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Opioid toxicity: histamine, hypersensitivity, and MRGPRX2

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Abstract

Insights into the pathophysiology of many non-immune-mediated drug reactions referred to as toxicities, sensitivities, intolerances, or pseudoallergies have resulted from research identifying the mastocyte-related G-protein-coupled receptor (GPCR) member X2 (MRGPRX2), a human mast cell receptor mediating adverse reactions without the involvement of antibody priming. Opioid-induced degranulation of mast cells, particularly morphine, provoking release of histamine and other preformed mediators and causing hemodynamic and cutaneous changes seen as flushing, headache and wheal and flare reactions in the skin, is an example of results of MRGPRX2 activation. Opioids including morphine, codeine, dextromethorphan and metazocine as well as endogenous prodynorphin opioid peptides activate MRGPRX2 at concentrations causing mast cell degranulation. Unlike the canonical opioid receptors, MRGPRX2 shows stereochemical recognition preference for dextro rather than levo opioid enantiomers. Opioid analgesic drugs (OADs) display a range of histamine-releasing potencies from the strong releaser morphine to doubtful releasers like hydromorphone and the non-releaser fentanyl. Whether there is a correlation between histamine release by individual OADs, MRGPRX2 activation, and presence or absence of adverse cutaneous effects is not known. To investigate the question, ongoing research with recently pursued methodologies and strategies employing basophil and mast cell tests resulting from MRGPRX2 insights should help to elucidate whether or not an opioid's histamine-releasing potency, and its property of provoking an adverse reaction, are each a reflection of its activation of MRGPRX2.

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Data is available from the corresponding author (BAB) on request.

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Acknowledgements

The authors thank Drs DG Ebo and J Elst for helpful comments on the manuscript.

Funding

No funding was received to assist in the preparation of this review.

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BAB conceived the study, undertook the literature review, prepared figures, and wrote the paper. NHP contributed to the literature review, prepared figures, and helped review the manuscript. Both authors approved the final draft of the review and agree to be accountable for all aspects of the work.

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Correspondence to Brian A. Baldo.

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The authors declare that they have no known competing financial interests or personal relationships that influenced the work reported here.

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Brian A. Baldo and Nghia H. Pham are retired. The positions and affiliations listed are those prior to retirement.

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Baldo, B.A., Pham, N.H. Opioid toxicity: histamine, hypersensitivity, and MRGPRX2. Arch Toxicol 97, 359–375 (2023). https://doi.org/10.1007/s00204-022-03402-2

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  • DOI: https://doi.org/10.1007/s00204-022-03402-2

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