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REACTIVITY SENSITIVITY MW (kDa) Isotype
Mouse 

Product Usage Information

Storage: Supplied in PBS (pH 7.2), less than 0.1% sodium azide and 2 mg/ml BSA. Store at 4°C. Do not aliquot the antibody. Protect from light. Do not freeze.

Specificity / Sensitivity

CD44 (156-3C11) Mouse mAb (Alexa Fluor® 488 Conjugate) detects endogenous levels of total CD44 protein.


Source / Purification

Monoclonal antibody is produced by immunizing BALB/c mice with stimulated human leukocytes. The antibody was conjugated to Alexa Fluor® 488 under optimal conditions with an F/P ratio of 2-5.

Product Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 488 fluorescent dye and tested in-house for direct flow cytometry and immunofluorescent analysis in human cells.


CD44 is a type I transmembrane glycoprotein that mediates cell-cell and cell-matrix interaction through its affinity for hyaluronic acid (HA) and possibly through other parts of the extracellular matrix (ECM). CD44 is highly polymorphic, possesses a number of alternative splice variants and undergoes extensive post-translational modifications (1,2). Increased surface levels of CD44 are characteristic of T cell activation, and expression of the protein is upregulated during the inflammatory response. Research studies have shown that interactions between CD44 and HER2 are linked to an increase in ovarian carcinoma cell growth (1-3). CD44 interacts with ezrin, radixin and moesin (ERM), linking the actin cytoskeleton to the plasma membrane and the ECM (4-6). CD44 is constitutively phosphorylated at Ser325 in resting cells. Activation of PKC results in phosphorylation of Ser291, dephosphorylation of Ser325, disassociation of ezrin from CD44, and directional motility (4).


1.  Goodison, S. et al. (1999) Mol. Pathol. 52, 189-196.

2.  Cichy, J. and Puré, E. (2003) J. Cell Biol. 161, 839-843.

3.  Bourguignon, L.Y. et al. (1997) J. Biol. Chem. 272, 27913-27918.

4.  Legg, J.W. et al. (2002) Nat. Cell Biol. 4, 399-407.

5.  Yonemura, S. et al. (1998) J. Cell Biol. 140, 885-895.

6.  Tsukita, S. et al. (1994) J. Cell Biol. 126, 391-401.


Entrez-Gene Id 960
Swiss-Prot Acc. P16070


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
DRAQ5® is a registered trademark of Biostatus Limited.
The Alexa Fluor® dye antibody conjugates in this product are sold under license from Life Technologies Corporation for research use only, except for use in combination with DNA microarrays. The Alexa Fluor® dyes (except for Alexa Fluor® 430 dye) are covered by pending and issued patents. Alexa Fluor® is a registered trademark of Molecular Probes, Inc.