Rapid Change in FcεRI Occupancy on Basophils After Venom Immunotherapy Induction
Abstract
1. Introduction
2. Results
2.1. VIT Induction Is Well-Tolerated
2.2. VIT Induction Reduces IgE Occupancy on Basophils but Does Not Increase sFcεRI Serum Levels
n = 19 | Before VIT | After VIT Induction | p-Value |
---|---|---|---|
Tryptase (µg/L) | 5.6 (4.5) | 5.5 (4.6) | 0.07 |
Total FcεRI | 215,426.0 ± 124,803.3 | 208,180.9 ± 130,439.8 | 0.17 |
Unoccupied FcεRI | 5360.2 ± 4588.1 | 6028.2 ± 4163.8 | 0.04 * |
Ratio of unoccupied/total FcεRI | 0.017 (0.06) | 0.023 (0.06) | <0.01 ** |
sFcεRI (ng/mL) | 0.58 (0.3) | 0.47 (0.28) | <0.01 ** |
2.3. Significant Changes in Unoccupied FcεRI Density Is Primarily Seen in Patients with Low Baseline Numbers of Unoccupied FcεRI on Their Basophils
2.4. BAT Sensitivity Does Not Significantly Change During VIT Induction for Most Patients
2.5. Changes in BAT Sensitivity Correlate with Total FcεRI Expression on Basophils
3. Discussion
4. Materials and Methods
4.1. Patients
4.2. Clinical and Laboratory Assessments
4.3. Patient Grouping
4.4. Basophil Activation Test (BAT) and Flow Cytometry
4.5. FcεRI Expression of Basophil Profile Measurements
4.6. Soluble FcεRI Measurement
4.7. Statistical Analyses
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
BAT | Basophil activation test |
EC50 | Half-maximum basophil activation |
HaT | Hereditary alpha tryptasemia |
HVA | Hymenopter venom allergy |
SCIT | Subcutaneous specific immunotherapy |
VIT | Venom immunotherapy |
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High Unoccupied FcεRI (n = 9) | Low Unoccupied FcεRI (n = 10) | p-Value | |
---|---|---|---|
Total IgE (U/mL) | 37 (49) | 98.5 (126) | 0.01 ** |
Wasp sIgE (U/mL) a | 2.0 (1) (n = 6) | 2.0 (2) (n = 7) | 0.39 |
Bee sIgE (U/mL) a | 10.5 (-) (n = 3) | 6.7 (-) (n = 3) | 0.83 |
∆ Before–After VIT | High Unoccupied FcεRI (n = 9) | p-Value (Before/After) | Low Unoccupied FcεRI (n = 10) | p-Value (Before/After) | p-Value (Between the Groups) |
---|---|---|---|---|---|
∆ Tryptase (µg/L) | 0.3 (1.35) | 0.63 | 0.42 ± 0.52 | 0.03 * | 0.55 |
∆ Total FcεRI | 8212.97 ± 21,146.54 | 0.28 | 6373.87 ± 23,995.24 | 0.42 | 0.86 |
∆ Unoccupied FcεRI | 299.27 (909.7) | 0.44 | −1224.43 ± 1083.77 | <0.01 ** | 0.05 * |
∆ Ratio unoccupied/total FcεRI | −0.003 (0.03) | 0.14 | −0.005 ± 0.004 | <0.01 ** | 1.00 |
∆ sFcεRI (ng/mL) | 0.138 ± 0.12 | <0.01 ** | 0.093 ± 0.96 | 0.01 * | 0.19 |
Correlation Coefficients | Wasp (n = 10) | Bee (n = 5) | All (n = 15) | |||
---|---|---|---|---|---|---|
∆ EC50 (µg/mL) | p-Value | ∆ EC50 (µg/mL) | p-Value | ∆ EC50 (µg/mL) | p-Value | |
∆ Total FcεRI | −0.733 | 0.02 * | −0.800 | 0.10 | −0.768 | <0.01 ** |
∆ Unoccupied FcεRI | −0.742 | 0.01 * | 0.600 | 0.29 | −0.104 | 0.71 |
∆ Ratio of unoccupied/total FcεRI | −0.292 | 0.41 | 0.800 | 0.10 | 0.268 | 0.33 |
HVA Patients (n = 19) | |
---|---|
Age (y) | 46.32 ± 15.1 |
Sex (f, %) | 7 (36.8) |
BMI (kg/m2) | 26.53 ± 3.36 |
Mastocytosis (pos., %) | 0 (0) |
HaT (pos., %) | 1 (5.3) |
Other concomitant allergies (pos., %) | 5 (35.71) |
Total IgE (U/mL) | 46.0 (76) |
Hymenoptera sensibilization (n, %) | |
Wasp | 10 (52.6) |
Bee | 5 (26.3) |
Both | 4 (21.1) |
Anaphylaxis (grade, %) | |
I | 2 (10.5) |
II | 14 (73.7) |
III | 3 (15.8) |
IV | 0 (0) |
Desensitized venom (n, %) | |
Wasp | 13 (68.4) |
Bee | 6 (31.6) |
Desensitization Protocol (n, %) | |
Ultra-rush | 12 (63.2) |
Rush | 1 (5.3) |
Cluster | 6 (31.6) |
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Puxkandl, V.; Aigner, S.; Burner, T.; Lackner, A.; Moñino-Romero, S.; Kimeswenger, S.; Hoetzenecker, W.; Altrichter, S. Rapid Change in FcεRI Occupancy on Basophils After Venom Immunotherapy Induction. Int. J. Mol. Sci. 2025, 26, 7511. https://doi.org/10.3390/ijms26157511
Puxkandl V, Aigner S, Burner T, Lackner A, Moñino-Romero S, Kimeswenger S, Hoetzenecker W, Altrichter S. Rapid Change in FcεRI Occupancy on Basophils After Venom Immunotherapy Induction. International Journal of Molecular Sciences. 2025; 26(15):7511. https://doi.org/10.3390/ijms26157511
Chicago/Turabian StylePuxkandl, Viktoria, Stefan Aigner, Teresa Burner, Angelika Lackner, Sherezade Moñino-Romero, Susanne Kimeswenger, Wolfram Hoetzenecker, and Sabine Altrichter. 2025. "Rapid Change in FcεRI Occupancy on Basophils After Venom Immunotherapy Induction" International Journal of Molecular Sciences 26, no. 15: 7511. https://doi.org/10.3390/ijms26157511
APA StylePuxkandl, V., Aigner, S., Burner, T., Lackner, A., Moñino-Romero, S., Kimeswenger, S., Hoetzenecker, W., & Altrichter, S. (2025). Rapid Change in FcεRI Occupancy on Basophils After Venom Immunotherapy Induction. International Journal of Molecular Sciences, 26(15), 7511. https://doi.org/10.3390/ijms26157511