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FEBS Lett. 1997 Nov 24;418(1-2):83-6.

Differential internalisation of mGluR1 splice variants in response to agonist and phorbol esters in permanently transfected BHK cells.

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  • 1Medical Research Council Anatomical Neuropharmacology Unit, Oxford, UK.


The internalisation of metabotropic glutamate receptor (mGluR1alpha) and its splice variant (mGluR1beta), in response to agonist and phorbol esters (PMA), has been studied. Both mGluR1alpha and mGluR1beta exhibit a similar rate of internalisation following PMA treatment, with a shift in their distribution from plasma membrane to endosome-enriched membrane fractions. Agonist challenge however caused a rapid loss, within 5-10 min, of mGluR1beta but not mGluR1alpha from the cell surface. These results show that the two forms of mGluR1 show different internalisation responses to agonist and suggest that the C-terminal region of the molecule plays an important role in this phenomenon.

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