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  1. Article ; Online: Targeting Macrophages in Organ Transplantation: A Step Toward Personalized Medicine.

    Owen, Macee C / Kopecky, Benjamin J

    Transplantation

    2024  

    Abstract: Organ transplantation remains the most optimal strategy for patients with end-stage organ failure. However, prevailing methods of immunosuppression are marred by adverse side effects, and allograft rejection remains common. It is imperative to identify ... ...

    Abstract Organ transplantation remains the most optimal strategy for patients with end-stage organ failure. However, prevailing methods of immunosuppression are marred by adverse side effects, and allograft rejection remains common. It is imperative to identify and comprehensively characterize the cell types involved in allograft rejection, and develop therapies with greater specificity. There is increasing recognition that processes mediating allograft rejection are the result of interactions between innate and adaptive immune cells. Macrophages are heterogeneous innate immune cells with diverse functions that contribute to ischemia-reperfusion injury, acute rejection, and chronic rejection. Macrophages are inflammatory cells capable of innate allorecognition that strengthen their responses to secondary exposures over time via "trained immunity." However, macrophages also adopt immunoregulatory phenotypes and may promote allograft tolerance. In this review, we discuss the roles of macrophages in rejection and tolerance, and detail how macrophage plasticity and polarization influence transplantation outcomes. A comprehensive understanding of macrophages in transplant will guide future personalized approaches to therapies aimed at facilitating tolerance or mitigating the rejection process.
    Language English
    Publishing date 2024-03-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208424-7
    ISSN 1534-6080 ; 0041-1337
    ISSN (online) 1534-6080
    ISSN 0041-1337
    DOI 10.1097/TP.0000000000004978
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Farm to Table HFpEF Kitchen: Selecting the Right Ingredients for the Discerning Palate.

    Ambardekar, Amrut V / Kopecky, Benjamin J

    JACC. Basic to translational science

    2024  Volume 9, Issue 3, Page(s) 300–302

    Language English
    Publishing date 2024-03-28
    Publishing country United States
    Document type Editorial
    ISSN 2452-302X
    ISSN (online) 2452-302X
    DOI 10.1016/j.jacbts.2024.01.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Cardiac macrophage metabolism in health and disease.

    Kopecky, Benjamin J / Lavine, Kory J

    Trends in endocrinology and metabolism: TEM

    2023  Volume 35, Issue 3, Page(s) 249–262

    Abstract: Cardiac macrophages are essential mediators of cardiac development, tissue homeostasis, and response to injury. Cell-intrinsic shifts in metabolism and availability of metabolites regulate macrophage function. The human and mouse heart contain a ... ...

    Abstract Cardiac macrophages are essential mediators of cardiac development, tissue homeostasis, and response to injury. Cell-intrinsic shifts in metabolism and availability of metabolites regulate macrophage function. The human and mouse heart contain a heterogeneous compilation of cardiac macrophages that are derived from at least two distinct lineages. In this review, we detail the unique functional roles and metabolic profiles of tissue-resident and monocyte-derived cardiac macrophages during embryonic development and adult tissue homeostasis and in response to pathologic and physiologic stressors. We discuss the metabolic preferences of each macrophage lineage and how metabolism influences monocyte fate specification. Finally, we highlight the contribution of cardiac macrophages and derived metabolites on cell-cell communication, metabolic health, and disease pathogenesis.
    MeSH term(s) Mice ; Animals ; Humans ; Myocardium/metabolism ; Macrophages/metabolism ; Monocytes/metabolism ; Heart ; Homeostasis
    Language English
    Publishing date 2023-11-21
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1042384-9
    ISSN 1879-3061 ; 1043-2760
    ISSN (online) 1879-3061
    ISSN 1043-2760
    DOI 10.1016/j.tem.2023.10.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ferroptosis in the post-transplantation inflammatory response.

    Bai, Yun Zhu / Kopecky, Benjamin J / Lavine, Kory J / Kreisel, Daniel

    Cellular immunology

    2023  Volume 393-394, Page(s) 104774

    Abstract: Transplantation is a life-saving therapy for patients with end-stage organ disease. Successful outcomes after transplantation require mitigation of the post-transplant inflammatory response, limiting alloreactivity, and prevention of organ rejection. ... ...

    Abstract Transplantation is a life-saving therapy for patients with end-stage organ disease. Successful outcomes after transplantation require mitigation of the post-transplant inflammatory response, limiting alloreactivity, and prevention of organ rejection. Traditional immunosuppressive regimens aim to dampen the adaptive immune response; however, recent studies have shown the feasibility and efficacy of targeting the innate immune response. Necroinflammation initiated by donor organ cell death is implicated as a critical mediator of primary graft dysfunction, acute rejection, and chronic rejection. Ferroptosis is a form of regulated cell death that triggers post-transplantation inflammation and drives the activation of both innate and adaptive immune cells. There is a growing acceptance of the clinical relevance of ferroptosis to solid organ transplantation. Modulating ferroptosis may be a potentially promising strategy to reduce complications after organ transplantation.
    MeSH term(s) Humans ; Graft Rejection ; Ferroptosis ; Organ Transplantation ; Transplantation, Homologous ; Immunity, Innate
    Language English
    Publishing date 2023-10-07
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural
    ZDB-ID 80094-6
    ISSN 1090-2163 ; 0008-8749
    ISSN (online) 1090-2163
    ISSN 0008-8749
    DOI 10.1016/j.cellimm.2023.104774
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Baricitinib with cyclosporine eliminates acute graft rejection in fully mismatched skin and heart transplant models.

    Abboud, Ramzi / Kim, Sena / Staser, Karl / Jayasinghe, Reyka G / Lim, Sora / Amatya, Parmeshwar / Frye, C Corbin / Kopecky, Benjamin / Ritchey, Julie / Gao, Feng / Lavine, Kory / Kreisel, Daniel / DiPersio, John F / Choi, Jaebok

    Frontiers in immunology

    2023  Volume 14, Page(s) 1264496

    Abstract: Solid organ transplant represents a potentially lifesaving procedure for patients suffering from end-stage heart, lung, liver, and kidney failure. However, rejection remains a significant source of morbidity and immunosuppressive medications have ... ...

    Abstract Solid organ transplant represents a potentially lifesaving procedure for patients suffering from end-stage heart, lung, liver, and kidney failure. However, rejection remains a significant source of morbidity and immunosuppressive medications have significant toxicities. Janus kinase (JAK) inhibitors are effective immunosuppressants in autoimmune diseases and graft versus host disease after allogeneic hematopoietic cell transplantation. Here we examine the role of JAK inhibition in preclinical fully major histocompatibility mismatched skin and heart allograft models. Baricitinib combined with cyclosporine A (CsA) preserved fully major histocompatibility mismatched skin grafts for the entirety of a 111-day experimental period. In baricitinib plus CsA treated mice, circulating CD4
    MeSH term(s) Humans ; Animals ; Mice ; Cyclosporine/therapeutic use ; Graft Rejection/prevention & control ; Heart Transplantation/adverse effects ; Sulfonamides
    Chemical Substances Cyclosporine (83HN0GTJ6D) ; baricitinib (ISP4442I3Y) ; Sulfonamides
    Language English
    Publishing date 2023-09-06
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2023.1264496
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Role of donor macrophages after heart and lung transplantation.

    Kopecky, Benjamin J / Frye, Christian / Terada, Yuriko / Balsara, Keki R / Kreisel, Daniel / Lavine, Kory J

    American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons

    2020  Volume 20, Issue 5, Page(s) 1225–1235

    Abstract: Since the 1960s, heart and lung transplantation has remained the optimal therapy for patients with end-stage disease, extending and improving quality of life for thousands of individuals annually. Expanding donor organ availability and immunologic ... ...

    Abstract Since the 1960s, heart and lung transplantation has remained the optimal therapy for patients with end-stage disease, extending and improving quality of life for thousands of individuals annually. Expanding donor organ availability and immunologic compatibility is a priority to help meet the clinical demand for organ transplant. While effective, current immunosuppression is imperfect as it lacks specificity and imposes unintended adverse effects such as opportunistic infections and malignancy that limit the health and longevity of transplant recipients. In this review, we focus on donor macrophages as a new target to achieve allograft tolerance. Donor organ-directed therapies have the potential to improve allograft survival while minimizing patient harm related to global suppression of recipient immune responses. Topics highlighted include the role of ontogenically distinct donor macrophage populations in ischemia-reperfusion injury and rejection, including their interaction with allograft-infiltrating recipient immune cells and potential therapeutic approaches. Ultimately, a better understanding of how donor intrinsic immunity influences allograft acceptance and survival will provide new opportunities to improve the outcomes of transplant recipients.
    MeSH term(s) Graft Rejection/etiology ; Heart Transplantation ; Humans ; Lung Transplantation/adverse effects ; Macrophages ; Quality of Life ; Tissue Donors
    Language English
    Publishing date 2020-01-29
    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. ; Review
    ZDB-ID 2060594-8
    ISSN 1600-6143 ; 1600-6135
    ISSN (online) 1600-6143
    ISSN 1600-6135
    DOI 10.1111/ajt.15751
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Angiotensin II Type 1 Receptor Antibody-mediated Rejection Following Orthotopic Heart Transplant: A Single-center Experience.

    Moreno, Jonathan D / Verma, Amanda K / Kopecky, Benjamin J / Dehner, Carina / Kostelecky, Nicolas / Vader, Justin M / Lin, Chieh-Yu / Schilling, Joel D

    Transplantation

    2021  Volume 106, Issue 2, Page(s) 373–380

    Abstract: Background: Antibody-mediated rejection (AMR) following orthotopic heart transplant (OHT) causes significant morbidity and mortality. There are limited data on antibodies to the angiotensin II type 1 receptor antibody (AT1R-Ab) causing rejection ... ...

    Abstract Background: Antibody-mediated rejection (AMR) following orthotopic heart transplant (OHT) causes significant morbidity and mortality. There are limited data on antibodies to the angiotensin II type 1 receptor antibody (AT1R-Ab) causing rejection following OHT.
    Methods: This is a retrospective, single-center study that presents our 2-y experience with a series of 11 patients with evidence of nonspecific graft dysfunction and pathologic levels of AT1R-Ab. The clinical outcomes and treatments were compared to a group of 10 patients, also with evidence of nonspecific graft dysfunction, but who had nonsignificant AT1R-Ab titers.
    Results: The mean age of the AT1R-Ab cohort was 52% and 73% were bridged to transplant with an left ventricular assist device. The average left ventricular ejection fraction at presentation was 45%, and most were not on an angiotensin receptor blocker (ARB). Endomyocardial biopsies in those with elevated AT1R-Ab levels frequently showed reactive endothelium/endocardium without C4d or intravascular CD68 staining. Ten patients (91%) were started on an ARB. Other therapies included plasmapheresis and IVIg (64%), with 4 patients also receiving rituximab. Most patients had symptom improvement, but minimal change in graft function at an average 6 mo of follow-up.
    Conclusions: The role of AT1R-Ab-mediated rejection in OHT recipients remains poorly understood. More than half of patients at our center who presented with graft dysfunction in the absence of acute cellular rejection or AMR were found to have elevated AT1R-Ab titers. Empiric AMR treatment in conjunction with ARB therapy may improve patient outcomes. Future studies are needed to better define the optimal treatment modalities for ATR1-Ab-mediated AMR.
    MeSH term(s) Angiotensin Receptor Antagonists ; Angiotensin-Converting Enzyme Inhibitors ; Graft Rejection ; Heart Transplantation/adverse effects ; Humans ; Kidney Transplantation ; Receptor, Angiotensin, Type 1 ; Retrospective Studies ; Stroke Volume ; Ventricular Function, Left
    Chemical Substances Angiotensin Receptor Antagonists ; Angiotensin-Converting Enzyme Inhibitors ; Receptor, Angiotensin, Type 1
    Language English
    Publishing date 2021-05-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 208424-7
    ISSN 1534-6080 ; 0041-1337
    ISSN (online) 1534-6080
    ISSN 0041-1337
    DOI 10.1097/TP.0000000000003712
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Development of a CD163-Targeted PET Radiotracer That Images Resident Macrophages in Atherosclerosis.

    Zhang, Xiuli / Heo, Gyu Seong / Li, Alexandria / Lahad, Divangana / Detering, Lisa / Tao, Joan / Gao, Xuefeng / Zhang, Xiaohui / Luehmann, Hannah / Sultan, Deborah / Lou, Lanlan / Venkatesan, Rajiu / Li, Ran / Zheng, Jie / Amrute, Junedh / Lin, Chieh-Yu / Kopecky, Benjamin J / Gropler, Robert J / Bredemeyer, Andrea /
    Lavine, Kory / Liu, Yongjian

    Journal of nuclear medicine : official publication, Society of Nuclear Medicine

    2024  Volume 65, Issue 5, Page(s) 775–780

    Abstract: Tissue-resident macrophages are complementary to proinflammatory macrophages to promote the progression of atherosclerosis. The noninvasive detection of their presence and dynamic variation will be important to the understanding of their role in the ... ...

    Abstract Tissue-resident macrophages are complementary to proinflammatory macrophages to promote the progression of atherosclerosis. The noninvasive detection of their presence and dynamic variation will be important to the understanding of their role in the pathogenesis of atherosclerosis. The goal of this study was to develop a targeted PET radiotracer for imaging CD163-positive (CD163+) macrophages in multiple mouse atherosclerosis models and assess the potential of CD163 as a biomarker for atherosclerosis in humans.
    MeSH term(s) Animals ; Mice ; Positron-Emission Tomography/methods ; Antigens, Differentiation, Myelomonocytic/metabolism ; Antigens, CD/metabolism ; Atherosclerosis/diagnostic imaging ; Atherosclerosis/metabolism ; Macrophages/metabolism ; Receptors, Cell Surface/metabolism ; Humans ; Mice, Inbred C57BL ; Copper Radioisotopes ; Tissue Distribution ; Radiopharmaceuticals/pharmacokinetics
    Chemical Substances Antigens, Differentiation, Myelomonocytic ; Antigens, CD ; CD163 antigen ; Receptors, Cell Surface ; Copper Radioisotopes ; Radiopharmaceuticals
    Language English
    Publishing date 2024-05-01
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80272-4
    ISSN 1535-5667 ; 0097-9058 ; 0161-5505 ; 0022-3123
    ISSN (online) 1535-5667
    ISSN 0097-9058 ; 0161-5505 ; 0022-3123
    DOI 10.2967/jnumed.123.266910
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: The myc road to hearing restoration.

    Kopecky, Benjamin / Fritzsch, Bernd

    Cells

    2012  Volume 1, Issue 4, Page(s) 667–698

    Abstract: Current treatments for hearing loss, the most common neurosensory disorder, do not restore perfect hearing. Regeneration of lost organ of Corti hair cells through forced cell cycle re-entry of supporting cells or through manipulation of stem cells, both ... ...

    Abstract Current treatments for hearing loss, the most common neurosensory disorder, do not restore perfect hearing. Regeneration of lost organ of Corti hair cells through forced cell cycle re-entry of supporting cells or through manipulation of stem cells, both avenues towards a permanent cure, require a more complete understanding of normal inner ear development, specifically the balance of proliferation and differentiation required to form and to maintain hair cells. Direct successful alterations to the cell cycle result in cell death whereas regulation of upstream genes is insufficient to permanently alter cell cycle dynamics. The Myc gene family is uniquely situated to synergize upstream pathways into downstream cell cycle control. There are three Mycs that are embedded within the Myc/Max/Mad network to regulate proliferation. The function of the two ear expressed Mycs, N-Myc and L-Myc were unknown less than two years ago and their therapeutic potentials remain speculative. In this review, we discuss the roles the Mycs play in the body and what led us to choose them to be our candidate gene for inner ear therapies. We will summarize the recently published work describing the early and late effects of N-Myc and L-Myc on hair cell formation and maintenance. Lastly, we detail the translational significance of our findings and what future work must be performed to make the ultimate hearing aid: the regeneration of the organ of Corti.
    Language English
    Publishing date 2012-09-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2661518-6
    ISSN 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells1040667
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Donor Macrophages Modulate Rejection After Heart Transplantation.

    Kopecky, Benjamin J / Dun, Hao / Amrute, Junedh M / Lin, Chieh-Yu / Bredemeyer, Andrea L / Terada, Yuriko / Bayguinov, Peter O / Koenig, Andrew L / Frye, Christian C / Fitzpatrick, James A J / Kreisel, Daniel / Lavine, Kory J

    Circulation

    2022  Volume 146, Issue 8, Page(s) 623–638

    Abstract: Background: Cellular rejection after heart transplantation imparts significant morbidity and mortality. Current immunosuppressive strategies are imperfect, target recipient T cells, and have adverse effects. The innate immune response plays an essential ...

    Abstract Background: Cellular rejection after heart transplantation imparts significant morbidity and mortality. Current immunosuppressive strategies are imperfect, target recipient T cells, and have adverse effects. The innate immune response plays an essential role in the recruitment and activation of T cells. Targeting the donor innate immune response would represent the earliest interventional opportunity within the immune response cascade. There is limited knowledge about donor immune cell types and functions in the setting of cardiac transplantation, and no current therapeutics exist for targeting these cell populations.
    Methods: Using genetic lineage tracing, cell ablation, and conditional gene deletion, we examined donor mononuclear phagocyte diversity and macrophage function during acute cellular rejection of transplanted hearts in mice. We performed single-cell RNA sequencing on donor and recipient macrophages and monocytes at multiple time points after transplantation. On the basis of our imaging and single-cell RNA sequencing data, we evaluated the functional relevance of donor CCR2
    Results: Donor macrophages persisted in the rejecting transplanted heart and coexisted with recipient monocyte-derived macrophages. Single-cell RNA sequencing identified donor CCR2
    Conclusions: Distinct populations of donor and recipient macrophages coexist within the transplanted heart. Donor CCR2
    MeSH term(s) Animals ; Graft Rejection/prevention & control ; Heart Transplantation/adverse effects ; Humans ; Macrophages ; Mice ; Mice, Inbred C57BL ; Myeloid Differentiation Factor 88/genetics ; Tissue Donors
    Chemical Substances Myeloid Differentiation Factor 88
    Language English
    Publishing date 2022-07-26
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    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.121.057400
    Database MEDical Literature Analysis and Retrieval System OnLINE

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