title: Effect of the ecto-ATPase inhibitor, ARL 67156, on the bovine chromaffin cell response to ATP.
abstract: Bovine chromaffin cells contain an ecto-ATPase (K(m)=1.57 +/- 0.27 x 10(-4) M) which can hydrolyze ATP present in the culture media. ARL 67156 is a competitive inhibitor of this ATPase (K(i)=2.55 +/- 1.36 x 10(-7) M). A small increase in potency (threefold) is seen when ARL 67156 is included during measurement of ATP-stimulated inositol phosphate formation. ARL 67156 also acts on chromaffin cell P2Y receptors to increase inositol phosphate formation (EC(50)=4.9 x 10(-5) M). It is useful as an ecto-ATPase inhibitor in studies with bovine chromaffin cells since it exhibits a 300-fold selectivity for the ecto-ATPase versus the P2Y receptor.
authors.affiliation: Department of Pharmacology, University of Nebraska Medical Center, 986260 Nebraska Medical Center, Omaha, NE 68198-6260, USA.
authors.forename: Desinee A
authors.initials: DA
authors.lastname: Drakulich
authors.forename: Calvin
authors.initials: C
authors.lastname: Spellmon
authors.forename: Terry D
authors.initials: TD
authors.lastname: Hexum
mesh_terms: D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000031:analogs & derivatives* / Q000494:pharmacology*; D000818:Animals; D002417:Cattle; D002478:Cells, Cultured; D019439:Chromaffin Cells / Q000187:drug effects* / Q000201:enzymology; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology*
chemical_list: C092431:6-N,N-diethyl-beta,gamma-dibromomethylene-D-ATP; D004791:Enzyme Inhibitors; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; C027201:ectoATPase