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Shive CL, Kowal CM, Desotelle AF, Nguyen Y, Carbone S, Kostadinova L, Davitkov P, O’Mara M, Reihs A, Siddiqui H, Wilson BM, Anthony DD. Endotoxemia Associated with Liver Disease Correlates with Systemic Inflammation and T Cell Exhaustion in Hepatitis C Virus Infection. Cells 2023; 12:2034. [PMID: 37626844 PMCID: PMC10453378 DOI: 10.3390/cells12162034] [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: 06/16/2023] [Revised: 07/29/2023] [Accepted: 08/04/2023] [Indexed: 08/27/2023] Open
Abstract
Both acute and chronic hepatitis C virus (HCV) infections are characterized by inflammation. HCV and reduced liver blood filtration contribute to inflammation; however, the mechanisms of systemic immune activation and dysfunction as a result of HCV infection are not clear. We measured circulating inflammatory mediators (IL-6, IP10, sCD163, sCD14), indices of endotoxemia (EndoCab, LBP, FABP), and T cell markers of exhaustion and senescence (PD-1, TIGIT, CD57, KLRG-1) in HCV-infected participants, and followed a small cohort after direct-acting anti-viral therapy. IL-6, IP10, Endocab, LBP, and FABP were elevated in HCV participants, as were T cell co-expression of exhaustion and senescence markers. We found positive associations between IL-6, IP10, EndoCab, LBP, and co-expression of T cell markers of exhaustion and senescence. We also found numerous associations between reduced liver function, as measured by plasma albumin levels, and T cell exhaustion/senescence, inflammation, and endotoxemia. We found positive associations between liver stiffness (TE score) and plasma levels of IL-6, IP10, and LBP. Lastly, plasma IP10 and the proportion of CD8 T cells co-expressing PD-1 and CD57 decreased after initiation of direct-acting anti-viral therapy. Although associations do not prove causality, our results support the model that translocation of microbial products, resulting from decreased liver blood filtration, during HCV infection drives chronic inflammation that results in T cell exhaustion/senescence and contributes to systemic immune dysfunction.
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Affiliation(s)
- Carey L. Shive
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
- Pathology Department, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Corinne M. Kowal
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Alexandra F. Desotelle
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Ynez Nguyen
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Sarah Carbone
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Lenche Kostadinova
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Perica Davitkov
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Megan O’Mara
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Alexandra Reihs
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Hinnah Siddiqui
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
| | - Brigid M. Wilson
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
- Department of Medicine, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Donald D. Anthony
- Cleveland VA Medical Center, Cleveland, OH 44106, USA; (C.M.K.); (A.F.D.); (Y.N.); (S.C.); (L.K.); (P.D.); (M.O.); (A.R.); (H.S.); (B.M.W.); (D.D.A.)
- Department of Medicine, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
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Lange A, Kostadinova L, Damjanovska S, Gad I, Syed S, Siddiqui H, Yousif P, Kowal CM, Shive C, Burant C, Singer N, Bej T, Al-Kindi S, Wilson B, Mattar M, Zidar DA, Anthony DD. Red Cell Distribution Width and Absolute Lymphocyte Count Associate With Biomarkers of Inflammation and Subsequent Mortality in Rheumatoid Arthritis. J Rheumatol 2023; 50:166-174. [PMID: 36319020 PMCID: PMC9898085 DOI: 10.3899/jrheum.211411] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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] [Accepted: 08/09/2022] [Indexed: 11/07/2022]
Abstract
OBJECTIVE Morbidity and mortality in rheumatoid arthritis (RA) is partly mitigated by maintaining immune and hematologic homeostasis. Identification of those at risk is challenging. Red cell distribution width (RDW) and absolute lymphocyte count (ALC) associate with cardiovascular disease (CVD) and mortality in the general population, and with disease activity in RA. How these variables relate to inflammation and mortality in RA was investigated. METHODS In a retrospective single Veterans Affairs (VA) Rheumatology Clinic cohort of 327 patients with RA treated with methotrexate (MTX)+/- a tumor necrosis factor (TNF) inhibitor (TNFi), we evaluated RDW and ALC before and during therapy and in relation to subsequent mortality. Findings were validated in a national VA cohort (n = 13,914). In a subset of patients and controls, we evaluated inflammatory markers. RESULTS In the local cohort, high RDW and low ALC prior to MTX treatment was associated with subsequent mortality over 10 years (both P < 0.001). The highest mortality was observed in those with both high RDW and low ALC. This remained after adjusting for age and comorbidities and was validated in the national RA cohort. In the immunology cohort, soluble and cellular inflammatory markers were higher in patients with RA than in controls. ALC correlated with age, plasma TNF receptor II, natural killer HLA-DR mean fluorescence intensity, and CD4CM/CD8CM HLA-DR/CD38%, whereas RDW associated with age and ALC. MTX initiation was followed by an increase in RDW and a decrease in ALC. TNFi therapy added to MTX resulted in an increase in ALC. CONCLUSION RDW and ALC before disease-modifying antirheumatic drug therapy are associated with biomarkers of monocyte/macrophage inflammation and subsequent mortality. The mechanistic linkage between TNF signaling and lymphopenia found here warrants further investigation.
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Affiliation(s)
- Alyssa Lange
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Lenche Kostadinova
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Sofi Damjanovska
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Ibtissam Gad
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Sameena Syed
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Husna Siddiqui
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Patrick Yousif
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Corinne M Kowal
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Carey Shive
- C. Shive, PhD, Department of Medicine, VA Medical Center and VA GRECC, and Department of Pathology, Case Western Reserve University
| | - Christopher Burant
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Nora Singer
- N. Singer, MD, Division of Rheumatology, MetroHealth Medical Center, Case Western Reserve University
| | - Taissa Bej
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Sadeer Al-Kindi
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Brigid Wilson
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Maya Mattar
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - David A Zidar
- A. Lange, MS, L. Kostadinova, MD, S. Damjanovska, MD, I. Gad, MD, S. Syed, MD, H. Siddiqui, MD, P. Yousif, MD, C.M. Kowal, BS, C. Burant, PhD, T. Bej, MS, S. Al-Kindi, MD, B. Wilson, PhD, M. Mattar, MD, D.A. Zidar, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, Case Western Reserve University
| | - Donald D Anthony
- D.D. Anthony, MD, PhD, Department of Medicine, VA Medical Center and VA GRECC, and Department of Pathology, and Division of Rheumatology, MetroHealth Medical Center, Case Western Reserve University, Cleveland, Ohio, USA.
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Shive CL, Freeman ML, Younes SA, Kowal CM, Canaday DH, Rodriguez B, Lederman MM, Anthony DD. Markers of T Cell Exhaustion and Senescence and Their Relationship to Plasma TGF-β Levels in Treated HIV+ Immune Non-responders. Front Immunol 2021; 12:638010. [PMID: 33868264 PMCID: PMC8044907 DOI: 10.3389/fimmu.2021.638010] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 02/16/2021] [Indexed: 11/23/2022] Open
Abstract
Background: Immune non-responders (INR) are HIV+, ART-controlled (>2 yrs) people who fail to reconstitute their CD4 T cell numbers. Systemic inflammation and markers of T cell senescence and exhaustion are observed in INR. This study aims to investigate T cell senescence and exhaustion and their possible association with soluble immune mediators and to understand the immune profile of HIV-infected INR. Selected participants were <50 years old to control for the confounder of older age. Methods: Plasma levels of IL-6, IP10, sCD14, sCD163, and TGF-β and markers of T cell exhaustion (PD-1, TIGIT) and senescence (CD57, KLRG-1) were measured in ART-treated, HIV+ participants grouped by CD4 T cell counts (n = 63). Immune parameters were also measured in HIV-uninfected, age distribution-matched controls (HC; n = 30). Associations between T cell markers of exhaustion and senescence and plasma levels of immune mediators were examined by Spearman rank order statistics. Results: Proportions of CD4 T cell subsets expressing markers of exhaustion (PD-1, TIGIT) and senescence (CD57, KLRG-1) were elevated in HIV+ participants. When comparing proportions between INR and IR, INR had higher proportions of CD4 memory PD-1+, EM CD57+, TEM TIGIT+ and CD8 EM and TEM TIGIT+ cells. Plasma levels of IL-6, IP10, and sCD14 were elevated during HIV infection. IP10 was higher in INR. Plasma TGF-β levels and CD4 cycling proportions of T regulatory cells were lower in INR. Proportions of CD4 T cells expressing TIGIT, PD-1, and CD57 positively correlated with plasma levels of IL-6. Plasma levels of TGF-β negatively correlated with proportions of TIGIT+ and PD-1+ T cell subsets. Conclusions: INR have lower levels of TGF-β and decreased proportions of cycling CD4 T regulatory cells and may have difficulty controlling inflammation. IP10 is elevated in INR and is linked to higher proportions of T cell exhaustion and senescence seen in INR.
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Affiliation(s)
- Carey L. Shive
- Louis Stokes Cleveland VA Medical Center, Cleveland, OH, United States
- Center for AIDS Research, Department of Pathology, Case Western Reserve University, Cleveland, OH, United States
| | - Michael L. Freeman
- Center for AIDS Research, Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, United States
| | - Souheil-Antoine Younes
- Center for AIDS Research, Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, United States
| | - Corinne M. Kowal
- Louis Stokes Cleveland VA Medical Center, Cleveland, OH, United States
| | - David H. Canaday
- Louis Stokes Cleveland VA Medical Center, Cleveland, OH, United States
- Center for AIDS Research, Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, United States
| | - Benigno Rodriguez
- Center for AIDS Research, Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, United States
| | - Michael M. Lederman
- Center for AIDS Research, Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, United States
| | - Donald D. Anthony
- Louis Stokes Cleveland VA Medical Center, Cleveland, OH, United States
- Center for AIDS Research, Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, United States
- MetroHealth Medical Center, Division of Rheumatic Disease, Case Western Reserve, Cleveland, OH, United States
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Anthony DD, Sulkowski MS, Smeaton LM, Damjanovska S, Shive CL, Kowal CM, Cohen DE, Bhattacharya D, Alston-Smith BL, Balagopal A, Wyles DL. Hepatitis C Virus (HCV) Direct-Acting Antiviral Therapy in Persons With Human Immunodeficiency Virus-HCV Genotype 1 Coinfection Resulting in High Rate of Sustained Virologic Response and Variable in Normalization of Soluble Markers of Immune Activation. J Infect Dis 2021; 222:1334-1344. [PMID: 32406487 DOI: 10.1093/infdis/jiaa254] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 01/21/2020] [Accepted: 05/06/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Hepatitis C virus (HCV) direct-acting antivirals are highly effective. Less is known about changes in markers of immune activation in persons with human immunodeficiency virus (HIV) in whom a sustained virologic response (SVR) is achieved. METHODS We conducted a nonrandomized clinical trial of 12 or 24 weeks of paritaprevir-ritonavir-ombitasvir plus dasabuvir (PrOD) with or without ribavirin in persons with HCV-1/HIV coinfection suppressed with antiretroviral therapy. Plasma HCV, soluble CD14 (sCD14), interferon-inducible protein 10, soluble CD163 (sCD163), interleukin 6 (IL-6), interleukin 18, monocyte chemoattractant protein (MCP-1), autotaxin (ATX), and Mac2-binding protein (Mac2BP) were measured over 48 weeks. RESULTS Participants were treated with PrOD for 12 (n = 9) or 24 (n = 36) weeks; the SVR rate at 12 weeks was 93%. At baseline, cirrhosis was associated with higher ATX and MCP-1, female sex with higher ATX and IL-6, older age with higher Mac2BP, higher body mass index with higher ATX, and HIV-1 protease inhibitor use with higher sCD14 levels. In those with SVR, interferon-inducible protein 10, ATX, and Mac2BP levels declined by week 2, interleukin 18 levels declined by the end of treatment, sCD14 levels did not change, and sCD163, MCP-1, and IL-6 levels changed at a single time point. CONCLUSIONS During HIV/HCV coinfection, plasma immune activation marker heterogeneity is in part attributable to age, sex, cirrhosis, body mass index, and/or type of antiretroviral therapy. HCV treatment with paritaprevir-ritonavir-ombitasvir plus dasabuvir is highly effective and is associated with variable rate and magnitude of decline in markers of immune activation. CLINICAL TRIALS REGISTRATION NCT02194998.
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Affiliation(s)
- Donald D Anthony
- Departments of Medicine and Pathology, VA Medical Center and MetroHealth Medical Center, Case Western Reserve University, ACTG Immunology Support Laboratory, Cleveland Ohio, USA
| | - Mark S Sulkowski
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Laura M Smeaton
- Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Sofi Damjanovska
- Departments of Medicine and Pathology, VA Medical Center and MetroHealth Medical Center, Case Western Reserve University, ACTG Immunology Support Laboratory, Cleveland Ohio, USA
| | - Carey L Shive
- Departments of Medicine and Pathology, VA Medical Center and MetroHealth Medical Center, Case Western Reserve University, ACTG Immunology Support Laboratory, Cleveland Ohio, USA
| | - Corinne M Kowal
- Departments of Medicine and Pathology, VA Medical Center and MetroHealth Medical Center, Case Western Reserve University, ACTG Immunology Support Laboratory, Cleveland Ohio, USA
| | | | - Debika Bhattacharya
- Division of Infectious Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | | | - Ashwin Balagopal
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - David L Wyles
- University of Colorado School of Medicine, Denver, Colorado, USA
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