Adiponectin Mouse ELISA
Adiponectin, also referred to as Acrp30, AdipoQ and GBP-28, is a recently discovered 244 aminoacid protein, the product of the apM1 gene, which is physiologically active and specifically and highly expressed in adipose cells (adipokine). The protein belongs to the soluble defence collagen superfamily; it has a collagen-like domain structurally homologous with collagen VIII and X and complement factor C1q-like globular domain. Adiponectin forms homotrimers, which are the building blocks for higher order complexes found circulating in serum. Adiponectin receptors AdipoR1 and AdipoR2 have been recently cloned; AdipoR1 is abundantly expressed in skeletal muscle, whereas AdipoR2 is predominantly expressed in the liver. Paradoxically, adipose tissue-expressed adiponectin levels are inversely related to the degree of adiposity. A reduction in adiponectin serum levels is accompanied by insulin resistance states, such as obesity and type 2 diabetes mellitus. It is also reported in patients with coronary artery disease. Increased adiponectin levels are associated with type 1 diabetes mellitus, anorexia nervosa and chronic renal failure. Adiponectin concentrations correlate negatively with glucose, insulin, triglyceride concentrations and body mass index and positively with highdensity lipoprotein-cholesterol levels and insulin-stimulated glucose disposal. Adiponectin has been shown to increase insulin sensitivity and decrease plasma glucose by increasing tissue fat oxidation. It inhibits the inflammatory processes of atherosclerosis suppressing the expression of adhesion and cytokine molecules in vascular endothelial cells and macrophages, respectively. This adipokine plays a role as a scaffold of newly formed collagen in myocardial remodelling after ischaemic injury and also stimulates angiogenesis by promoting cross-talk between AMP-activated protein kinase and Akt signalling in endothelial cells.
INTENDED USE
The RD293023100R Mouse Adiponectin ELISA is a sandwich enzyme immunoassay for the quantitative measurement of mouse adiponectin.
Features
- It is intended for research use only
- The total assay time is less than 3.5 hours
- The kit measures total mouse adiponectin in serum
- Assay format is 96 wells
- Quality Controls are mouse serum based
- Standard is recombinant protein based
- Components of the kit are provided ready to use, concentrated or lyophilized
STORAGE, EXPIRATION
Store the complete kit at 2-8°C. Under these conditions, the kit is stable until the expiration date (see label on the box).
Clinical Application
- Energy metabolism and weight regulation
- Coronary artery disease
- Chronic renal failure
TEST PRINCIPLE
In the BioVendor Mouse Adiponectin ELISA, standards, quality controls and samples are incubated in microplate wells pre-coated with monoclonal anti-mouse adiponectin antibody. After 60 minutes incubation and washing, biotin labelled polyclonal anti-mouse adiponectin antibody is added and incubated at RT with captured mouse adiponectin for 60 minutes. After another washing, streptavidin-HRP conjugate is added. After 30 minutes incubation at RT and the last washing step, the remaining conjugate is allowed to react with the substrate solution (TMB). The reaction is stopped by addition of acidic solution and absorbance of the resulting yellow product is measured. The absorbance is proportional to the concentration of mouse adiponectin. A standard curve is constructed by plotting absorbance values against concentrations of standards, and concentrations of unknown samples are determined using this standard curve.
ASSAY PROCEDURE
- Pipet 100 μl of each individual concentration of Standards, Quality Controls, Dilution Buffer (=Blank) and diluted samples, preferably in duplicates, into the appropriate wells. See Figure 1 for example of work sheet.
- Incubate the plate at room temperature (ca. 25°C) for 1 hour, shaking at ca. 300 rpm on an orbital microplate shaker.
- Wash the wells 3-times with Wash Solution (0.35 ml per well). After final wash, invert and tap the plate strongly against paper towel.
- Add 100 μl of Biotin Labelled Antibody solution into each well.
- Incubate the plate at room temperature (ca. 25°C) for 1 hour, shaking at ca. 300 rpm on an orbital microplate shaker.
- Wash the wells 3-times with Wash Solution (0.35 ml per well). After final wash, invert and tap the plate strongly against paper towel.
- Add 100 μl of Streptavidin-HRP Conjugate into each well.
- Incubate the plate at room temperature (ca. 25°C) for 30 minutes, shaking at ca. 300 rpm on an orbital microplate shaker.
- Wash the wells 3-times with Wash Solution (0.35 ml per well). After final wash, invert and tap the plate strongly against paper towel.
- Add 100 μl of Substrate Solution into each well. Avoid exposing the microtiter plate to direct sunlight. Covering the plate with e.g. aluminium foil is recommended.
- Incubate the plate for 10 minutes at room temperature. The incubation time may be extended [up to 20 minutes] if the reaction temperature is below than 20°C. Do not shake the plate during the incubation.
- Stop the colour development by adding 100 μl of Stop Solution.
- Determine the absorbance of each well using a microplate reader set to 450 nm, preferably with the reference wavelength set to 630 nm (acceptable range: 550 – 650 nm). Subtract readings at 630 nm (550 – 650 nm) from the readings at 450 nm. The absorbance should be read within 5 minutes following step 12.
Note: If some samples and standard/s have absorbances above the upper limit of your microplate reader, perform a second reading at 405 nm. A new standard curve, constructed using the values measured at 405 nm, is used to determine mouse adiponectin concentration of off-scale standards and samples. The readings at 405 nm should not replace the readings for samples that were “in range” at 450 nm.
Note 2: Manual washing: Aspirate wells and pipet 0.35 ml Wash Solution into each well. Aspirate wells and repeat twice. After final wash, invert and tap the plate strongly against paper towel. Make certain that Wash Solution has been removed entirely.
– Adams AC, Yang C, Coskun T, Cheng CC, Gimeno RE, Luo Y, Kharitonenkov A. The breadth of FGF21’s metabolic actions are governed by FGFR1 in adipose tissue. Mol Metab. 2012;2 (1):31-7
– Berner HS, Lyngstadaas SP, Spahr A, Monjo M, Thommesen L, Drevon CA, Syversen U, Reseland JE. Adiponectin and its receptors are expressed in bone-forming cells. Bone . Oct;35(4):842-9 (2004)
– Giri S, Rattan R, Hag E, Khan M, Yasmin R, Won JS, Key L, Singh AK, Singh I. AICAR inhibits adipocyte differentiation in 3T3L1 and restores metabolic alterations in diet-induced obesity mice model. Nutr Metab (Lond) . Aug 10;3:31 (2006)
– Hennige AM, Staiger H, Wicke C, Machicao F, Fritsche A, Haring HU, Stefan N. Fetuin-A induces cytokine expression and suppresses adiponectin production. PLoS ONE. 2008;3 (3):e1765
– Lang P, van Harmelen V, Ryden M, Kaaman M, Parini P, Carneheim C, Cassady AI, Hume DA, Andersson G, Arner P. Monomeric tartrate resistant acid phosphatase induces insulin sensitive obesity. PLoS One. 2008;3 (3):e1713
– Sainz N, Rodriguez A, Catalan V, Becerril S, Ramirez B, Gomez-Ambrosi J, Fruhbeck G. Leptin administration downregulates the increased expression levels of genes related to oxidative stress and inflammation in the skeletal muscle of ob/ob mice. Mediators Inflamm. 2010;2010:784343
– Shimizu T, Yamakuchi M, Biswas KK, Aryal B, Yamada S, Hashiguchi T, Maruyama I. HMGB1 is secreted by 3T3-L1 adipocytes through JNK signaling and the secretion is partially inhibited by adiponectin. Obesity (Silver Spring). 2016 Jul 19;