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Vitality of pancreatic islets labeled for magnetic resonance imaging with iron particles.

Abstract：

:We previously described an in vivo method for pancreatic islet visualization using magnetic resonance imaging with the aid of superparamagnetic nanoparticles of iron oxide (Resovist) or by magnetic beads precoated with antibodies (Dynabeads). The aim of this study was to investigate the in vitro effect of islet labeling on their quality. Isolated rat islets were cultivated for 48 hours with a contrast agent or, in the case of magnetic antibody-coated beads, for only 2 hours. The ability to secrete insulin was tested by a static insulin release assay and the results were expressed as a stimulation index. Staining with propidium iodide and acridine orange was performed to determine the ratio of live to dead cells. Stimulation indices in the Resovist islets (n = 23) vs controls (n = 14) were 15.3 and 15.0, respectively, and in the Dynabeads islets (n = 15) vs controls (n = 12) 21.3 and 19.9, respectively. The vitality of the Resovist islets vs controls determined by live/dead cells ratio was 90.8% and 91.1%, respectively (n = 20), and in the Dynabeads islets vs controls was 89.4% and 91.8%, respectively (n = 11). Islet labeling with the contrast agent as well as with specific antibodies with iron beads did not change the vitality and insulin-secreting capacity assessed in vitro (P > .05). Magnetic resonance using iron nanoparticles represents the only method for in-vivo visualization of transplanted islets so far. Our data represent an important contribution for its clinical use.

journal_name

Transplant Proc

journal_title

Transplantation proceedings

authors

Berkova Z,Kriz J,Girman P,Zacharovova K,Koblas T,Dovolilova E,Saudek F

doi

10.1016/j.transproceed.2005.09.052

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

3496-8

issue

8

eissn

0041-1345

issn

1873-2623

pii

S0041-1345(05)00977-2

journal_volume

37

pub_type

杂志文章

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