title: Preservation of human pancreatic islet in vivo function after 6-month culture in serum-free media.
abstract: BACKGROUND
  Culturing human islets in Memphis serum-free media (M-SFM) is associated with excellent postculture recovery, in vitro function, and in vivo survival. The authors investigate the possibility of preserving islet function for extended periods (6 months) in culture and describe the in vitro and in vivo functional outcomes associated with these extended culture times.
  
  
  METHODS
  Human islets isolated from three cadaveric donor organs were cultured in M-SFM for 1, 3, or 6 months before transplantation under the kidney capsule of nonobese diabetic (NOD)-severe combined immunodeficiency (SCID) mice. In vitro function was measured by static incubation at the time of transplantation. In vivo function was assessed by measuring human insulin and C-peptide production, and by the ability of 6-month cultured islets to cure streptozotocin-induced diabetes in this mouse model.
  
  
  RESULTS
  Islet recovery ratios after 1 month in culture ranged from 85% to 88% and declined to 28% to 53% after 6 months of culture (P <0.01). Insulin stimulation indices did not differ among the fresh or the 6-month cultured preparations. All preparations cultured for 1 to 3 months functioned in the NOD-SCID mice. After 6 months of culture, two of the three preparations demonstrated in vivo function and were able to cure streptozotocin-induced diabetes.
  
  
  CONCLUSIONS
  These data demonstrate that human islets can be cultured in M-SFM for extended periods and still retain in vitro and in vivo function and the ability to cure experimental diabetes. The ability to maintain islets in culture for prolonged periods is an important step toward the development of islet tissue repositories and distribution centers.
authors.affiliation: Department of Surgery, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA.
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: Rush
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Fraga
authors.forename: Malak Y
authors.initials: MY
authors.lastname: Kotb
authors.forename: Omaima M
authors.initials: OM
authors.lastname: Sabek
authors.forename: Agnes
authors.initials: A
authors.lastname: Lo
authors.forename: Lillian W
authors.initials: LW
authors.lastname: Gaber
authors.forename: Abdel-Baset
authors.initials: AB
authors.lastname: Halim
authors.forename: A Osama
authors.initials: AO
authors.lastname: Gaber
mesh_terms: D000818:Animals; D002096:C-Peptide / Q000096:biosynthesis; D016895:Culture Media, Serum-Free; D046508:Culture Techniques; D003921:Diabetes Mellitus, Experimental / Q000503:physiopathology / Q000628:therapy; D006085:Graft Survival; D006801:Humans; D007328:Insulin / Q000096:biosynthesis; D007515:Islets of Langerhans / Q000502:physiology*; D016381:Islets of Langerhans Transplantation; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D013997:Time Factors; D014021:Tissue Preservation / Q000379:methods*; D014183:Transplantation, Heterologous
chemical_list: D002096:C-Peptide; D016895:Culture Media, Serum-Free; D007328:Insulin