1
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Cathomas F, Lin HY, Chan KL, Li L, Parise LF, Alvarez J, Durand-de Cuttoli R, Aubry AV, Muhareb S, Desland F, Shimo Y, Ramakrishnan A, Estill M, Ferrer-Pérez C, Parise EM, Wilk CM, Kaster MP, Wang J, Sowa A, Janssen WG, Costi S, Rahman A, Fernandez N, Campbell M, Swirski FK, Nestler EJ, Shen L, Merad M, Murrough JW, Russo SJ. Circulating myeloid-derived MMP8 in stress susceptibility and depression. Nature 2024; 626:1108-1115. [PMID: 38326622 PMCID: PMC10901735 DOI: 10.1038/s41586-023-07015-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 12/29/2023] [Indexed: 02/09/2024]
Abstract
Psychosocial stress has profound effects on the body, including the immune system and the brain1,2. Although a large number of pre-clinical and clinical studies have linked peripheral immune system alterations to stress-related disorders such as major depressive disorder (MDD)3, the underlying mechanisms are not well understood. Here we show that expression of a circulating myeloid cell-specific proteinase, matrix metalloproteinase 8 (MMP8), is increased in the serum of humans with MDD as well as in stress-susceptible mice following chronic social defeat stress (CSDS). In mice, we show that this increase leads to alterations in extracellular space and neurophysiological changes in the nucleus accumbens (NAc), as well as altered social behaviour. Using a combination of mass cytometry and single-cell RNA sequencing, we performed high-dimensional phenotyping of immune cells in circulation and in the brain and demonstrate that peripheral monocytes are strongly affected by stress. In stress-susceptible mice, both circulating monocytes and monocytes that traffic to the brain showed increased Mmp8 expression following chronic social defeat stress. We further demonstrate that circulating MMP8 directly infiltrates the NAc parenchyma and controls the ultrastructure of the extracellular space. Depleting MMP8 prevented stress-induced social avoidance behaviour and alterations in NAc neurophysiology and extracellular space. Collectively, these data establish a mechanism by which peripheral immune factors can affect central nervous system function and behaviour in the context of stress. Targeting specific peripheral immune cell-derived matrix metalloproteinases could constitute novel therapeutic targets for stress-related neuropsychiatric disorders.
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Affiliation(s)
- Flurin Cathomas
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
| | - Hsiao-Yun Lin
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kenny L Chan
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Long Li
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lyonna F Parise
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Johana Alvarez
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Romain Durand-de Cuttoli
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Antonio V Aubry
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Samer Muhareb
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Fiona Desland
- Department of Oncological Sciences, Marc and Jennifer Lipschultz Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Yusuke Shimo
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Aarthi Ramakrishnan
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Molly Estill
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Carmen Ferrer-Pérez
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Eric M Parise
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - C Matthias Wilk
- Department of Oncological Sciences, Marc and Jennifer Lipschultz Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Manuella P Kaster
- Department of Biochemistry, Federal University of Santa Catarina, Santa Catarina, Brazil
| | - Jun Wang
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Allison Sowa
- Microscopy CoRE and Advanced Bioimaging Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - William G Janssen
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Microscopy CoRE and Advanced Bioimaging Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sara Costi
- Depression and Anxiety Center for Discovery and Treatment, Department of Psychiatry, Icahn School of Medicine of Mount Sinai, New York, NY, USA
| | - Adeeb Rahman
- Department of Oncological Sciences, Marc and Jennifer Lipschultz Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Nicolas Fernandez
- Department of Oncological Sciences, Marc and Jennifer Lipschultz Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Matthew Campbell
- Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland
| | - Filip K Swirski
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Eric J Nestler
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Li Shen
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Miriam Merad
- Department of Oncological Sciences, Marc and Jennifer Lipschultz Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - James W Murrough
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Depression and Anxiety Center for Discovery and Treatment, Department of Psychiatry, Icahn School of Medicine of Mount Sinai, New York, NY, USA
| | - Scott J Russo
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Brain and Body Research Center of the Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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Cathomas F, Lin HY, Chan KL, Li L, Durand-de Cuttoli R, Parise LF, Aubry AV, Muhareb S, Desland F, Shimo Y, Ramakrishnan A, Estill M, Ferrer-Pérez C, Parise EM, Wang J, Sowa A, Janssen WG, Costi S, Rahman A, Fernandez N, Swirski FK, Nestler EJ, Shen L, Merad M, Murrough JW, Russo SJ. Peripheral immune-derived matrix metalloproteinase promotes stress susceptibility. Res Sq 2023:rs.3.rs-1647827. [PMID: 36778505 PMCID: PMC9915787 DOI: 10.21203/rs.3.rs-1647827/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Psychosocial stress has profound effects on the body, including the peripheral immune system and the brain1,2. Although a large number of pre-clinical and clinical studies have linked peripheral immune system alterations to stress-related disorders such as major depressive disorder (MDD)3,4,5, the underlying mechanisms are not well understood. Here we show that a peripheral myeloid cell-specific proteinase, matrix metalloproteinase 8 (MMP8), is elevated in serum of subjects with MDD as well as in stress-susceptible (SUS) mice following chronic social defeat stress (CSDS). In mice, we show that this increase leads to alterations in extracellular space and neurophysiological changes in the nucleus accumbens (NAc), thereby altering social behaviour. Using a combination of mass cytometry and single-cell RNA-sequencing, we performed high-dimensional phenotyping of immune cells in circulation and brain and demonstrate that peripheral monocytes are strongly affected by stress. Both peripheral and brain-infiltrating monocytes of SUS mice showed increased Mmp8 expression following CSDS. We further demonstrate that peripheral MMP8 directly infiltrates the NAc parenchyma to control the ultrastructure of the extracellular space. Depleting MMP8 prevented stress-induced social avoidance behaviour and alterations in NAc neurophysiology and extracellular space. Collectively, these data establish a novel mechanism by which peripheral immune factors can affect central nervous system function and behaviour in the context of stress. Targeting specific peripheral immune cell-derived matrix metalloproteinases could constitute novel therapeutic targets for stress-related neuropsychiatric disorders.
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Affiliation(s)
- Flurin Cathomas
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Hsiao-Yun Lin
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kenny L. Chan
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Long Li
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Romain Durand-de Cuttoli
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lyonna F. Parise
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Antonio V. Aubry
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Samer Muhareb
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Fiona Desland
- Department of Oncological Sciences, Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, NY, USA
| | - Yusuke Shimo
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Aarthi Ramakrishnan
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Molly Estill
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Carmen Ferrer-Pérez
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Eric M. Parise
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Jun Wang
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Allison Sowa
- Microscopy CoRE and Advanced Bioimaging Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - William G. Janssen
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Microscopy CoRE and Advanced Bioimaging Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sara Costi
- Depression and Anxiety Center for Discovery and Treatment, Department of Psychiatry, Icahn School of Medicine of Mount Sinai, New York, NY, USA
| | - Adeeb Rahman
- Department of Oncological Sciences, Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, NY, USA
| | - Nicolas Fernandez
- Department of Oncological Sciences, Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, NY, USA
| | - Filip K. Swirski
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Eric J. Nestler
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Li Shen
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Miriam Merad
- Department of Oncological Sciences, Precision Immunology Institute, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, NY, USA
| | - James W. Murrough
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Depression and Anxiety Center for Discovery and Treatment, Department of Psychiatry, Icahn School of Medicine of Mount Sinai, New York, NY, USA
| | - Scott J. Russo
- Nash Family Department of Neuroscience, Brain & Body Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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Hamon P, Magen A, Kim J, Buckup M, Troncoso L, Hamel S, Berichel JL, Barboy O, David E, Tabachnikova A, Chang C, Zhao Z, Cohen M, Giladi A, Malissen N, Desland F, Amit I, Kenigsberg E, Schwartz M, Marron T, Merad M. 685 Characterization of molecular and spatial diversity of macrophages in hepatocellular carcinoma. J Immunother Cancer 2021. [DOI: 10.1136/jitc-2021-sitc2021.685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
BackgroundHepatocellular carcinoma (HCC) has a dismal prognosis, and though checkpoint blocking antibodies have significantly improved patient outcome, many patients remain left out, highlighting the need to identify additional immune target to enhance therapeutic immunity. Macrophages (MF) are an abundant and heterogeneous population in the tumor microenvironment (TME), and are associated with a poor prognosis in multiple tumor types, including HCC, however, their molecular and functional diversity is still poorly understood.MethodsWe analyzed the molecular and spatial organization patterns of immune cells within the TME and adjacent tissue of 26 resected HCC lesions using single-cell RNA sequencing and multiplex immunohistochemistry (IHC).ResultsWe found that Kupffer cells, the self-renewing tissue-resident macrophages in liver tissue, are lacking from the TME, which is dominated by monocyte-derived macrophages. ScRNAseq followed by high-resolution clustering identified distinct MF molecular programs within the monocyte-derived macrophage compartment. One MF subset expressed a shared signature with monocytes including FCN1, S100A8 and T cell activation genes like CXCL9 and IL32. Conversely, one subset of MF expressed FOLR2, SEPP1 and genes of the complement (C1Qs), a program shared with KC in the adjacent tissue, and include another intratumoral subset enriched for the expression of TREM2 and GPNMB. Guided by these results, we are developing an IHC antibody panel that allows to visualize distinct MF localization in the TME. Intratumoral MF interface with, and potentially regulate, the T cell compartment within the TME. We are analyzing HCC tumor lesions in our treatment-naïve cohort and in patients treated with neoadjuvant anti-PD-1 therapy (NCT03916627) to study co-localization and direct interaction of MF and T cells using physically-interacting cell sequencing (PICseq). This analysis enables us to identify MF with direct cell-cell contact with T cells, and our preliminary analysis demonstrates an enrichment in MF with an immunosuppressive phenotype. We are also using spatial transcriptomic to map molecular programs of MF in the TME, that we will corroborated with additional patients.ConclusionsTaken together, our data provide a new understanding of intratumoral MF diversity and highlight the presence of specific immunoregulatory MF programs unique to tumor lesions, with subsets of these MF found to be directly interacting with T cells, potentially modulating anti-tumor responsiveness. Our analysis of resected tumor from anti-PD-1 treated patients, will allow us to correlate MF programs, and direct T cell interaction, with clinical response, and will inform therapeutic trials targeting specific MF populations so as to improve clinical efficacy of cancer immunotherapy.Trial RegistrationNCT03916627Ethics ApprovalSamples of tumor and non-involved liver were obtained from surgical specimens of patients undergoing resection at Mount Sinai Hospital (New York, NY) after obtaining informed consent in accordance with a protocol reviewed and approved by the Institutional Review Board at the Icahn School of Medicine at Mount Sinai (RUTH Human Subjects Electronic Submission System 18–00407 and 20–04150) and in collaboration with the Biorepository and Department of Pathology.
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4
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Hamon P, Magen A, Cohen M, Tabachnikova A, Chang C, Buckup M, Troncoso L, Zhao Z, Kim J, Giladi A, Malissen N, Desland F, Berichel JL, Amit I, Kenigsberg E, Schwartz M, Marron T, Merad M. Abstract 64: Characterization of molecular and spatial diversity of macrophages in hepatocellular carcinoma. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-64] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Hepatocellular carcinoma (HCC) has a dismal prognosis, and though checkpoint blocking antibodies have significantly improved patient outcome, many patients remain left out highlighting the need to identify additional immune target to enhance therapeutic immunity. Macrophages (MΦ) are an abundant and heterogeneous population in the tumor microenvironment (TME), and are associated with a poor prognosis in multiple tumor types, including HCC, however, their molecular and functional diversity is still poorly understood. We analyzed the molecular and spatial organization patterns of immune cells within the TME and adjacent tissue of 23 resected HCC lesions using single-cell RNA sequencing and multiplex immunohistochemistry (IHC). Strikingly, we found that Kupffer cells (KC), the self-renewing tissue-resident macrophages in liver tissue, are lacking from the TME, which is dominated by monocyte-derived macrophages. ScRNAseq followed by high-resolution clustering identified distinct MΦ molecular programs within the monocyte-derived macrophage compartment. One MΦ subset expressed a shared signature with monocytes including FCN1 and S100A8 in addition to T cell activation genes like CXCL9 and IL32. Conversely, one subset of MΦ expressed FOLR2, SEPP1 and genes of the complement (C1Qs), a program shared with KC in the adjacent uninvolved tissue, and include another intratumoral subset enriched for the expression of TREM2 and GPNMB. Guided by these results, we are developing an IHC antibody panel that allows to visualize distinct MΦ localization in the TME. Intratumoral MΦ interface with, and potentially regulate, the T cell compartment within the TME. We are analyzing HCC tumor lesions in our treatment-naïve cohort and in patients treated with neoadjuvant anti-PD-1 therapy (NCT03916627) to study direct interaction of MΦ and T cells using an innovative technology of physically-interacting cell sequencing (PICseq). This analysis enables us to identify MΦ with direct cell-cell contact with T cells, and our preliminary analysis demonstrates an enrichment in MΦ with a highly immunosuppressive phenotype. We are also using PICseq to map the molecular program of MΦ that are interacting with T cells and that we will corroborated with additional patients. Taken together, our data provide a new understanding of intratumoral MΦ diversity and highlight the presence of specific immunoregulatory MΦ programs unique to tumor lesions, with subsets of these MΦ found to be directly interacting with T cells, potentially modulating anti-tumor responsiveness. Our analysis of resected tumor from anti-PD-1 treated patients, will allow us to correlate MΦ programs, and direct T cell interaction, with clinical response, and will inform therapeutic trials targeting specific MΦ populations so as to improve clinical efficacy of cancer immunotherapy.
Citation Format: Pauline Hamon, Assaf Magen, Merav Cohen, Alexandra Tabachnikova, Christie Chang, Mark Buckup, Leanna Troncoso, Zhen Zhao, Joel Kim, Amir Giladi, Nausicaa Malissen, Fiona Desland, Jessica Le Berichel, Ido Amit, Ephraim Kenigsberg, Myron Schwartz, Thomas Marron, Miriam Merad. Characterization of molecular and spatial diversity of macrophages in hepatocellular carcinoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 64.
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Affiliation(s)
- Pauline Hamon
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | - Assaf Magen
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | - Merav Cohen
- 2Weizmann Institute of Science, Rehovot, Israel
| | | | | | - Mark Buckup
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | | | - Zhen Zhao
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | - Joel Kim
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | - Amir Giladi
- 2Weizmann Institute of Science, Rehovot, Israel
| | | | - Fiona Desland
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | | | - Ido Amit
- 2Weizmann Institute of Science, Rehovot, Israel
| | | | | | - Thomas Marron
- 1Icahn School of Medicine at Mount Sinai, New York, NY
| | - Miriam Merad
- 1Icahn School of Medicine at Mount Sinai, New York, NY
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5
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Pfau ML, Menard C, Cathomas F, Desland F, Kana V, Chan KL, Shimo Y, LeClair K, Flanigan ME, Aleyasin H, Walker DM, Bouchard S, Mack M, Hodes GE, Merad MM, Russo SJ. Role of Monocyte-Derived MicroRNA106b∼25 in Resilience to Social Stress. Biol Psychiatry 2019; 86:474-482. [PMID: 31101319 PMCID: PMC6717005 DOI: 10.1016/j.biopsych.2019.02.023] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 02/13/2019] [Accepted: 02/28/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Clinical studies suggest that heightened peripheral inflammation contributes to the pathogenesis of stress-related disorders, including major depressive disorder. However, the molecular mechanisms within peripheral immune cells that mediate enhanced stress vulnerability are not well known. Because microRNAs (miRs) are important regulators of immune response, we sought to examine their role in mediating inflammatory and behavioral responses to repeated social defeat stress (RSDS), a mouse model of stress vulnerability that produces susceptible and resilient phenotypes. METHODS We isolated Ly6chigh monocytes via fluorescence-activated cell sorting in the blood of susceptible and resilient mice following RSDS and profiled miR expression via quantitative real-time polymerase chain reaction. Bone marrow chimeric mice were generated to confirm a causal role of the miR-106b∼25 cluster in bone marrow-derived leukocytes in mediating stress resilience versus susceptibility. RESULTS We found that RSDS produces an increase in circulating Ly6chigh inflammatory monocytes in both susceptible and resilient mice. We next investigated whether intrinsic leukocyte posttranscriptional mechanisms contribute to individual differences in stress response and the resilient phenotype. Of the miRs profiled in our panel, eight were significantly regulated by RSDS within Ly6chigh monocytes, including miR-25-3p, a member of the miR-106b∼25 cluster. Selective knockout of the miR-106b∼25 cluster in peripheral leukocytes promoted behavioral resilience to RSDS. CONCLUSIONS Our results identify the miR-106b∼25 cluster as a key regulator of stress-induced inflammation and depression that may represent a novel therapeutic target for drug development.
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Affiliation(s)
- Madeline L Pfau
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Caroline Menard
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Department of Psychiatry and Neuroscience, Faculty of Medicine and Cervo Brain Research Center, Université Laval, Quebec City, Quebec, Canada
| | - Flurin Cathomas
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Fiona Desland
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Department of Oncological Science, Tisch Cancer Institute and Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Veronika Kana
- Department of Oncological Science, Tisch Cancer Institute and Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Kenny L Chan
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Yusuke Shimo
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Katherine LeClair
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Meghan E Flanigan
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Hossein Aleyasin
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Deena M Walker
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Sylvain Bouchard
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Matthias Mack
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Georgia E Hodes
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
| | - Miriam M Merad
- Department of Oncological Science, Tisch Cancer Institute and Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Scott J Russo
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York; Center for Affective Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York.
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6
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Marron TU, Desland F, Lavin Y, Schwartz ME, Tabrizian P, Fernandez N, Kim J, Tabachnikova A, Kamphorst AO, Schanoski AS, Brown B, Kenigsberg E, Sung MW, Taouli B, Rahman A, Merad M. Dynamic changes in the immune infiltrate within hepatocellular carcinoma tumor correlate with response to PD-1 blockade. J Clin Oncol 2019. [DOI: 10.1200/jco.2019.37.15_suppl.e15644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e15644 Background: Hepatocellular carcinoma (HCC) is the second leading cause of cancer deaths in men worldwide, and is the most rapidly rising cause of cancer mortality in the US. Patients with resectable disease experience high rates of locoregional recurrence, and there are few effective systemic treatment options available. PD-1 blockade was recently approved for 2nd line therapy, and there are promising response rates seen in the 1st-line setting. However, only 20% of patients achieve significant response, thus we must investigate further the tumor-immune microenvironment to understand how to better modulate the immune system in this highly immunosuppressive organ. Methods: We used mass cytometry (CyTOF) and cellular indexing of transcriptomes and epitopes by sequencing (CITE-seq) to study protein and transcriptomics of untreated tumor and tumor adjacent tissue, on a single-cell level. Results: Paired CyTOF analysis of 10 tumor lesions/adjacent tissues identified a significant increase in frequency of CD4+ T cells and T regulatory cells, a significant decrease in NK cells and neutrophils, and no difference in CD8+ T cells, macrophages, or dendritic cells (DCs) in the tumor microenvironment compared to the adjacent liver tissue. We also analyzed four patients who received nivolumab and subsequently went on to have their liver tumors resected; two out of the four patients treated had near-complete necrosis of their tumors (radiographically and histologically). Of note, the tumors of the two patients with significant pathologic response contained a significantly higher number of CD103+ tissue resident CD8+ and CD4+ T cells, compared to adjacent tissue. Moreover, activated CD8+ T cells (TIGIT+, PD-1+, TIM3+, and/or CD38+) were significantly higher in the tumor of nivolumab responders, indicating a tumor-specific response. We will also present single cell transcriptomic analyses of T cell and myeloid populations in responders and non-responders. Interestingly, high levels of nivolumab were detected on PD-1+ T cells in the tumor in all 4 patients; we will discuss transcriptional differences between nivolumab-targeted T cells in responders and non-responder patients. Conclusions: Based on this preliminary data we will be opening a clinical trial of neoadjuvant PD-1 blockade in HCC (NCT# pending) in March 2019.
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Affiliation(s)
| | - Fiona Desland
- Icahn School of Medicine at Mount Sinai, New York, NY
| | - Yonit Lavin
- Icahn School of Medicine at Mount Sinai, New York, NY
| | | | | | | | - Joel Kim
- Icahn School of Medicine at Mount Sinai, New York, NY
| | | | | | | | - Brian Brown
- Icahn School of Medicine at Mount Sinai, New York, NY
| | | | - Max W. Sung
- Tisch Cancer Institute at Mount Sinai, New York, NY
| | | | - Adeeb Rahman
- Icahn School of Medicine at Mount Sinai, New York, NY
| | - Miriam Merad
- Icahn School of Medicine at Mount Sinai, New York, NY
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7
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Yoshida H, Lareau CA, Ramirez RN, Rose SA, Maier B, Wroblewska A, Desland F, Chudnovskiy A, Mortha A, Dominguez C, Tellier J, Kim E, Dwyer D, Shinton S, Nabekura T, Qi Y, Yu B, Robinette M, Kim KW, Wagers A, Rhoads A, Nutt SL, Brown BD, Mostafavi S, Buenrostro JD, Benoist C. The cis-Regulatory Atlas of the Mouse Immune System. Cell 2019; 176:897-912.e20. [PMID: 30686579 PMCID: PMC6785993 DOI: 10.1016/j.cell.2018.12.036] [Citation(s) in RCA: 236] [Impact Index Per Article: 47.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 10/26/2018] [Accepted: 12/20/2018] [Indexed: 01/08/2023]
Abstract
A complete chart of cis-regulatory elements and their dynamic activity is necessary to understand the transcriptional basis of differentiation and function of an organ system. We generated matched epigenome and transcriptome measurements in 86 primary cell types that span the mouse immune system and its differentiation cascades. This breadth of data enable variance components analysis that suggests that genes fall into two distinct classes, controlled by either enhancer- or promoter-driven logic, and multiple regression that connects genes to the enhancers that regulate them. Relating transcription factor (TF) expression to the genome-wide accessibility of their binding motifs classifies them as predominantly openers or closers of local chromatin accessibility, pinpointing specific cis-regulatory elements where binding of given TFs is likely functionally relevant, validated by chromatin immunoprecipitation sequencing (ChIP-seq). Overall, this cis-regulatory atlas provides a trove of information on transcriptional regulation through immune differentiation and a foundational scaffold to define key regulatory events throughout the immunological genome.
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Affiliation(s)
- Hideyuki Yoshida
- Department of Immunology, Harvard Medical School, Boston, MA, USA; YCI Laboratory for Immunological Transcriptomics, RIKEN Center for Integrative Medical Sciences, Kanagawa, Japan
| | | | | | - Samuel A Rose
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Barbara Maier
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Aleksandra Wroblewska
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Fiona Desland
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Aleksey Chudnovskiy
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Arthur Mortha
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | | - Julie Tellier
- The Walter and Eliza Hall Institute and Department of Medical Biology, Melbourne University, Parkville, VIC, Australia
| | - Edy Kim
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA, USA
| | - Dan Dwyer
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA, USA
| | | | - Tsukasa Nabekura
- Department of Microbiology and Immunology, UCSF, San Francisco, CA, USA
| | - YiLin Qi
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Bingfei Yu
- Department of Biological Sciences, UCSD, La Jolla, CA, USA
| | - Michelle Robinette
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA
| | - Ki-Wook Kim
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA
| | - Amy Wagers
- Joslin Diabetes Center, Boston, MA, USA; Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA USA
| | - Andrew Rhoads
- Department of Immunology, Harvard Medical School, Boston, MA, USA
| | - Stephen L Nutt
- The Walter and Eliza Hall Institute and Department of Medical Biology, Melbourne University, Parkville, VIC, Australia
| | - Brian D Brown
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sara Mostafavi
- Department of Statistics and Department Medical Genetics, University of British Columbia, Vancouver, BC, Canada.
| | - Jason D Buenrostro
- Broad Institute of MIT and Harvard, Cambridge, MA, USA; Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA USA.
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Joseph JP, Mecca AP, Regenhardt RW, Bennion DM, Rodríguez V, Desland F, Patel NA, Pioquinto DJ, Unger T, Katovich MJ, Steckelings UM, Sumners C. The angiotensin type 2 receptor agonist Compound 21 elicits cerebroprotection in endothelin-1 induced ischemic stroke. Neuropharmacology 2014; 81:134-41. [PMID: 24508710 DOI: 10.1016/j.neuropharm.2014.01.044] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 01/23/2014] [Accepted: 01/27/2014] [Indexed: 12/17/2022]
Abstract
Evidence indicates that angiotensin II type 2 receptors (AT2R) exert cerebroprotective actions during stroke. A selective non-peptide AT2R agonist, Compound 21 (C21), has been shown to exert beneficial effects in models of cardiac and renal disease, as well as hemorrhagic stroke. Here, we hypothesize that C21 may exert beneficial effects against cerebral damage and neurological deficits produced by ischemic stroke. We determined the effects of central and peripheral administration of C21 on the cerebral damage and neurological deficits in rats elicited by endothelin-1 induced middle cerebral artery occlusion (MCAO), a model of cerebral ischemia. Rats infused centrally (intracerebroventricular) with C21 before endothelin-1 induced MCAO exhibited significant reductions in cerebral infarct size and the neurological deficits produced by cerebral ischemia. Similar cerebroprotection was obtained in rats injected systemically (intraperitoneal) with C21 either before or after endothelin-1 induced MCAO. The protective effects of C21 were reversed by central administration of an AT2R inhibitor, PD123319. While C21 did not alter cerebral blood flow at the doses used here, peripheral post-stroke administration of this agent significantly attenuated the MCAO-induced increases in inducible nitric oxide synthase, chemokine (C-C) motif ligand 2 and C-C chemokine receptor type 2 mRNAs in the cerebral cortex, indicating that the cerebroprotective action is associated with an anti-inflammatory effect. These results strengthen the view that AT2R agonists may have potential therapeutic value in ischemic stroke, and provide the first evidence of cerebroprotection induced by systemic post stroke administration of a selective AT2R agonist.
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Affiliation(s)
- Jason P Joseph
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Adam P Mecca
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Robert W Regenhardt
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Douglas M Bennion
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Vermali Rodríguez
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Fiona Desland
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Neal A Patel
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - David J Pioquinto
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Thomas Unger
- School for Cardiovascular Diseases, Maastricht University, Netherlands
| | - Michael J Katovich
- Department of Pharmacodynamics, University of Florida, Gainesville, FL, USA
| | - U Muscha Steckelings
- Department of Cardiovascular and Renal Research, University of Southern Denmark, Odense, Denmark
| | - Colin Sumners
- Department of Physiology and Functional Genomics & McKnight Brain Institute, University of Florida, Gainesville, FL, USA.
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Regenhardt RW, Mecca AP, Desland F, Ritucci-Chinni PF, Ludin JA, Greenstein D, Banuelos C, Bizon JL, Reinhard MK, Sumners C. Centrally administered angiotensin-(1-7) increases the survival of stroke-prone spontaneously hypertensive rats. Exp Physiol 2013; 99:442-53. [PMID: 24142453 DOI: 10.1113/expphysiol.2013.075242] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? Activation of angiotensin-converting enzyme 2, resulting in production of angiotensin-(1-7) and stimulation of its receptor, Mas, exerts beneficial actions in a number cardiovascular diseases, including ischaemic stroke. A potential beneficial role for angiotensin-(1-7) in haemorrhagic stroke has not previously been reported. What is the main finding and its importance? Central administration of angiotensin-(1-7) into stroke-prone spontaneously hypertensive rats, a model of haemorrhagic stroke, increases lifespan and improves the neurological status of these rats, as well as decreasing microglial numbers in the striatum (implying attenuation of cerebral inflammation). These actions of angiotensin-(1-7) have not previously been reported and identify this peptide as a potential new therapeutic target in haemorrhagic stroke. Angiotensin-(1-7) [Ang-(1-7)] exerts cerebroprotective effects in ischaemic stroke, and this action is associated with a blunting of intracerebral inflammatory processes and microglial activation. Given that intracerebral inflammation and microglial activation play key roles in the mechanism of injury and brain damage in both ischaemic and haemorrhagic stroke, we have investigated the potential beneficial actions of Ang-(1-7) in stroke-prone spontaneously hypertensive rats (spSHRs), an established animal model of hypertension-induced haemorrhagic stroke. Angiotensin-(1-7) was administered by continuous infusion via the intracerebroventricular route for 6 weeks into spSHRs fed a high-sodium (4%) diet, starting at 49 days of age. This treatment resulted in a significant increase in survival of the spSHRs. Median survival was 108 days in control, artificial cerebrospinal fluid-infused spSHRs and 154 days in Ang-(1-7)-treated spSHRs. This effect was partly reversed by intracerebroventricular infusion of the Mas receptor blocker, A779. This Ang-(1-7) treatment also decreased the number of haemorrhages in the striatum, improved neurological status (reduced lethargy), decreased the number of microglia in the striatum and tended to increase neuron survival at the same site. Importantly, infusions of Ang-(1-7) had no effect on kidney pathology, heart pathology, body weight, serum corticosterone levels or blood pressure. This study is the first to demonstrate the cerebroprotective actions of Ang-(1-7), including increased survival time, in spSHRs. As such, these data reveal a potential therapeutic target for haemorrhagic stroke.
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Affiliation(s)
- Robert W Regenhardt
- * Department of Physiology & Functional Genomics, University of Florida, 1600 SW Archer Road, PO Box 100274, Gainesville, FL 32610-0274, USA.
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10
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Jiang N, Shi P, Desland F, Kitchen-Pareja MC, Sumners C. Interleukin-10 inhibits angiotensin II-induced decrease in neuronal potassium current. Am J Physiol Cell Physiol 2013; 304:C801-7. [PMID: 23426971 DOI: 10.1152/ajpcell.00398.2012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previously we demonstrated that viral-mediated increased expression of the anti-inflammatory cytokine interleukin-10 within the paraventricular nucleus of the hypothalamus significantly reduces blood pressure in normal rats made hypertensive by infusion of angiotensin II. However, the exact cellular locus of this interleukin-10 action within the paraventricular nucleus is unknown. In the present study we tested whether interleukin-10 exerts direct effects at its receptors located on hypothalamic neurons to offset the neuronal excitatory actions of angiotensin II via its type 1 receptors. The results indicated the presence of immunoreactive interleukin-10 receptors on neurons in normal rat paraventricular nucleus and that receptors for this cytokine were also expressed in neurons cultured from the hypothalamus. Patch-clamp electrophysiological recordings from these cultures revealed that extracellular application of interleukin-10 alone did not exert any alterations in neuronal membrane delayed rectifier or transient potassium currents. However, angiotensin II elicited a significant decrease in delayed rectifier potassium current, an effect that was abolished by interleukin-10 application. Since decreases in delayed rectifier potassium current contribute to increased neuronal excitability, this result is consistent with a direct inhibitory action of interleukin-10 on angiotensin-induced excitation of hypothalamic neurons. As such, these data are the first indication of a neuronal locus of action of interleukin-10 to temper the actions of angiotensin II in the hypothalamus.
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Affiliation(s)
- Nan Jiang
- Department of Physiology and Functional Genomics, McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA
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