Updates and Recent Advances on Venom Immunotherapy

Trends and hotspots on hymenoptera venom immunotherapy: a bibliometric and visualized analysis of research from 2014 to 2024

Objective

Recently, the application of hymenoptera venom immunotherapy (VIT) has been extensively studied in the medical community. Nevertheless, there are still very few bibliometric analyses devoted to this field. Therefore, this study aims to provide a comprehensive overview of the development of research in the past 11 years and clarify future research directions and trends.

Methods

From 2014 to 2024, articles related to "hymenoptera venom immunotherapy "and "Allergy" were from the core collection of Web of Science. This visual analysis included examining annual productivity, cooperation between countries and institutions, co-cited references, author and journal cooperation networks, keyword co - occurrence, and their respective clustering and trends.

Results

A total of 332 articles on the allergy caused by hymenoptera VIT were included in this study. Germany, Azienda Ospedaliera Universitaria Integrata Verona and Golden, David B K are the most productive countries and institutions respectively. Analysis of the top 10 literatures with co-citation frequency found that 4 were expert consensus and guidelines, 4 were single-center (or multi-center), open, randomized controlled trials, and 2 were systematic reviews. Keyword cluster analysis showed that wasps were identified as the primary focus of hymenoptera VIT in the past, and mastocytosis and hymenopteran venom allergy were the current research hotspots.

Conclusion

Recent studies on hymenoptera VIT have shown that today's VIT increasingly emphasizes individualized and refined treatment. However, there is a lack of evidence of multicenter randomized controlled trials (RCTs) in this field. Further investigation is warranted to bridge this research gap.

Case Report: An unusual case of cardiac anaphylaxis in the maintenance phase of vespula venom immunotherapy

Background

Cardiac involvement in anaphylaxis remains difficult to assess; however, histamine release during an anaphylactic reaction can induce functional and metabolic alterations in the myocardium. Mast cells, identified within myocardial fibers, perivascular tissue, and arterial structures, play a crucial role in systemic and cardiac anaphylaxis through the release of inflammatory mediators, including histamine, platelet-activating factor, cytokines, chemokines, tryptase, chymase, prostaglandins, and leukotrienes. Hymenoptera venom immunotherapy (VIT) is the most effective strategy for preventing systemic reactions in sensitized individuals. Although VIT is generally well tolerated, severe allergic reactions can occur, particularly during the build-up phase, while they are rare in the maintenance phase.

Case report

We present the case of a 57-year-old male with a history of severe systemic reactions (SSR) to Vespula stings who experienced cardiac anaphylaxis during the maintenance phase of VIT. He started VIT with a conventional up-dosing schedule, which was well-tolerated. However, during the third monthly maintenance dose, he developed an anaphylactic syncopal episode with a right bundle branch block (RBBB) on ECG. He was treated promptly with adrenaline, corticosteroids, and antihistamines, and his ECG normalized within 20 days.

Conclusions

This case underscores the potential cardiac involvement in anaphylaxis during VIT maintenance and highlights the need to systematically evaluate cardiovascular manifestations during anaphylaxis episodes to optimize risk assessment and management.

Venom Immunotherapy in Patients: Clinical Characteristics, Treatment Outcomes, and Real-Life Safety Data

Objectives

Venom-specific immunotherapy is recognized as the gold standard treatment for honey bee and wasp venom allergies. This study aims to evaluate the clinical characteristics and treatment outcomes of patients diagnosed with honey bee and wasp venom allergies who commenced immunotherapy.

Methods

This study encompasses data from 43 patients who presented with honey bee and wasp venom allergies at Ondokuz Mayis University and initiated venom immunotherapy (VIT). We retrospectively examined the patients' demographic characteristics, history of atopic diseases, allergy history, characteristics of honey bee and wasp venom stings, severity of reactions, laboratory values, administered treatments, and side effects.

Results

Among the 43 patients included in our study, 9 (20.9%) were female, and 34 (79.1%) were male. A history of atopic disease was present in 34.8% of the patients, and a family history in 51.1%. The severity of systemic reactions was evaluated according to Müller's classification, with grade 4 reactions being the most frequent (48.8%). Of the 43 patients who received VIT, 28 (65.1%) were treated for Apis mellifera, 9 (20.9%) for Vespula vulgaris, and 6 (14%) for both species. Twelve patients experienced side effects during VIT, leading to discontinuation in two cases due to patients' reluctance to continue. The remaining 22 patients, who were stung again during or after completing VIT, experienced milder systemic reactions.

Conclusion

This study delineates the demographic and clinical characteristics of patients with honey bee and wasp venom allergies, highlighting the efficacy of VIT treatment. Despite the occurrence of side effects related to VIT, both previous studies and our findings suggest that these side effects are not more severe than systemic reactions resulting from stings. The absence of severe systemic reactions in patients who were stung again during or after receiving VIT underscores the effectiveness of the immunotherapy.

Stinging Ant Anaphylaxis: Advances in Diagnosis and Treatment

Stinging ants represent a wide range of over 200 different species across the world, of which Solenopsis, Myrmecia, Pogonomyrmex, and Brachyponera genera account for a substantial economic and healthcare burden. S. invicta (red imported fire ant [IFA]) and M. pilosula (jack jumper ant [JJA]) are 2 species of high clinical importance, known to cause anaphylaxis in humans, with numerous reported fatalities. Diagnostic testing should be performed in patients with a history of a systemic reaction with skin testing and/or in vitro specific immunoglobulin E (IgE) testing. In vitro testing is commercially available for IFA through whole-body extract specific IgE and JJA venom-specific IgE, but not widely available for other stinging ant species. Commercial venom component testing for IFA and JJA is currently not available. Patients with a clinical history and positive specific IgE testing should undergo treatment with specific immunotherapy, which is currently available for IFA and JJA. Buildup may be performed using conventional, semi-rush, rush, or ultra-rush schedules with similar risk profiles for IFA. Optimal duration for whole=body extract immunotherapy for IFA and specific JJA venom immunotherapy is not well studied, but generally recommended for at least 3 to 5 years. Sting challenges are used in research settings, primarily to assess treatment efficacy of immunotherapy.

Allergen immunotherapy

Allergen immunotherapy (AIT) is a potentially disease-modifying therapy that is effective for the treatment of allergic rhinitis/conjunctivitis, allergic asthma and stinging insect hypersensitivity. The decision to proceed with AIT should be made on a case-by-case basis, based on a comprehensive evaluation of the patient, allergy testing and a thorough discussion with the patient about treatment goals, risks vs. benefits, and long-term commitment to the treatment plan. For those with allergic rhinitis and/or asthma, it is also important to consider individual patient factors, such as the degree to which symptoms can be reduced by avoidance measures and pharmacological therapy, the amount and type of medication required to control symptoms, the adverse effects of pharmacological treatment, and patient preferences.Since AIT is associated with a risk of anaphylaxis, it should only be prescribed by physicians who are adequately trained in the treatment of allergic conditions. Furthermore, for subcutaneous therapy, injections must be given under medical supervision in clinics that are equipped to manage anaphylaxis. In this article, we review the indications and contraindications, patient selection criteria, and details regarding the administration, safety and efficacy of AIT for allergens other than foods. Immunotherapy for food allergy will be discussed in the Oral Immunotherapy article in this supplement.

Cellular and Humoral Response After Induction of Protection and After Finishing Hymenoptera Venom Immunotherapy

Hymenoptera venom allergy (HVA) is an IgE-mediated hypersensitivity reaction caused by Hymenoptera species stings (honeybee, vespid, or ant). The only effective treatment is Hymenoptera venom immunotherapy (VIT). Our study aimed to evaluate whether humoral and cellular biomarkers measured before, during, and after honeybee VIT are associated with the success of VIT, which was assessed by the response to a sting challenge one year after finishing VIT. In this prospective study, blood biomarkers of 25 patients undergoing honeybee VIT at the referral center in Slovenia were evaluated. A controlled honeybee sting challenge confirmed successful VIT in 20 of 25 (80%) patients. Honeybee venom (HBV) recombinant allergen profiles, evaluated before the treatment, were comparable between responders and non-responders. Longitudinal follow-up, up to 1 year after finishing VIT, showed that the immune responses do not differ significantly between patients with successful VIT and treatment failure. Those responses were characterized by decreased sIgE, tIgE, and BST, whereas sIgG4 levels increased. The basophil sensitivity also significantly decreases after VIT in both groups of patients. The analyzed biomarker which correlated considerably with treatment failure was higher basophil sensitivity to allergen stimulation before VIT. Similarly, systemic adverse events (SAEs) during the build-up phase of VIT correlated with treatment failure. Our study demonstrated similar sensitization profiles, and humoral and basophil immune responses to immunotherapy, in two different well-characterized groups of patients, one with successful VIT and the other with treatment failure. Notably, only high basophil sensitivity measured before VIT and SAEs during VIT were significantly associated with VIT failure, and both have the potential to be predictors of VIT failure.

Hymenoptera venom allergy in children and adolescents

PURPOSE OF REVIEW

This review will identify and summarize the published existing data pertaining specifically to Hymenoptera venom allergy in children and adolescents, highlighting the major studies currently available on venom immunotherapy (VIT) and its prognosis in children.

RECENT FINDINGS

The current review covers the incidence and prevalence of Hymenoptera venom allergy (HVA) in children, factors influencing occurrence and severity of reactions (age, sex, comorbidities, etc.), indications to perform diagnostic tests and start VIT in children, different existing VIT protocols and their safety and efficacy.

SUMMARY

Hymenoptera venom allergy is the second most common cause of anaphylaxis in children and it considerably affects quality of life. Cutaneous reactions are the most prevalent clinical presentation in children who usually have a more favourable prognosis than adult patients. However, studies on HVA in children and adolescents are still limited. Currently VIT is the only treatment able to modify the natural history of HVA in adults as well as in children, and to protect patients from systemic reactions after subsequent stings.

Single-Domain Antibodies-Novel Tools to Study and Treat Allergies

IgE-mediated allergies represent a major health problem in the modern world. Apart from allergen-specific immunotherapy (AIT), the only disease-modifying treatment, researchers focus on biologics that target different key molecules such as allergens, IgE, or type 2 cytokines to ameliorate allergic symptoms. Single-domain antibodies, or nanobodies, are the newcomers in biotherapeutics, and their huge potential is being investigated in various research fields since their discovery 30 years ago. While they are dominantly applied for theranostics of cancer and treatment of infectious diseases, nanobodies have become increasingly substantial in allergology over the last decade. In this review, we discuss the prerequisites that we consider to be important for generating useful nanobody-based drug candidates for treating allergies. We further summarize the available research data on nanobodies used as allergen monitoring and detection probes and for therapeutic approaches. We reflect on the limitations that have to be addressed during the development process, such as in vivo half-life and immunogenicity. Finally, we speculate about novel application formats for allergy treatment that might be available in the future.

Mast Cell-Targeting Therapies in Mast Cell Activation Syndromes

PURPOSE OF REVIEW

Provide an overview of the expanding landscape of mast cell (MC)-targeting treatments in mast cell activation syndromes (MCAS).

RECENT FINDINGS

Tyrosine-kinase inhibitors (TKIs) targeting wild-type and mutated KIT can efficiently induce MC depletion. Avapritinib and midostaurin can also temper IgE-mediated degranulation. Avapritinib has been recently approved by the FDA for the treatment of indolent systemic mastocytosis (ISM). Targeting activation pathways and inhibitory receptors is a promising therapeutic frontier. Recently, the anti Siglec-8 antibody lirentelimab showed promising results in ISM. MCAS is a heterogeneous disorder demanding a personalized therapeutic approach and, especially when presenting as anaphylaxis, has not been formally captured as outcome in prospective clinical trials with TKI. Long-term safety of TKI needs to be addressed. New drugs under investigation in diseases in which non-neoplastic MCs play a pivotal role can provide important inputs to identify new efficient and safe treatments for MCAS.