Rat GDF15 (Growth Differentiation Factor 15) ELISA (Small Sample Volume)

The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Rat GDF15. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Rat GDF15. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Rat GDF15, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Rat GDF15 in the samples is then determined by comparing the OD of the samples to the standard curve. Protein Function: Hormone produced in response to various stresses to confer information about those stresses to the brain, and trigger an aversive response, characterized by nausea and/or loss of appetite (PubMed:28846099, PubMed:28953886, PubMed:31928886, PubMed:34187898, PubMed:37060902). The aversive response is both required to reduce continuing exposure to those stresses at the time of exposure and to promote avoidance behavior in the future (By similarity). Acts by binding to its receptor, GFRAL, activating GFRAL-expressing neurons localized in the area postrema and nucleus tractus solitarius of the brainstem (PubMed:28846099, PubMed:28953886, PubMed:37060902). It then triggers the activation of neurons localized within the parabrachial nucleus and central amygdala, which constitutes part of the 'emergency circuit' that shapes responses to stressful conditions (PubMed:37060902). The GDF15-GFRAL signal induces expression of genes involved in metabolism, such as lipid metabolism in adipose tissues (By similarity). Contributes to the effect of metformin, an anti-diabetic drug, on appetite reduction and weight loss: produced in the kidney in response to metformin treatment, thereby activating the GDF15-GFRAL response, leading to reduced appetite and weight (PubMed:37060902). Required for avoidance behavior in response to food allergens: induced downstream of mast cell activation to promote aversion and minimize harmful effects of exposure to noxious substances (By similarity). Produced in response to anticancer drugs, such as camptothecin or cisplatin, promoting nausea and contributing to malnutrition (By similarity). Overproduced in many cancers, promoting anorexia in cancer (cachexia) (By similarity). Responsible for the risk of nausea during pregnancy: high levels of GDF15 during pregnancy, mostly originating from embryos, are associated with increased nausea (By similarity). Maternal sensitivity to nausea is probably determined by pre-pregnancy exposure to GDF15, females with naturally high level of GDF15 being less susceptible to nausea than female rats with low levels of GDF15 before pregnancy (By similarity). Promotes metabolic adaptation in response to systemic inflammation caused by bacterial and viral infections in order to promote tissue tolerance and prevent tissue damage (By similarity). Required for tissue tolerance in response to myocardial infarction by acting as an inhibitor of leukocyte integring activation, thereby protecting against cardiac rupture (By similarity). Inhibits growth hormone signaling on hepatocytes (By similarity) [The Uniprot Consortium]