title: The antidepressant-like effect of inosine in the FST is associated with both adenosine A1 and A 2A receptors.
abstract: Inosine is an endogenous purine nucleoside, which is formed during the breakdown of adenosine. The adenosinergic system was already described as capable of modulating mood in preclinical models; we now explored the effects of inosine in two predictive models of depression: the forced swim test (FST) and tail suspension test (TST). Mice treated with inosine displayed higher anti-immobility in the FST (5 and 50 mg/kg, intraperitoneal route (i.p.)) and in the TST (1 and 10 mg/kg, i.p.) when compared to vehicle-treated groups. These antidepressant-like effects started 30 min and lasted for 2 h after intraperitoneal administration of inosine and were not accompanied by any changes in the ambulatory activity in the open-field test. Both adenosine A1 and A2A receptor antagonists prevented the antidepressant-like effect of inosine in the FST. In addition, the administration of an adenosine deaminase inhibitor (1 and 10 mg/kg, i.p.) also caused an antidepressant-like effect in the FST. These results indicate that inosine possesses an antidepressant-like effect in the FST and TST probably through the activation of adenosine A1 and A2A receptors, further reinforcing the potential of targeting the purinergic system to the management of mood disorders.
authors.affiliation: Department of Life and Health Sciences, Universidade Católica de Pelotas (UCPel), Pelotas, Rio Grande do Sul, Brazil. manu.kaster@gmail.com
authors.forename: Manuella P
authors.initials: MP
authors.lastname: Kaster
authors.forename: Josiane
authors.initials: J
authors.lastname: Budni
authors.forename: Marta
authors.initials: M
authors.lastname: Gazal
authors.forename: Mauricio P
authors.initials: MP
authors.lastname: Cunha
authors.forename: Adair R S
authors.initials: AR
authors.lastname: Santos
authors.forename: Ana Lúcia S
authors.initials: AL
authors.lastname: Rodrigues
mesh_terms: D000818:Animals; D000928:Antidepressive Agents / Q000494:pharmacology; D003863:Depression / Q000378:metabolism*; D004195:Disease Models, Animal; D007288:Inosine / Q000378:metabolism* / Q000494:pharmacology; D008297:Male; D051379:Mice; D043682:Receptor, Adenosine A1 / Q000378:metabolism*; D043705:Receptor, Adenosine A2A / Q000378:metabolism*; D013315:Stress, Psychological / Q000378:metabolism
chemical_list: D000928:Antidepressive Agents; D043682:Receptor, Adenosine A1; D043705:Receptor, Adenosine A2A; D007288:Inosine