Klearchos K Papas, PhD

Member of the Graduate Faculty
Professor, Animal and Comparative Biomedical Sciences
Professor, BIO5 Institute
Professor, Medical Imaging - (Research Scholar Track)
Professor, Physiological Sciences - GIDP
Professor, Surgery

Klearchos Papas, PhD, is the director of the Institute for Cellular Transplantation, he has devoted his research career to the application of engineering principles and the development of enabling technologies in the fields of cell therapy and tissue engineering with a focus on the treatment of diabetes. He has studied and utilized the properties of insulin-secreting tissue and their relationship to viability and function in the context cell therapies for diabetes with the objective of improving cost-effectiveness, availability, and clinical outcomes of this approach. Prior to joining the University of Arizona in 2011, Dr. Papas served on the faculty at the University of Minnesota (2003-2011), where he held leadership positions as associate director of the Islet Transplant Program, director of Islet Processing Research and Development and director of the Islet Quality Assurance Core in the Schulze Diabetes Institute. Prior to that he held joint research positions at the Massachusetts Institute of Technology in the Department of Chemical Engineering, the Juvenile Diabetes Research Foundation (JDRF) Center for Islet Transplantation at Harvard Medical School and the Howard Hughes Medical Institute at Yale University (1999-2003). Affiliations: Dr. Papas serves on the council if the Cell Transplant and Regenerative Medicine Society (Formerly Cell Transplantation Society). He also serves on the editorial Board of the journals: Cell Transplantation, Cell Medicine, Xenotransplantation and Cell R4.

Research Interests

Dr. Papas has worked on the development and validation of equipment and assays (especially ones based on mitochondrial function such as oxygen consumption rate, OCR) for the real-time, objective assessment of islet (and other cell and tissue) quality prior to transplantation. The OCR assay has been validated based on its ability to predict diabetes reversal in rodents and clinical human islet allo transplants in patients with Type 1 Diabetes as well as islet auto transplants in patients with chronic pancreatitis. He utilized these assays along with engineering principles to optimize critical steps in the islet transplantation process. These steps include pancreas procurement, pancreas preservation, islet isolation and purification, islet culture and shipment and islet transplantation and engraftment in the recipient. He is also involved through NIH funding in research seeking improvement in organ preservation technology to extend the time window from procurement to transplantation and the use of organs from expanded-criteria donors without compromising clinical outcomes. A major focus of his current research, which is sponsored by the JDRF Encapsulation Consortium and the NIH NIDDK, is the successful clinical transplantation of islets or stem-cell derived β-cells to reverse diabetes without the need for immunosuppression. His work focuses on the optimization of β-cell viability and function post-transplantation by improving oxygenation. He utilizes novel methods for in situ oxygen delivery [via a miniaturized wearable and ultimately fully implantable (size of a few pennies), electrochemical oxygen generators] to retrievable vascularization inducing macro-encapsulation immunoisolation devices. Enhanced oxygenation to such immunoisolation devices in vivo can: 1) dramatically reduce the necessary size from that of a 40" flat-screen TV to that of a postage stamp); 2) enhance beta cell functionality (in terms of glucose-stimulated secretion within them); and 3) reduce the dose of cells required to reverse diabetes. If successfully translated to the clinic, his work in this area has the potential to have a profound impact on reducing overall costs, increasing availability, and improving short-and long-term outcomes of β-cell therapies for the treatment of diabetes while eliminating the need for immunosuppression.


  • BE: Georgia Institute of Technology, Chemical Engineering, 1990, MS: Georgia Institute of Technology, Chemical Engineering, 1992, PhD: Georgia Institute of Technology, Chemical Engineering, 1996
National Institute of Advanced Interdisciplinary Research - Tsukuba, Ibaraki, Japan, Post Doc Invited Researcher, 1996
Novartis Pharmaceuticals, Analytics/BioNMR, 1996-1999