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- W56109864 abstract "To determine whether nitroxidergic, cholinergic, and vasoactive intestinal polypeptide (VIP)-mediated nerves participate in the regulation of porcine ciliary arterial tone and to analyze the mechanisms underlying the neuronal interaction.Changes in isometric tension were recorded in helical strips of the arteries, which were stimulated by transmurally applied electrical pulses or nicotine. The presence of perivascular nerve fibers containing reduced nicotinamide adenine dinucleotide phosphate (NADPH) diaphorase, acetylcholinesterase, and VIP immunoreactivity were determined histologically.Transmural electrical stimulation (2, 5, and 20 Hz) and nicotine produced a relaxation of the arterial strips denuded of the endothelium and contracted with prostaglandin F2alpha. The response was not influenced by timolol but was abolished by oxyhemoglobin and methylene blue. N(G)-nitro-L-arginine, a nitric oxide (NO) synthase inhibitor, abolished the neurogenic relaxation, and L-arginine restored the response. Physostigmine inhibited, but atropine potentiated, the neurogenic response. The relaxation was attenuated by acetylcholine but was not influenced by VIP. There were nerve fibers and bundles containing NADPH diaphorase, acetylcholinesterase, and VIP immunoreactivity in the adventitia of ciliary arteries.Porcine ciliary arteries are innervated by NO synthase-containing nerves that liberate NO, possibly as a neurotransmitter on excitation to produce muscular relaxation. Nitroxidergic nerve function is inhibited by acetylcholine released from cholinergic nerve, possibly because of impaired production or release of NO. VIP does not seem to function as a neurotransmitter or a modulator." @default.
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- W56109864 date "1997-10-01" @default.
- W56109864 modified "2023-09-23" @default.
- W56109864 title "Modulation by neurogenic acetylcholine of nitroxidergic nerve function in porcine ciliary arteries." @default.
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