Cell Signaling Technology

Product Pathways - Neuroscience

Phospho-TrkA (Tyr490)/TrkB (Tyr516) (C35G9) Rabbit mAb #4619

Applications Reactivity MW (kDa) Source Isotype
W IP H R (M) 140 Rabbit IgG

Applications Key:  W=Western Blotting  IP=Immunoprecipitation
Reactivity Key:  H=Human  M=Mouse  R=Rat
Species enclosed in parentheses are predicted to react based on 100% sequence homology. Species cross-reactivity is determined by Western blot.

Specificity / Sensitivity

Phospho-TrkA (Tyr490)/TrkB (Tyr516) (C35G9) Rabbit mAb detects endogenous levels of TrkA and TrkB only when phosphorylated at Tyr490 and Tyr516, respectively. This antibody may cross-react with Bcr-Abl phosphorylated at an unkown tyrosine residue.

Source / Purification

Monoclonal antibody is produced by immunizing rabbits with a synthetic phosphopeptide (KLH-coupled) corresponding to residues surrounding Tyr490 of human TrkA.

Western Blotting

Western Blotting

Western blot analysis of extracts from NIH/3T3 cells stably transfected with either TrkA or TrkB, left untreated or treated with NGF or BDNF, respectively, using Phospho-TrkA (Tyr490)/TrkB (Tyr516) (C35G9) Rabbit mAb (upper) and pooled TrkA/TrkB antibodies (lower).

Western Blotting

Western Blotting

Western blot analysis of extracts from untreated or NGF-treated 3T3/TrkA and PC12 cells using Phospho-TrkA (Tyr490)/TrkB (Tyr516) (C35G9) Rabbit mAb.

Background

The family of Trk receptor tyrosine kinases consists of TrkA, TrkB and TrkC. While the sequence of these family members is highly conserved, these family members are activated by different neurotrophins: TrkA by NGF, TrkB by BDNF or NT4 and TrkC by NT3. TrkA regulates proliferation and is important for development and maturation of the nervous system (1). Phosphorylation at Tyr490 is required for Shc association and activation of the Ras-MAP kinase cascade. Residues Tyr674/675 lie within the catalytic domain, and phosphorylation at this site reflects TrkA kinase activity (2-6). Point mutations, deletions and chromosomal rearrangements (chimera) cause ligand-independent receptor dimerization and activation of TrkA. Many malignancies (breast, colon, prostate and thyroid carcinomas and acute myeloid leukemia) have activated TrkA. Expression of TrkA in neuroblastomas is a good prognostic marker because it signals growth arrest and differentiation of cells originating from the neural crest (1).

The phosphorylation sites are conserved between TrkA and TrkB: Tyr490 of TrkA corresponds to Tyr512 in TrkB, and Tyr674/675 of TrkA to Tyr706/707 in TrkB of the human sequence (7). TrkB is overexpressed in tumors such as neuroblastoma, prostate adenocarcinoma and pancreatic ductal adenocarcinoma. In neuroblastomas overexpression of TrkB correlates with unfavorable disease outcome when autocrine loops signaling tumor survival are potentiated by additional overexpression of brain-derived neurotrophic factor (BDNF). An alternatively spliced truncated TrkB isoform lacking the kinase domain is overexpressed in Wilms’s tumors and this isoform may act as a dominant-negative to TrkB signaling (8).

  1. Pierotti, M.A. and Greco, A. (2006) Cancer Lett. 232, 90-98.
  2. Segal, R.A. and Greenberg, M.E. (1996) Annu. Rev. Neurosci. 19, 463-489.
  3. Stephens, R.M. et al. (1994) Neuron 12, 691-705.
  4. Obermeier, A. et al. (1993) EMBO J. 12, 933-941.
  5. Obermeier, A. et al. (1994) EMBO J. 13, 1585-1590.
  6. Yao, R. and Cooper, G.M. (1995) Science 267, 2003-2006.
  7. Huang, E.J. and Reichardt, L.F. (2003) Annu. Rev. Biochem. 72, 609-42.
  8. Desmet, C.J. and Peeper, D.S. (2006) Cell Mol. Life Sci. 63, 755-9.

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