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They have attracted much clinical interest recently because of the realization that aberrant signaling in these organs is associated with several pathologies including hypertension. Herein, we describe data suggesting that sympathetic overactivity in neurogenic hypertension is, at least in part, dependent on carotid body tonicity and hyperreflexia that is related to changes in the electrophysiological properties of chemoreceptive petrosal neurons. We present results showing critical roles for both ATP levels in the carotid bodies and expression of P2X3 receptors in petrosal chemoreceptive, but not baroreceptive, terminals in the etiology of carotid body tonicity and hyperreflexia. We discuss mechanisms that may underlie the changes in electrophysiological properties and P2X3 receptor expression in chemoreceptive petrosal neurons, as well as factors affecting ATP release by cells within the carotid bodies. Our findings support the notion of targeting the carotid bodies to reduce sympathetic outflow and arterial pressure, emphasizing the potential clinical importance of modulating purinergic transmission to treat pathologies associated with carotid body dysfunction but, importantly, sparing physiological chemoreflex function.<\/jats:p>","DOI":"10.1152\/ajpregu.00142.2018","type":"journal-article","created":{"date-parts":[[2018,6,27]],"date-time":"2018-06-27T20:03:51Z","timestamp":1530129831000},"page":"R963-R971","source":"Crossref","is-referenced-by-count":15,"title":["Purinergic plasticity within petrosal neurons in hypertension"],"prefix":"10.1152","volume":"315","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6132-0217","authenticated-orcid":false,"given":"Davi J. 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