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• W2000374524 endingPage "180" @default.
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• W2000374524 abstract "The presence of large numbers of dopaminergic neurons in the olfactory bulb suggests that dopamine plays an important role in olfaction. Dopamine D2 receptors are produced in olfactory sensory neurons [Shipley et al. (1991) Chem. Senses16, 5] and found in relatively high concentrations in their terminals in the nerve and glomerular layers of the olfactory bulb [Nickell et al. (1991) NeuroReport2, 9–12]. In other systems D2 receptors are linked to adenylyl cyclase by an inhibitory G-protein, and activation of the receptors results in inhibition of the enzyme. We examined rat olfactory mucous membrane to determine whether the D2 receptors were linked functionally to adenylyl cyclase as they are in other tissues. Adenylyl cyclase is found in both the olfactory cilia of the sensory epithelium and olfactory nerve terminals in the bulb. Bromocriptine, a D2 receptor agonist, was added to olfactory epithelium membrane preparations from normal and unilaterally bulbectomized adult rats and the preparations were assayed for forskolin-stimulated adenylyl cyclase activity. In unoperated animals bromocriptine significantly inhibited adenylyl cyclase activity, and the inhibition was abolished following pertussis toxin treatment. In mucosa from unilaterally bulbectomized animals we saw significantly lower adenylyl cyclase activity on the operated side and a further decrease in response to bromocriptine. The data indicate that bromocriptine decreases adenylyl cyclase activity in olfactory tissue, specifically in the sensory neurons, and the reaction is dependent on a pertussis toxin-sensitive G-protein. Given the absence of dopaminergic input to the olfactory epithelium, we propose that dopamine D2 receptors are more probably functionally linked to the adenylyl cyclase that is being transported to the axon terminals than to the adenylyl cyclase in cilia. The results also suggest that receptors are coupled to G-proteins before they are transported to nerve terminals." @default.
• W2000374524 created "2016-06-24" @default.
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• W2000374524 date "1993-11-01" @default.
• W2000374524 modified "2023-10-06" @default.
• W2000374524 title "Bromocriptine, a dopamine d2 receptor agonist, inhibits adenylyl cyclase activity in rat olfactory epithelium" @default.
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• W2000374524 doi "https://doi.org/10.1016/0306-4522(93)90119-z" @default.
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