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Immunohistochemical analysis of paraffin-embedded human breast carcinoma using TrkA (14G6) Rabbit mAb #2508 in the presence of control peptide (left) or TrkA Blocking Peptide (right).

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Product Description

This peptide is used to block TrkA (14G6) Rabbit mAb #2508 reactivity in immunohistochemistry protocols.


Quality Control

The quality of the peptide was evaluated by reversed-phase HPLC and by mass spectrometry. The peptide blocks TrkA (14G6) Rabbit mAb #2508 by immunohistochemistry.

Product Usage Information

Use as a blocking reagent to evaluate the specificity of antibody reactivity in immunohistochemistry protocols. For immunohistochemistry, add twice the volume of peptide as volume of antibody used in 100 µl total volume. Incubate for a minimum of 30 minutes prior to adding the entire volume to the slide. Recommended antibody dilutions can be found on the relevant product data sheet.


Storage: Supplied in 20 mM potassium phosphate (pH 7.0), 50 mM NaCl, 0.1 mM EDTA, 1 mg/ml BSA and 5% glycerol. Store at –20°C.

The family of Trk receptor tyrosine kinases consists of TrkA, TrkB, and TrkC. While the sequence of these family members is highly conserved, they are activated by different neurotrophins: TrkA by NGF, TrkB by BDNF or NT4, and TrkC by NT3 (1). Neurotrophin signaling through these receptors regulates a number of physiological processes, such as cell survival, proliferation, neural development, and axon and dendrite growth and patterning (1). In the adult nervous system, the Trk receptors regulate synaptic strength and plasticity. TrkA regulates proliferation and is important for development and maturation of the nervous system (2). Phosphorylation at Tyr490 is required for Shc association and activation of the Ras-MAP kinase cascade (3,4). Residues Tyr674/675 lie within the catalytic domain, and phosphorylation at these sites reflects TrkA kinase activity (3-6). Point mutations, deletions, and chromosomal rearrangements (chimeras) cause ligand-independent receptor dimerization and activation of TrkA (7-10). TrkA is activated in many malignancies including breast, ovarian, prostate, and thyroid carcinomas (8-13). Research studies suggest that expression of TrkA in neuroblastomas may be a good prognostic marker as TrkA signals growth arrest and differentiation of cells originating from the neural crest (10).


1.  Huang, E.J. and Reichardt, L.F. (2003) Annu Rev Biochem 72, 609-42.

2.  Segal, R.A. and Greenberg, M.E. (1996) Annu Rev Neurosci 19, 463-89.

3.  Stephens, R.M. et al. (1994) Neuron 12, 691-705.

4.  Marsh, H.N. et al. (2003) J Cell Biol 163, 999-1010.

5.  Reuther, G. W. et al. (2000) Mol. Cell. Biol. 20, 8655-8666.

6.  Obermeier, A. et al. (1993) EMBO J 12, 933-41.

7.  Obermeier, A. et al. (1994) EMBO J 13, 1585-90.

8.  Arevalo, J.C. et al. (2001) Oncogene 20, 1229-34.

9.  Greco, A. et al. (1997) Genes Chromosomes Cancer 19, 112-23.

10.  Pierotti, M.A. and Greco, A. (2006) Cancer Lett 232, 90-8.

11.  Lagadec, C. et al. (2009) Oncogene 28, 1960-70.

12.  Greco, A. et al. (2010) Mol Cell Endocrinol 321, 44-9.

13.  Ødegaard, E. et al. (2007) Hum Pathol 38, 140-6.


Entrez-Gene Id 4914
Swiss-Prot Acc. P04629


For Research Use Only. Not For Use In Diagnostic Procedures.
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