Human/Mouse/Rat Phospho-GSK-3 alpha (S21) Antibody

Catalog # Availability Size / Price Qty
Detection of Human and Mouse Phospho-GSK‑3 alpha  (S21) by Western Blot.
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Product Details
Citations (1)
Supplemental Products

Human/Mouse/Rat Phospho-GSK-3 alpha (S21) Antibody Summary

Species Reactivity
Human, Mouse, Rat
Detects human, mouse, and rat GSK-3 alpha when phosphorylated at S21. This antibody does not detect phosphorylated GSK-3 beta.
Polyclonal Rabbit IgG
Antigen Affinity-purified
Phosphopeptide containing human, mouse, and rat GSK-3 alpha S21 site
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration
Western Blot
1 µg/mL
See below
5-15 µg/mL
See below

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Scientific Data

Western Blot Detection of Human and Mouse Phospho-GSK-3a (S21) antibody by Western Blot. View Larger

Detection of Human and Mouse Phospho-GSK‑3 alpha (S21) by Western Blot. Western blot shows lysates of HeLa human cervical epithelial carcinoma cell line untreated (-) or treated (+) with 200 nM PMA for 20 minutes and MCF-7 human breast cancer cell line untreated or treated with 100 ng/mL Recombinant Human IGF-1 (Catalog # 291-G1) for 15 minutes and NIH-3T3 mouse embryonic fibroblast cell line untreated or treated with 10 ng/mL PMA for 20 minutes. PVDF membrane was probed with 1 µg/mL of Human/Mouse/Rat Phospho-GSK-3a (S21) Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4125), followed by HRP-conjugated Anti-Rabbit IgG Secondary Antibody (Catalog # HAF008). A specific band was detected for Phospho-GSK-3a (S21) at approximately 51 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

Immunohistochemistry GSK‑3a antibody in Human Thymus by Immunohistochemistry (IHC-P). View Larger

GSK‑3 alpha in Human Thymus. GSK‑3a was detected in immersion fixed paraffin-embedded sections of human thymus using 5 µg/mL Human/Mouse/Rat Phospho-GSK‑3a (S21) Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4125) overnight at 4 °C. Before incubation with the primary antibody tissue was subjected to heat-induced epitope retrieval using Antigen Retrieval Reagent-Basic (Catalog # CTS013). Tissue was stained with the Anti-Rabbit HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS005) and counterstained with hematoxylin (blue). View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: GSK-3 alpha

Glycogen Synthase Kinase-3 (GSK-3) is a serine/threonine kinase initially identified as an inhibitor of glycogen synthase. Two isoforms (GSK-3 alpha and GSK-3 beta ) share 85% amino acid identity. GSK-3 alpha is inhibited by phosphorylation at S21 by Akt and other kinases. Deregulated GSK-3 has been implicated in several diseases including type II diabetes, Alzheimer’s disease, bipolar disorder, and cancer.

Long Name
Glycogen Synthase Kinase 3 alpha
Entrez Gene IDs
2931 (Human); 606496 (Mouse); 50686 (Rat)
Alternate Names
DKFZp686D0638; EC 2.7.11; EC; glycogen synthase kinase 3 alpha; glycogen synthase kinase-3 alpha; GSK3 alpha; GSK-3 alpha; GSK3A

Product Datasheets

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Citation for Human/Mouse/Rat Phospho-GSK-3 alpha (S21) Antibody

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

1 Citation: Showing 1 - 1

  1. Mechanism and management of AKT inhibitor-induced hyperglycemia.
    Authors: Crouthamel MC, Kahana JA, Korenchuk S, Zhang SY, Sundaresan G, Eberwein DJ, Brown KK, Kumar R
    Clin. Cancer Res., 2009;15(1):217-25.
    Species: Mouse
    Sample Types: Tissue Homogenates
    Applications: Western Blot


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