Adenosine receptors regulate gap junction coupling of the human cerebral 
microvascular endothelial cells hCMEC/D3 by Ca2+ influx through cyclic 
nucleotide-gated channels.

Bader, A.; Bintig, W.; Begandt, D.; Klett, A.; Siller, I. G.; Gregor, C.; Schaarschmidt, F.; Weksler, B.; Romero, I.; Couraud, P. O.; Hell, S. W.; Ngezahayo, A.

doi:10.1113/JP273150

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Adenosine receptors regulate gap junction coupling of the human cerebral microvascular endothelial cells hCMEC/D3 by Ca²⁺ influx through cyclic nucleotide-gated channels.

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Gregor, C.
Department of NanoBiophotonics, MPI for Biophysical Chemistry, Max Planck Society;

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Hell, S. W.
Department of NanoBiophotonics, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Bader, A., Bintig, W., Begandt, D., Klett, A., Siller, I. G., Gregor, C., et al. (2017). Adenosine receptors regulate gap junction coupling of the human cerebral microvascular endothelial cells hCMEC/D3 by Ca²⁺ influx through cyclic nucleotide-gated channels. The Journal of Physiology, 595(8), 2497-2517. doi:10.1113/JP273150.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-E925-1

Abstract

The human cerebral microvascular endothelial cell line hCMEC/D3 was used to characterize the physiological link between adenosine receptors and the gap junction coupling in endothelial cells of the blood–brain barrier. Expressed adenosine receptor subtypes and connexin (Cx) isoforms were identified by RT-PCR. Scrape loading/dye transfer was used to evaluate the impact of the A2A and A2B adenosine receptor subtype agonist 2-phenylaminoadenosine (2-PAA) on the gap junction coupling. We found that 2-PAA stimulated cAMP synthesis and enhanced gap junction coupling in a concentration-dependent manner. This enhancement was accompanied by an increase in gap junction plaques formed by Cx43. Inhibition of protein kinase A did not affect the 2-PAA-related enhancement of gap junction coupling. In contrast, the cyclic nucleotide-gated (CNG) channel inhibitor l-cis-diltiazem, as well as the chelation of intracellular Ca2+ with BAPTA, or the absence of external Ca2+, suppressed the 2-PAA-related enhancement of gap junction coupling. Moreover, we observed a 2-PAA-dependent activation of CNG channels by a combination of electrophysiology and pharmacology. In conclusion, the stimulation of adenosine receptors in hCMEC/D3 cells induces a Ca2+ influx by opening CNG channels in a cAMP-dependent manner. Ca2+ in turn induces the formation of new gap junction plaques and a consecutive sustained enhancement of gap junction coupling. The report identifies CNG channels as a physiological link that integrates gap junction coupling into the adenosine receptor-dependent signalling of endothelial cells of the blood–brain barrier.