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Role of proteinase-activated receptors 1 and 2 in nonsteroidal anti-inflammatory drug enteropathy

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Abstract

Background

The use of nonsteroidal anti-inflammatory drugs (NSAIDs) can promote lower gastrointestinal detrimental effects. Proteinase-activated receptors 1 (PAR1) and PAR2 are involved in the pathophysiology of several digestive disorders. This study examines the contribution of PAR1 and PAR2 in NSAID-induced small intestinal injury, and to investigate the underlying mechanisms.

Methods

Male Wistar rats (40 weeks old) were treated with indomethacin (1.5 mg/kg BID) for 14 days. Subgroups of animals were treated intraperitoneally with TFFLR-NH2 (PAR1 agonist), AC55541 (PAR2 agonist), SCH79797 (PAR1 antagonist) or ENMD-1068 (PAR2 antagonist). After treatments, blood and feces were collected for the assessment of hemoglobin and calprotectin, respectively. The ileum was processed for the evaluation of myeloperoxidase (MPO), malondialdehyde (MDA), and the protein expression of occludin and activated caspase-3.

Results

Indomethacin elicited a significant intestinal damage, associated with a decrease in blood hemoglobin and an increase in tissue MPO, MDA and fecal calprotectin. In this setting, either the PAR1 agonist or PAR2 antagonist counteracted these changes, with the exception of MDA, which was unaffected. By contrast, the PAR1 antagonist or PAR2 agonist did not exert any effect on all the parameters. Indomethacin also decreased occludin and increased activated caspase-3 expression in ileal tissues. The PAR1 agonist or PAR2 antagonist prevented the reduced occludin expression, while the PAR2 antagonist also decreased the levels of activated caspase-3.

Conclusions

PAR2 is involved in the pathogenesis of indomethacin enteropathy, through pro-inflammatory mechanisms and an impairment of the intestinal epithelial barrier. PAR1 activation and PAR2 inhibition could represent suitable strategies for the prevention of NSAID enteropathy.

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Funding

This study received funding from the BMS/Pfizer European Thrombosis Investigator Initiated Research Program (ERISTA). Award number: 2014-API-0020. The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article or the decision to submit it for publication.

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MF: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Validation, Visualization, Writing—original draft, Writing—review and editing; RC: Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Writing—review and editing; CP: Data curation, Formal analysis, Methodology, Software; LB: Data curation, Formal analysis, Methodology, Software; GN: Conceptualization, Data curation, Resources, Writing—review and editing; LR: Conceptualization, Resources, Visualization; CB: Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Writing—review and editing; LA: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Validation, Visualization, Writing—original draft, Writing—review and editing.

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Correspondence to Matteo Fornai.

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Fornai, M., Colucci, R., Pellegrini, C. et al. Role of proteinase-activated receptors 1 and 2 in nonsteroidal anti-inflammatory drug enteropathy. Pharmacol. Rep 72, 1347–1357 (2020). https://doi.org/10.1007/s43440-020-00119-w

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