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The migration of membrane receptors upon exposure to different stimulants/inhibitors is of great importance. Among others, the internalization of membrane receptors affects their accessibility to ligands and cell responsiveness to environmental cues. Experimentally, receptor internalization can be used as a measure of their activation. In our studies, we employed this approach to explore cross-talk between a seven transmembrane domain receptor for neuropeptide Y (NPY), Y5R, and a tyrosine kinase receptor for brain-derived neurotrophic factor (BDNF), TrkB. To this end, we measured the internalization of Y5R upon stimulation with the TrkB ligand, BDNF. Upon treatment with BDNF, the cells were exposed to a membrane impermeable, biotinylation reagent that selectively labels surface proteins. Subsequently, the biotinylated membrane proteins were affinity-purified on columns with avidin resins and analyzed by Western blot. Differences in the fraction of receptors present on the cell surface of control and ligand-treated cells served as a measure of their internalization and response to particular stimuli.

Cell Surface Protein Detection to Assess Receptor Internalization