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- W1967698913 abstract "In the present study we found that mesencephalic trigeminal (Mes-V) neurons of the rat are innervated by nitrergic fibers and that nitric oxide (NO) modifies the electrophysiological properties of these cells. Mes-V neurons were surrounded by a network of fibers that contained neuronal nitric oxide synthase (nNOS); these fibers gave rise to terminal-, bouton-like structures which ended in Mes-V cells bodies. These cells, which did not display nNOS-like immunoreactivity were immunoreactive to a cGMP antibody. By performing intracellular recordings in the adult rat brain slice preparation, the effects of diethylenetriamine/NO adduct (DETA/NO) applications were examined. DETA/NO induced a depolarization that averaged 2.2 mV (range: 1-6 mV) in nine of 22 neurons. In 15 of 22 neurons (68% of the cells), there was a decrease in current threshold from 0.74 to 0.60 nA (19%; P<0.001). The excitatory effects of DETA/NO were abolished by ODQ, a blocker of soluble guanylate cyclase. Input resistance (R(in)) decreased in 80% of the cells from a mean of 24.8 to 20.6 Momega (17%; P<0.001) and the membrane time constant (tau(m)) decreased from 7.5 to 5.6 ms (25%; P<0.05). The 'sag' seen in the membrane response of these cells to current pulses was augmented during DETA/NO application. These findings indicate that there is a nitrergic innervation of Mes-V neurons and that these sensory cells are target for NO that may act on them as an excitatory neuromodulator promoting the synthesis of intracellular cGMP." @default.
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- W1967698913 date "2003-01-01" @default.
- W1967698913 modified "2023-10-11" @default.
- W1967698913 title "Mesencephalic trigeminal neurons are innervated by nitric oxide synthase-containing fibers and respond to nitric oxide" @default.
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- W1967698913 doi "https://doi.org/10.1016/s0006-8993(02)03776-9" @default.
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