Host Species: Mouse
Clonality: Monoclonal (Clone #738710)
Target: Human IRS1 phosphorylated at S616
Applications: Western blotting, immunoblotting
Validation: Tested in MCF-7 cells treated with insulin and CIP, showing a specific band at ~150 kDa under reducing conditions .
Host Species: Rabbit
Target: Human IRS1 phosphorylated at S616
Applications: Western blotting, immunohistochemistry (previous lots)
Validation: Used in 293T cells transfected with IRS1 and treated with TPA .
Preadsorption: Negatively preadsorbed to remove reactivity with non-phosphorylated IRS1 .
| Feature | R&D Systems MAB39783 | Thermo Fisher 44-550G |
|---|---|---|
| Host | Mouse | Rabbit |
| Clonality | Monoclonal | Polyclonal |
| Species Reactivity | Human, mouse, rat | Human |
| Applications | Western blot | Western blot, IHC |
| Preadsorption | Not specified | Yes |
IRS1 is a 150–180 kDa substrate of insulin/IGF-I receptors, mediating downstream signaling via PI-3 kinase and GRB2 . Phosphorylation at S616 is induced by insulin/IGF-I and angiotensin II, and is associated with insulin resistance .
S6K1 Kinase: The mTOR/S6K1 pathway directly phosphorylates IRS1 at S616 in vitro, promoting its depletion from specific intracellular pools .
Pathological Role: S616 phosphorylation correlates with IRS1 degradation in tuberous sclerosis complex (TSC) models, contributing to insulin resistance .
Sample Preparation: Use lysates from insulin/IGF-I-stimulated cells (e.g., MCF-7, 293T).
Optimization: Dilute antibody to 1 µg/mL (R&D Systems) or as recommended (Thermo Fisher).
Running Conditions: SDS-PAGE under reducing conditions for R&D Systems; exact conditions vary by protocol .
S616 phosphorylation is a biomarker for insulin resistance in diseases like type 2 diabetes and TSC . Antibodies targeting this site enable quantitative assessment of IRS1 dysfunction, aiding in mechanistic studies and therapeutic development (e.g., mTOR inhibitors) .
This antibody is a critical tool for elucidating IRS1 signaling dynamics, with applications spanning basic research to translational medicine. Its specificity and validation across diverse models underscore its utility in advancing diabetes and metabolism research.
Applications : Immunohistochemical staining
Sample type: tissue
Review: Effects of n3-PUFAs (n-3, 300 mg/kg) and metformin (Met, 150 mg/kg) on relative hepatic tissue expression of insulin receptor substrate 1 (IRS-1) and phosphorylated insulin receptor substrate 1 (p-IRS1Ser 616) in high-fat diet/low dose streptozotocin (HFD-STZ)-induced NAFLD in rats by immunohistochemistry. (×400, scale bar = 50um).