Abstract
Sepsis is a life-threatening organ dysfunction caused by a dysregulated inflammatory response to infection. To date, there is no specific treatment established for sepsis. In the extracellular compartment, purines such as adenosine triphosphate (ATP) and adenosine play essential roles in the immune/inflammatory responses during sepsis and septic shock. The balance of extracellular levels among ATP and adenosine is intimately involved in the signals related to immune stimulation/immunosuppression balance. Specialized enzymes, including CD39, CD73, and adenosine deaminase (ADA), are responsible to metabolize ATP to adenosine which will further sensitize the P2 and P1 purinoceptors, respectively. Disruption of the purinergic pathway had been described in the sepsis pathophysiology. Although purinergic signaling has been suggested as a potential target for sepsis treatment, the majority of data available were obtained using pre-clinical approaches. We hypothesized that, as a reflection of deregulation on purinergic signaling, septic patients exhibit differential measurements of serum, neutrophils and monocytes purinergic pathway markers when compared to two types of controls (healthy and ward). It was observed that ATP and ADP serum levels were increased in septic patients, as well as the A2a mRNA expression in neutrophils and monocytes. Both ATPase/ADPase activities were increased during sepsis. Serum ATP and ADP levels, and both ATPase and ADPase activities were associated with the diagnosis of sepsis, representing potential biomarkers candidates. In conclusion, our results advance the translation of purinergic signaling from pre-clinical models into the clinical setting opening opportunities for so much needed new strategies for sepsis and septic shock diagnostics and treatment.
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Acknowledgements
We would like to thank all participants and their families for their participation in the current study.
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This study was supported by the Brazilian agencies: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq – Processo 315522/2021–6); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES; Código de Processamento 001). Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS – Processo 22/2551–0000388-5). P.O. de Souza, A.P.S. Bertoni, J.H. Azambuja, M. Dal Prá, L.L.P. da Cruz, and N.E. Gelsleichter were recipients of UFCSPA, CAPES or CNPq scholarships. This work was supported by the National Institutes of Health Grants R01GM06618916, R01DK11379004 and R01HL158519 awarded to GH.
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ROL, MRW, RMS, GH, and EB contributed to the study conception and design. Material preparation, data collection and analysis were performed by ROL, POS, FdS, KRM, APSB, MSS, JHA, MDP, LLPC, NEG, KB. The first draft of the manuscript was written by ROL, POS and CBH. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The current study was approved by the Research Ethics Committee (registration numbers 49959315.5.0000.5530 and 49959315.5.3001.5345). Every subject or proxy provided written informed consent before inclusion in the study.
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10238_2023_1045_MOESM1_ESM.tif
Supplementary Figure 1: In silico gene expression of ADORA2A, P2RX7 and P2RY2 receptors and NT5E, ENTPD1 and ADA enzymes in septic samples (red) compared to healthy samples (blue) in GSE137310 (A), and GSE54512 (B) datasets. (TIF 282 kb)
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Leite, R.O., de Souza, P.O., Haas, C.B. et al. ATPergic signaling disruption in human sepsis as a potential source of biomarkers for clinical use. Clin Exp Med 23, 3651–3662 (2023). https://doi.org/10.1007/s10238-023-01045-w
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DOI: https://doi.org/10.1007/s10238-023-01045-w