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An agonistic mAb directed to the TrkC receptor juxtamembrane region defines a trophic hot spot and interactions with p75 coreceptors
Author(s) -
Guillemard Veronique,
Ivanisevic Ljubica,
Garcia Alba Galan,
Scholten Vicki,
Lazo Oscar M.,
Bronfman Francisca C.,
Saragovi H. Uri
Publication year - 2010
Publication title -
developmental neurobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.716
H-Index - 129
eISSN - 1932-846X
pISSN - 1932-8451
DOI - 10.1002/dneu.20776
Subject(s) - tropomyosin receptor kinase c , biology , receptor , microbiology and biotechnology , neurotrophin 3 , agonist , biochemistry , growth factor , brain derived neurotrophic factor , platelet derived growth factor receptor , neurotrophic factors
The D5 domain of TrkC receptors is a docking site for Neurotrophin‐3 (NT‐3), but other domains may be relevant for function or harmonizing signals with p75 NTR coreceptors. We report a monoclonal antibody (mAb) 2B7 targeting the juxtamembrane domain of TrkC. mAb 2B7 binds to murine and human TrkC receptors and is a functional agonist that affords activation of TrkC, AKT, and MAPK. These signals result in cell survival but not in cellular differentiation. Monomeric 2B7 Fabs also affords cell survival. Binding of 2B7 mAb and 2B7 Fabs to TrkC are blocked by NT‐3 in a dose‐dependent manner but not by pro‐NT‐3. Expression of p75 NTR coreceptors on the cell surface block the binding and function of mAb 2B7, whereas NT‐3 binding and function are enhanced. mAb 2B7 defines a previously unknown neurotrophin receptor functional hot spot; that exclusively generates survival signals; that can be activated by non‐dimeric ligands; and potentially unmasks a site for p75‐TrkC interactions. © 2009 Wiley Periodicals, Inc. Develop Neurobiol, 2010.