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The present studies on electrophysiological and pharmacological differences of the three types of Ca-currents (N-, L- and T-types) in whole-cell clamped, cultured embryonic chick sensory neurons revealed that the majority (94%) of the Ca-currents in the nerve cells were the N-type, omega-Conotoxin (omega CTX, 5 microM), a blocker of transmitter release at(More)
A single-channel recording of the transient outward current (A-current) was obtained from dorsal root ganglion cells in culture using patch-clamp techniques. Depolarization of the membrane patch elicited pulse like current of a uniform amplitude in an outward direction, of which the unitary conductance was 20 pS. Alteration of extracellular ionic(More)
To study the roles of nitric oxide (NO) in growth of nerve fibers, (+/-)-(E)-ethyl-2-[(E)-hydroxyimino]-5-nitro-3-hexeneamine (NOR3), an NO-donor, was applied to cultured dorsal root ganglion (DRG) neurites from a micropipette. Ejection of a small volume of 1 mM NOR3 solution (not more than 1 pl/s) from a micropipette to terminal branches of neurites caused(More)
Although ghrelin acts as a modulator of feeding behavior and energy metabolism in the central nervous system, recent studies have implicated the peripheral actions of ghrelin in reproductive tissues. Here, we investigated the expression of ghrelin and its receptor (GHS-R) in mouse oocyte and preimplantation embryos, and we examined the role of ghrelin in(More)
System asc transporter Asc-1, expressed in the brain, transports D- and L-serine with high affinity. To determine the localization of Asc-1 in the rat brain, we isolated a cDNA for the rat orthologue of Asc-1. The encoded protein designated as rAsc-1 (rat Asc-1) exhibited 98% sequence identity to mouse Asc-1 (mAsc-1). Based on amino acid sequences of rAsc-1(More)
Larval muscle fibers of a beetle, Xylotrupes dichotomus, produce calcium spikes that are maintained when the fibers are bathed in saline solutions containing manganese, cadmium, zinc, or beryllium instead of calcium. This indicates that these cations permeate the calcium channels of the muscle fiber. By contrast, cobalt, nickel, and magnesium are(More)
Leptin acts as a modulator of diverse reproductive functions, and recent studies have implicated involvement of leptin in the early embryo development in mammal. The aim of this study was to investigate the expression of leptin and its receptor (OB-R) in mouse oocyte and preimplantation embryo, and to examine whether leptin influenced the early embryo(More)
Hormonal factors secreted by embryos and reproductive tracts are important for successful development of preimplantation embryos. We found expression of brain-derived neurotrophic factor (BDNF) and neurotrophin-4/5 (NT-4/5) transcripts at its highest levels in the blastocyst stages. The transcripts for their receptor, TrkB, were detectable throughout the(More)