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Britt RD, Ruwanpathirana A, Ford ML, Lewis BW. Macrophages Orchestrate Airway Inflammation, Remodeling, and Resolution in Asthma. Int J Mol Sci 2023; 24:10451. [PMID: 37445635 PMCID: PMC10341920 DOI: 10.3390/ijms241310451] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [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: 05/01/2023] [Revised: 06/14/2023] [Accepted: 06/19/2023] [Indexed: 07/15/2023] Open
Abstract
Asthma is a heterogenous chronic inflammatory lung disease with endotypes that manifest different immune system profiles, severity, and responses to current therapies. Regardless of endotype, asthma features increased immune cell infiltration, inflammatory cytokine release, and airway remodeling. Lung macrophages are also heterogenous in that there are separate subsets and, depending on the environment, different effector functions. Lung macrophages are important in recruitment of immune cells such as eosinophils, neutrophils, and monocytes that enhance allergic inflammation and initiate T helper cell responses. Persistent lung remodeling including mucus hypersecretion, increased airway smooth muscle mass, and airway fibrosis contributes to progressive lung function decline that is insensitive to current asthma treatments. Macrophages secrete inflammatory mediators that induce airway inflammation and remodeling. Additionally, lung macrophages are instrumental in protecting against pathogens and play a critical role in resolution of inflammation and return to homeostasis. This review summarizes current literature detailing the roles and existing knowledge gaps for macrophages as key inflammatory orchestrators in asthma pathogenesis. We also raise the idea that modulating inflammatory responses in lung macrophages is important for alleviating asthma.
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Affiliation(s)
- Rodney D. Britt
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (R.D.B.J.); (A.R.); (M.L.F.)
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Anushka Ruwanpathirana
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (R.D.B.J.); (A.R.); (M.L.F.)
- Biomedical Sciences Graduate Program, College of Medicine, The Ohio State University, Columbus, OH 43205, USA
| | - Maria L. Ford
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (R.D.B.J.); (A.R.); (M.L.F.)
- Biomedical Sciences Graduate Program, College of Medicine, The Ohio State University, Columbus, OH 43205, USA
| | - Brandon W. Lewis
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (R.D.B.J.); (A.R.); (M.L.F.)
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Ford ML, Ruwanpathirana A, Lewis BW, Britt RD. Aging-Related Mechanisms Contribute to Corticosteroid Insensitivity in Elderly Asthma. Int J Mol Sci 2023; 24:6347. [PMID: 37047327 PMCID: PMC10093993 DOI: 10.3390/ijms24076347] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 03/08/2023] [Revised: 03/21/2023] [Accepted: 03/23/2023] [Indexed: 03/30/2023] Open
Abstract
Asthma in elderly populations is an increasing health problem that is accompanied by diminished lung function and frequent exacerbations. As potent anti-inflammatory drugs, corticosteroids are commonly used to reduce lung inflammation, improve lung function, and manage disease symptoms in asthma. Although effective for most individuals, older patients are more insensitive to corticosteroids, making it difficult to manage asthma in this population. With the number of individuals older than 65 continuing to increase, it is important to understand the distinct mechanisms that promote corticosteroid insensitivity in the aging lung. In this review, we discuss corticosteroid insensitivity in asthma with an emphasis on mechanisms that contribute to persistent inflammation and diminished lung function in older individuals.
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Affiliation(s)
- Maria L. Ford
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (M.L.F.); (A.R.)
- Biomedical Sciences Graduate Program, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Anushka Ruwanpathirana
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (M.L.F.); (A.R.)
- Biomedical Sciences Graduate Program, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Brandon W. Lewis
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (M.L.F.); (A.R.)
| | - Rodney D. Britt
- Center for Perinatal Research, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43215, USA; (M.L.F.); (A.R.)
- Department of Pediatrics, The Ohio State University, Columbus, OH 43205, USA
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3
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Sanders BR, Townsend SE, Ford ML, Graves JL, Thomas MD. Reporting off-target effects of recombinant engineering using the pORTMAGE system. J Microbiol Methods 2023; 204:106627. [PMID: 36436701 PMCID: PMC9839536 DOI: 10.1016/j.mimet.2022.106627] [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: 08/15/2022] [Revised: 11/21/2022] [Accepted: 11/21/2022] [Indexed: 11/26/2022]
Abstract
pORTMAGE recombineering is a simple technique for incorporation of novel point mutations into bacterial genomes that eliminates off-target effects. Here we inserted point mutations into the cusS gene from Escherichia coli, then, using Illumina sequencing, report genetic variants in all mutant strains. Several off-site mutations were found at high frequency. Low frequency mutations also show high heterogeneity. This means that it is essential for studies to report all off-target effects and acknowledge the effect that this may have on resultant phenotypes.
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Affiliation(s)
| | | | - Maria L Ford
- North Carolina Agricultural and Technical State University, USA
| | - Joseph L Graves
- North Carolina Agricultural and Technical State University, USA
| | - Misty D Thomas
- North Carolina Agricultural and Technical State University, USA.
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4
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Lewis BW, Ford ML, Khan AQ, Walum J, Britt RD. Chronic Allergen Challenge Induces Corticosteroid Insensitivity With Persistent Airway Remodeling and Type 2 Inflammation. Front Pharmacol 2022; 13:855247. [PMID: 35479312 PMCID: PMC9035517 DOI: 10.3389/fphar.2022.855247] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 03/24/2022] [Indexed: 11/13/2022] Open
Abstract
Type 2-high severe asthma is described as a distinct endotype with Th2 inflammation, high eosinophil lung infiltration, impaired lung function, and reduced corticosteroid sensitivity. While the inflammatory milieu is similar to mild asthma, patients with type 2-high severe asthma likely have underlying mechanisms that sustain asthma pathophysiology despite corticosteroid treatments. Acute and chronic allergen models induce robust type 2 inflammatory responses, however differences in corticosteroid sensitivity remains poorly understood. In the present study, we sensitized and challenged mice with ovalbumin (OVA; acute model) or mixed allergens (MA; chronic model). Corticosteroid sensitivity was assessed by administering vehicle, 1, or 3 mg/kg fluticasone propionate (FP) and examining key asthmatic features such as airway inflammation, remodeling, hyperresponsiveness, and antioxidant capacity. Both acute and chronic allergen exposure exhibited enhanced AHR, immune cell infiltration, airway inflammation, and remodeling, but corticosteroids were unable to fully alleviate inflammation, AHR, and airway smooth muscle mass in MA-challenged mice. While there were no differences in antioxidant capacity, persistent IL-4+ Th2 cell population suggests the MA model induces type 2 inflammation that is insensitive to corticosteroids. Our data indicate that chronic allergen exposure is associated with more persistent type 2 immune responses and corticosteroid insensitivity. Understanding differences between acute and chronic allergen models could unlock underlying mechanisms related to type 2-high severe asthma.
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Affiliation(s)
- Brandon W. Lewis
- Center for Perinatal Research, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH, United States
| | - Maria L. Ford
- Center for Perinatal Research, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH, United States
| | - Aiman Q. Khan
- Center for Perinatal Research, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH, United States
| | - Joshua Walum
- Center for Perinatal Research, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH, United States
| | - Rodney D. Britt
- Center for Perinatal Research, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH, United States
- Department of Pediatrics, The Ohio State University, Columbus, OH, United States
- *Correspondence: Rodney D. Britt Jr,
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Badell IR, La Muraglia GM, Liu D, Wagener ME, Ding G, Ford ML. Selective CD28 Blockade Results in Superior Inhibition of Donor-Specific T Follicular Helper Cell and Antibody Responses Relative to CTLA4-Ig. Am J Transplant 2018; 18:89-101. [PMID: 28637095 PMCID: PMC5740006 DOI: 10.1111/ajt.14400] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [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: 03/20/2017] [Revised: 06/02/2017] [Accepted: 06/13/2017] [Indexed: 01/25/2023]
Abstract
Donor-specific antibodies (DSAs) are a barrier to improved long-term outcomes after kidney transplantation. Costimulation blockade with CTLA4-Ig has shown promise as a potential therapeutic strategy to control DSAs. T follicular helper (Tfh) cells, a subset of CD4+ T cells required for optimal antibody production, are reliant on the CD28 costimulatory pathway. We have previously shown that selective CD28 blockade leads to superior allograft survival through improved control of CD8+ T cells relative to CTLA4-Ig, but the impact of CD28-specific blockade on CD4+ Tfh cells is unknown. Thus, we identified and characterized donor-reactive Tfh cells in a murine skin transplant model and then used this model to evaluate the impact of selective CD28 blockade with an anti-CD28 domain antibody (dAb) on the donor-specific Tfh cell-mediated immune response. We observed that the anti-CD28 dAb led to superior inhibition of donor-reactive CXCR5+ PD-1high Tfh cells, CD95+ GL7+ germinal center B cells and DSA formation compared with CTLA4-Ig. Interestingly, donor-reactive Tfh cells differentially upregulated CTLA4 expression, suggesting an important role for CTLA4 in mediating the superior inhibition observed with the anti-CD28 dAb. Therefore, selective CD28 blockade as a novel approach to control Tfh cell responses and prevent DSA after kidney transplantation warrants further study.
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Affiliation(s)
- IR Badell
- Emory Transplant Center, Atlanta, GA, USA,Corresponding Author: I. Raul Badell, MD,
| | | | - D Liu
- Emory Transplant Center, Atlanta, GA, USA
| | - ME Wagener
- Emory Transplant Center, Atlanta, GA, USA
| | - G Ding
- Emory Transplant Center, Atlanta, GA, USA
| | - ML Ford
- Emory Transplant Center, Atlanta, GA, USA
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Mathews DV, Wakwe WC, Kim SC, Lowe MC, Breeden C, Roberts ME, Farris AB, Strobert EA, Jenkins JB, Larsen CP, Ford ML, Townsend R, Adams AB. Belatacept-Resistant Rejection Is Associated With CD28 + Memory CD8 T Cells. Am J Transplant 2017; 17:2285-2299. [PMID: 28502128 PMCID: PMC5573634 DOI: 10.1111/ajt.14349] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [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: 01/23/2017] [Revised: 04/21/2017] [Accepted: 04/21/2017] [Indexed: 01/25/2023]
Abstract
Recently, newer therapies have been designed to more specifically target rejection in an effort to improve efficacy and limit unwanted toxicity. Belatacept, a CD28-CD80/86 specific reagent, is associated with superior patient survival and graft function compared with traditional therapy, but its adoption as a mainstay immunosuppressive therapy has been tempered by increased rejection rates. It is essential that the underlying mechanisms associated with this rejection be elucidated before belatacept is more widely used. To that end, we designed a study in a nonhuman primate kidney transplant model where animals were treated with either a belatacept- or a tacrolimus-based immunosuppressive regimen. Interestingly, we found that elevated pretransplant frequencies of CD28+ CD8+ TEMRA cells are associated with rejection on belatacept but not tacrolimus treatment. Further analysis showed that the CD28+ CD8+ TEMRA cells rapidly lose CD28 expression after transplant in those animals that go on to reject with the allograft infiltrate being predominantly CD28- . These data suggest that CD28+ memory T cells may be resistant to belatacept, capable of further differentiation including loss of CD28 expression while maintaining effector function. The unique signaling requirements of CD28+ memory T cells provide opportunities for the development of targeted therapies, which may synergize with belatacept to prevent costimulation-independent rejection.
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Affiliation(s)
| | - WC Wakwe
- Emory Transplant Center, Atlanta, GA
| | - SC Kim
- Emory Transplant Center, Atlanta, GA
| | - MC Lowe
- Emory Transplant Center, Atlanta, GA
| | - C Breeden
- Emory Transplant Center, Atlanta, GA
| | | | - AB Farris
- Emory Transplant Center, Atlanta, GA
| | | | - JB Jenkins
- Yerkes National Primate Center, Atlanta, GA
| | - CP Larsen
- Emory Transplant Center, Atlanta, GA,Yerkes National Primate Center, Atlanta, GA
| | - ML Ford
- Emory Transplant Center, Atlanta, GA
| | | | - AB Adams
- Emory Transplant Center, Atlanta, GA,Yerkes National Primate Center, Atlanta, GA
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Cortes-Cerisuelo M, Laurie SJ, Mathews DV, Winterberg PD, Larsen CP, Adams AB, Ford ML. Increased Pretransplant Frequency of CD28 + CD4 + T EM Predicts Belatacept-Resistant Rejection in Human Renal Transplant Recipients. Am J Transplant 2017; 17:2350-2362. [PMID: 28502091 PMCID: PMC5599135 DOI: 10.1111/ajt.14350] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [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: 08/17/2016] [Revised: 12/20/2016] [Accepted: 01/11/2017] [Indexed: 02/07/2023]
Abstract
While most human T cells express the CD28 costimulatory molecule constitutively, it is well known that age, inflammation, and viral infection can drive the generation of CD28null T cells. In vitro studies have demonstrated that CD28null cell effector function is not impacted by the presence of the CD28 costimulation blocker belatacept. As such, a prevailing hypothesis suggests that CD28null cells may precipitate costimulation blockade-resistant rejection. However, CD28+ cells possess more proliferative and multifunctional capacity, factors that may increase their ability to successfully mediate rejection. Here, we performed a retrospective immunophenotypic analysis of adult renal transplant recipients who experienced acute rejection on belatacept treatment as compared to those who did not. Intriguingly, our findings suggest that patients possessing higher frequency of CD28+ CD4+ TEM prior to transplant were more likely to experience acute rejection following treatment with a belatacept-based immunosuppressive regimen. Mechanistically, CD28+ CD4+ TEM contained significantly more IL-2 producers. In contrast, CD28null CD4+ TEM isolated from stable belatacept-treated patients exhibited higher expression of the 2B4 coinhibitory molecule as compared to those isolated from patients who rejected. These data raise the possibility that pretransplant frequencies of CD28+ CD4+ TEM could be used as a biomarker to predict risk of rejection following treatment with belatacept.
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Affiliation(s)
| | | | | | | | | | - A B Adams
- Emory Transplant Center, Atlanta, GA
| | - M L Ford
- Emory Transplant Center, Atlanta, GA
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8
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Badell IR, Kitchens WH, Wagener ME, Lukacher AE, Larsen CP, Ford ML. Pathogen Stimulation History Impacts Donor-Specific CD8(+) T Cell Susceptibility to Costimulation/Integrin Blockade-Based Therapy. Am J Transplant 2015; 15:3081-94. [PMID: 26228897 PMCID: PMC5416935 DOI: 10.1111/ajt.13399] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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: 09/10/2014] [Revised: 05/22/2015] [Accepted: 05/26/2015] [Indexed: 01/25/2023]
Abstract
Recent studies have shown that the quantity of donor-reactive memory T cells is an important factor in determining the relative heterologous immunity barrier posed during transplantation. Here, we hypothesized that the quality of T cell memory also potently influences the response to costimulation blockade-based immunosuppression. Using a murine skin graft model of CD8(+) memory T cell-mediated costimulation blockade resistance, we elicited donor-reactive memory T cells using three distinct types of pathogen infections. Strikingly, we observed differential efficacy of a costimulation and integrin blockade regimen based on the type of pathogen used to elicit the donor-reactive memory T cell response. Intriguingly, the most immunosuppression-sensitive memory T cell populations were composed primarily of central memory cells that possessed greater recall potential, exhibited a less differentiated phenotype, and contained more multi-cytokine producers. These data, therefore, demonstrate that the memory T cell barrier is dependent on the specific type of pathogen infection via which the donor-reactive memory T cells are elicited, and suggest that the immune stimulation history of a given transplant patient may profoundly influence the relative barrier posed by heterologous immunity during transplantation.
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Affiliation(s)
- IR Badell
- Emory Transplant Center, Atlanta, GA, USA
| | | | - ME Wagener
- Emory Transplant Center, Atlanta, GA, USA
| | - AE Lukacher
- Department of Microbiology and Immunology, The Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - CP Larsen
- Emory Transplant Center, Atlanta, GA, USA
| | - ML Ford
- Emory Transplant Center, Atlanta, GA, USA
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Pinelli DF, Wakeman BS, Wagener ME, Speck SH, Ford ML. Rapamycin ameliorates the CTLA4-Ig-mediated defect in CD8(+) T cell immunity during gammaherpesvirus infection. Am J Transplant 2015; 15:2576-87. [PMID: 25989700 PMCID: PMC5389899 DOI: 10.1111/ajt.13326] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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: 11/05/2014] [Revised: 03/20/2015] [Accepted: 03/25/2015] [Indexed: 01/25/2023]
Abstract
Latent viral infections are a major concern among immunosuppressed transplant patients. During clinical trials with belatacept, a CTLA4-Ig fusion protein, patients showed an increased risk of Epstein-Barr virus-associated posttransplant lymphoproliferative disorder, thought to be due to a deficient primary CD8(+) T cell response to the virus. Using a murine model of latent viral infection, we observed that rapamycin treatment alone led to a significant increase in virus-specific CD8(+) T cells, as well as increased functionality of these cells, including the ability to make multiple cytokines, while CTLA4-Ig treatment alone significantly dampened the response and inhibited the generation of polyfunctional antigen-specific CD8(+) T cells. However, the addition of rapamycin to the CTLA4-Ig regimen was able to quantitatively and qualitatively restore the antigen-specific CD8(+) T cell response to the virus. This improvement was physiologically relevant, in that CTLA4-Ig treated animals exhibited a greater viral burden following infection that was reduced to levels observed in untreated immunocompetent animals by the addition of rapamycin. These results reveal that modulation of T cell differentiation though inhibition of mTOR signaling can restore virus-specific immune competence even in the absence of CD28 costimulation, and have implications for improving protective immunity in transplant recipients.
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Affiliation(s)
- DF Pinelli
- Emory Transplant Center and Department of Surgery, Atlanta, GA
| | | | - ME Wagener
- Emory Transplant Center and Department of Surgery, Atlanta, GA
| | - SH Speck
- Emory Vaccine Center, Atlanta, GA
| | - ML Ford
- Emory Transplant Center and Department of Surgery, Atlanta, GA,Corresponding author: Mandy Ford,
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10
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Krummey SM, Ford ML. Braking bad: novel mechanisms of CTLA-4 inhibition of T cell responses. Am J Transplant 2014; 14:2685-90. [PMID: 25387592 PMCID: PMC4364523 DOI: 10.1111/ajt.12938] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [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: 06/02/2014] [Revised: 07/02/2014] [Accepted: 07/16/2014] [Indexed: 01/25/2023]
Abstract
The coinhibitory receptor cytotoxic T-lymphocyte antigen 4 (CTLA-4) is a master regulator of T cell responses and its function is critical in models of transplant tolerance. The CD28/CTLA-4 pathway is also an important therapeutic target, as the costimulation blocker belatacept was recently approved for use following renal transplantation. While the traditional model of CTLA-4 coinhibition focuses on its ability to directly counteract CD28 costimulation, recently this paradigm has significantly broadened. Recent work has uncovered the ability of CTLA-4 to act as a cell-extrinsic coinhibitory molecule on CD4(+) T cell effectors. While it has been appreciated that CTLA-4 is required for FoxP3(+) regulatory T cell (Treg) suppression, current studies have elucidated important differences in the function of CTLA-4 on Tregs compared to effectors. CTLA-4 expression patterns also differ by T cell subset, with Th17 cells expressing significantly higher levels of CTLA-4. Thus, in contrast to the traditional model of CTLA-4 as a negative receptor to counter CD28 costimulation, recent work has begun to define CTLA-4 as a global regulator of T cell responses with subset-specific functions. Future studies must continue to uncover the molecular mechanisms that govern CTLA-4 function. These novel findings have implications for novel strategies to maximize the regulatory potential of CTLA-4 during allogeneic T cell responses.
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Pinelli DF, Wagener ME, Liu D, Yamniuk A, Tamura J, Grant S, Larsen CP, Suri A, Nadler SG, Ford ML. An anti-CD154 domain antibody prolongs graft survival and induces Foxp3(+) iTreg in the absence and presence of CTLA-4 Ig. Am J Transplant 2013; 13:3021-30. [PMID: 24007441 PMCID: PMC4287239 DOI: 10.1111/ajt.12417] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [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: 04/30/2013] [Revised: 06/14/2013] [Accepted: 07/01/2013] [Indexed: 01/25/2023]
Abstract
The use of monoclonal antibodies targeting the CD154 molecule remains one of the most effective means of promoting graft tolerance in animal models, but thromboembolic complications during early clinical trials have precluded their use in humans. Furthermore, the role of Fc-mediated deletion of CD154-expressing cells in the observed efficacy of these reagents remains controversial. Therefore, determining the requirements for anti-CD154-induced tolerance will instruct the development of safer but equally efficacious treatments. To investigate the mechanisms of action of anti-CD154 therapy, two alternative means of targeting the CD40-CD154 pathway were used: a nonagonistic anti-CD40 antibody and an Fc-silent anti-CD154 domain antibody. We compared these therapies to an Fc-intact anti-CD154 antibody in both a fully allogeneic model and a surrogate minor antigen model in which the fate of alloreactive cells could be tracked. Results indicated that anti-CD40 mAbs as well as Fc-silent anti-CD154 domain antibodies were equivalent to Fc-intact anti-CD154 mAbs in their ability to inhibit alloreactive T cell expansion, attenuate cytokine production of antigen-specific T cells and promote the conversion of Foxp3(+) iTreg. Importantly, iTreg conversion observed with Fc-silent anti-CD154 domain antibodies was preserved in the presence of CTLA4-Ig, suggesting that this therapy is a promising candidate for translation to clinical use.
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Affiliation(s)
- D F Pinelli
- Emory Transplant Center, Department of Surgery, Emory University School of Medicine, Atlanta, GA
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12
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Badell IR, Russell MC, Cardona K, Shaffer VO, Turner AP, Avila JG, Cano JA, Leopardi FV, Song M, Strobert EA, Ford ML, Pearson TC, Kirk AD, Larsen CP. CTLA4Ig prevents alloantibody formation following nonhuman primate islet transplantation using the CD40-specific antibody 3A8. Am J Transplant 2012; 12:1918-23. [PMID: 22458552 PMCID: PMC3387300 DOI: 10.1111/j.1600-6143.2012.04029.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [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] [Indexed: 01/25/2023]
Abstract
Islet transplantation to treat type 1 diabetes has been limited in part by toxicities of current immunosuppression and recipient humoral sensitization. Blockade of the CD28/CD80/86 and CD40/CD154 pathways has shown promise to remedy both these limitations, but translation has been hampered by difficulties in translating CD154-directed therapies. Prior CD40-directed regimens have led to prolonged islet survival, but fail to prevent humoral allosensitization. We therefore evaluated the addition of CTLA4Ig to a CD40 blockade-based regimen in nonhuman primate (NHP) alloislet transplantation. Diabetic rhesus macaques were transplanted allogeneic islets using the CD40-specific antibody 3A8, basiliximab induction, and sirolimus with or without CTLA4Ig maintenance therapy. Allograft survival was determined by fasting blood glucose levels and flow cytometric techniques were used to test for donor-specific antibody (DSA) formation. CTLA4Ig plus 3A8, basiliximab and sirolimus was well tolerated and induced long-term islet allograft survival. The addition of CTLA4Ig prevented DSA formation, but did not facilitate withdrawal of the 3A8-based regimen. Thus, CTLA4Ig combines with a CD40-specific regimen to prevent DSA formation in NHPs, and offers a potentially translatable calcineurin inhibitor-free protocol inclusive of a single investigational agent for use in clinical islet transplantation without relying upon CD154 blockade.
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Affiliation(s)
- I R Badell
- Emory Transplant Center, Emory University, Atlanta, GA, USA
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13
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Badell IR, Thompson PW, Turner AP, Russell MC, Avila JG, Cano JA, Robertson JM, Leopardi FV, Strobert EA, Iwakoshi NN, Reimann KA, Ford ML, Kirk AD, Larsen CP. Nondepleting anti-CD40-based therapy prolongs allograft survival in nonhuman primates. Am J Transplant 2012; 12:126-35. [PMID: 21920020 PMCID: PMC3259281 DOI: 10.1111/j.1600-6143.2011.03736.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [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] [Indexed: 01/25/2023]
Abstract
Costimulation blockade of the CD40/CD154 pathway has been effective at preventing allograft rejection in numerous transplantation models. This strategy has largely depended on mAbs directed against CD154, limiting the potential for translation due to its association with thromboembolic events. Though targeting CD40 as an alternative to CD154 has been successful at preventing allograft rejection in preclinical models, there have been no reports on the effects of CD40-specific agents in human transplant recipients. This delay in clinical translation may in part be explained by the presence of cellular depletion with many CD40-specific mAbs. As such, the optimal biologic properties of CD40-directed immunotherapy remain to be determined. In this report, we have characterized 3A8, a human CD40-specific mAb and evaluated its efficacy in a rhesus macaque model of islet cell transplantation. Despite partially agonistic properties and the inability to block CD40 binding of soluble CD154 (sCD154) in vitro, 3A8-based therapy markedly prolonged islet allograft survival without depleting B cells. Our results indicate that the allograft-protective effects of CD40-directed costimulation blockade do not require sCD154 blockade, complete antagonism or cellular depletion, and serve to support and guide the continued development of CD40-specific agents for clinical translation.
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Affiliation(s)
- I R Badell
- Emory Transplant Center, Emory University, Atlanta, GA, USA
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Turner AP, Shaffer VO, Araki K, Martens C, Turner PL, Gangappa S, Ford ML, Ahmed R, Kirk AD, Larsen CP. Sirolimus enhances the magnitude and quality of viral-specific CD8+ T-cell responses to vaccinia virus vaccination in rhesus macaques. Am J Transplant 2011; 11:613-8. [PMID: 21342450 PMCID: PMC3076606 DOI: 10.1111/j.1600-6143.2010.03407.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [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] [Indexed: 01/25/2023]
Abstract
Sirolimus is a potent antiproliferative agent used clinically to prevent renal allograft rejection. However, little is known about the effects of maintenance immunosuppressive agents on the immune response to potentially protective vaccines. Here we show that sirolimus paradoxically increases the magnitude and quality of the CD8+ T-cell response to vaccinia vaccination in nonhuman primates, fostering more robust recall responses compared to untreated and tacrolimus-treated controls. Enhancement of both the central and effector memory compartments of the vaccinia-specific CD8+ T-cell response was observed. These data elucidate new mechanistic characteristics of sirolimus and suggest immune applications extending beyond its role as an immunosuppressant.
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Affiliation(s)
- A P Turner
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA, USA
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Lo DJ, Weaver TA, Stempora L, Mehta AK, Ford ML, Larsen CP, Kirk AD. Selective targeting of human alloresponsive CD8+ effector memory T cells based on CD2 expression. Am J Transplant 2011; 11:22-33. [PMID: 21070604 PMCID: PMC3057516 DOI: 10.1111/j.1600-6143.2010.03317.x] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Costimulation blockade (CoB), specifically CD28/B7 inhibition with belatacept, is an emerging clinical replacement for calcineurin inhibitor-based immunosuppression in allotransplantation. However, there is accumulating evidence that belatacept incompletely controls alloreactive T cells that lose CD28 expression during terminal differentiation. We have recently shown that the CD2-specific fusion protein alefacept controls costimulation blockade-resistant allograft rejection in nonhuman primates. Here, we have investigated the relationship between human alloreactive T cells, costimulation blockade sensitivity and CD2 expression to determine whether these findings warrant potential clinical translation. Using polychromatic flow cytometry, we found that CD8(+) effector memory T cells are distinctly high CD2 and low CD28 expressors. Alloresponsive CD8(+) CD2(hi) CD28(-) T cells contained the highest proportion of cells with polyfunctional cytokine (IFNγ, TNF and IL-2) and cytotoxic effector molecule (CD107a and granzyme B) expression capability. Treatment with belatacept in vitro incompletely attenuated allospecific proliferation, but alefacept inhibited belatacept-resistant proliferation. These results suggest that highly alloreactive effector T cells exert their late stage functions without reliance on ongoing CD28/B7 costimulation. Their high CD2 expression increases their susceptibility to alefacept. These studies combined with in vivo nonhuman primate data provide a rationale for translation of an immunosuppression regimen pairing alefacept and belatacept to human renal transplantation.
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Affiliation(s)
- D J Lo
- Emory Transplant Center, Emory University, Atlanta, GA, USA
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Ford ML, Wagener ME, Gangappa S, Pearson TC, Larsen CP. Antigenic disparity impacts outcome of agonism but not blockade of costimulatory pathways in experimental transplant models. Am J Transplant 2007; 7:1471-81. [PMID: 17511677 DOI: 10.1111/j.1600-6143.2007.01826.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Treatment regimens consisting of CTLA-4 Ig/anti-CD154 or agonistic anti-CD28/rapamycin have both been shown to prevent GVHD in fully allogeneic murine model systems. Using a transgenic approach to track the fate of host-reactive T cells in a minor antigen disparity model of GVHD, we found that while treatment with CTLA-4 Ig/anti-CD154 retained efficacy, the costimulation agonist anti-CD28 combined with rapamycin failed to prevent GVHD. Analysis of the host-reactive CD4(+) and CD8(+) T-cell responses revealed that in contrast to CTLA-4Ig/anti-CD154-treated recipients, host-reactive T cells in recipients treated with agonistic anti-CD28/rapamycin displayed enhanced and accelerated T-cell proliferation and failed to undergo activation-induced cell death. An increase in systemic levels of inflammatory cytokines was observed in the anti-CD28/rapamycin-treated recipients of the minor but not major antigen disparity bone marrow transplants. Our results demonstrate the intricacies of costimulatory receptor signaling pathways, and reveal how agonism of the CD28 pathway can have opposing outcomes depending on the degree of antigenic disparity.
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Affiliation(s)
- M L Ford
- Department of Surgery, Emory Transplant Center, Emory University, Atlanta, GA, USA
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Affiliation(s)
- M L Ford
- Department of Oral and Maxillofacial Surgery, USAF Medical Center, Lackland Air Force Base, TX 78236-5300
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Affiliation(s)
- B M Genez
- Department of Radiology, Wilford Hall, USAF, Medical Center, Lackland Airforce Base, Texas 78236-5300
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Abstract
This study evaluated alfentanil (Alfenta, Janssen Pharmaceutica, Piscataway, NJ) as an analgesic supplement to oxygen/nitrous oxide anesthesia for outpatient oral and maxillofacial surgical procedures. Fifty American Society of Anesthesiology (ASA) class I and II patients were induced and maintained with an established regimen. Parameters measured included anesthetic properties, orientation time, recovery time, and presence of side effects. The results indicated that alfentanil provides acceptable anesthesia with minimal recovery time, but occasional side effects such as nausea and vomiting occurred postoperatively. This drug, when properly used, is a welcome addition to other established general anesthetic agents in oral and maxillofacial surgery.
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Affiliation(s)
- W A Edgin
- Department of Oral and Maxillofacial Surgery, Wilford Hall USAF Medical Center, Lackland Air Force Base, Texas
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Ash MR, Ford ML. Evaluation for conscious sedation using physical examination techniques. Gen Dent 1986; 34:272-4. [PMID: 3462085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Ford ML. Asepsis in the dental operatory: rationale and practical procedures. Va Dent J 1984; 61:12-27. [PMID: 6591631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Ford ML, Lake LR. Establishing an audit system for Air Evac. Aviat Space Environ Med 1979; 50:284-9. [PMID: 454331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Because of JCAH requirements and nursing's progression toward self-evaluation, most fixed facilities have established audit systems to determine the effectiveness of nursing intervention. Due to the transient nature of the Aeromedical Evacuation System, there was no method of evaluating the patient's care inflight. Many obstacles had to be overcome in establishing a method of evaluation; and these problems are discussed by the researchers. A pilot project was formulated to determine the validity of our audit tool. Then, 99 patients' charts were audited over a four-month period. From this data, many deficiencies in the continuity of patient care and the patient's lack of understanding concerning our system became evident. The implications of this study are far reaching and will lead to further research in the future. By disseminating these results to various hospitals, we hope to see significant improvement in patient preparation in the near future.
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Nasrallah PF, Summers JL, Ford ML. Simple transcrotal orchiectomy. Ohio State Med J 1976; 72:292-3. [PMID: 1272548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Summers JL, Ford ML, Wilkerson JE. A square bladder. Urology 1973; 2:681-2. [PMID: 4766028 DOI: 10.1016/0090-4295(73)90338-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Ford ML, Tandan B. Metastatic tumor of the spermatic cord and testis from carcinoma of the stomach: a case report. South Med J 1969; 62:352-4. [PMID: 5812734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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