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To date there are limited options for treating this core symptomology. Treatments that stimulate adenosine A<jats:sub>2A<\/jats:sub> receptors may represent a promising approach for reducing RRBs in ASD. This is because A<jats:sub>2A<\/jats:sub> receptors are expressed on striatal neurons of the basal ganglia indirect pathway. Under activation of this pathway has been associated with RRBs while activation of A<jats:sub>2A<\/jats:sub> receptors leads to increased activity of the indirect basal ganglia pathway. The present studies investigated whether acute, systemic treatment with CGS21680, an A<jats:sub>2A<\/jats:sub> receptor agonist attenuates elevated self\u2010grooming and a probabilistic reversal learning deficit in the BTBR T+ <jats:italic>Itpr3<jats:sup>tf<\/jats:sup><\/jats:italic>\/J (BTBR) mouse model of idiopathic autism. The effects of this treatment were also investigated in C57BL\/6J (B6) mice as a comparison strain. Using a spatial reversal learning test with 80\/20 probabilistic feedback, comparable to one in which ASD individuals exhibit deficits, CGS 21680 (0.005 and 0.01mg\/kg) attenuated a reversal learning deficit in BTBR mice. Enhancement in probabilistic reversal learning performance resulted from CGS 21680 improving the consistent maintenance of new adaptive behavioral choice patterns after reversal. CGS 21680 at 0.01 mg, but not 0.005 mg, also reduced self\u2010grooming behavior in BTBR mice. CGS 21680 did not affect self\u2010grooming or reversal learning in B6 mice. These findings demonstrate that A<jats:sub>2A<\/jats:sub> receptor agonists may be a promising receptor target in the treatment of RRBs in ASD. <jats:bold><jats:italic>Autism Res<\/jats:italic><\/jats:bold> <jats:italic>2018, 11: 223\u2013233<\/jats:italic>. \u00a9 2017 International Society for Autism Research, Wiley Periodicals, Inc.<\/jats:p><\/jats:sec><jats:sec><jats:title>Lay Summary<\/jats:title><jats:p>The present experiments determined whether the drug, CGS 21680, that facilitates activation of adenosine A<jats:sub>2A<\/jats:sub> receptors in the brain, would reduce repetitive and inflexible behaviors in the BTBR mouse model of idiopathic autism. CGS 21680 treatment in BTBR mice reduced repetitive and inflexible behaviors. In the control C57BL\/6J (B6) mouse strain, CGS 21680 did not affect performance. These findings suggest that stimulation of brain adenosine A<jats:sub>2A<\/jats:sub> receptors may be a promising therapeutic strategy in ASD.<\/jats:p><\/jats:sec>","DOI":"10.1002\/aur.1901","type":"journal-article","created":{"date-parts":[[2017,11,29]],"date-time":"2017-11-29T17:58:08Z","timestamp":1511978288000},"page":"223-233","source":"Crossref","is-referenced-by-count":34,"title":["The adenosine A<sub>2A<\/sub> receptor agonist, CGS 21680, attenuates a probabilistic reversal learning deficit and elevated grooming behavior in BTBR mice"],"prefix":"10.1002","volume":"11","author":[{"given":"Dionisio A.","family":"Amodeo","sequence":"first","affiliation":[{"name":"Department of Psychology University of Illinois at Chicago, 1007 West Harrison Street [M\/C 285] Chicago IL 60607\u20107137"},{"name":"Department of Psychology California State University San Bernardino, 5500 University Parkway San Bernardino CA 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