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Sixty per cent of the cells in the spinocervical tract responding monosynaptically to stimulation of peripheral myelinated fibers were found to respond also to stimulation of peripheral unmyelinated fibers. The length of discharge produced by un-myelinated fiber stimulation unlike that produced by myelinated fiber stimulation increased with each subsequent(More)
Three physiologically characterized spindle (group Ia) afferents were labeled by the intracellular injection of HRP and were processed for light-level reconstruction. Thirty-five boutons in the ventral horn were then selected for analysis. They were serially thin sectioned and characterized in terms of volume, total surface area and the surface area of(More)
1. Intracellular recordings were made in the somata of dorsal root ganglion cells in the L7 or S1 DRG in cats anesthetized with alpha-chloralose. The properties of the action potentials (amplitude, duration, peak rate of rise), duration of afterhyperpolarization (AHP), magnitude of inward rectification, and axonal conduction velocity were measured. The(More)
1. Intracellular recordings were made in situ from physiologically identified dorsal root ganglion (DRG) cells in untreated rats aged 5-8 wk and in rats treated from birth to 5 wk of age with nerve growth factor (NGF) or antisera against NGF (anti-NGF). 2. As demonstrated in cats, the shape of the somal action potential (AP) of DRG cells of normal rats is(More)
Nerve growth factor (NGF) is thought of as a target-derived factor responsible for the survival and maintaining the phenotype of specific sets of peripheral and central neurons during development and maturation. Recently, using physiological techniques, we have shown that specific functional types of nociceptive sensory neurons require NGF, first for(More)
Mechanisms underlying the hyperalgesia induced by a single systemic injection of nerve growth factor (NGF) in adult rats were studied in vivo. A single dose of NGF initiated a prolonged thermal hyperalgesia to a radiant heat source within minutes that lasted for days. Animals which had been pretreated with the mast cell degranulating compound 48/80 or(More)
We investigated the acute effects of bath applied BDNF on synaptic input to motoneurons in the hemisected spinal cord of the neonatal rat. Motoneurons were recorded intracellularly, and BDNF-induced modulation of the synaptic response to stimulation of the homologous dorsal root (DR) and the ventrolateral funiculus (VLF) was examined. All motoneurons(More)
1. The isolated neonatal rat spinal chord preparation was used to investigate the development of segmental afferent input to lumbar motoneourons during the first nine postnatal days. Motoneurons, identified with the use of antidromic stimulation of the ventral roots, were characterized electrophysiologically, and their synaptic input in response to(More)
Recently, we have shown that the interaction between NGF and sensory neurons in early postnatal periods is restricted to nociceptive afferents (Ritter et al., 1991; Lewin et al., 1992a; Ritter and Mendell, 1992). Here we show that administration of excess NGF to neonatal or mature animals can lead to a profound behavioral hyperalgesia. Neonatal NGF(More)