Isokinetic gradient centrifugation prolongs survival of pig islets xenografted into mice

D. Lau, B. J. Hering, A. El-Ouaghlidi, H. Jahr, H. Brandhorst, D. Brandhorst, R. Vietzke, K. Federlin, R. G. Bretzel

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6 Scopus citations


Highly purified porcine islets were prepared by isokinetic gradients performed subsequently to isopycnic gradients. This additional purification step separates ductal, vascular, and lymphoid tissue effectively from endocrine tissue. Although ductal, vascular, and lymphoid tissue comprises only a minor contamination of the islet suspensions, a significant prolongation of the survival of porcine islets xenografted into streptozotocin diabetic C57BL/6 mice can be achieved by the elimination of the non-endocrine tissue. Rejection after islet transplantation is delayed from 2.2±0.4 days (n=27) to 13.1±2.1 days (n=36), respectively, when conventionally purified and highly purified islets are compared. Irrespective of the purification state, pretreatment of islets by low temperature culture had no effect on xenograft survival.

Original languageEnglish (US)
Pages (from-to)175-177
Number of pages3
JournalJournal of Molecular Medicine
Issue number1
StatePublished - 1999


  • Islet culture
  • Islet transplantation
  • Islet xenograft rejection
  • Porcine islets of Langerhans
  • Purification


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