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The A2B adenosine receptor colocalizes with adenosine deaminase in resting parietal cells from gastric mucosa

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Abstract

The A2B adenosine receptor (A2BR) mediates biological responses to extracellular adenosine in a wide variety of cell types. Adenosine deaminase (ADA) can degrade adenosine and bind extracellularly to adenosine receptors. Adenosine modulates chloride secretion in gastric glands and gastric mucosa parietal cells. A close functional link between surface A2BR and ADA has been found on cells of the immune system, but whether this occurs in the gastrointestinal tract is unknown. The goal of this study was to determine whether A2BR and ADA are coexpressed at the plasma membrane of the acid-secreting gastric mucosa parietal cells. We used isolated gastric parietal cells after purification by centrifugal elutriation. The membrane fraction was obtained by sucrose gradient centrifugation. A2BR mRNA expression was analyzed by RT-PCR. The surface expression of A2BR and ADA proteins was evaluated by Western blotting, flow cytometry and confocal microscopy. Our findings demonstrate that A2BR and ADA are expressed in cell membranes isolated from gastric parietal cells. They show a high degree of colocalization that is particularly evident in the surface of contact between parietal cells. The confocal microscopy data together with flow cytometry analysis suggest a tight association between A2BR and ADA that might be specifically linked to glandular secretory function.

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Abbreviations

A2BR:

A2B adenosine receptor

ADA:

adenosine deaminase

RT-PCR:

reverse transcription-polymerase chain reaction

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Authors and Affiliations

  1. Department of Physiology, Faculty of Medicine and Dentistry, University of the Basque Country UPV/EHU, Sarriena s/n, 48940, Leioa, Spain

    R. M. Arin, A. I. Vallejo, Y. Rueda, O. Fresnedo & B. Ochoa

Authors
  1. R. M. Arin
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  2. A. I. Vallejo
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  3. Y. Rueda
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  4. O. Fresnedo
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  5. B. Ochoa
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Correspondence to R. M. Arin.

Additional information

Published in Russian in Biokhimiya, 2015, Vol. 80, No. 1, pp. 150–156.

Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM14-219, December 28, 2014.

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Arin, R.M., Vallejo, A.I., Rueda, Y. et al. The A2B adenosine receptor colocalizes with adenosine deaminase in resting parietal cells from gastric mucosa. Biochemistry Moscow 80, 120–125 (2015). https://doi.org/10.1134/S0006297915010149

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  • DOI: https://doi.org/10.1134/S0006297915010149

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