The function of Ensembl gene identifier ENSG00000101188 (NTSR1, neurotensin receptor 1) is as follows. G protein-coupled receptor for the tridecapeptide neurotensin (NTS) (PubMed:21725197, PubMed:23140271, PubMed:8381365). Signaling is effected via G proteins that activate a phosphatidylinositol-calcium second messenger system. Signaling leads to the activation of downstream MAP kinases and protects cells against apoptosis (PubMed:21725197). {ECO:0000269|PubMed:21725197, ECO:0000269|PubMed:23140271, ECO:0000269|PubMed:8381365}.