Linked Life Data

11370732

Source:http://linkedlifedata.com/resource/pubmed/id/11370732

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SubjectPredicateObjectContext
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pubmed-article:11370732pubmed:dateCreated2001-5-23lld:pubmed
pubmed-article:11370732pubmed:abstractTextThe integrity and function of encapsulated parathyroid tissue following xenotransplantation is limited by oxygen and nutrition supply and capsule fibrosis. Since some of these factors depend on stability and biocompatibility of the coating material, multilayer microcapsules have been developed. Parathyroid tissue pieces and digested single cells from pigs were encapsulated in barium-alginate and in polyacrylic acid (PAA) multilayer capsules. After 7 days of culture the function of the encapsulated cells were assessed. Subsequently, in a part of the cultured microcapsules the viability was directly assessed whereas the other part was transplanted in dark animal [DA] rats for 30 days. After explantation viability and fibrotic reaction were examined. Single cells showed a significant increase in parathyroid hormone [PTH] secretion when exposed to medium low in calcium, whereas minced tissue pieces revealed necrosis without stimulatory responsiveness. Morphometry showed significantly better viability of single cells compared with minced tissue in vitro and in vivo. The fibrotic reaction against capsules with minced tissue was more pronounced than for capsules containing single cells. There was no difference between barium alginate and PAA capsules when containing minced tissue. In single cells, however, the fibrous tissue reaction differed significantly between barium alginate and PAA capsules. Encapsulated single cells of parathyroid tissue maintain detectable function and viability. In contrast minced tissue underwent necrosis and induced significantly more connective tissue reaction than single cells indicating an interrelationship between necrosis and fibrosis.lld:pubmed
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pubmed-article:11370732pubmed:pagination35-43lld:pubmed
pubmed-article:11370732pubmed:dateRevised2006-10-30lld:pubmed
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pubmed-article:11370732pubmed:year2001lld:pubmed
pubmed-article:11370732pubmed:articleTitleXenotransplantation of parathyroids in rats using barium-alginate and polyacrylic acid multilayer microcapsules.lld:pubmed
pubmed-article:11370732pubmed:affiliationInstitut für Pathologie, Universität Mainz, Germany.lld:pubmed
pubmed-article:11370732pubmed:publicationTypeJournal Articlelld:pubmed
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