p53 Antibody Staining Protocol for Immunohistochemistry


Description: p53 is a DNA-binding, oligomerization domain- and transcription activation domain-containing tumor suppressor that upregulates growth arrest and apoptosis-related genes in response to stress signals, thereby influencing programmed cell death, cell differentiation, and cell cycle control mechanisms. p53 localizes to the nucleus yet can be chaperoned to the cytoplasm by the negative regulator MDM2, an E3 ubiquitin ligase that is upregulated in the presence of active p53, where MDM2 poly-ubiquitinates p53 for preteasome targeting. p53 can assemble into trtramers in the absence of DNA, fluctuates between latent and active (DNA-binding) conformations, and is differentially activated through post-translational modifications including phosphorylation and acetylation. Mutations in the DNA-binding domain (DBD) (amino acids 110-286) of p53 can compromise energetically favorable association with cis elements and are implicated in several human cancers.


Primary Antibody

Name: p53 Antibody

Clone: DO-7, Mouse anti-Human

Supplier: Dako

Catalog Number: M7001

Dilution: 1:100 using IHC-TekTM Antibody Diluent (Cat# IW-1000 or IW-1001) to reduce background and unspecific staining and serum blocking step is NOT needed.

Incubation Time/Temp: 60 min/room temperature

Antigen Retrieval
Device: IHC-TekTM Epitope Retrieval Steamer Set (Cat# IW-1102)
Buffer/pH value: IHC-TekTM Epitope Retrieval Solution (Cat# IW-1100)
Heat/Cool Temperature: 95-100 ºC/room temperature
Heat/Cool Time: 20 minutes/20 minutes

Detection Methods
Standard Method: ABC Method or LSAB Method
Enhanced Method: Polymeric Methods

Chromogen Substrate
Reagent: DAB
Incubation Time/Temperature: 1-3 minutes/room temperature

Reagent: Mayer's Hematoxylin
Staining Time: 30 seconds

Staining Pattern: Nuclear
Images: Search image

Additional Information:
Species Reactivity: Human, mouse, rat
Fixation: Formalin fixed paraffin sections
Positive Control: Skin cancer, tumors
Negative Control: Omit primary antibody, isotype control, absorption control
Blocking: 2-5% normal serum to reduce unspecific background staining; 0.5-3% H2O2 to block endogenous peroxidase activity; avidin/biotin to block endogenous biotin activity if necessary



1. Pillai G, Roberts H, Gatter K, Pezzella F (2003) p53 expression in normal paraffin-embedded tissue using different antibodies and antigen retrieval buffer systems. Histopathology. 42(1):83-7. PubMed Abstract


2. Shin HJ, Kalapurakal SK, Lee JJ, Ro JY, Hong WK, Lee JS (1997)Comparison of p53 immunoreactivity in fresh-cut versus stored slides with and without microwave heating. Mod Pathol. 10(3):224-30. PubMed Abstract