Immunohistochemical analysis of paraffin-embedded human colon carcinoma using CD45RO (UCHL1) Mouse mAb (IHC Specific).
Immunohistochemical analysis of paraffin-embedded human tonsil using CD45RO (UCHL1) Mouse mAb (IHC Specific).
Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA, 50% glycerol and less than 0.02% sodium azide. Store at –20°C. Do not aliquot the antibody.
NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.
NOTE: Do not allow slides to dry at any time during this procedure.
For Citrate: Heat slides in a microwave submersed in 1X citrate unmasking solution until boiling is initiated; follow with 10 min at a sub-boiling temperature (95°-98°C). Cool slides on bench top for 30 min.
|SignalStain® Boost IHC Detection Reagent (HRP, Mouse) #8125||SignalStain® Boost IHC Detection Reagent (AP, Mouse) #31926|
|SignalStain® DAB Substrate Kit #8059||SignalStain® Vibrant Red Alkaline Phosphatase Substrate Kit #76713|
|SignalStain® Vivid Purple Peroxidase Substrate Kit #96632|
NOTE: Use of detection reagents other than those specified in this protocol may require further optimization of the primary antibody to account for the different sensitivities of the detection reagents.
posted February 2010
revised June 2020
Protocol Id: 280
CD45RO (UCHL1) Mouse mAb (IHC Specific) recognizes endogenous levels of total CD45RO protein.
Monoclonal antibody is produced by immunizing animals with the IL-2-dependent T cell line, CA1 (5).
The protein phosphatase (PTP) receptor CD45 is a type I transmembrane protein comprised of a pair of intracellular tyrosine phosphatase domains and a variable extracellular domain generated by alternative splicing (1). The catalytic activity of CD45 is a function of the first phosphatase domain (D1) while the second phosphatase domain (D2) may interact with and stabilize the first domain, or recruit/bind substrates (2,3). CD45 interacts directly with antigen receptor complex proteins or activates Src family kinases involved in the regulation of T- and B-cell antigen receptor signaling (1). Specifically, CD45 dephosphorylates Src-family kinases Lck and Fyn at their conserved negative regulatory carboxy-terminal tyrosine residues and upregulates kinase activity. Conversely, studies indicate that CD45 can also inhibit Lck and Fyn by dephosphorylating their positive regulatory autophosphorylation site. CD45 appears to be both a positive and a negative regulator that conducts signals depending on specific stimuli and cell type (1). Human leukocytes including lymphocytes, eosinophils, monocytes, basophils, and neutrophils express CD45, while erythrocytes and platelets are negative for CD45 expression (4).
Several isoforms of CD45 are generated through alternative splicing in a cell type-specific and activation state-specific manner. Memory T cells are positive for CD45RO, while naive T cells are negative for CD45RO (5).
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