BD, 554228, Purified Mouse Anti-Human p21 6B6

p21 belongs to a class of tumor suppressors including p16 and p27 which control progression through the cell cycle by inhibiting the activity of cyclin-cdk complexes. p21 is also known as senescent cell-derived inhibitor 1 (Sdi1), wild-type p53-activated fragment 1 (Waf1), Cdk-interacting protein 1 (Cip1), p21 and p53-regulated inhibitor of Cdks (Pic1). p21 mRNA is expressed at higher levels in senescent fibroblasts than in actively growing cells. When introduced into proliferating foreskin fibroblasts, p21 inhibits DNA synthesis and cell cycle arrest. p53 can activate p21 gene expression via a p53 binding site identified in the promoter of the p21 gene.
Applications include immunoprecipitation (1-2 µg/1x106 cells), western blot analysis (1-2 µg/ml) and immunohistochemistry of paraformaldehyde-fixed cultured cells (0.5-2.5 µg/ml) and acetone-fixed, frozen and formalin-fixed paraffin-embedded (10 µg/ml) tissue sections. MCF7 human breast carcinoma cells (ATCC HTB-22) are suggested as a positive control. WI-38 human lung fibroblasts (ATCC CCL-75) treated with doxorubin (Adriamycin) can also be used as a positive control.
The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. Store undiluted at 4°C.
1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
2. Please refer to www.bdbiosciences.com/us/s/resources for technical protocols.
3. Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.