title: Long-term preservation of the pig pancreas by a one-layer method for successful islet isolation.
abstract: BACKGROUND
  Pancreas preservation by two-layer method (TLM) was recently established for clinical islet transplantation. The extensive use of TLM would require enormous efforts to solve logistical and technical problems. Omitting University of Wisconsin solution (UW) as second layer would facilitate the regular application of oxygenated perfluorocarbon; (PFC). To clarify whether long-term pancreas preservation is feasible by this simplified procedure, pancreases from retired breeder pigs were subjected to 7-hour preservation utilizing PFC alone in a one-layer method (OLM, n = 8) or in combination with UW (TLM, n = 10).
  
  
  METHODS
  Resected pancreata were intraductally flushed with cold UW. Subsequently, pancreata were promptly processed (n = 6) as previously described or stored by TLM or OLM.
  
  
  RESULTS
  Compared to unstored (429200 +/- 86700 IEQ) and OLM-stored pancreases (338600 +/- 42100 IEQ), (P = ns vs unstored) postpurification islet yield decreased after TLM storage (238000 +/- 26600 IEQ, P < .05). No significant differences were found regarding purity (>90%), adenosine triphosphate (ATP) content, and viability as determined by formazan production and trypan-blue exclusion (>95%). Glucose stimulation index of freshly isolated islets (2.5 +/- 0.4) was significantly decreased after TLM storage (1.8 +/- 0.2, P < .05) but not after OLM storage (2.3 +/- 0.6). Islet transplantation in diabetic nude mice demonstrated sustained graft function in all experimental groups.
  
  
  CONCLUSIONS
  This study demonstrates that viable pig islets can be successfully isolated after prolonged ischemia utilizing PFC alone for oxygenation of cold-stored pig pancreases. The easy handling of OLM could facilitate the regular application of PFC as pancreas preservation solution.
authors.affiliation: Third Medical Department, University Hospital, Giessen, Germany. Daniel.Brandhorst@innere.med.uni-giessen.de
authors.forename: D
authors.initials: D
authors.lastname: Brandhorst
authors.forename: M
authors.initials: M
authors.lastname: Iken
authors.forename: M D
authors.initials: MD
authors.lastname: Brendel
authors.forename: R G
authors.initials: RG
authors.lastname: Bretzel
authors.forename: H
authors.initials: H
authors.lastname: Brandhorst
mesh_terms: D000241:Adenosine; D000255:Adenosine Triphosphate / Q000378:metabolism; D000493:Allopurinol; D000818:Animals; D002469:Cell Separation / Q000379:methods*; D002470:Cell Survival; D005466:Fluorocarbons; D005947:Glucose / Q000494:pharmacology; D005978:Glutathione; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D007511:Ischemia / Q000517:prevention & control; D007515:Islets of Langerhans / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D019188:Organ Preservation Solutions; D010179:Pancreas / Q000098:blood supply / Q000166:cytology*; D011887:Raffinose; D013552:Swine; D013997:Time Factors; D014021:Tissue Preservation / Q000379:methods
chemical_list: D005466:Fluorocarbons; D007328:Insulin; D019188:Organ Preservation Solutions; C055206:University of Wisconsin-lactobionate solution; D000493:Allopurinol; D000255:Adenosine Triphosphate; D005978:Glutathione; D005947:Glucose; D000241:Adenosine; D011887:Raffinose