Adiponectin

Adiponectin is an adipocyte-secreted hormone, consisting of 244 amino acids with a molecular weight of approximately 30kDa (28-30kDa). It is one of the most abundant proteins in human blood, with circulating concentrations of 0.5-30 μl/mL, which accounts for approximately 0.01% of total plasma protein [1]. Adiponectin concentrations is reversely associated with type 2 diabetes, coronary artery disease and obesity, all together called the metabolic syndrome. Adiponectin decreases blood glucose and free fatty acid serum concentrations and increases insulin sensitivity [2]. Adiponectin has been shown to have anti-inflammatory effects [1]. However, recent studies indicate that Adiponectin may not be present in circulation as monomers or isolated globular forms, but rather in multimeric structures. The studies have shown that the dominant forms of Adiponectin that circulates in human blood are hexamers (LMW) and lager oligomers (HMW) [3,12-14]. The LMW Adiponectin levels does not seem to differ between insulin sensitive- and insulin resistant subjects, nor does LMW Adiponectin differ between men and women. The increased levels of total Adiponectin in insulin sensitive subjects and women were caused by increased amounts of HMW Adiponectin. Both total and HMW Adiponectin showed significant differences between the insulin sensitive- and insulin resistant subjects.

Catalog number
Product type ELISA
Quantity 96 Tests (12×8 breakable strip wells)
Standard range 3- µIU/mL
Analytical Sensitivity 3 µIU/mL
Sample volume 25 µI/well
Species Human

Application
The SDi Adiponectin ELISA kit is used for the quantitative measurement of Adiponectin in human serum or plasma.

Principle
The SDi Adiponectin ELISA is a solid phase sandwich enzyme immunoassay. Two monoclonal antibodies are directed against separate antigenic determinants on the Adiponectin molecule. During incubation, Adiponectin in the sample react with anti-Adiponectin antibodies bound to microwell plate wells and anti-Adiponectin antibodies bound to HRP. A simple washing step removes unbound enzyme labeled antibody. The bound conjugate is detected by reaction with 3,3’5,5′-tetramethylbenzidine (TMB). The reaction is stopped by adding acid to give a colorimetric endpoint that is red spectrophotometrically.

Storage and Stability
Product should be stored at 2-8 °C. Product is stable for 24 months from the date of manufacturing.

Precautions
For research use only. Not for use in diagnostic procedures.

References
1. Meier U and Gressner AM (2004) Endocrine Regulation of Energy metabolism: Review of Pathobiochemical and Clinical Aspects of Leptin, Ghrelin, Adiponectin, and Resistin. Clin Chem 50:1511-1525
2. Duntas LH, Popovic V and Panotopoulos G (2004) Adiponectin: Novelties in Metabolism and Hormonal Regulation. Nutr Neurosci 7:195-200
3. Lara Castro C, Luo N, Wallace P, Klein RL and Grvey T (2006) Adiponectin multimeric Complexes and the Metabolic Syndrome Trait Cluster. Diabetes 55:249-259