Hyperbaric oxygen therapy improves early posttransplant islet function

Naoaki Sakata, Nathaniel K. Chan, Robert P. Ostrowski, John Chrisler, Pete Hayes, Sonny Kim, Andre Obenaus, John H. Zhang, Eba Hathout

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Objective: This study investigates the therapeutic potential of hyperbaric oxygen therapy (HBO) in reducing hypoxia and improving engraftment of intraportal islet transplants by promoting angiogenesis.Methods: Diabetic BALB/c mice were transplanted with 500 syngeneic islets intraportally and received six consecutive twice-daily HBO treatments (n = 9; 100% oxygen for 1 h at 2.5 atmospheres absolute) after transplantation. Dynamic contrast-enhanced magnetic resonance imaging (DCE MRI) was used to assess new vessel formation at postoperative days (POD) 3, 7, and 14. Liver tissue was recovered at the same time points for correlative histology, including: hematoxylin and eosin, hypoxia-inducible factor (HIF1α), Terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-biotin nick end labeling (TUNEL), vascular endothelial growth factor (VEGF), and von Willebrand Factor immunohistochemistry.Results: HBO therapy significantly reduced HIF-1α, TUNEL and VEGF expression in islets at POD 7. In the non-HBO transplants, liver enhancement on DCE MRI peaked at POD 7 consistent with less mature vasculature but this enhancement was suppressed at POD 7 in the HBO-treated group. The number of new peri-islet vessels at POD 7 was not significantly different between HBO and control groups.Conclusion: These results are consistent with a hyperbaric oxygen-mediated decrease in hypoxia that appeared to enhance vessel maturation in the critical days following intraportal islet transplantation.

Original languageEnglish
Pages (from-to)471-478
Number of pages8
JournalPediatric Diabetes
Volume11
Issue number7
DOIs
Publication statusPublished - 2010 Nov

Keywords

  • HBO treatment
  • HIF-1α
  • Islet transplantation
  • MRI
  • VEGF

ASJC Scopus subject areas

  • Internal Medicine
  • Pediatrics, Perinatology, and Child Health
  • Endocrinology, Diabetes and Metabolism

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