Assignment of human nerve growth factor receptor gene to chromosome 17 and regulation of receptor expression in somatic cell hybrids

Nerve growth factor (NGF) is a polypeptide hormone which plays a central role in the development and growth of sympathetic and sensory neurons. The effects of NGF on target cells are mediated by a specific cell surface structure, nerve growth factor receptor (NGFr), which has been identified in human cells as a 75,000-mol-wt glycoprotein. We have used a monoclonal antibody to human NGFr to study cell-surface expression of the receptor on a panel of mouse-human neuroblastoma hybrids, and the serological typing results permit assignment of the gene coding for NGFr (NGFR) to chromosome 17q21-qter. In addition to mouse-human neuroblastoma hybrids, human NGFr was also detected on hybrids derived from fusions between mouse L-cell fibroblasts and human neuroblastoma and melanoma cells. Furthermore, induction of human NGFr expression was observed in hybrids derived from NGFr- human kidney epithelial cells and mouse L cells, but not in hybrids derived from human kidney epithelial cells and mouse RAG kidney carcinoma cells. These results suggest that cell-surface expression of human NGFr is controlled by trans-acting regulatory signals.