SURVIVAL OF ISOLATED HUMAN ISLETS OF LANGERHANS MAINTAINED IN TISSUE-CULTURE

Transplantation of human pancreatic islets to diabetic patients may require that donor islets be kept viable in vitro for extended time periods before transfer to the recipient. Isolated pancreatic islets obtained from the human cadaveric pancreas were maintained in tissue culture for 1-3 wk, after which the structure and function of the islets were studied. Electron micrographs of the cultured islets showed a satisfactory preservation of both .beta.-cells and .alpha.2-cells. After culture for 1 wk, the islet O2 uptake proceeded at a constant rate at a low glucose concentration (3.3 mM) and was significantly enhanced by raising the glucose concentration to 16.7 mM. After culture for 1 wk, the islets responded with an increased insulin release when exposed to 16.7 mM glucose with or without added theophylline (10 mM). Islets cultured for 1-3 wk incorporated [3H]leucine into proinsulin, as judged by gel filtration of acid-alcohol extracts. Glucagon release from the cultured islets was reduced significantly by 16.7 mM glucose alone but stimulated by glucose (16.7 mM) plus theophylline (10 mM). Viable pancreatic islets can be isolated from the pancreas of adult human donors and maintained in tissue culture for at least 1 wk without loss of the specific functions of the .alpha.2- and .beta.-cells. Whether such islets will survive and remain functionally competent after transplantation to human recipients is not known.