Abstract
The study of anaphylactoid reactions during perioperative procedures and anaesthesia represents a diagnostic challenge for allergists, as many drugs are administered simultaneously, and approximately half of them trigger allergic reactions without a verifiable IgE-mediated mechanism. Recently, mast cell receptor MRGPRX2 has been identified as a cause of pseudo-allergic drug reactions. In this study, we analyse the ability of certain drugs used during perioperative procedures and anaesthesia to induce MRGPRX2-dependent degranulation in human mast cells and sera from patients who experienced an anaphylactoid reaction during the perioperative procedure. Using a β-hexosaminidase release assay, several drugs were seen to cause mast cell degranulation in vitro in comparison with unstimulated cells, but only morphine, vancomycin and cisatracurium specifically triggered this receptor, as assessed by the release of β-hexosaminidase in the control versus the MRGPRX2-silenced cells. The same outcome was seen when measuring degranulation based on the percentage of CD63 expression at identical doses. Unlike that of the healthy controls, the sera of patients who had experienced an anaphylactoid reaction induced mast-cell degranulation. The degranulation ability of these sera decreased when MRGPRX2 was silenced. In conclusion, MRGPRX2 is a candidate for consideration in non-IgE-mediated allergic reactions to some perioperative drugs, reinforcing its role in mast cell responses and their pathophysiology.
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Introduction
Allergic reactions occurring during perioperative procedures and anaesthesia may be severe and life-threatening for the patient. The study of these reactions represents a diagnostic challenge for allergists, as many drugs are administered simultaneously, including anaesthesia inducers, opiates, muscle relaxants, antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs), iodinated contrast agents, plasma expanders or dyes. In fact, a major issue in these reactions is that the triggering drug cannot be identified in approximately half of cases, since the allergy study is negative1.
Study protocols establish that, when skin tests with suspected drugs have yielded negative results, a challenge or dose-provocative test (DPT) must be carried out to rule out an allergy2. However, this should not be performed, for example, with neuromuscular blocking agents (NMBAs), such as atracurium or succinylcholine, and other anaesthetic drugs3. This type of test also entails a high risk, particularly in patients who have experienced anaphylaxis. Therefore, there is a clear need to deepen our understanding on the mechanism of action of some of these reactions.
Recently, the Mas-Related G-Protein-coupled Receptor X2 (MRGPRX2) has been identified as a target for certain drugs, such as neuromuscular blocking agents (atracurium, rocuronium) or fluoroquinolones (ciprofloxacin, levofloxacin), associated with systemic pseudoallergic or anaphylactoid reactions4,5. This receptor is expressed on human mast cells, the main cells involved in anaphylactic reactions.
In this paper we will analyse whether MRGPRX2 may be involved in pseudoallergic reactions associated with drugs used in anaesthesia, in which an IgE-mediated mechanism is not identified.
To this end, we intend to test drugs used in perioperative procedures and anaesthesia, such as opiates, muscle relaxants, iodinated contrast agents, antibiotics and NSAIDs, based on MRGPRX2 expression in a mast cell line, and to analyse the ability of these drugs to induce a response mediated by this receptor.
We hypothesize that the MRGPRX2 receptor may be responsible for allergic reactions occurring during anaesthesia. To confirm this hypothesis, we tested drugs capable of degranulating mast cells in cells where the expression of MRGPRX2 had been selectively silenced, to determine the role of the receptor in such process. Moreover, sera from both patients who had suffered an allergic reaction during anaesthesia and healthy controls were also tested to assess the reactivity in our cell model.
Results
Analysis of the ability of drugs used during perioperative procedures and anaesthesia to induce degranulation in human mast cells
We first tested the ability of several drugs used in perioperative procedures and anaesthesia (cisatracurium, rocuronium, meglumine amidotrizoate, iohexol, iomeprol, propofol, vancomycin, teicoplanin, amoxicillin-clavulanic acid, diclofenac, remifentanil and morphine) to directly stimulate mast cells. To this end, we incubated LAD2 mast cells with different concentrations of these drugs and analysed their degranulation response using a β-hexosaminidase activity assay. Unstimulated cells (CTL-) were used in all cases as negative controls to evaluate basal degranulation, and cells stimulated with phorbol 12-myristate 13-acetate (PMA) plus ionomycin (I + P) were used as positive controls for degranulation. Our data showed that, among the NMBAs tested, only cisatracurium, at doses over 50 µg/mL, was able to induce cell degranulation (Fig. 1A). Of the three iodinated contrasts used (Fig. 1B), meglumine amidotrizoate (at doses over 100 mg/mL) and iomeprol (at doses over 350 mg/mL), but not iohexol, induced cell degranulation. Opiate morphine (but not remifentanil) induced cell degranulation at very low doses (10 μg/mL) (Fig. 1C), whereas, of all antibiotics tested, only vancomycin at a dose of 500 μg/mL induced cell degranulation (Fig. 1E). As an exception, the ability of propofol to induce mast cell degranulation was determined by flow cytometry, because the colour of the compound interfered with the β-hexosaminidase colorimetric assay. Propofol did not induce mast cell degranulation (data not shown). In short, cisatracurium (17.75 ± 2.03, p = 0.022), meglumine amidotrizoate (26 ± 0.73, p = 0.026), iomeprol (26.12 ± 0.52, p-value = 0.025), morphine (56.92 ± 0.14, p < 0.0001) and vancomycin (44.06 ± 1.39, p < 0.0001) caused mast cell degranulation in vitro when examined in comparison with unstimulated cells (6.71 ± 0.62) (Table 1).
Cell viability was measured in all cases in order to discard degranulation due to cell mortality. Cell viability was similar in all cases and over 90% (data not shown).
Mast cell degranulation by cisatracurium, morphine and vancomycin depends on MRGPRX2 expression
To test whether the stimulation of mast cells by these drugs is mediated by the MRGPRX2 receptor, we obtained human mast cells with reduced MRGPRX2 receptor expression from the LAD2 line, using a lentiviral knockdown system. Cells transduced with the scramble sequence, which we designated as non-target shRNA, were used as controls and analysed together with the silenced cells (MRGPRX2-shRNA). Receptor silencing was confirmed by Western blot and flow cytometry (Fig. 2A,B). FcεRI and KIT, the most characteristic receptors involved in mast cell degranulation and cell survival, were analysed following the MRGPRX2 knockdown. As shown in Fig. 2C–F, the levels of FcεRI (94.9 ± 1.75 vs. 89.73 ± 1.24, p = 0.08) and KIT (98.68 ± 0.71 vs. 96.28 ± 1.77, p = 0.277) expression were similar in both the control and MRGPRX2-silenced cells.
We then analysed the ability of cisatracurium, morphine and vancomycin to induce cell degranulation based on MRGPRX2 knockdown expression. We ruled out meglumine amidotrizoate and iomeprol because such response was only seen at very high doses exceeding the concentration of drugs usually administered to patients for iodinated contrast agents6 (Table 1). Our results showed that MRGPRX2-silenced mast cells had a reduced degranulation response compared to the non-silenced cells (non-target), as measured by β-hexosaminidase release following their activation with morphine at 1 µg/mL (10.11 ± 0.29 vs. 26.17 ± 0.96, p = 0.0019) and 10 µg/mL (10.72 ± 0.44 vs. 72.95 ± 0.1, p < 0.0001), vancomycin at 500 µg/mL (11.41 ± 0.43 vs. 70.32 ± 1.08, p < 0.0001), and cisatracurium at 50 µg/mL (9.45 ± 0.27 vs. 21.59 ± 0.80, p = 0.002) and 100 µg/mL (10.41 ± 0.76 vs. 53.63 ± 5.33, p = 0.0004) (Fig. 3). No significant differences were observed between control, crosslinked IgE or I + P-stimulated cells (CTL-: 6.61 ± 0.69 vs. 9.67 ± 2.47, p = 0.280; I + P: 69.74 ± 6.65 vs. 57.78 ± 1, p = 0.133, IgE-stv: 40.07 ± 0.6723 vs. 32.89 ± 3.258 p = 0.0564) (Fig. 3A).
Flow cytometry was used to confirm the degranulation response based on the percentage of CD63 expression on the cell membrane. We observed a similar reduced response in MRGPRX2-silenced mast cells for cisatracurium at 100 µg/mL (13.21 ± 8.02 vs. 86.63 ± 4.74, p = 0.003), morphine at 10 µg/mL (21.83 ± 11.83 vs. 97.90 ± 0.72, p = 0.023) and vancomycin at 500 µg/mL (12.93 ± 7.53 vs. 98.2 ± 2.06, p = 0.006). For the most part, cells maintained their ability to respond to I + P (I + P: 95.47 ± 2.46 vs. 71.8 ± 14.47, p = 0.242) and crosslinked IgE (IgE-streptavidin: 69.55 ± 6.65 vs. 44.35 ± 6.65, p = 0.116). Unstimulated cells also showed no differences (22.83 ± 5.34 vs. 7.78 ± 2.34, p = 0.09) (Fig. 3B). These results demonstrate that the drugs mainly induced MRGPRX2-mediated degranulation.
Sera from patients who experienced anaphylactoid reactions induce MRGPRX2-mediated mast cell degranulation
The main problem related to the study of anaphylactoid reactions was the great diversity of drugs that can be administered simultaneously to the same patient during the anaesthetic procedure. Hence, in addition to exposing mast cells separately to different drugs, we decided to analyse the response of our mast cell model to sera collected from patients who had suffered an anaphylactoid reaction during anaesthesia.
For this purpose, we obtained several serum samples following the onset of an allergic reaction to perioperative drugs (from time of reaction to 24 h), with a negative skin test (skin prick and intradermal tests). Three of the samples were collected further than 24 hours from the onset of the reaction. Five serum samples from healthy donors (control sera) were also collected. Three of them were from patients after anaesthesia procedure with several drugs showing no adverse reaction. The tryptase and histamine levels of all the allergic patients were also determined (Table 2).
First, we assessed the ability of the sera to induce degranulation in mast cells by measuring CD63 expression using flow cytometry. Unlike the control sera (13.78 ± 2.26 and 11.58 ± 3.964), most of the patient sera were activators to some extent. After MRGPRX2 knockdown, we observed a statistically significant reduction in the activation capacity of most of the sera except for sera from patients P3, P4, P8 and P9. The control sera showed no significant differences (Fig. 4A). This indicated that the degranulation ability of mast cells was partly dependent on MRGPRX2 receptor expression.
We collected sera from some of our patients at long term time points. As shown in Fig. 4B, all tested sera collected after 24 hours of the time of reaction showed statistically significant less capability to activate mast cell degranulation.
Finally, we analysed the sera from patients who went through a perioperative procedure without any anaphylactoid response (C3*, C4*, C5*). We observed that these sera had some ability to induce mast cell degranulation compared to control sera from healthy patients (C1 and C2). This activity was reduced in MRGPRX2-silenced cells (Fig. 4C).
Discussion
The newly discovered MRGPRX2 receptor is a non-canonical G-protein-coupled receptor expressed on human mast cells that plays a role in host defence and allergic inflammation4. Recent findings suggest a role for this receptor in non-IgE-mediated drug-induced pseudoallergic reactions5. In vitro studies have demonstrated that this receptor triggers a different type of mast cell degranulation process than the IgE-dependent one. The substance P-dependent activation of the MRGPRX2 receptor induces a quick, and almost immediate, secretion of small and relatively spherical granules. On the contrary, FcεRI-dependent degranulation results in a more gradual degranulation, with longer and heterogeneous granules. In vivo, the allergic reaction caused by MRGPRX2 is a faster and more localized reaction compared to the more intense, prolonged and systemic reaction triggered by the FcεRI receptor7. In clinical practise, Mertes et al. described that IgE-mediated anaphylaxis are more prone to increase tryptase levels and induce bronchospasm and cardiovascular symptoms while non-IgE mediated reactions frequently show isolated cutaneous symptoms without an increase in tryptase8.
The purpose of our research was to study the recurring clinical issue of allergic reactions to drugs used during perioperative procedures and anaesthesia, which in many cases may be severe or life-threatening for the patient. Despite their low prevalence, we observed that the frequency of these reactions was higher than expected, up to 1 in every 385 procedures9. We focussed in drugs which induce adverse reactions without a verifiable IgE-mediated mechanism.
Among the drugs analysed in this study, morphine and vancomycin resulted in mast cell degranulation at administered doses. Both drugs triggered mast cell degranulation through MRGPRX2 since silencing of the receptor significantly reduced degranulation. This result falls in line with the ability of these two drugs to induce non-IgE-mediated reactions according to clinical experience10. Skin tests are usually negative in these cases, and the reaction frequently appears during the first administration of the drug, without the possibility of becoming sensitized in a previous contact. We have not a complete explanation for the negative result of skin tests in these patients. Skin mast cells have MRGPRX2 receptors in their membrane, and one should wait a positive skin test via MRGPRX2. However, MRGPRX2 is a low-affinity receptor (µg/ml range)11,12 compared to IgE sensitivity against allergens (ng/ml range)13,14. Thus, MRGPRX2 receptor activation in vivo might require to be in close proximity to high local concentrations of the drug10. Other possible explanation could be the modification of the drug after binding to skin proteins or the production of a metabolite that modifies the capacity of activation of MRGPRX2. On the other hand, we should also take into consideration that, even if IgE-mediated reactions are usually associated with positive skin tests, some authors claim to be cautious with the interpretation of these tests and propose basophil activation tests (BAT) as a more reliable measurement of specific IgE-mediated anaphylaxis15. In this context, it has been reported that the results of the prick test with vancomycin does not correlate with the “red man syndrome” (RMS) elicited after intravenous infusion of vancomycin, suggesting that the route of administration could elicit different responses16.
The fact that the drug, which did not produce a positive skin test, was able to activate in vitro mast cells via MRGPRX2, could be explained by the different local concentration of the drug in a cell culture in vitro compared to the in vivo situation, where mast cells may be more heterogeneous and scattered in the skin and the drug can suffer modifications in its structure and inactive metabolites may be produced.
As in previous studies carried out with atracurium5, cisatracurium was seen to cause a dose-dependent MRGPRX2-mediated degranulation in LAD2 cells. Interestingly, cases of IgE-mediated allergic reactions to atracurium have also been reported, thus suggesting a dual mechanism of action for this drug17. We detected no mast cell degranulation in response to rocuronium. In fact, and according to our data, rocuronium proved to significantly induce degranulation mediated by mouse ortholog receptor MrgprB2 rather than by MRGPRX2, thus proving the existence of differences between the human receptor and its mouse ortholog5.
Our data showed that all sera collected at the onset of the allergic reaction (<24 h) in patients with a negative skin test to all the suspicious drugs could induce mast cell degranulation. This capacity is not seen in sera collected at a further time from the anaphylactoid reaction (>24 h). Patients who had an anaphylactoid reaction to morphine, cisatracurium and atracurium showed a statistically significant reduction in MRGPRX2-silenced cells compared to non-target cells. Interestingly, patients who had experienced a reaction to remifentanil and rocuronium did not show a significant decrease. This correlates with our data showing that rocuronium and remifentanil did not trigger any mast cell activation in vitro. Additionally, sera from patients who received several drugs also showed a statistically significant reduction of the degranulation capacity except for those from patients 8 and 9. Interestingly some of the drugs administered to these latter patients, such as succinylcholine5 or fentanyl18, have been described in the past as non-histamine releasers14.
Consequently, the ability of sera to induce mast cell degranulation could be explained by the residual presence of drugs or drug metabolites in the serum samples, indicating that some compounds found in patients could trigger a mast cell response4,6,19. This hypothesis is supported by the fact that the serum from patients who received several drugs without eliciting an allergic response can also induce some mast cell degranulation in vitro. But the higher degranulation capacity of the sera from patients who suffered an anaphylactoid reaction could suggest that some allergic compounds released by the immune system at the moment of the reaction may also participate, inducing mast cell degranulation.
It has been widely reported that iodinated contrast mediums (ICMs) amidotrizoate and iomeprol can induce allergic reactions6. However, in our model, the doses needed to induce β-hexosaminidase release in mast cells were also affecting cell viability. For that reason, we consider that the detected β-hexosaminidase activity was due to cell mortality, which causes general release of intracellular components, rather than to a degranulation process. The other ICM tested, iohexol, did not activate mast cells in vitro at any doses assessed. Therefore, these drugs were excluded from the MRGPRX2 analysis and further studies are required to determine the molecular basis and mechanism of ICM-mediated allergic reactions.
In the near future, it may prove useful to combine drugs and analyse the variable effects of each combination on mast cell degranulation, to collect patient sera at different time points following the anaphylactoid reaction, and to follow up on the kinetics and ability of the sera to induce mast cell degranulation.
In short, our results show that the MRGPRX2 receptor is a potential cause of non-IgE-mediated allergic reactions to several drugs commonly used during perioperative procedures and anaesthesia. Supporting our results, a recent study reported that morphine analogues can induce mast cell degranulation mediated by the MRGPRX2 receptor10.
Our research broadens the scope for the study of non-IgE-mediated reactions. Several conserved polymorphisms for the MRGPRX2 receptor have been described, with 1172 being listed at present in the RefSeq database20, of which 152 are missense mutations. An analysis of MRGPRX2 receptor polymorphisms in the genome of allergic patients would enable us to determine whether this receptor has genomic variability, which could explain why only some patients experienced exacerbated reactions to certain drugs. This genomic variability could increase the receptor’s affinity to the drugs or induce a stronger intracellular response. One possible explanation for this is the fact that this receptor is differentially expressed in the mast cells of different patients, triggering a greater response in those with increased expression. In this regard, MRGPRX2 has been found to be increased in patients with severe chronic urticaria21. The increased expression of this receptor may explain why the injection of neuropeptides, such as substance P, enhances wheal reactions in patients with chronic urticaria as compared to healthy controls.
Overall, we consider that the knowledge about the different forms, variants, or expression levels of the MRGPRX2 receptor may constitute a powerful diagnostic tool for evaluating the predisposition of patients to suffer adverse reactions in response to certain drugs. Such knowledge would allow professionals to personalize the combination of drugs used based on each patient’s genetic profile, so as to reduce the number of anaphylactoid reactions occurring during clinical practice.
Materials and Methods
This study was approved by the institutional review board of the University of Navarra.
Biological samples
The LAD2 human mast cell line was kindly provided by Dr. D. Metcalfe, (NIH Washington)22. The HEK 293LTV cell line (Cell Biolabs Inc, San Diego, CA, USA) was used for lentivirus production. The control sera from healthy patients and the sera from patients who had experienced an allergic reaction in response to a muscle relaxant (rocuronium, cisatracurium or atracurium), an opiate (morphine or remifentanil), or after receiving several drugs during the anaesthesia induction, and who had negative allergy tests to these drugs, were collected at the Clínica Universidad de Navarra (Table 2). These patients had already been included in previous studies1,9. All serum samples, were extracted during the onset of the allergic reaction, no later than 24 h. We also obtained 3 samples from our patients at a further time from the reaction (48 h, 1 and 2 months). Control sera from healthy individuals and from patients that underwent anaesthesia procedure with no anaphylactoid reaction were also collected. All of them are indicated in Table 2.
Ethics statement
The study was approved by the State Ethics Committee and the Ethics Research Committee of the University of Navarra. The authors performed these procedures in accordance with the approved guidelines, obtaining informed consent from each subject before conducting the experiments.
Drugs used in this study
We incubated mast cells separately with different drugs and analysed their degranulation response. Our study included several drugs which had frequently been seen to cause non-IgE-mediated immediate allergic drug reactions, including opiates (morphine from B. Braun at a dose of 10 mg/mL and remifentanil from Kern Pharma 1 mg powder), muscle relaxants (cisatracurium from Pfizer at 2 mg/mL; rocuronium from Merck Sharp Dohme at 10 mg/mL), general anaesthetics (propofol-lipuro from Braun at 10 mg/mL), NSAIDs (sodium diclofenac from Novartis at 75 mg), iodinated contrast agents (iohexol from GE Healthcare at 240 mg/mL; iomeprol from Bracco at 714.4 mg/mL; and meglumine amidotrizoate from Juste Laboratories at 280 mg/mL), and antibiotics (amoxicillin-clavulanic acid from Sandoz at 1000 mg/200 mg; vancomycin from Normon at 500 mg; and teicoplanin from Sanofi at 400 mg). We included amoxicillin-clavulanic acid as a negative control because its associated allergic reactions have often been described as IgE-dependent.
Lentivirus production and MRGPRX2 silencing
We used MRGPRX2 receptor MISSION shRNA plasmid DNA MAS-related GPR, member X2 (Sigma. St Louis. MO, USA), which had been validated previously23. The lentiviruses were produced by co-transfection with lipofectamine of the MRGPRX2-silencing sequence cloned in the pLKO.1 plasmid and the plasmids encoding the lentiviral capsid in HEK 293LTV cells. Controls were performed with a control sequence (scramble) that had proved to be harmless in protein-silencing eukaryotic cells. We proceeded as described by Ainsua-Enrich et al.24. Mast cell-positive clones were selected with puromycin (1 µg/mL), and silencing was confirmed by western blot (anti-MRGPRX2 purified mouse polyclonal antibody B02P, Abnova, Germany; and anti-α-tubulin [DM1A clone] Sigma [Sigma, St. Louis, MO, USA]) and flow cytometry (PE anti-human MRGPRX2 clone K125H4 Biolegend, San Diego, CA, USA) following the procedure described elsewhere25. FcεRI expression was analysed using mouse anti-human FcεRI-PE (eBioscience, San Diego, CA, USA), while KIT expression was evaluated using mouse anti-cKIT (Ab81 clone, Santa Cruz Biotechnology, Inc. Santa Cruz, CA, USA) and a secondary goat anti-mouse IgG antibody, Alexafluor 647 (Invitrogen Life Technologies, Carlsbad, CA, USA), using FACSCalibur flow cytometry (FACScan; BD Biosciences, Mountain View, CA, USA).
Mast cell degranulation assays
Degranulation was analyzed based on the levels of β-hexosaminidase activity at the supernatant or on CD63 expression on the cell membrane, assessed by flow cytometry, as described in previous studies24,26. β-hexosaminidase is an enzyme found inside mast cell granules and released at the supernatant after cell degranulation. CD63 is a protein found in the granules and expressed on the cell membrane after degranulation. For each type of essay, we briefly incubated 2 × 104–1 × 105 cells at 37 °C for 30 minutes with several concentrations of the drugs described earlier. For IgE-stimulation, we sensitized mast cells overnight with biotinylated IgE (Abbiotec, San Diego, CA, USA) (0.1 µg/mL), and stimulated them for 30 minutes at 37 °C with streptavidin (0.4 µg/mL) to induce IgE crosslinking. As a positive control for degranulation, we incubated the samples with ionomycin (200 µg/mL) and PMA (10 ng/mL) for 30 minutes at 37 °C.
To carry out the degranulation assays with patient sera, we incubated each serum sample with 1 × 105 mast cells in Tyrode’s buffer for 30 minutes at 37 °C, at a ratio of 1:1, for a total volume of 100 µL. Because of the colour of the serum samples, which interfered with the β-hexosaminidase colorimetric test, only flow cytometry assays with the CD63-APC marker were performed for the sera.
To rule out the drugs’ toxic effects on the cells, a viability count was also carried out in all cases, using trypan blue in the β-hexosaminidase assays and propidium iodide (PI) in the flow cytometry assays.
Statistical analysis of the results
All study data are shown as a mean value ± SEM. Multiple group comparisons were performed using one-way analysis of variance (ANOVA), followed by the Bonferroni post-hoc test. Student’s T-test with Welch’s correction was used to conduct all analyses between both groups (patients and controls). In addition, the analyses were carried out using GraphPad Prism 6. P-values < 0.05 (two-tailed) were considered statistically significant. The β-hexosaminidase assays were performed in triplicate, and all experiments were carried out at least three times. The CD63 analyses carried out by flow cytometry were also performed at least three times.
Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Change history
08 June 2021
A Correction to this paper has been published: https://doi.org/10.1038/s41598-021-91844-6
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Acknowledgements
We would like to express our deepest gratitude to the Cytomics core facility of the Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) for its technical support. Also, we wish to particularly acknowledge the patients for their participation in our study, and the biobank of the University of Navarra for its collaboration. This work was supported by the following grants: PI1200332, issued by the Fondo de Investigaciones Sanitarias; SAF2015-68124-R, issued by MINECO-FEDER (UE); and a grant issued by the Instituto de Salud Carlos III (ISCIII), co-founded by the Fondo Europeo de Desarrollo Regional (FEDER) for the Thematic Networks and Co-operative Research Centers: ARADyAL (RD16/0006/0031 and RD16/0006/0007). AN-F was supported by a grant from Fundación Gangoiti Barrera. RM-C is a recipient of a Juan Rodes Fellowship (ISCIII).
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A. Navinés-Ferrer: This author participated in the study’s conception and design, the in vitro assays, the drafting and reviewing of the article, and the final approval of the version for publication. E. Serrano-Candelas: This author participated in the study’s conception and design, the in vitro assays, the drafting and reviewing of the article, and the final approval of the version for publication. A. Lafuente and R. Muñoz-Cano: These authors participated in the study of patients allergic to anesthesia, the drafting and reviewing of the article, and the final approval of the version for publication. M. Martín: This author participated in the study’s conception and design, the in vitro assays, the drafting and reviewing of the article, and the final approval of the version for publication. G. Gastaminza: This author participated in the study’s conception and design, the study of patients allergic to anesthesia, the drafting and reviewing of the article, and the final approval of the version for publication.
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Navinés-Ferrer, A., Serrano-Candelas, E., Lafuente, A. et al. MRGPRX2-mediated mast cell response to drugs used in perioperative procedures and anaesthesia. Sci Rep 8, 11628 (2018). https://doi.org/10.1038/s41598-018-29965-8
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DOI: https://doi.org/10.1038/s41598-018-29965-8
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