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Human urothelial cell lines as potential models for studying cannabinoid and excitatory receptor interactions in the urinary bladder

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Abstract

To characterize human urothelial cell lines’ cannabinoid receptor expression and evaluate their possible use for studying signalling interactions with purinergic and muscarinic receptor activation. PCR was used to detect cannabinoid (CB), muscarinic and purinergic receptor transcripts in HCV29 and UROtsa cells, whilst immunofluorescence evaluated protein expression and localization of cannabinoid receptors. The effect of CB1 agonist (ACEA) on carbachol- and ATP-induced changes in intracellular calcium ([Ca2+]i) levels was measured using fluorimetry. The ability of ACEA to reduce intracellular cAMP was investigated in HCV29 cells. CB1 and GPR55 receptor transcripts were detected in HCV29 and UROtsa cells, respectively. Immunofluorescence showed positive staining for CB1 in the HCV29 cells. Both cell lines expressed transcript levels for muscarinic receptors, but carbachol did not raise [Ca2+]i levels indicating a lack or low expression of Gq-coupled muscarinic receptors. Transcripts for purinergic receptors were detected; ATP significantly increased [Ca2+]i in HCV29 and UROtsa cells by 395 ± 61 and 705 ± 100 nM (mean ± SEM, n = 6), respectively. ACEA did not alter ATP-induced [Ca2+]i or cAMP levels in HCV29 cells. Whilst HCV29 cells expressed CB1 and UROtsa cells expressed GPR55 receptors, these were not functionally coupled to the existing purinergic-driven increase in Ca2+ as such they do not represent a good model to study signalling interactions.

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Acknowledgments

This study was funded by Wellbeing of Women Training Fellowship awarded to Dr. Bakali.

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Authors and Affiliations

  1. Reproductive Sciences Section, Department of Cancer Studies and Molecular Medicine, University of Leicester, Robert Kilpatrick Clinical Sciences Building, Leicester, LE2 7LX, UK

    Evangelia Bakali, Ruth A. Elliott, Anthony H. Taylor, Jonathon M. Willets & Douglas G. Tincello

  2. Department of Cardiovascular Sciences, Division of Anaesthesia, Critical Care and Pain Management, University of Leicester, Leicester Royal Infirmary, Leicester, UK

    David G. Lambert

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  1. Evangelia Bakali
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  2. Ruth A. Elliott
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  3. Anthony H. Taylor
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  4. David G. Lambert
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  5. Jonathon M. Willets
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  6. Douglas G. Tincello
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Correspondence to Evangelia Bakali.

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Bakali, E., Elliott, R.A., Taylor, A.H. et al. Human urothelial cell lines as potential models for studying cannabinoid and excitatory receptor interactions in the urinary bladder. Naunyn-Schmiedeberg's Arch Pharmacol 387, 581–589 (2014). https://doi.org/10.1007/s00210-014-0973-5

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  • DOI: https://doi.org/10.1007/s00210-014-0973-5

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