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SorCS3 is a member of the Vps10p-D receptor family. These type I transmembrane proteins are regarded as sorting receptors, and some family members modulate signal transduction pathways by acting as co-receptors. SorCS3 binds the nerve growth factor (NGF) and platelet-derived growth factor (PDGF-BB), but the functional implications of these interactions are poorly understood. Here we demonstrate that SorCS3 is almost exclusively expressed in the nervous system and is localized to vesicular structures. By using in situ hybridization, we analyze SorCS3 dynamic expression during embryonic and postnatal development and compare the expression pattern with those of the homologous genes SorCS1 and SorCS2. SorCS3 transcripts are widely distributed in the nervous system but are absent from the embryonic cerebral cortex. SorCS3 expression marks thalamic nuclei at embryonic and early postnatal stages. However, during postnatal development and in the adult, a switch in the localization of SorCS3 transcripts was observed. At these stages forebrain structures, such as the hippocampus and the cerebral cortex, show most prominent expression. The developmental expression pattern of SorCS3 is in accordance with the proposed function as a receptor for growth factors or morphogenic signals. On the cellular level, we demonstrate that the SorCS3 cytoplasmic domain targets receptors to the Golgi apparatus, vesicular structures, and the cell surface. In neurons, receptors are localized to vesicles in the soma and dendrites. Moreover, we show that the SorCS3 cytoplasmic domain conveys internalization through canonical endocytic motifs in an adaptor protein 2 (AP-2)-dependent way. This is in agreement with a proposed function as a neuronal sorting receptor.
Pubmed ID: 24715575 RIS Download
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