Volume 20, Issue 8 pp. 1072-1080
Original Article

Mass cytometry reveals a distinct immunoprofile of operational tolerance in pediatric liver transplantation

Audrey H. Lau

Audrey H. Lau

Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford, CA, USA

Division of Abdominal Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA

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Matthew J. Vitalone

Matthew J. Vitalone

Division of Abdominal Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA

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Kelly Haas

Kelly Haas

Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford, CA, USA

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Todd Shawler

Todd Shawler

Division of Abdominal Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA

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Carlos O. Esquivel

Carlos O. Esquivel

Division of Abdominal Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA

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William E. Berquist

William E. Berquist

Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford, CA, USA

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Olivia M. Martinez

Olivia M. Martinez

Division of Abdominal Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA

Stanford Immunology, Stanford University School of Medicine, Stanford, CA, USA

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Ricardo O. Castillo

Ricardo O. Castillo

Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford, CA, USA

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Sheri M. Krams

Corresponding Author

Sheri M. Krams

Division of Abdominal Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA

Stanford Immunology, Stanford University School of Medicine, Stanford, CA, USA

Correspondence

Sheri M. Krams, Transplant Immunobiology Lab, Stanford University School of Medicine, Stanford, CA, USA.

Email: [email protected]

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First published: 26 October 2016
Citations: 26

Abstract

Long-term IS in transplant patients has significant morbidity, poorer quality of life, and substantial economic costs. TOL, defined as graft acceptance without functional impairment in the absence of IS, has been achieved in some pediatric LT recipients. Using mass cytometry, peripheral blood immunotyping was performed to characterize differences between tolerant patients and patients who are stable on single-agent IS. Single-cell mass cytometry was performed using blood samples from a single-center pediatric LT population of operationally tolerant patients to comprehensively characterize the immune cell populations in the tolerant state compared with patients on chronic low-dose IS. Specific T-cell populations of interest were confirmed by flow cytometry. This high-dimensional phenotypic analysis revealed distinct immunoprofiles between transplant populations as well as a CD4+ TOT (CD4+CD5+CD25+CD38−/loCD45RA) that correlates with tolerance in pediatric LT recipients. In TOL patients, the TOT was significantly increased as compared to patients stable on low levels of IS. This TOT cell was confirmed by flow cytometry and is distinct from classic Treg cells. These results demonstrate the power of mass cytometry to discover significant immune cell signatures that have diagnostic potential.

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