BACKGROUND: Subcutaneous immunotherapy (SCIT) can induce systemic reactions (SRs) in certain patients, but the underlying mechanisms remain to be fully elucidated.
METHODS: AR patients who were undergoing standardized HDM SCIT (Alutard, ALK) between 2018 and 2022 were screened. Those who experienced two consecutive SRs were included in the study group. A control group was established, matched 1:1 by gender, age, and disease duration with the study group, who did not experience SRs during SCIT. Clinical and immunological parameters were recorded and analyzed both before SCIT and after 1 year of treatment.
RESULTS: A total of 161 patients were included, with 79 (49.07%) in the study group. The study group had a higher proportion of AR combined asthma (26.8% vs. 51.8%, p < 0.001) and higher levels of sIgE to HDM and HDM components (all p < .001). Serum IL-4 and IL-13 levels in the study group were higher than those in the control group (p < .05). The study group received a lower maintenance dosage of HDM extracts injections than control group due to SRs (50000SQ vs. 100000SQ, p < .05). After 1 year of SCIT, the VAS score, the lung function parameters of asthmatic patients over 14 years old significantly improved in both groups (all p < .05). After a 7-day exposure to 20 μg/mL HDM extracts, the percentages of Th1, Th17, Tfh10, and Th17.1 in PBMCs decreased, while the Tfh13 cells significantly increased in the study group (p < .05).
CONCLUSIONS: The type 2 inflammatory response is augmented in HDM-induced AR patients who experienced SRs during SCIT. Despite this, SCIT remains effective in these patients when administered with low-dosage allergen extracts.

BACKGROUND: Sublingual immunotherapy (SLIT) for perennial allergic rhinitis (AR) has not been extensively studied in preschoolers. We investigated the efficacy and safety of house dust mite (HDM) SLIT-tablet for children aged 1-4 years.
METHODS: Children aged 1-4 years with AR were divided into SLIT (n = 22) and control (n = 12) groups based on their guardians\' preferences. The SLIT group received a daily dose of 10,000 JAU of HDM SLIT-tablet for 12 months, whereas the control group received symptomatic treatment only.
RESULTS: The baseline median age was 41 and 34 months in the SLIT and control groups, respectively, and the median AR symptom score was 4 for both groups. Compared with baseline, the AR symptom score had decreased significantly in the SLIT group after 12 months (score: 3, p = .002), whereas it tended to increase in the control group (score: 6, p = .08). Adverse reactions to SLIT were mild and occurred in eight patients (36%). In the SLIT group, Dermatophagoides (D.) farinae-specific IgE (sIgE) levels increased during the first 6 months and decreased to baseline levels at 12 months. In the control group, D. farinae-sIgE levels had increased significantly at 12 months compared to baseline (p = .01). D. farinae-specific IgG4 and HDM IgE-blocking factor levels were significantly increased at 12 months compared to baseline in the SLIT group only (p < .001). A lower wheezing frequency was seen in the SLIT group (0.3%) compared to the control group (0.7%).
CONCLUSIONS: This pilot study demonstrated the efficacy, safety, and immunomodulatory effects of HDM SLIT-tablet in preschoolers with AR.

Objective:Neosensitizations may be occur during the allergen specific immunotherapy（AIT） due to the differences between allergen vaccine\'s content and a patient\'s molecular sensitization profile. This study investigates whether AIT with HDM extract changes the sensitization profile, whether de novo sensitization occurs, and the clinical importance of the neosensitization. Methods:Fifty-three patients with HDM allergic rhinitis ,with/without asthma, patients were received one year HDM subcutaneous AIT . Fourteen patients were recruited as control group and received only necessary medications. Serum samples were collected at baseline, 6thmoths and 12thof AIT, respectively. Serum samples were tested specific IgE against Der p, Der p 1/2/3 and Der f, Der f 1/2/3, as well as IgG4 against Der p, Der p 1/2 and Der f, Der f 1/2. VAS were collected at the time-points as well. Results:In AIT group, Der p, Der p 1/3, and Der f 1/3 specific IgE levels were significantly higher after one-year treatment, especially for Der p 3. There were 69.2%（18/26） patients whose Der p 3 specific IgE below 0.35 kU/L at baseline but became positive（>0.35 kU/L） after treatment, that is, neosensitization occurred. All tested allergen specific IgG4 level significantly increased after one year AIT treatment and the VAS declined dramatically. However, for patients with neosensitization and without neosensitization, there were no significantly changes concerning to IgG4 level and VAS. Conclusion:Patients undergoing AIT might have a risk of neosensitization to the allergen components in the vaccines. However, the clinical importance of the neosensitization remains unclear and warrants further studies.
目的：由于患者过敏原分子致敏特征和脱敏制剂组成的差异，患者可能在过敏原特异性免疫治疗中产生新的致敏。本研究探讨屋尘螨特异性免疫治疗是否会产生新的致敏，以及新的致敏的临床重要性。 方法：53例尘螨引起的过敏性鼻炎伴随或不伴随哮喘患者接受为期1年的免疫治疗，14例患者作为对照组，按需接受对症药物治疗。分别在治疗前、治疗6个月及12个月采集患者血清，检测屋尘螨、粉尘螨及其组分过敏原（Der p 1/2/3和Der f 1/2/3）特异性IgE抗体及IgG4抗体水平（Der p，Der p 1/2，Der f，Der f 1/2），同时收集3个时间点的VAS评分。 结果：免疫治疗1年后免疫治疗组患者Der p，Der p1/3及Der f 1/3特异性IgE抗体水平显著增高，尤其是Derp 3，其中69.2%（18/26）治疗前该过敏原阴性的患者转为阳性即产生新增过敏。免疫治疗组患者过敏原特异性IgG4抗体浓度1年后显著增高，VAS评分显著下降。对照组特异性IgE及IgG4抗体浓度及VAS评分和治疗前比较，无显著变化。新增致敏的患者和未新增致敏的患者比较，IgG4抗体浓度和VAS评分无显著性差异。 结论：屋尘螨特异性免疫治疗产生了新的致敏，但其临床重要性并不清楚，有待进一步研究。.

BACKGROUND: Dermatophagoides pteronyssinus and Dermatophagoides farinae belong to the family Pyroglyphidae (subfamily: \"Dermatophagoidinae\") and have the respective allergenic proteins of Der p1, Der p2, and Der p23 and Der f1 and Der f2. Euroglyphus maynei, belongs to the family Pyroglyphidae (subfamily: \"Pyroglyphinae\") and its main allergenic protein is Eur m1, a source of sensitization. Sensitization to D. pteronyssinus and D. farinae is assessed through skin tests, while sensitization to E. maynei is assessed less frequently.
OBJECTIVE: This experimental work aims to analyze the prevalence of sensitization to E. maynei in patients with respiratory allergies treated at M. Albanesi Allergy and Immunology Unit in Bari, Italy, and the sequence homology of major allergenic proteins of E. maynei with D. farinae and D. pteronyssinus was analyzed.
METHODS: In this real-life study, 65 patients were enrolled. In particular, patients with respiratory allergy were subjected to skin prick tests for common respiratory allergens, including Euroglyphus maynei. The sequence homology analysis was performed between the major allergenic proteins of E. maynei and those of D. pteronyssinus and D. farinae.
RESULTS: Sensitization to E. maynei accounts for 41.5% of patients. All patients with E. maynei sensitization had concomitant sensitization to D. farinae and D. pteronyssinus. The analysis of sequence homology of Der p1 and Der f1 proteins with the sequence of Eur m1 protein demonstrated an identity of 84.4% and 86%, respectively.
CONCLUSIONS: Nearly 50% of house dust mites-sensitized patients have a concomitant sensitization to E. maynei. The cross-sensitization could be due to Der f1, Der p1, and Eur m1 similarity.

Objective: To investigate the effects of subcutaneous immunotherapy (SCIT) on patients\' immune markers and metabolic levels in the early stage of allergen treatment, and to gain insight into the role of SCIT in regulating immune responses and metabolic levels, so as to provide reference data for the further discovery of potential biomarkers. Methods: A longitudinal study was used to include 40 subjects who underwent SCIT with dust mite allergens in the Department of Pediatrics of the First Affiliated Hospital of Guangzhou Medical University between November 2017 and February 2022, including 20 subjects each of single mite subcutaneous immunotherapy (SM-SCIT) and double mite subcutaneous immunotherapy (DM-SCIT). In this study, levels of dust mite allergen-specific antibodies and polyunsaturated fatty acid metabolism were measured before and 12 months after treatment, while pulmonary function tests were performed. The therapeutic effects of the patients were followed up by visual analogue scale (VAS), asthma control test (ACT) and total medication scores (TMS). The results were statistically analyzed using t-test and Mann-Whitney U-test. Results: After 12 months of treatment with SCIT, both groups showed a significant decrease in total VAS score (SM-SCIT:Z=-2.298, P<0.05; DM-SCIT:Z=-3.411, P<0.001); total ACT score (SM-SCIT:Z=-2.054, P<0.05; DM-SCIT:Z=-2.014, P<0.05) and total medication scores (SM-SCIT:Z=-3.799, P<0.000 1; DM-SCIT:Z=-3.474, P<0.001) were significantly higher, in addition to significantly higher MMEF75/25 values in the DM-SCIT group (t=-2.253, P<0.05). There was no significant change in sIgE in the SM-SCIT group (P>0.05), and the sIgG4 levels of the Der p, Der f, p 1, p 2, f 2, and p 21 fractions were significantly elevated (Z=-2.651, -3.771, -2.949, -2.912, -2.725, -2.128, and -3.285, respectively, all P<0.05); The sIgE of Der p 2, f 2, p 7 and p 23 fractions(Z=-2.651, -3.771, -2.949, -2.912, -2.725, -2.128, -3.285, all P<0.05) and the sIgG4 levels of the Der p, Der f, p 1, p 2, f 1, f 2, p 10, p 21 and p 23 fractions (Z=-3.808, -3.845, -3.061, -2.688, -2.464, -3.211, -2.371, -2.091, -2.427, all P<0.05) of the DM-SCIT group were significantly elevated. Metabolomics analysis showed that arachidonic acid, docosahexaenoic acid, docosapentaenoic acid, eicosapentaenoic acid, 5, 9, 12-octadecatrienoic acid, 5(S)-hydroxylated eicosatetraenoic acid, and dihomo-gamma-linolenic acid were significantly elevated at the beginning of the treatment period after SM-SCIT treatment (Z of -2.191, -2.497, -1.988, -2.090, -2.19, -2.803, -2.073, all P<0.05); 5(S)-hydroxylated eicosatetraenoic acid showed elevated and alpha-linolenic acid, eicosadienoic acid, and eicosapentaenoic acid were significantly decreased in the DM-SCIT group after treatment (Z=-1.988, -2.090, -2.497, -1.988, respectively, all P<0.05). Correlation analysis showed that arachidonic acid was significantly negatively correlated with changes in dust mite-specific IgG4 (r=-0.499, P<0.05), and that alpha-linolenic acid, 5, 9, 12-octadecatrienoic acid, and eicosapentaenoic acid were positively correlated with the ΔsIgG4 of the dust mite der p 2 (r=0.451, 0.420, 0.474, respectively; all P<0.05). Conclusion: Significant changes in allergen-specific antibody levels and polyunsaturated fatty acid metabolism levels occur during SCIT, and the two may interact and influence each other.
目的： 探讨过敏原皮下特异性免疫治疗（subcutaneous immunotherapy，SCIT）在治疗早期对患者免疫指标和代谢水平的影响，深入了解SCIT治疗在调节免疫反应和代谢水平方面的作用，为进一步发现潜在生物标志物提供参考数据。 方法： 采用纵向研究方法，纳入2017年11月至2022年2月期间于广州医科大学附属第一医院儿科接受尘螨过敏原SCIT的受试者40例，其中单螨制剂治疗（single mite subcutaneous immunotherapy，SM-SCIT）和双螨制剂（double mite subcutaneous immunotherapy，DM-SCIT）治疗受试者各20例。本研究检测了受试者治疗前和治疗12个月后的尘螨过敏原特异性抗体和多元不饱和脂肪酸代谢水平，同时进行了肺功能检查，并通过症状视觉模拟量表（visual analogue scale，VAS）、哮喘控制测试问卷（asthma control test，ACT）和用药总评分（total medication scores，TMS）对患者的疗效进行随访，采用t检验、Mann-Whitney U检验等方法进行结果统计分析。 结果： 经SCIT治疗12个月后，两组的VAS总分（SM-SCIT：Z=-2.298，P<0.05；DM-SCIT：Z=-3.411，P<0.001）显著下降；ACT总分（SM-SCIT：Z=-2.054，P<0.05；DM-SCIT：Z=-2.014，P<0.05）和总用药评分（SM-SCIT：Z=-3.799，P<0.000 1；DM-SCIT：Z=-3.474，P<0.001）显著升高，此外，双螨治疗组MMEF75/25值显著升高（t=-2.253，P<0.05）。单螨治疗组的sIgE无明显变化（P>0.05），Der p、Der f、p 1、p 2、f 2和p 21组分sIgG4水平均显著升高（Z分别为-2.651、-3.771、-2.949、-2.912、-2.725、-2.128、-3.285，P均<0.05）；双螨治疗组的 Der p 2、f 2、p 7和p 23 组分sIgE（Z分别为-1.965、-2.028、-2.406、-2.134，P均<0.05）和Der p、Der f、p 1、p 2、f 1、f 2、p 10、p 21和p 23组分sIgG4水平均显著升高（Z分别为-3.808、-3.845、-3.061、-2.688、-2.464、-3.211、-2.371、-2.091、-2.427，P均<0.05）。代谢组学分析显示，在治疗初期，SM-SCIT治疗后花生四烯酸、二十二碳六烯酸、二十二碳五烯酸、二十碳五烯酸、5，9，12-十八碳三烯酸、5（S）-羟化二十烷四烯酸、二高-γ-亚麻酸显著升高（Z分别为-2.191、-2.497、-1.988、-2.090、-2.19、-2.803、-2.073，P均<0.05）；DM-SCIT组治疗后5（S）-羟化二十烷四烯酸显示升高，α-亚麻酸、二十碳二烯酸、二十碳一烯酸显著下降（Z分别-1.988、-2.090、-2.497、-1.988，P均<0.05）。相关性分析表明，花生四烯酸与尘螨特异性IgG4的变化呈显著负相关（r=-0.499，P<0.05），α-亚麻酸、5，9，12-十八碳三烯酸、二十碳五烯酸与尘螨der p 2的ΔsIgG4（r分别为0.451、0.420、0.474，P均<0.05）呈正相关。 结论： SCIT期间过敏原特异性抗体水平和多不饱和脂肪酸代谢水平发生显著变化，并且两者之间可能相互影响、相互作用。.

暂无摘要。

OBJECTIVE: This study aimed to investigate the clinical efficacy and safety of sublingual immunotherapy (SLIT) using standardized dermatophagoides farina drops for the treatment of allergic rhinitis (AR) in children sensitized to dust mites combined with different allergens. The findings contribute to establishing a preliminary foundation for future in-depth studies on AR treatment.
METHODS: A total of 152 AR children undergoing SLIT were categorized into two groups based on serological test results: the inhalation group (dust mite combined with inhalation allergy) and the ingestion group (dust mite combined with ingestion allergy). The clinical efficacy and safety were evaluated by assessing the total nasal symptoms score (TNSS), total medication scores (TMS), visual analog scale scores (VAS scores), and the incidence of adverse reactions before treatment and after two years of treatment.
RESULTS: After two years of treatment, TNSS, TMS, and VAS scores significantly improved compared to pre-treatment values in both the inhalation and ingestion groups (p < 0.05). However, there were no significant differences in efficacy between the two groups after two years of treatment (p > 0.05). During the treatment period, only 15 cases (10.9 %, 9 cases in the inhalation group and 6 cases in the ingestion group) experienced mild adverse reactions. There was no significant difference in the incidence of adverse reactions between the two groups (p > 0.05).
CONCLUSIONS: SLIT using standardized dermatophagoides farina drops demonstrates long-term efficacy in children with AR, regardless of whether they belong to the inhalation or ingestion group, without significant differences in treatment outcomes.

BACKGROUND: It is reported that CD123 + HLA-DR- cells in PBMC are basophils, and CD203c, CD63, and FcεRI molecules are activation markers of basophils. However, little is known of CD123 + HLA-DR-cells in blood granulocytes.
OBJECTIVE: To investigate the presence of CD123 + HLA-DR- cells in the blood granulocytes and peripheral PBMC of patients with allergic rhinitis (AR), as well as the impact of allergens on the cell membrane markers of basophils.
METHODS: Flow cytometry was used to detect the expression of the membrane molecules.
RESULTS: While CD123 + HLA-DR- PBMCs are representative of basophils, their presence did not significantly change in patients with AR. In contrast, both the percentage and number of CD123 + HLA-DR- granulocytes, which make up only up to 50% of basophils, were significantly increased in patients with seasonal (sAR) and perennial AR (pAR). CD63+, CD203c+, and FcεRIα+ cells within CD123 + HLA-DR- granulocytes also showed enhanced activity in patients with AR. Allergen extracts from house dust mite allergen extract (HDME) and Artemisia sieversiana wild extract further increased the number of CD123 + HLA-DR- cells in granulocytes of sAR and pAR patients, as well as in PBMCs of pAR patients.
CONCLUSIONS: The use of CD123 + HLA-DR- granulocytes and PBMC may not be sufficient for diagnosing AR. Allergens could potentially contribute to the development of AR by influencing the number of CD123 + HLA-DR- cells, as well as the expression of CD63, CD203c, and FcεRIαin these cells.

Atopic dermatitis is a multi-pathogenic disease characterized by chronic skin inflammation and barrier dysfunction. Therefore, improving the skin\'s ability to form an epidermal barrier and suppressing the production of cytokines that induce type 2 inflammatory responses are important for controlling atopic dermatitis symptoms. (-)-Blebbistatin, a non-muscle myosin II inhibitor, has been suggested to improve pulmonary endothelial barrier function and control inflammation by suppressing immune cell migration; however, its efficacy in atopic dermatitis is unknown. In this study, we investigated whether (S)-(-)-blebbistatin O-benzoate, a derivative of (-)-blebbistatin, improves dermatitis symptoms in a mite antigen-induced atopic dermatitis model using NC/Nga mice. The efficacy of the compound was confirmed using dermatitis scores, ear thickness measurements, serum IgE levels, histological analysis of lesions, and filaggrin expression analysis, which is important for barrier function. (S)-(-)-Blebbistatin O-benzoate treatment significantly reduced the dermatitis score and serum IgE levels compared to those in the vehicle group (p < 0.05). Furthermore, the histological analysis revealed enhanced filaggrin production and a decreased number of mast cells (p < 0.05), indicating that (S)-(-)-blebbistatin O-benzoate improved atopic dermatitis symptoms in a pathological model. In vitro analysis using cultured keratinocytes revealed increased expression of filaggrin, loricrin, involucrin, and ceramide production pathway-related genes, suggesting that (S)-(-)-blebbistatin O-benzoate promotes epidermal barrier formation. Furthermore, the effect of (S)-(-)-blebbistatin O-benzoate on type 2 alarmin cytokines, which are secreted from epidermal cells upon scratching or allergen stimulation and are involved in the pathogenesis of atopic dermatitis, was evaluated using antigens derived from mite feces. The results showed that (S)-(-)-blebbistatin O-benzoate inhibited the upregulation of these cytokines. Based on the above, (S)-(-)-blebbistatin O-benzoate has the potential to be developed as an atopic dermatitis treatment option that controls dermatitis symptoms by suppressing inflammation and improving barrier function by acting on multiple aspects of the pathogenesis of atopic dermatitis.

BACKGROUND: Human IgE (hIgE) mAbs against major mite allergen Der p 2 developed using human hybridoma technology were used for IgE epitope mapping and analysis of epitopes associated with the hIgE repertoire.
OBJECTIVE: We sought to elucidate the new hIgE mAb 4C8 epitope on Der p 2 and compare it to the hIgE mAb 2F10 epitope in the context of the allergenic structure of Der p 2.
METHODS: X-ray crystallography was used to determine the epitope of anti-Der p 2 hIgE mAb 4C8. Epitope mutants created by targeted mutagenesis were analyzed by immunoassays and in vivo using a human high-affinity IgE receptor (FcεRIα)-transgenic mouse model of passive systemic anaphylaxis.
RESULTS: The structure of recombinant Der p 2 with hIgE mAb 4C8 Fab was determined at 3.05 Å. The newly identified epitope region does not overlap with the hIgE mAb 2F10 epitope or the region recognized by 3 overlapping hIgE mAbs (1B8, 5D10, and 2G1). Compared with wild-type Der p 2, single or double 4C8 and 2F10 epitope mutants bound less IgE antibodies from allergic patients by as much as 93%. Human FcεRIα-transgenic mice sensitized by hIgE mAbs, which were susceptible to anaphylaxis when challenged with wild-type Der p 2, could no longer cross-link FcεRI to induce anaphylaxis when challenged with the epitope mutants.
CONCLUSIONS: These data establish the structural basis of allergenicity of 2 hIgE mAb nonoverlapping epitopes on Der p 2, which appear to make important contributions to the hIgE repertoire against Der p 2 and provide molecular targets for future design of allergy therapeutics.