Abstract
Extracellular adenosine 5′-triphosphate (ATP) has significant effects on a variety of pathological conditions and it is the main physiological agonist of P2X7 purinergic receptor (P2X7R). It is known that ATP acting via purinergic receptors plays a relevant role on skin inflammation, and P2X7R is required to neutrophil recruitment in a mice model of irritant contact dermatitis (ICD).The present study investigated the effects of chemical irritant croton oil (CrO) upon ATP, ADP, and AMP hydrolysis in mice blood serum, and the potential involvement of P2X7R. The topical application CrO induced a decrease on soluble ATP/ADPase activities (~50 %), and the treatment with the selective P2X7R antagonist, A438079, reversed these effects to control level. Furthermore, we showed that CrO decreased cellular viability (52.6 % ± 3.9) in relation to the control and caused necrosis in keratinocytes (PI positive cells). The necrosis induced by CrO was prevented by the pre-treatment with the selective P2X7R antagonist A438079. The results presented herein suggest that CrO exerts an inhibitory effect on the activity of ATPDase in mouse serum, reinforcing the idea that ICD has a pathogenic mechanism dependent of CD39. Furthermore, it is tempting to suggest that P2X7R may act as a controller of the extracellular levels of ATP.
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Acknowledgments
The authors thank Mr. Juliano Soares for the excellent technical assistance, Dr. Décio dos Santos Pinto Jr. for the donation of the cell line, Dr. Maria Martha Campos for her critical advice, and Me. Marina Petersen Gehring for helping with the experiments. Da Silva, G.L. thanks Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the fellowship.
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R. F. Zanin and G. L. da Silva have contributed equally.
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Zanin, R.F., da Silva, G.L., Erig, T. et al. Decrease of serum adenine nucleotide hydrolysis in an irritant contact dermatitis mice model: potential P2X7R involvement. Mol Cell Biochem 404, 221–228 (2015). https://doi.org/10.1007/s11010-015-2381-7
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DOI: https://doi.org/10.1007/s11010-015-2381-7