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. 1999 Feb 1;18(3):616–622. doi: 10.1093/emboj/18.3.616

Biochemical and functional interactions between the neurotrophin receptors trk and p75NTR.

M Bibel 1, E Hoppe 1, Y A Barde 1
PMCID: PMC1171154  PMID: 9927421

Abstract

Neurotrophins bind to two structurally unrelated receptors, the trk tyrosine kinases and the neurotrophin receptor p75(NTR). Ligand activation of these two types of receptor can lead to opposite actions, in particular the prevention or activation of programmed cell death. Many cells co-express trk receptors and p75(NTR), and we found that p75(NTR) was co-precipitated with trkA, trkB and trkC in cells transfected with both receptor types. Co-precipitation of p75(NTR) was not observed with the epidermal growth factor receptor. Experiments with deletion constructs of trkB (the most abundant trk receptor in the brain) and p75(NTR) revealed that both the extracellular and intracellular domains of trkB and p75(NTR) contribute to the interaction. Blocking autophosphorylation of trkB substantially reduced the interactions between p75(NTR) and trkB constructs containing the intracellular, but not the extracellular, domains. We also found that co-expression of p75(NTR) with trkB resulted in a clear increase in the specificity of trkB activation by brain-derived neurotrophic factor, compared with neurotrophin-3 and neurotrophin-4/5. These results indicate a close proximity of the two neurotrophin receptors within cell membranes, and suggest that the signalling pathways they initiate may interact soon after their activation.

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