Targeting the cis-dimerization of LINGO-1 with low MW compounds affects its downstream signalling
Identifieur interne : 000075 ( France/Analysis ); précédent : 000074; suivant : 000076Targeting the cis-dimerization of LINGO-1 with low MW compounds affects its downstream signalling
Auteurs : L. Cobret [France] ; M L De Tauzia [France] ; J. Ferent [Canada] ; E. Traiffort [France] ; I. Hénaoui [France] ; F. Godin [France] ; E. Kellenberger [France] ; D. Rognan [France] ; J. Pantel [France] ; H. Bénédetti [France] ; S. Morisset-Lopez [France]Source :
- British Journal of Pharmacology [ 0007-1188 ] ; 2014.
Abstract
The transmembrane protein LINGO-1 is a negative regulator in the nervous system mainly affecting axonal regeneration, neuronal survival, oligodendrocyte differentiation and myelination. However, the molecular mechanisms regulating its functions are poorly understood. In the present study, we investigated the formation and the role of LINGO-1
LINGO-1 homodimers were identified in both HEK293 and SH-SY5Y cells using co-immunoprecipitation experiments and BRET saturation analysis. We performed a hypothesis-driven screen for identification of small-molecule protein–protein interaction modulators of LINGO-1 using a BRET-based assay, adapted for screening. The compound identified was further assessed for effects on LINGO-1 downstream signalling pathways using Western blotting analysis and AlphaScreen technology.
LINGO-1 was present as homodimers in primary neuronal cultures. LINGO-1 interacted homotypically in
Our data suggest that LINGO-1 forms constitutive
Url:
DOI: 10.1111/bph.12945
PubMed: 25257685
PubMed Central: 4301693
Affiliations:
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PMC:4301693Le document en format XML
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-dimerization of LINGO-1 with low MW compounds affects its downstream signalling</title>
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<front><div type="abstract" xml:lang="en"><sec><title>Background and Purpose</title>
<p>The transmembrane protein LINGO-1 is a negative regulator in the nervous system mainly affecting axonal regeneration, neuronal survival, oligodendrocyte differentiation and myelination. However, the molecular mechanisms regulating its functions are poorly understood. In the present study, we investigated the formation and the role of LINGO-1 <italic>cis</italic>
-dimers in the regulation of its biological activity.</p>
</sec>
<sec><title>Experimental Approach</title>
<p>LINGO-1 homodimers were identified in both HEK293 and SH-SY5Y cells using co-immunoprecipitation experiments and BRET saturation analysis. We performed a hypothesis-driven screen for identification of small-molecule protein–protein interaction modulators of LINGO-1 using a BRET-based assay, adapted for screening. The compound identified was further assessed for effects on LINGO-1 downstream signalling pathways using Western blotting analysis and AlphaScreen technology.</p>
</sec>
<sec><title>Key Results</title>
<p>LINGO-1 was present as homodimers in primary neuronal cultures. LINGO-1 interacted homotypically in <italic>cis</italic>
-orientation and LINGO-1 <italic>cis-</italic>
dimers were formed early during LINGO-1 biosynthesis. A BRET-based assay allowed us to identify phenoxybenzamine as the first conformational modulator of LINGO-1 dimers. In HEK-293 cells, phenoxybenzamine was a positive modulator of LINGO-1 function, increasing the LINGO-1-mediated inhibition of EGF receptor signalling and Erk phosphorylation.</p>
</sec>
<sec><title>Conclusions and Implications</title>
<p>Our data suggest that LINGO-1 forms constitutive <italic>cis</italic>
-dimers at the plasma membrane and that low MW compounds affecting the conformational state of these dimers can regulate LINGO-1 downstream signalling pathways. We propose that targeting the LINGO-1 dimerization interface opens a new pharmacological approach to the modulation of its function and provides a new strategy for drug discovery.</p>
</sec>
</div>
</front>
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