Linked Life Data

9349593

Source:http://linkedlifedata.com/resource/pubmed/id/9349593

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1998-1-15
pubmed:abstractText
A population-based study in the Netherlands has recently demonstrated that a mutation of the human insulin receptor (HIR-973 valine to methionine) is associated with hyperglycaemia and an increased prevalence of non-insulin-dependent diabetes mellitus (NIDDM). The aim of the present study was to assess whether this mutation leads to a functional alteration of the insulin receptor. We prepared the HIR-973 mutant by in vitro mutagenesis. This mutant was transiently overexpressed in HEK 293 cells either alone or together with insulin-receptor substrate-1 (IRS-1) or Shc. Insulin stimulated autophosphorylation, phosphorylation of the substrates IRS-1 and Shc as well as activation of phosphatidylinositol-3 (PI3)-kinase were studied. Autophosphorylation of HIR-973 and its susceptibility to hyperglycaemia induced inhibition was not different from HIR-wt. Human insulin receptor with a juxtamembrane deletion HIR-deltaJM which is known to impair HIR/IRS-1 interaction was used as control. While the HIR-deltaJM induces a reduced IRS-1 phosphorylation HIR-973 showed even a slightly increased ability to phosphorylate IRS-1 (n = 7, 115% of control, p < 0.01). Shc phosphorylation was only mediated by HIR-wt and HIR-973 but not by HIR-deltaJM. Again a tendency to higher phosphorylation of Shc was seen with HIR-973 (n = 7, 109% of control, NS). When PI3-kinase activity was measured in IRS-1 precipitates similar activity was found for HIR-wt and HIR-973 whereas PI3-kinase stimulation was reduced with HIR-deltaJM. In summary, the data suggest that HIR-973 does not impair the first steps of the insulin signalling cascade. It is therefore unlikely that this mutation may cause cellular insulin resistance. The close vicinity of this mutation to insulin receptor domains which are involved in IRS-1 and Shc binding may, however, alter the interaction of the insulin receptor with these substrates. This could explain the slightly increased insulin effect on tyrosine phosphorylation of these docking proteins. These characteristics of HIR-973 might have a compensatory function of impaired signal transduction further downstream of the signalling chain in this specific subgroup of NIDDM patients.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0012-186X
pubmed:author
pubmed:issnType
Print
pubmed:volume
40
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1135-40
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:9349593-Animals, pubmed-meshheading:9349593-Antimetabolites, pubmed-meshheading:9349593-Blotting, Western, pubmed-meshheading:9349593-Cell Line, pubmed-meshheading:9349593-Deoxyglucose, pubmed-meshheading:9349593-Dose-Response Relationship, Drug, pubmed-meshheading:9349593-Humans, pubmed-meshheading:9349593-Immune Sera, pubmed-meshheading:9349593-Insulin, pubmed-meshheading:9349593-Insulin Receptor Substrate Proteins, pubmed-meshheading:9349593-Mice, pubmed-meshheading:9349593-Mutation, pubmed-meshheading:9349593-Phosphatidylinositol 3-Kinases, pubmed-meshheading:9349593-Phosphoproteins, pubmed-meshheading:9349593-Phosphorylation, pubmed-meshheading:9349593-Rabbits, pubmed-meshheading:9349593-Receptor, Insulin, pubmed-meshheading:9349593-Signal Transduction, pubmed-meshheading:9349593-Transfection, pubmed-meshheading:9349593-src Homology Domains
pubmed:year
1997
pubmed:articleTitle
A 973 valine to methionine mutation of the human insulin receptor: interaction with insulin-receptor substrate-1 and Shc in HEK 293 cells.
pubmed:affiliation
Eberhard-Karls-Universität Tübingen, Innere Medizin IV, Germany.
pubmed:publicationType
Journal Article, Comparative Study