CGS 21680 HCl

Cell experiment:

10×106 MNCs from each group are re-suspended in 2 mL RPMI 1640. Cell suspensions are added with carboxy-fluorescein diacetate, succinimidyl ester (CFSE, final concentration 2.5 μM) and thoroughly mixed. After incubation in the dark for 15 min at 37°C, the staining process is quenched by adding 10 mL ice-cold complete RPMI 1640 (containing 10% FBS) and incubated on ice for 5 min. Then cells are washed twice with RPMI 1640. Cell pellets are re-suspended in complete RPMI 1640 (containing 10% FBS). The stained MNCs (1×106 cells/mL, 1 mL/well) are cultured in triplicates in 24-well culture plates in the dark at 37°C. Each well is supplied with 50 μL of Concanavalin A (ConA, final concentration 5 μg/mL) or 50 μL of P0 peptide (final concentration 10 μg/mL). 72 h later, cells are collected and stained with PE-labeled anti-rat CD4 antibody for 30 min at 4°C. Finally, cells are analyzed with a flow cytometer.

Animal experiment:

Female Lewis rats aged 6-8 weeks (body weight, 140-160 g) are housed under specific pathogen-free conditions in the local animal facility with free access to water and food. Administration of CGS21680 (at a dose of 1 mg/kg in PBS) starts on day 5 p.i. Rats in experimental group are injected with CGS21680 intraperitoneally (i.p.) every two days until the end of the experiments. Rats in control group are given equal volume of PBS in the same way. The doses (1 mg/kg/i.p.) and the treatment regimen (every two days, start on day 5 p.i.) are determined.

References:

[1]. Bao R, et al. Adenosine and the adenosine A2A receptor agonist, CGS21680, upregulate CD39 and CD73 expression through E2F-1 and CREB in regulatory T cells isolated from septic mice. Int J Mol Med. 2016 Sep;38(3):969-75.
[2]. Komaki S, et al. Trk and cAMP-dependent survival activity of adenosine A(2A) agonist CGS21680 on rat motoneurons in culture. Neurosci Lett. 2012 Jul 26;522(1):21-4.
[3]. Zhang M, et al. Activation of the adenosine A2A receptor exacerbates experimental autoimmune neuritis in Lewis rats in association with enhanced humoral immunity. J Neuroimmunol. 2016 Apr 15;293:129-36.
[4]. Rosaria Volpini, et al. Adenosine receptor agonists: synthesis and binding affinity of 2-(aryl)alkylthioadenosine derivatives.
[5]. Melani A, et al. Low doses of the selective adenosine A2A receptor agonist CGS21680 are protective in a rat model of transient cerebral ischemia. Brain Res. 2014 Mar 10;1551:59-72.