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• W2920786591 endingPage "e3000161" @default.
• W2920786591 startingPage "e3000161" @default.
• W2920786591 abstract "Adenosine is a constituent of many molecules of life; increased free extracellular adenosine indicates cell damage or metabolic stress. The importance of adenosine signaling in basal physiology, as opposed to adaptive responses to danger/damage situations, is unclear. We generated mice lacking all four adenosine receptors (ARs), Adora1-/-;Adora2a-/-;Adora2b-/-;Adora3-/- (quad knockout [QKO]), to enable investigation of the AR dependence of physiologic processes, focusing on body temperature. The QKO mice demonstrate that ARs are not required for growth, metabolism, breeding, and body temperature regulation (diurnal variation, response to stress, and torpor). However, the mice showed decreased survival starting at about 15 weeks of age. While adenosine agonists cause profound hypothermia via each AR, adenosine did not cause hypothermia (or bradycardia or hypotension) in QKO mice, indicating that AR-independent signals do not contribute to adenosine-induced hypothermia. The hypothermia elicited by adenosine kinase inhibition (with A134974), inosine, or uridine also required ARs, as each was abolished in the QKO mice. The proposed mechanism for uridine-induced hypothermia is inhibition of adenosine transport by uridine, increasing local extracellular adenosine levels. In contrast, adenosine 5'-monophosphate (AMP)-induced hypothermia was attenuated in QKO mice, demonstrating roles for both AR-dependent and AR-independent mechanisms in this process. The physiology of the QKO mice appears to be the sum of the individual knockout mice, without clear evidence for synergy, indicating that the actions of the four ARs are generally complementary. The phenotype of the QKO mice suggests that, while extracellular adenosine is a signal of stress, damage, and/or danger, it is less important for baseline regulation of body temperature." @default.
• W2920786591 created "2019-03-11" @default.
• W2920786591 creator A5023458816 @default.
• W2920786591 creator A5028243061 @default.
• W2920786591 creator A5062031732 @default.
• W2920786591 creator A5090202993 @default.
• W2920786591 creator A5091587615 @default.
• W2920786591 date "2019-03-01" @default.
• W2920786591 modified "2023-09-27" @default.
• W2920786591 title "Physiology and effects of nucleosides in mice lacking all four adenosine receptors" @default.
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