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For example, the C\u2013C chemokine receptor type 5 (CCR5), which serves as a co-receptor to facilitate cellular entry of human immunodeficiency virus 1 (HIV-1), normally signals through the heterotrimeric G protein, Gi. However, CCR5 also exhibits G protein signaling bias and certain chemokine analogs can cause a switch to Gq pathways to induce Ca<jats:sup>2+<\/jats:sup> signaling. We want to understand how much of the Ca<jats:sup>2+<\/jats:sup> signaling from Gi-coupled receptors is due to G protein promiscuity and how much is due to transactivation and crosstalk with other receptors. We propose a possible mechanism underlying the apparent switching between different G protein signaling pathways. We show that chemokine-mediated Ca<jats:sup>2+<\/jats:sup> flux in HEK293T cells expressing CCR5 can be primed and enhanced by ATP pretreatment. In addition, agonist-dependent lysosomal exocytosis results in the release of ATP to the extracellular milieu, which amplifies cellular signaling networks. ATP is quickly degraded via ADP and AMP to adenosine. ATP, ADP and adenosine activate different cell surface purinergic receptors. Endogenous Gq-coupled purinergic P2Y receptors amplify Ca<jats:sup>2+<\/jats:sup> signaling and allow for Gi- and Gq-coupled receptor signaling pathways to converge. Associated secretory release of GPCR ligands, such as chemokines, opioids, and monoamines, should also lead to concomitant release of ATP with a synergistic effect on Ca<jats:sup>2+<\/jats:sup> signaling. Our results suggest that crosstalk between ATP-activated purinergic receptors and other Gi-coupled GPCRs is an important cooperative mechanism to amplify the intracellular Ca<jats:sup>2+<\/jats:sup> signaling response.<\/jats:p>","DOI":"10.1007\/s10571-020-01002-1","type":"journal-article","created":{"date-parts":[[2020,11,20]],"date-time":"2020-11-20T12:03:53Z","timestamp":1605873833000},"page":"1085-1101","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Purinergic Receptors Crosstalk with CCR5 to Amplify Ca2+ Signaling"],"prefix":"10.1007","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0947-2744","authenticated-orcid":false,"given":"Mizuho","family":"Horioka","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6563-9751","authenticated-orcid":false,"given":"Emilie","family":"Ceraudo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0008-0966","authenticated-orcid":false,"given":"Emily","family":"Lorenzen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2836-8953","authenticated-orcid":false,"given":"Thomas P.","family":"Sakmar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1844-262X","authenticated-orcid":false,"given":"Thomas","family":"Huber","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,11,20]]},"reference":[{"key":"1002_CR1","doi-asserted-by":"publisher","first-page":"9351","DOI":"10.1016\/S0021-9258(17)42705-0","volume":"259","author":"T Asano","year":"1984","unstructured":"Asano T, Katada T, Gilman AG, Ross EM (1984) Activation of the inhibitory GTP-binding protein of adenylate cyclase, Gi, by beta-adrenergic receptors in reconstituted phospholipid vesicles. 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