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  1. Article ; Online: Resident Macrophages in the Heart: Cardioprotective Under Pressure.

    Ismahil, Mohamed Ameen / Prabhu, Sumanth D

    Circulation research

    2021  Volume 129, Issue 12, Page(s) 1102–1104

    MeSH term(s) Heart ; Macrophages
    Language English
    Publishing date 2021-12-02
    Publishing country United States
    Document type Editorial ; Research Support, N.I.H., Extramural ; Comment
    ZDB-ID 80100-8
    ISSN 1524-4571 ; 0009-7330 ; 0931-6876
    ISSN (online) 1524-4571
    ISSN 0009-7330 ; 0931-6876
    DOI 10.1161/CIRCRESAHA.121.320328
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Neutrophils are indispensable for adverse cardiac remodeling in heart failure.

    Antipenko, Sergey / Mayfield, Nicolas / Jinno, Miki / Gunzer, Matthias / Ismahil, Mohamed Ameen / Hamid, Tariq / Prabhu, Sumanth D / Rokosh, Gregg

    Journal of molecular and cellular cardiology

    2024  Volume 189, Page(s) 1–11

    Abstract: Persistent immune activation contributes significantly to left ventricular (LV) dysfunction and adverse remodeling in heart failure (HF). In contrast to their well-known essential role in acute myocardial infarction (MI) as first responders that clear ... ...

    Abstract Persistent immune activation contributes significantly to left ventricular (LV) dysfunction and adverse remodeling in heart failure (HF). In contrast to their well-known essential role in acute myocardial infarction (MI) as first responders that clear dead cells and facilitate subsequent reparative macrophage polarization, the role of neutrophils in the pathobiology of chronic ischemic HF is poorly defined. To determine the importance of neutrophils in the progression of ischemic cardiomyopathy, we measured their production, levels, and activation in a mouse model of chronic HF 8 weeks after permanent coronary artery ligation and large MI. In HF mice, neutrophils were more abundant both locally in failing myocardium (more in the border zone) and systemically in the blood, spleen, and bone marrow, together with increased BM granulopoiesis. There were heightened stimuli for neutrophil recruitment and trafficking in HF, with increased myocardial expression of the neutrophil chemoattract chemokines CXCL1 and CXCL5, and increased neutrophil chemotactic factors in the circulation. HF neutrophil NETotic activity was increased in vitro with coordinate increases in circulating neutrophil extracellular traps (NETs) in vivo. Neutrophil depletion with either antibody-based or genetic approaches abrogated the progression of LV remodeling and fibrosis at both intermediate and late stages of HF. Moreover, analogous to murine HF, the plasma milieu in human acute decompensated HF strongly promoted neutrophil trafficking. Collectively, these results support a key tissue-injurious role for neutrophils and their associated cytotoxic products in ischemic cardiomyopathy and suggest that neutrophils are potential targets for therapeutic immunomodulation in this disease.
    MeSH term(s) Humans ; Animals ; Mice ; Neutrophils/metabolism ; Ventricular Remodeling ; Heart Failure ; Myocardium/metabolism ; Myocardial Ischemia/metabolism ; Cardiomyopathies/metabolism ; Mice, Inbred C57BL
    Language English
    Publishing date 2024-02-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2024.02.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Cardiac Mesenchymal Stem Cells Promote Fibrosis and Remodeling in Heart Failure: Role of PDGF Signaling.

    Hamid, Tariq / Xu, Yuanyuan / Ismahil, Mohamed Ameen / Rokosh, Gregg / Jinno, Miki / Zhou, Guihua / Wang, Qiongxin / Prabhu, Sumanth D

    JACC. Basic to translational science

    2022  Volume 7, Issue 5, Page(s) 465–483

    Abstract: Heart failure (HF) is characterized by progressive fibrosis. Both fibroblasts and mesenchymal stem cells (MSCs) can differentiate into pro-fibrotic myofibroblasts. MSCs secrete and express platelet-derived growth factor (PDGF) and its receptors. We ... ...

    Abstract Heart failure (HF) is characterized by progressive fibrosis. Both fibroblasts and mesenchymal stem cells (MSCs) can differentiate into pro-fibrotic myofibroblasts. MSCs secrete and express platelet-derived growth factor (PDGF) and its receptors. We hypothesized that PDGF signaling in cardiac MSCs (cMSCs) promotes their myofibroblast differentiation and aggravates post-myocardial infarction left ventricular remodeling and fibrosis. We show that cMSCs from failing hearts post-myocardial infarction exhibit an altered phenotype. Inhibition of PDGF signaling in vitro inhibited cMSC-myofibroblast differentiation, whereas in vivo inhibition during established ischemic HF alleviated left ventricular remodeling and function, and decreased myocardial fibrosis, hypertrophy, and inflammation. Modulating cMSC PDGF receptor expression may thus represent a novel approach to limit pathologic cardiac fibrosis in HF.
    Language English
    Publishing date 2022-04-20
    Publishing country United States
    Document type Journal Article
    ISSN 2452-302X
    ISSN (online) 2452-302X
    DOI 10.1016/j.jacbts.2022.01.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Cardiac immune cell remodeling after myocardial infarction.

    Ismahil, Mohamed Ameen / Prabhu, Sumanth D

    Journal of molecular and cellular cardiology

    2013  Volume 62, Page(s) 142–143

    MeSH term(s) Animals ; Macrophages/cytology ; Myocardial Infarction/immunology
    Language English
    Publishing date 2013-09
    Publishing country England
    Document type Comment ; Editorial
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2013.05.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: The Apolipoprotein A-I Mimetic L-4F Attenuates Monocyte Activation and Adverse Cardiac Remodeling after Myocardial Infarction.

    Hamid, Tariq / Ismahil, Mohamed Ameen / Bansal, Shyam S / Patel, Bindiya / Goel, Mehak / White, C Roger / Anantharamaiah, G M / Prabhu, Sumanth D

    International journal of molecular sciences

    2020  Volume 21, Issue 10

    Abstract: Excessive inflammation after myocardial infarction (MI) can promote infarct expansion and adverse left ventricular (LV) remodeling. L-4F, a mimetic peptide of apolipoprotein A-I (apoA-I), exhibits anti-inflammatory and anti-atherogenic properties; ... ...

    Abstract Excessive inflammation after myocardial infarction (MI) can promote infarct expansion and adverse left ventricular (LV) remodeling. L-4F, a mimetic peptide of apolipoprotein A-I (apoA-I), exhibits anti-inflammatory and anti-atherogenic properties; however, whether L-4F imparts beneficial effects after myocardial infarction (MI) is unknown. Here we demonstrate that L-4F suppresses the expansion of blood, splenic, and myocardial pro-inflammatory monocytes and macrophages in a mouse model of reperfused MI. Changes in immune cell profiles were accompanied by alleviation of post-MI LV remodeling and dysfunction. In vitro, L-4F also inhibited pro-inflammatory and glycolytic gene expression in macrophages. In summary, L-4F treatment prevents prolonged and excessive inflammation after MI, in part through modulation of pro-inflammatory monocytes and macrophages, and improves post-MI LV remodeling. These data suggest that L-4F could be a used as a therapeutic adjunct in humans with MI to limit inflammation and alleviate the progression to heart failure.
    MeSH term(s) Animals ; Apolipoprotein A-I/metabolism ; Cell Plasticity/drug effects ; Inflammation/pathology ; Macrophage Activation/drug effects ; Macrophages/drug effects ; Macrophages/metabolism ; Macrophages/pathology ; Male ; Mice ; Mice, Inbred C57BL ; Monocytes/drug effects ; Monocytes/pathology ; Myocardial Infarction/physiopathology ; Peptides/pharmacology ; RAW 264.7 Cells ; Systole/drug effects ; Ventricular Dysfunction, Left/physiopathology ; Ventricular Remodeling/drug effects
    Chemical Substances Apolipoprotein A-I ; L-4F peptide ; Peptides
    Language English
    Publishing date 2020-05-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms21103519
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: CCR2

    Patel, Bindiya / Bansal, Shyam S / Ismahil, Mohamed Ameen / Hamid, Tariq / Rokosh, Gregg / Mack, Matthias / Prabhu, Sumanth D

    JACC. Basic to translational science

    2018  Volume 3, Issue 2, Page(s) 230–244

    Abstract: Although chronic inflammation is a central feature of heart failure (HF), the immune cell profiles differ with different underlying causes. This suggests that for immunomodulatory therapy in HF to be successful, it needs to be tailored to the specific ... ...

    Abstract Although chronic inflammation is a central feature of heart failure (HF), the immune cell profiles differ with different underlying causes. This suggests that for immunomodulatory therapy in HF to be successful, it needs to be tailored to the specific etiology. Here, the authors demonstrate that monocyte-derived C-C chemokine receptor 2 (CCR2)
    Language English
    Publishing date 2018-03-14
    Publishing country United States
    Document type Journal Article
    ISSN 2452-302X
    ISSN (online) 2452-302X
    DOI 10.1016/j.jacbts.2017.12.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Optimized protocols for isolation, fixation, and flow cytometric characterization of leukocytes in ischemic hearts.

    Covarrubias, Roman / Ismahil, Mohamed Ameen / Rokosh, Gregg / Hamid, Tariq / Accornero, Federica / Singh, Harpreet / Gumina, Richard J / Prabhu, Sumanth D / Bansal, Shyam S

    American journal of physiology. Heart and circulatory physiology

    2019  Volume 317, Issue 3, Page(s) H658–H666

    Abstract: Immune activation post-myocardial infarction is an orchestrated sequence of cellular responses to effect tissue repair and healing. However, excessive and dysregulated inflammation can result in left ventricular remodeling and pathological alterations in ...

    Abstract Immune activation post-myocardial infarction is an orchestrated sequence of cellular responses to effect tissue repair and healing. However, excessive and dysregulated inflammation can result in left ventricular remodeling and pathological alterations in the structural and mechanical attributes of the heart. Identification of key pathways and critical cellular mediators of inflammation is thus essential to design immunomodulatory therapies for myocardial infarction and ischemic heart failure. Despite this, the experimental approaches to isolate mononuclear cells from the heart are diverse, and detailed protocols to enable maximum yield of live cells in the shortest time possible are not readily available. Here, we describe optimized protocols for the isolation, fixation, and flow cytometric characterization of cardiac CD45
    MeSH term(s) Animals ; Biomarkers/analysis ; Cell Separation/methods ; Centrifugation, Density Gradient ; Disease Models, Animal ; Fixatives/chemistry ; Flow Cytometry/methods ; Immunophenotyping ; Leukocyte Common Antigens/analysis ; Leukocytes/immunology ; Leukocytes/pathology ; Male ; Mice, Inbred C57BL ; Myocardial Infarction/immunology ; Myocardial Infarction/pathology ; Myocardium/immunology ; Myocardium/pathology ; Tissue Fixation/methods
    Chemical Substances Biomarkers ; Fixatives ; Leukocyte Common Antigens (EC 3.1.3.48) ; Ptprc protein, mouse (EC 3.1.3.48)
    Language English
    Publishing date 2019-08-02
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 603838-4
    ISSN 1522-1539 ; 0363-6135
    ISSN (online) 1522-1539
    ISSN 0363-6135
    DOI 10.1152/ajpheart.00137.2019
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Mononuclear Phagocytes Are Dispensable for Cardiac Remodeling in Established Pressure-Overload Heart Failure.

    Patel, Bindiya / Ismahil, Mohamed Ameen / Hamid, Tariq / Bansal, Shyam S / Prabhu, Sumanth D

    PloS one

    2017  Volume 12, Issue 1, Page(s) e0170781

    Abstract: Background: Although cardiac and splenic mononuclear phagocytes (MPs), i.e., monocytes, macrophages and dendritic cells (DCs), are key contributors to cardiac remodeling after myocardial infarction, their role in pressure-overload remodeling is unclear. ...

    Abstract Background: Although cardiac and splenic mononuclear phagocytes (MPs), i.e., monocytes, macrophages and dendritic cells (DCs), are key contributors to cardiac remodeling after myocardial infarction, their role in pressure-overload remodeling is unclear. We tested the hypothesis that these immune cells are required for the progression of remodeling in pressure-overload heart failure (HF), and that MP depletion would ameliorate remodeling.
    Methods and results: C57BL/6 mice were subjected to transverse aortic constriction (TAC) or sham operation, and assessed for alterations in MPs. As compared with sham, TAC mice exhibited expansion of circulating LyC6hi monocytes and pro-inflammatory CD206- cardiac macrophages early (1 w) after pressure-overload, prior to significant hypertrophy and systolic dysfunction, with subsequent resolution during chronic HF. In contrast, classical DCs were expanded in the heart in a biphasic manner, with peaks both early, analogous to macrophages, and late (8 w), during established HF. There was no significant expansion of circulating DCs, or Ly6C+ monocytes and DCs in the spleen. Periodic systemic MP depletion from 2 to 16 w after TAC in macrophage Fas-induced apoptosis (MaFIA) transgenic mice did not alter cardiac remodeling progression, nor did splenectomy in mice with established HF after TAC. Lastly, adoptive transfer of splenocytes from TAC HF mice into naïve recipients did not induce immediate or long-term cardiac dysfunction in recipient mice.
    Conclusions: Mononuclear phagocytes populations expand in a phasic manner in the heart during pressure-overload. However, they are dispensable for the progression of remodeling and failure once significant hypertrophy is evident and blood monocytosis has normalized.
    MeSH term(s) Adoptive Transfer ; Animals ; Aorta/immunology ; Aorta/pathology ; Cell Count ; Constriction, Pathologic/immunology ; Constriction, Pathologic/pathology ; Dendritic Cells/immunology ; Dendritic Cells/pathology ; Dendritic Cells/transplantation ; Disease Models, Animal ; Disease Progression ; Heart Failure/immunology ; Heart Failure/pathology ; Lymphocyte Transfusion ; Lymphocytes/immunology ; Lymphocytes/pathology ; Macrophages/immunology ; Macrophages/pathology ; Macrophages/transplantation ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Monocytes/immunology ; Monocytes/pathology ; Monocytes/transplantation ; Pressure ; Spleen/immunology ; Spleen/pathology ; Ventricular Remodeling
    Language English
    Publishing date 2017
    Publishing country United States
    Document type Journal Article
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0170781
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Dysfunctional and Proinflammatory Regulatory T-Lymphocytes Are Essential for Adverse Cardiac Remodeling in Ischemic Cardiomyopathy.

    Bansal, Shyam S / Ismahil, Mohamed Ameen / Goel, Mehak / Zhou, Guihua / Rokosh, Gregg / Hamid, Tariq / Prabhu, Sumanth D

    Circulation

    2018  Volume 139, Issue 2, Page(s) 206–221

    Abstract: Background: Heart failure (HF) is a state of inappropriately sustained inflammation, suggesting the loss of normal immunosuppressive mechanisms. Regulatory T-lymphocytes (Tregs) are considered key suppressors of immune responses; however, their role in ... ...

    Abstract Background: Heart failure (HF) is a state of inappropriately sustained inflammation, suggesting the loss of normal immunosuppressive mechanisms. Regulatory T-lymphocytes (Tregs) are considered key suppressors of immune responses; however, their role in HF is unknown. We hypothesized that Tregs are dysfunctional in ischemic cardiomyopathy and HF, and they promote immune activation and left ventricular (LV) remodeling.
    Methods: Adult male wild-type C57BL/6 mice, Foxp3-diphtheria toxin receptor transgenic mice, and tumor necrosis factor (TNF) α receptor-1 (TNFR1)
    Results: Compared with wild-type sham mice, CD4
    Conclusions: Proinflammatory and antiangiogenic Tregs play an essential pathogenetic role in chronic ischemic HF to promote immune activation and pathological LV remodeling. The restoration of normal Treg function may be a viable approach to therapeutic immunomodulation in this disease.
    MeSH term(s) Angiogenic Proteins/metabolism ; Animals ; Cardiomyopathies/immunology ; Cardiomyopathies/metabolism ; Cardiomyopathies/pathology ; Cardiomyopathies/physiopathology ; Cells, Cultured ; Coculture Techniques ; Disease Models, Animal ; Endothelial Cells/immunology ; Endothelial Cells/metabolism ; Fibrosis ; Inflammation Mediators/immunology ; Inflammation Mediators/metabolism ; Male ; Mice, Inbred C57BL ; Mice, Knockout ; Myocardial Infarction/immunology ; Myocardial Infarction/metabolism ; Myocardial Infarction/pathology ; Myocardial Infarction/physiopathology ; Myocardium/immunology ; Myocardium/metabolism ; Myocardium/pathology ; Neovascularization, Physiologic ; Phenotype ; Receptors, Tumor Necrosis Factor, Type I/genetics ; Receptors, Tumor Necrosis Factor, Type I/metabolism ; Signal Transduction ; T-Lymphocytes, Regulatory/immunology ; T-Lymphocytes, Regulatory/metabolism ; Ventricular Function, Left ; Ventricular Remodeling
    Chemical Substances Angiogenic Proteins ; Inflammation Mediators ; Receptors, Tumor Necrosis Factor, Type I ; Tnfrsf1a protein, mouse
    Language English
    Publishing date 2018-12-26
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 80099-5
    ISSN 1524-4539 ; 0009-7322 ; 0069-4193 ; 0065-8499
    ISSN (online) 1524-4539
    ISSN 0009-7322 ; 0069-4193 ; 0065-8499
    DOI 10.1161/CIRCULATIONAHA.118.036065
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Mononuclear Phagocytes Are Dispensable for Cardiac Remodeling in Established Pressure-Overload Heart Failure.

    Bindiya Patel / Mohamed Ameen Ismahil / Tariq Hamid / Shyam S Bansal / Sumanth D Prabhu

    PLoS ONE, Vol 12, Iss 1, p e

    2017  Volume 0170781

    Abstract: Although cardiac and splenic mononuclear phagocytes (MPs), i.e., monocytes, macrophages and dendritic cells (DCs), are key contributors to cardiac remodeling after myocardial infarction, their role in pressure-overload remodeling is unclear. We tested ... ...

    Abstract Although cardiac and splenic mononuclear phagocytes (MPs), i.e., monocytes, macrophages and dendritic cells (DCs), are key contributors to cardiac remodeling after myocardial infarction, their role in pressure-overload remodeling is unclear. We tested the hypothesis that these immune cells are required for the progression of remodeling in pressure-overload heart failure (HF), and that MP depletion would ameliorate remodeling.C57BL/6 mice were subjected to transverse aortic constriction (TAC) or sham operation, and assessed for alterations in MPs. As compared with sham, TAC mice exhibited expansion of circulating LyC6hi monocytes and pro-inflammatory CD206- cardiac macrophages early (1 w) after pressure-overload, prior to significant hypertrophy and systolic dysfunction, with subsequent resolution during chronic HF. In contrast, classical DCs were expanded in the heart in a biphasic manner, with peaks both early, analogous to macrophages, and late (8 w), during established HF. There was no significant expansion of circulating DCs, or Ly6C+ monocytes and DCs in the spleen. Periodic systemic MP depletion from 2 to 16 w after TAC in macrophage Fas-induced apoptosis (MaFIA) transgenic mice did not alter cardiac remodeling progression, nor did splenectomy in mice with established HF after TAC. Lastly, adoptive transfer of splenocytes from TAC HF mice into naïve recipients did not induce immediate or long-term cardiac dysfunction in recipient mice.Mononuclear phagocytes populations expand in a phasic manner in the heart during pressure-overload. However, they are dispensable for the progression of remodeling and failure once significant hypertrophy is evident and blood monocytosis has normalized.
    Keywords Medicine ; R ; Science ; Q
    Subject code 610
    Language English
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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