Influence of annexin A7 on Insulin Sensitivity

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dc.contributor.advisor Lang, Florian (Prof. Dr.) Luo, Dong 2015-01-22T10:19:48Z 2015-01-22T10:19:48Z 2015-01-22
dc.identifier.other 425400093 de_DE
dc.identifier.uri de_DE
dc.description.abstract Background: Insulin sensitivity is impaired by PGE2, a major product of cyclooxygenase-2 (COX-2), which thus interferes with cellular glucose uptake following a glucose load. As shown in erythrocytes, PGE2 formation is inhibited by annexin A7. The present study defined the role of annexin A7 in glucose metabolism. Methods: Gene-targeted mice lacking annexin A7 (annexinA7-/-) were compared to wild type mice (annexinA7+/+). 6-Keto-prostaglandin-F1α (6-Keto-PGF1α) was determined by ELISA to estimate COX-2 activity in serum. Hepatic COX activity was determined by an ELISA assay. Glucose and insulin serum concentrations were determined following an intraperitoneal glucose load and glucose serum levels after intraperitoneal injection of insulin. Experiments were done without and with pretreatment of the mice with COX inhibitor aspirin. Results: The serum 6-Keto-PGF1α level and hepatic COX activity were significantly higher in annexinA7-/- than in annexinA7+/+ mice. The intraperitoneal glucose tolerance test revealed decreased glucose tolerance in annexinA7-/- mice compared to annexinA7+/+ mice. Intraperitoneal insulin injection decreased the serum glucose level in both genotypes, an effect significantly less pronounced in annexinA7-/- than in annexinA7+/+ mice. Intraperitoneal glucose administration resulted in higher serum insulin concentrations in annexinA7-/- than in annexinA7+/+ mice. Aspirin pretreatment lowered the increase in insulin concentration following glucose injection in both genotypes and virtually abrogated the differences in serum insulin between the genotypes. Moreover, aspirin pretreatment improved glucose tolerance in annexinA7-/- mice. Conclusions: Annexin A7 influences insulin sensitivity of cellular glucose uptake and thus glucose tolerance. These effects depend on COX activity. en
dc.language.iso en de_DE
dc.publisher Universität Tübingen de_DE
dc.subject.classification Glucose , Insulin , Prostaglandinsynthase , Annexin VII , Acetylsalicylsäure de_DE
dc.subject.ddc 610 de_DE
dc.subject.other cycloxygenase en
dc.subject.other Aspirin de_DE
dc.subject.other Annexin A7 de_DE
dc.subject.other Cyclooxygenase de_DE
dc.subject.other Glukose de_DE
dc.title Influence of annexin A7 on Insulin Sensitivity en
dc.type Dissertation de_DE
dcterms.dateAccepted 2014-12-15
utue.publikation.fachbereich Medizinische Fakultät de_DE
utue.publikation.fakultaet 4 Medizinische Fakultät de_DE


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