, fructose can improve IFN-I antiviral defense activity by orchestrating STAT1 O-GlcNAc and Kbhb modifications. This study reveals the significance of the switch between STAT1 Kbhb and O-GlcNAc modifications in regulating IFN-I antiviral immunity during aging and provides potential strategies to improve the body's antiviral defense ability in elderly individuals.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143467066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ismail Ogulur, Yasutaka Mitamura, Duygu Yazici, Yagiz Pat, Sena Ardicli, Manru Li, Paolo D'Avino, Carina Beha, Huseyn Babayev, Bingjie Zhao, Can Zeyneloglu, Oliva Giannelli Viscardi, Ozge Ardicli, Ayca Kiykim, Asuncion Garcia-Sanchez, Juan-Felipe Lopez, Li-Li Shi, Minglin Yang, Stephan R Schneider, Stephen Skolnick, Raja Dhir, Urszula Radzikowska, Abhijeet J Kulkarni, Manal Bel Imam, Willem van de Veen, Milena Sokolowska, Mar Martin-Fontecha, Oscar Palomares, Kari C Nadeau, Mubeccel Akdis, Cezmi A Akdis
{"title":"Type 2 immunity in allergic diseases.","authors":"Ismail Ogulur, Yasutaka Mitamura, Duygu Yazici, Yagiz Pat, Sena Ardicli, Manru Li, Paolo D'Avino, Carina Beha, Huseyn Babayev, Bingjie Zhao, Can Zeyneloglu, Oliva Giannelli Viscardi, Ozge Ardicli, Ayca Kiykim, Asuncion Garcia-Sanchez, Juan-Felipe Lopez, Li-Li Shi, Minglin Yang, Stephan R Schneider, Stephen Skolnick, Raja Dhir, Urszula Radzikowska, Abhijeet J Kulkarni, Manal Bel Imam, Willem van de Veen, Milena Sokolowska, Mar Martin-Fontecha, Oscar Palomares, Kari C Nadeau, Mubeccel Akdis, Cezmi A Akdis","doi":"10.1038/s41423-025-01261-2","DOIUrl":"https://doi.org/10.1038/s41423-025-01261-2","url":null,"abstract":"<p><p>Significant advancements have been made in understanding the cellular and molecular mechanisms of type 2 immunity in allergic diseases such as asthma, allergic rhinitis, chronic rhinosinusitis, eosinophilic esophagitis (EoE), food and drug allergies, and atopic dermatitis (AD). Type 2 immunity has evolved to protect against parasitic diseases and toxins, plays a role in the expulsion of parasites and larvae from inner tissues to the lumen and outside the body, maintains microbe-rich skin and mucosal epithelial barriers and counterbalances the type 1 immune response and its destructive effects. During the development of a type 2 immune response, an innate immune response initiates starting from epithelial cells and innate lymphoid cells (ILCs), including dendritic cells and macrophages, and translates to adaptive T and B-cell immunity, particularly IgE antibody production. Eosinophils, mast cells and basophils have effects on effector functions. Cytokines from ILC2s and CD4+ helper type 2 (Th2) cells, CD8 + T cells, and NK-T cells, along with myeloid cells, including IL-4, IL-5, IL-9, and IL-13, initiate and sustain allergic inflammation via T cell cells, eosinophils, and ILC2s; promote IgE class switching; and open the epithelial barrier. Epithelial cell activation, alarmin release and barrier dysfunction are key in the development of not only allergic diseases but also many other systemic diseases. Recent biologics targeting the pathways and effector functions of IL4/IL13, IL-5, and IgE have shown promising results for almost all ages, although some patients with severe allergic diseases do not respond to these therapies, highlighting the unmet need for a more detailed and personalized approach.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dou Yu, Xintong Gao, Fei Shao, Zhen Liu, Aoyi Liu, Min Zhao, Zhuozhou Tang, Yude Guan, Shuo Wang
{"title":"Antigen-presenting innate lymphoid cells induced by BCG vaccination promote a respiratory antiviral immune response through the skin‒lung axis.","authors":"Dou Yu, Xintong Gao, Fei Shao, Zhen Liu, Aoyi Liu, Min Zhao, Zhuozhou Tang, Yude Guan, Shuo Wang","doi":"10.1038/s41423-025-01267-w","DOIUrl":"https://doi.org/10.1038/s41423-025-01267-w","url":null,"abstract":"<p><p>The route of vaccine administration is associated with various immune outcomes, and the relationship between the route of administration and broad protection against heterologous pathogens remains unclear. Here, we found that subcutaneous vaccination with Bacillus Calmette-Guérin (BCG) promotes respiratory influenza clearance and T-cell responses. Group 1 innate lymphoid cells (ILC1s) express MHCII molecules and engage in antigen processing and presentation after BCG vaccination. During influenza virus infection, ILC1s in the lungs of BCG-vaccinated mice can present influenza virus antigens and prime Th1 cells. After subcutaneous vaccination with BCG, MHCII<sup>+</sup> ILC1s migrate from the skin to the lungs and play an antigen-presenting role in influenza infection. Both the BCG and the BCG component lipomannan can induce MHCII expression and skin-to-lung migration of ILC1s via TLR2 signaling. Our study revealed an important regulatory mechanism by which subcutaneous vaccination with BCG promotes respiratory antiviral immune responses via the skin‒lung axis.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ilaria Signoretto, Federica Calzetti, Giulia Finotti, Silvia Lonardi, Camillo Balanzin, Francisco Bianchetto-Aguilera, Sara Gasperini, Elisa Gardiman, Monica Castellucci, Anna Russignan, Massimiliano Bonifacio, Antonio Sica, William Vermi, Cristina Tecchio, Patrizia Scapini, Nicola Tamassia, Marco A Cassatella
{"title":"Uncovering two neutrophil-committed progenitors that immediately precede promyelocytes during human neutropoiesis.","authors":"Ilaria Signoretto, Federica Calzetti, Giulia Finotti, Silvia Lonardi, Camillo Balanzin, Francisco Bianchetto-Aguilera, Sara Gasperini, Elisa Gardiman, Monica Castellucci, Anna Russignan, Massimiliano Bonifacio, Antonio Sica, William Vermi, Cristina Tecchio, Patrizia Scapini, Nicola Tamassia, Marco A Cassatella","doi":"10.1038/s41423-025-01259-w","DOIUrl":"10.1038/s41423-025-01259-w","url":null,"abstract":"<p><p>Technological advances have greatly improved our knowledge of myelopoiesis, for example, with the discovery of granulocyte‒monocyte‒dendritic cell (DC) progenitors (GMDPs), monocyte‒DC progenitors (MDPs), common DC progenitors (CDPs) and common monocyte progenitors (cMoPs) on the basis of flow cytometry approaches. Concomitantly, some progress has been made in characterizing the very early phases of human neutropoiesis with the description of novel CD66b<sup>+</sup> progenitors, including eNePs, PMs w/o eNePs, ProNeus, and PreNeus. More recently, we identified four SSC<sup>lo</sup>Lin<sup>-</sup>CD66b<sup>-</sup>CD45<sup>dim</sup>CD34<sup>+</sup>/CD34<sup>dim/-</sup>CD64<sup>dim</sup>CD115<sup>-</sup> cells as the earliest precursors specifically committed to the neutrophil lineage present in human bone marrow (BM), which we called neutrophil-committed progenitors (NCPs, from NCP1s to NCP4s). In this study, we report the isolation and characterization of two new SSC<sup>hi</sup>CD66b<sup>-</sup>CD64<sup>dim</sup>CD115<sup>-</sup>NCPs that, by phenotypic, transcriptomic, maturation and immunohistochemistry properties, as well as by flow cytometric side-scattered light (SSC), stand after NCP4s but precede promyelocytes during the neutropoiesis cascade. Similar to SSC<sup>lo</sup>CD45RA<sup>+</sup>NCP2s/NCP3s and SSC<sup>lo</sup>CD45RA<sup>-</sup>NCP1s/NCP4s, these cells exhibit phenotypic differences in CD45RA expression levels and, therefore, were named SSC<sup>hi</sup>CD45RA<sup>+</sup>NCP5s and SSC<sup>hi</sup>CD45RA<sup>-</sup>NCP6s. Moreover, NCP5s were more immature than NCP6s, as determined by cell differentiation and proliferative potential, as well as by transcriptomic and phenotypical features. Finally, by examining whether NCPs and all other CD66b<sup>+</sup> neutrophil precursors are altered in representative hematological malignancies, we found that, in patients with chronic-phase chronic myeloid leukemia (CP-CML), but not with systemic mastocytosis (SM), there is an increased frequency of BM NCP4s, NCP6s, and all downstream CD45RA-negative neutrophil progenitors, suggesting their expansion in CML pathogenesis. Taken together, our data advance our knowledge of human neutropoiesis.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143406019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zeyu Chen, Morgan Dragan, Peng Sun, Daniel Haensel, Remy Vu, Lian Cui, Peiyao Zhu, Nan Yang, Yuling Shi, Xing Dai
{"title":"The AhR-Ovol1-Id1 regulatory axis in keratinocytes promotes epidermal and immune homeostasis in atopic dermatitis-like skin inflammation.","authors":"Zeyu Chen, Morgan Dragan, Peng Sun, Daniel Haensel, Remy Vu, Lian Cui, Peiyao Zhu, Nan Yang, Yuling Shi, Xing Dai","doi":"10.1038/s41423-025-01264-z","DOIUrl":"10.1038/s41423-025-01264-z","url":null,"abstract":"<p><p>The skin is our outer permeability and immune defense barrier against myriad external assaults. Aryl hydrocarbon receptor (AhR) senses environmental factors and regulates barrier robustness and immune homeostasis. AhR agonists have been approved by the FDA for psoriasis treatment and are in clinical trials for the treatment of atopic dermatitis (AD), but the underlying mechanism of action remains poorly defined. Here, we report that OVOL1/Ovol1 is a conserved and direct transcriptional target of AhR in epidermal keratinocytes. We show that OVOL1/Ovol1 influences AhR-mediated regulation of keratinocyte gene expression and that OVOL1/Ovol1 ablation in keratinocytes impairs the barrier-promoting function of AhR, exacerbating AD-like inflammation. Mechanistically, we have identified Ovol1's direct downstream targets genome-wide and provided in vivo evidence supporting the role of Id1 as a functional target in barrier maintenance, disease suppression, and neutrophil accumulation. Furthermore, our findings reveal that an IL-1/dermal γδT cell axis exacerbates type 2 and 3 immune responses downstream of barrier perturbation in Ovol1-deficient AD skin. Finally, we present data suggesting the clinical relevance of OVOL1 and ID1 functions in human AD skin. Our study highlights a keratinocyte-intrinsic AhR-Ovol1-Id1 regulatory axis that promotes both epidermal and immune homeostasis in the context of skin inflammation, identifying new therapeutic targets.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143406018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hongqin You, Xiangjin Zhang, Hui Chen, Chang Liu, Da Teng, Jiajia Han, Ming Chen, Yongsheng Pang, Jianmin Zhang, Menghua Cai, Yueqi Zhao, Qingqing Dong, Shuli Wang, Yi Xu, Yu Hu, Peng Dong, Wei He
{"title":"γδ T-cell autoresponses to ectopic membrane proteins: a new type of pattern recognition.","authors":"Hongqin You, Xiangjin Zhang, Hui Chen, Chang Liu, Da Teng, Jiajia Han, Ming Chen, Yongsheng Pang, Jianmin Zhang, Menghua Cai, Yueqi Zhao, Qingqing Dong, Shuli Wang, Yi Xu, Yu Hu, Peng Dong, Wei He","doi":"10.1038/s41423-025-01258-x","DOIUrl":"10.1038/s41423-025-01258-x","url":null,"abstract":"<p><p>T-cell receptor (TCR) γδ-expressing cells are conserved lymphocytes of innate immunity involved in first-line defense and immune surveillance. TCRγδ recognizes protein/nonprotein ligands without the help of the major histocompatibility complex (MHC), especially via direct binding to protein ligands, which is dependent primarily on the δ chain complementary determining region 3 (CDR3δ). However, the mechanism of protein‒antigen recognition by human γδ TCRs remains poorly defined. We hypothesize that γδ TCRs recognize self-proteins expressed ectopically on the cell membrane that are derived from intracellular components under stress. Here, we mapped 16 intercellular self-proteins among 21,000 proteins with a huProteinChip as putative ligands for Vδ1/Vδ2 TCRs, 13 for Vδ1 TCRs and 3 for Vδ2 TCRs. Functional tests confirmed that ectopic nucleolin (NCL) is a ligand for the Vδ1 TCR, whereas protein-glutamine γ-glutamyltransferase K (TGM1) is a ligand for the Vδ2 TCR. In the context of radiation exposure, the ectopic expression of intracellular proteins on the tumor cell surface is related to the increased antitumor cytotoxicity of γδ T cells both in vitro and in vivo. In conclusion, the recognition of intracellular proteins that are ectopically expressed on somatic cells by human γδ TCRs is a basic interaction mechanism that enables new types of immune pattern recognition and a novel γδ TCR-ligand-based strategy for tumor immunotherapy.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143406020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ngar-Woon Kam, Cho Yiu Lau, Jeffrey Yan Ho Lau, Xin Dai, Yusi Liang, Syrus Pak Hei Lai, Michael King Yung Chung, Valen Zhuoyou Yu, Wenting Qiu, Mengsu Yang, Corey Smith, Rajiv Khanna, Kwan Ming Ng, Wei Dai, Chi Ming Che, Victor Ho-Fun Lee, Dora L W Kwong
{"title":"Cell-associated galectin 9 interacts with cytotoxic T cells confers resistance to tumor killing in nasopharyngeal carcinoma through autophagy activation.","authors":"Ngar-Woon Kam, Cho Yiu Lau, Jeffrey Yan Ho Lau, Xin Dai, Yusi Liang, Syrus Pak Hei Lai, Michael King Yung Chung, Valen Zhuoyou Yu, Wenting Qiu, Mengsu Yang, Corey Smith, Rajiv Khanna, Kwan Ming Ng, Wei Dai, Chi Ming Che, Victor Ho-Fun Lee, Dora L W Kwong","doi":"10.1038/s41423-024-01253-8","DOIUrl":"https://doi.org/10.1038/s41423-024-01253-8","url":null,"abstract":"<p><p>Immune effector cells, including cytotoxic T lymphocytes (CTLs) play essential roles in eliminating cancer cells. However, their functionality is often compromised, even when they infiltrate the tumor microenvironment (TME) or are transferred to cancer patients adoptively. In this study, we focused on galectin 9 (G9), an inhibitory ligand that we observed to be predominately positioned on the plasma membrane and readily interacts with CD8 + CTL in the TME of nasopharyngeal carcinoma (NPC). We discovered that cell-cell contact between activated effector CTLs and target tumor cells (TarTC) with G9 overexpression led to cellular death defects. Despite the formation of CTL-TarTC conjugates, there is no impact on the cell number nor viability of CTL, and the release of cytolytic content and associated activity were not completely abrogated. Instead, this interaction promoted autophagy and restricted necrosis in the TarTC. Furthermore, reducing G9 expression in tumor cells enhanced the suppressive effect on tumor growth upon adoptive transfer of activated effector CTL. Additionally, inhibiting autophagy effectively controlled tumor growth in cases of G9 overexpression. Therefore, we highlight the contribution of G9 in facilitating the resistance of NPC to CTL-mediated killing by inducing a selection-cell death state in tumor cells, characterized by increased autophagy and decreased necrosis.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143254825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jingyi Wu, Peng Qian, Yifeng Han, Chuning Xu, Mao Xia, Ping Zhan, Jiwu Wei, Jie Dong
{"title":"GLP1 alleviates oleic acid-propelled lipocalin-2 generation by tumor-infiltrating CD8<sup>+</sup> T cells to reduce polymorphonuclear MDSC recruitment and enhances viral immunotherapy in pancreatic cancer.","authors":"Jingyi Wu, Peng Qian, Yifeng Han, Chuning Xu, Mao Xia, Ping Zhan, Jiwu Wei, Jie Dong","doi":"10.1038/s41423-025-01260-3","DOIUrl":"https://doi.org/10.1038/s41423-025-01260-3","url":null,"abstract":"<p><p>Recruitment of polymorphonuclear MDSCs (PMN-MDSCs) in the TME suppresses the antitumor activity of tumor-infiltrating CD8<sup>+</sup> T cells (CD8<sup>+</sup> TILs). Little is known about the role of antitumoral CD8<sup>+</sup> TILs in actively initiating an immune-tolerant microenvironment, particularly in the recruitment of PMN-MDSCs. In this study, we found that immunotherapy-activated CD8<sup>+</sup> TILs significantly increased PNM-MDSC infiltration in the TME, resulting in antitumor resistance. When CD8<sup>+</sup> T cells are activated, lipocalin-2 (LCN2) expression is strongly upregulated, which significantly enhances PMN-MDSC chemotaxis. Mechanistically, immune activation increased fatty acid synthesis in CD8<sup>+</sup> T cells, particularly oleic acid (OA), which induced lysosomal membrane permeabilization, releasing cathepsin B and subsequently activating NF-κB to promote LCN2 expression. Moreover, we showed that glucagon-like peptide 1 (GLP1) effectively inhibited OA synthesis in activated CD8<sup>+</sup> T cells, reducing LCN2 production. We then developed a recombinant adenovirus encoding GLP1 (AdV-GLP1), which significantly reduced PMN-MDSC infiltration and reinvigorated the antitumor activity of CD8<sup>+</sup> TILs. In various pancreatic cancer models, including subcutaneous, orthotopic, and humanized CDX/PDX models, AdV-GLP1 displayed excellent antitumor efficacy. Our work advances the understanding of how immunotherapy-activated CD8<sup>+</sup> TILs initiate PMN-MDSC infiltration and provides a clinically relevant strategy to target this interaction and improve cancer immunotherapy.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143254842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Suguru Saito, Duo-Yao Cao, Ellen A Bernstein, Tomohiro Shibata, Anthony E Jones, Amy Rios, Aoi O Hoshi, Aleksandr B Stotland, Erika E Nishi, Jennifer E Van Eyk, Ajit Divakaruni, Zakir Khan, Kenneth E Bernstein
{"title":"Peroxisome proliferator-activated receptor alpha is an essential factor in enhanced macrophage immune function induced by angiotensin-converting enzyme.","authors":"Suguru Saito, Duo-Yao Cao, Ellen A Bernstein, Tomohiro Shibata, Anthony E Jones, Amy Rios, Aoi O Hoshi, Aleksandr B Stotland, Erika E Nishi, Jennifer E Van Eyk, Ajit Divakaruni, Zakir Khan, Kenneth E Bernstein","doi":"10.1038/s41423-025-01257-y","DOIUrl":"10.1038/s41423-025-01257-y","url":null,"abstract":"<p><p>Increased expression of angiotensin-converting enzyme (ACE) by myeloid lineage cells strongly increases the immune activity of these cells, as observed in ACE10/10 mice, which exhibit a marked increase in antitumor and antibactericidal immunity. We report that peroxisome proliferator-activated receptor alpha (PPARα), a transcription factor that regulates genes critical for lipid metabolism, is a key molecule in the enhanced macrophage function induced by ACE. Here, we used a Cre-LoxP approach with LysM-Cre to create a modified ACE10/10 mouse line in which macrophages continue to generate abundant ACE but in which monocyte and macrophage PPARα expression is selectively suppressed. These mice, termed A10-PPARα-Cre, have significantly increased growth of B16-F10 tumors compared with ACE10/10 mice with Cre expression. PPARα depletion impaired cytokine production and antigen-presenting activity in ACE-expressing macrophages, resulting in reduced tumor antigen-specific CD8<sup>+</sup> T-cell generation. Additionally, the elevated bactericidal resistance typical of ACE10/10 mice was significantly reduced in A10-PPARα-Cre mice, such that these mice resembled WT mice in their resistance to methicillin-resistant Staphylococcus aureus (MRSA) infection. THP-1 cells expressing increased ACE (termed THP-1-ACE) constitute a human macrophage model with increased PPARα that shows enhanced cytotoxicity against tumor cells and better phagocytosis and killing of MRSA. RNA silencing of PPARα in THP-1-ACE cells reduced both tumor cell death and bacterial phagocytosis and clearance. In contrast, the in vivo administration of pemafibrate, a specific agonist of PPARα, to WT and A10-PPARα-Cre mice reduced B16-F10 tumor growth by 24.5% and 25.8%, respectively, but pemafibrate reduced tumors by 57.8% in ACE10/10 mice. With pemafibrate, the number of antitumor CD8<sup>+</sup> T cells was significantly lower in A10-PPARα-Cre mice than in ACE10/10 mice. We conclude that PPARα is important in the immune system of myeloid cells, including wild-type cells, and that its increased expression by ACE-expressing macrophages in ACE10/10 mice is indispensable for ACE-dependent functional upregulation of macrophages in both mice and human cells.</p>","PeriodicalId":9950,"journal":{"name":"Cellular &Molecular Immunology","volume":" ","pages":""},"PeriodicalIF":21.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143254845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}