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The use of hydrogen gas clearance for blood flow measurements in single endogenous and transplanted pancreatic islets
Uppsala University, Sweden; Uppsala University, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden.
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2015 (English)In: Microvascular Research, ISSN 0026-2862, E-ISSN 1095-9319, Vol. 97, 124-129 p.Article in journal (Refereed) Published
Abstract [en]

The blood perfusion of pancreatic islets is regulated independently from that of the exocrine pancreas, and is of importance for multiple aspects of normal islet function, and probably also during impaired glucose tolerance. Single islet blood flow has been difficult to evaluate due to technical limitations. We therefore adapted a hydrogen gas washout technique using microelectrodes to allow such measurements. Platinum micro-electrodes monitored hydrogen gas clearance from individual endogenous and transplanted islets in the pancreas of male Lewis rats and in human and mouse islets implanted under the renal capsule of male athymic mice. Both in the rat endogenous pancreatic islets as well as in the intra-pancreatically transplanted islets, the vascular conductance and blood flow values displayed a highly heterogeneous distribution, varying by factors 6-10 within the same pancreas. The blood flow of human and mouse islet grafts transplanted in athymic mice was approximately 30% lower than that in the surrounding renal parenchyma. The present technique provides unique opportunities to study the islet vascular dysfunction seen after transplantation, but also allows for investigating the effects of genetic and environmental perturbations on islet blood flow at the single islet level in vivo. (C) 2014 The Authors. Published by Elsevier Inc.

Place, publisher, year, edition, pages
Elsevier , 2015. Vol. 97, 124-129 p.
Keyword [en]
Blood flow; Hydrogen gas washout; Pancreatic islets; Transplanted islets; In vivo
National Category
Clinical Medicine
URN: urn:nbn:se:liu:diva-113736DOI: 10.1016/j.mvr.2014.10.002ISI: 000346895400018PubMedID: 25446368OAI: diva2:784590

Funding Agencies|Swedish Heart and Lung Foundation [20040645]; EFSD/Novo Nordisk [300394]; Swedish Medical Research Council [521-2011-3777]; EXODIAB; Swedish Diabetes Association [2012-35]; Family Ernfors Fund

Available from: 2015-01-30 Created: 2015-01-29 Last updated: 2015-02-12

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Palm, Fredrik
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