1. Academic Validation
  2. Capadenoson, a clinically trialed partial adenosine A1 receptor agonist, can stimulate adenosine A2B receptor biased agonism

Capadenoson, a clinically trialed partial adenosine A1 receptor agonist, can stimulate adenosine A2B receptor biased agonism

  • Biochem Pharmacol. 2017 Jul 1;135:79-89. doi: 10.1016/j.bcp.2017.03.014.
Jo-Anne Baltos 1 Elizabeth A Vecchio 1 Matthew A Harris 1 Cheng Xue Qin 2 Rebecca H Ritchie 2 Arthur Christopoulos 1 Paul J White 1 Lauren T May 3
Affiliations

Affiliations

  • 1 Drug Discovery Biology & Department of Pharmacology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia.
  • 2 Heart Failure Pharmacology, Baker IDI Heart & Diabetes Institute, Melbourne, VIC 3004, Australia.
  • 3 Drug Discovery Biology & Department of Pharmacology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia. Electronic address: lauren.may@monash.edu.
Abstract

The adenosine A2B receptor (A2BAR) has been identified as an important therapeutic target in Cardiovascular Disease, however in vitro and in vivo targeting has been limited by the paucity of pharmacological tools, particularly potent agonists. Interestingly, 2-((6-amino-3,5-dicyano-4-(4-(cyclopropylmethoxy)phenyl)-2-pyridinyl)thio)acetamide (BAY60-6583), a potent and subtype-selective A2BAR agonist, has the same core structure as 2-amino-6-[[2-(4-chlorophenyl)-1,3-thiazol-4-yl]methylsulfanyl]-4-[4-(2-hydroxyethoxy)phenyl]pyridine-3,5-dicarbonitril (capadenoson). Capadenoson, currently classified as an adenosine A1 receptor (A1AR) partial agonist, has undergone two Phase IIa clinical trials, initially in patients with atrial fibrillation and subsequently in patients with stable angina. Capadenoson has also been shown to decrease cardiac remodeling in an animal model of advanced heart failure and a capadenoson derivative, neladenoson bialanate, recently entered clinical development for the treatment of chronic heart failure. The therapeutic effects of capadenoson are currently thought to be mediated through the A1AR. However, the ability of capadenoson to stimulate additional Adenosine Receptor subtypes, in particular the A2BAR, has not been rigorously assessed. In this study, we demonstrate that capadenoson does indeed have significant A2BAR activity in physiologically relevant cells, cardiac fibroblasts and cardiomyocytes, which endogenously express the A2BAR. Relative to the non-selective Adenosine Receptor agonist NECA, capadenoson was a biased A2BAR agonist with a preference for cAMP signal transduction over other downstream mediators in cells with recombinant and endogenous A2BAR expression. These findings suggest the reclassification of capadenoson as a dual A1AR/A2BAR agonist. Furthermore, a potential A2BAR contribution should be an important consideration for the future clinical development of capadenoson-like therapeutics, as the A2BAR can promote cardioprotection and modulate cardiac fibrosis in heart disease.

Keywords

Adenosine A(2B) receptor; BAY60-6583 (PubChem CID: 11717831); Biased agonist; Capadenoson; Capadenoson (PubChem CID: 9936489); Cardiac fibroblasts; Cardiomyocytes; NECA (PubChem CID: 448222); PSB-603 (PubChem CID: 44185871); SCH442416 (PubChem CID: 10668061); SLV320 (PubChem CID: 9953065); [(3)H]DPCPX (PubChem CID: 53319341).

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