Linked Life Data

17259373

Source:http://linkedlifedata.com/resource/pubmed/id/17259373

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2007-1-29
pubmed:abstractText
Islet amyloid contributes to loss of beta-cell mass and function in type 2 diabetes. It is poorly understood how the building block of amyloid, islet amyloid polypeptide (IAPP), misfolds and accumulates within the islet to contribute to cellular dysfunction. We sought to determine whether neprilysin, an amyloid-degrading enzyme, is present in islets and plays a role in the accumulation of amyloid fibrils. Human IAPP (hIAPP) transgenic mice, a model of islet amyloid in which primarily male mice develop amyloid by 12 months of age, were studied at 10 weeks and 6 months of age, enabling investigation of islet changes before and during early amyloidogenesis. Neprilysin was present in islets, including beta-cells, and islet neprilysin mRNA and activity were found to decline with age in nontransgenic mice as well as in hIAPP transgenic female mice. In contrast, neprilysin mRNA and activity did not decrease in amyloid-prone hIAPP transgenic male mice at 6 months compared with nontransgenic mice and female hIAPP transgenic mice. Islet amyloid was detected in 43% of the 6-month-old hIAPP transgenic male mice only, suggesting the sustained elevation of islet neprilysin in these mice was a compensatory mechanism aimed at preventing amyloid accumulation. In keeping with amyloid formation, the proportion of insulin-positive area to islet area was significantly reduced in 6-month-old hIAPP transgenic male mice, which also displayed mild fasting hyperglycemia compared with age-matched transgenic female and nontransgenic mice. Together, these findings demonstrate that neprilysin is a factor associated with islet amyloid accumulation and subsequent deterioration of beta-cell function in hIAPP transgenic male mice.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0012-1797
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
304-10
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Identification of the amyloid-degrading enzyme neprilysin in mouse islets and potential role in islet amyloidogenesis.
pubmed:affiliation
Division of Metabolism, Endocrinology anmd Nutrition, Department of Medicine, VA Puget Sound Health Care System, 1660 S. Columbian Way, Seattle, WA 98108, USA. zraikas@u.washington.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't