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Adenosine Release and Uptake in Cerebellar Granule Neurons Both Occur via an Equilibrative Nucleoside Carrier that Is Modulated by G Proteins


Address correspondence and reprint requests to Dr. M. I. Sweeney at Department of Physiology, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada.


Abstract: There is debate about the mechanisms mediating adenosine release from neurons. In this study, the release of adenosine evoked by depolarizing cultured cerebellar granule neurons with 50 mM K+ was inhibited by 49 ± 7% in Ca2+-free medium. The remaining release was blocked by dipyridamole (IC50 = 6.4 × 10−8M) and nitrobenzylthioinosine (IC50 = 3.6 × 10−8M), inhibitors of adenosine uptake. Ca2+-dependent release was reduced by 78 ± 9% following a 21-h pretreatment of the cells with pertussis toxin, which ADP-ribosylates Gi/Go G proteins, thereby preventing their dissociation. The nucleoside transporter-mediated component of K+-induced adenosine release also was inhibited by 62 ± 8% by pertussis toxin and was potentiated by 78 ± 11% following cholera toxin treatment, which permanently activates Gs. Uptake of [3H]adenosine into cultured cerebellar granule neurons over a 10-min period was not dependent on extracellular Na+ but was reduced by dipyridamole (IC50 = 3.2 × 10−8M) and nitrobenzylthioinosine (IC50 = 2.6 × 10−8M). Thus, adenosine uptake likely occurs via the same transporter mediating Ca2+-independent adenosine release. Adenosine uptake was potentiated by cholera toxin pretreatment (152 ± 15% of control), but pertussis toxin had no statistically significant effect. It is possible that Gs, Gi/Go, or free Gβγ dimer modulate the equilibrative, inhibitor-sensitive nucleoside carrier to enhance adenosine transport.