Stuart C. Feinstein

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The TrkB family of transmembrane proteins serve as receptors for brain-derived neurotrophic factor (BDNF), neurotrophin (NT)-4/5, and possibly NT-3, three members of the neurotrophin family of neurotrophic factors. In order to understand the potential roles played by these receptors, we have examined the distribution of the TrkB receptor proteins in the(More)
Nerve growth factor (NGF) regulates the microtubule-dependent extension and maintenance of axons by some peripheral neurons. We show here that one effect of NGF is to promote microtubule assembly during neurite outgrowth in PC12 cells. Though NGF causes an increase in total tubulin levels, the formation of neurites and the assembly of microtubules follow a(More)
The neurotrophins brain-derived neurotrophic factor (BDNF) and NT-4/5 exert their trophic effects on the nervous system via signaling through trkB receptors. These receptors occur as splice variants of the trkB gene that encodes a full-length receptor containing the signal transducing tyrosine kinase domain as well as truncated forms lacking this domain.(More)
Investigations into the biological actions of nerve growth factor (NGF) have shown that dorsal root ganglion (DRG) neurons subserving nociception require NGF for survival and maintenance of phenotype. This discovery suggests that the signaling NGF receptor, TrkA, can be used as a marker for nociceptive neurons. In this study, we have used antibodies to(More)
Tau is a developmentally regulated microtubule-associated protein that influences microtubule behavior by directly associating with tubulin. The carboxyl terminus of tau contains multiple 18-amino acid repeats that bind microtubules and are separated by 13-14-amino acid inter-repeat (IR) regions previously thought to function as "linkers." Here, we have(More)
The trkB family of transmembrane proteins serves as receptors for BDNF and NT-4/5. The family is composed of a tyrosine kinase-containing isoform as well as several alternatively spliced "truncated receptors" with identical extracellular ligand-binding domains but very small intracellular domains. The two best-characterized truncated trkB receptors,(More)
To investigate the role of neurotrophins in the initial formation of striatal patch versus matrix, the spatial and temporal expression of trkB receptors was examined using immunohistochemistry. Polyclonal antibodies, against the C-terminus or the tyrosine kinase domain, revealed trkB-immunoreactive cells and fibers localized to patches beginning on(More)
Pick's disease is characterized neuropathologically by distinct tau-immunoreactive intraneuronal inclusions known as Pick bodies and by insoluble tau proteins with predominantly three microtubule-binding repeat tau isoforms. However, recent immunohistochemical studies showed that the antibody specific for exon 10, which encodes the fourth(More)
The PC12 pheochromocytoma cell line has been a favorite model system for cell and neurobiologists, but has proven relatively refractory to standard DNA transfection methods. We have found that the cationic lipid "lipofectin" provides a simple, gentle, and nontoxic procedure that vastly improves transfection efficiencies in PC12 cells. Transient expression(More)
Tau is a neuronal microtubule-associated protein that promotes microtubule assembly, stability, and bundling in axons. Two distinct regions of tau are important for the tau-microtubule interaction, a relatively well-characterized "repeat region" in the carboxyl terminus (containing either three or four imperfect 18-amino acid repeats separated by 13- or(More)