Beneficial effects of hyperbaric oxygen therapy on islet transplantation.
We envisage that hyperbaric oxygen (HBO) would ameliorate islet anoxia, preventing early graft failure. Thus, treatment of HBO to diabetic recipients should improve the outcome of islet transplantation. We tested this hypothesis by syngeneically transplanting insufficient number of islets (150 islets) into streptozotocin-diabetic C57BL/6 mice, each followed by HBO (2.4 ATA, 100% O2) therapy for 1.5 h from day 0 to 28, once daily (group A) or twice daily (group B), or from day 5 to 28, once daily (group C) or twice daily (group D), 6 days/week. Recipients without HBO treatment served as controls. At day 28 after transplantation, groups B, C, and D gained weight and had lower blood glucose compared with their baseline values. In addition, groups B and D had higher insulin content of the graft than the controls. To determine the optimal timing of HBO therapy, groups B and D were compared with recipients treated with HBO twice daily, 6 days/week, from day -14 to 0 (group E) and from day -14 to 28 (group F). At day 28 after transplantation, groups B, D, E, and F had significantly lower blood glucose than their individual baseline values and higher insulin content of the graft than controls. But only group F had more beta-cell mass of the graft than controls. These findings lend credence to the expectation that peritransplant application of adequate frequency of HBO to diabetic recipients would enhance the performance and growth of the islet graft, resulting in an improvement of the outcome of the transplantation.
Juang
Jyuhn-Huarng
JH
Department of Internal Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan. jjuang@adm.cgmh.org.tw
Hsu
Brend Ray-Sea
BR
Kuo
Chien-Hung
CH
Uengt
Steve Wen-Neng
SW
D000818:Animals; D001786:Blood Glucose / Q000187:drug effects / Q000502:physiology; D015687:Cell Hypoxia / Q000187:drug effects* / Q000502:physiology; D003921:Diabetes Mellitus, Experimental / Q000601:surgery*; D006084:Graft Rejection / Q000503:physiopathology / Q000517:prevention & control*; D006085:Graft Survival / Q000502:physiology*; D006931:Hyperbaric Oxygenation / Q000639:trends*; D007150:Immunohistochemistry; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000187:drug effects / Q000378:metabolism; D016381:Islets of Langerhans Transplantation / Q000379:methods* / Q000639:trends; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010100:Oxygen / Q000627:therapeutic use*; D016896:Treatment Outcome
D001786:Blood Glucose; D007328:Insulin; D010100:Oxygen