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Review

House Dust Mite Allergy and the Der p1 Conundrum: A Literature Review and Case Series

1
Respiratory Diseases and Lung Transplant Unit, Department of Medical and Surgical Sciences & Neurosciences, Siena University Hospital, Viale Bracci 1, 53100 Siena, Italy
2
Respiratory Medicine Unit, Department of Clinical and Experimental Sciences, University of Brescia, 25123 Brescia, Italy
3
U.O.S.A. Allergology, Department of Medical Sciences, Siena University Hospital, 53100 Siena, Italy
*
Author to whom correspondence should be addressed.
Submission received: 20 February 2021 / Revised: 1 April 2021 / Accepted: 12 April 2021 / Published: 15 April 2021

Abstract

:
The house dust mite (HDM) is globally ubiquitous in human habitats. Thirty-two allergens for Dermatophagoides farinae and 21 for Dermatophagoides pteronyssinus have been detected so far. The present minireview summarizes information about the role of Der p 1 as a key coordinator of the HDM-induced allergic response and reports on a series of Italian patients who are allergic to HDMs. We studied the specific IgE profiles in a population of patients with allergic asthma and rhinitis screened for specific immunotherapy (SIT) for HDM allergies, with the aim of obtaining insights into the pathogenic role of Der p1. Patients co-sensitized to other airborne allergens showed a higher prevalence of asthma (9/12 (75%) vs. 2/7 (29%); p < 0.05) than did HDM mono-sensitized patients. The latter group showed higher Der p1 concentrations than that of the co-sensitized group (p = 0.0360), and a direct correlation between Der p1 and Der p2 (r = 0.93; p = 0.0003) was observed. In conclusion, our study offers insights into the role of Der p1 in a population of patients with allergic rhinitis and asthma who were candidates for SIT. Interestingly, Der p1 positivity was associated with bronchial asthma and co-sensitization.

1. Literature Review

The house dust mite (HDM) is globally ubiquitous in human habitats. It is considered the main indoor allergen cause of allergic rhinitis and asthma [1]. At total of 600 million people suffer from allergic rhinitis and 200 million cases are concomitant with asthma, as reported by The World Health Organization (WHO) [2,3]. Allergies are common in 50% of all adult asthmatic patients, and up to 85% of them are allergic to HDMs, independent of differences in geography, temperature, and humidity [3].
According to the WHO position paper [4,5], the best approach to allergic rhinitis consists in allergen avoidance, pharmacotherapy (including antihistamines, leukotriene receptor antagonists, and inhaled/intranasal corticosteroids), and allergen immunotherapy. Allergen immunotherapy has been used in selected patients for 50 years to achieve clinical tolerance to causative allergens through administration of allergen extracts. It is effective in alleviating the symptoms of allergic rhinitis and/or asthma and in improving quality of life. Allergen immunotherapy has been used in selected patients to achieve clinical tolerance to allergens through exposure of patients to different amounts of allergen extracts in order to modify the immune system’s response [6,7].
The main HDM species include Dermatophagoides pteronyssius (Der p), Dermatophagoides farina (Der f), and Blomia tropicalis, which coexist in most geographical regions [8]. Group 1 (Der p 1, Der f1), group 2 (Der p 2, Der f 2), and group 23 (Der p 23) are considered the dominant allergens [9,10,11].
Twenty-one group 1 allergens have been found to have protease activity that can destroy epithelial tight junctions. Thirty-two group 2 allergens may mimic the effect of Toll-like receptor 4 coreceptor MD-2, and new ones are still being reported [12,13]. In group 23, a new allergen has been identified as a main allergen, a gut-derived peritrophin in the outer membrane of mite feces. This allergen reacts with IgE antibodies in 74% of patients allergic to Der p [13,14].
The first aim of the present study was to summarize the information about the role of Der p1 as a key coordinator of the HDM-induced allergic response. The second aim was to investigate a series of Italian patients allergic to HDM who were screened for anti-HDM treatment in order to establish the role of specific IgE in Der p groups measured by ImmunoCAP 250.
In 1980, Chapman and Platts-Mills were the first to isolate the HDM allergen Der p 1 [8]. Der p 1 has been associated with different paradigms over the past 30 years [15,16,17,18,19,20,21].
Der p 1 is a papain-like cysteine protease [10,12]. It is considered to be not only the most abundant HDM allergen in house dust and mite cultures but also a powerful allergenic protein [15,22,23]. High levels of IgE specific for this protease have been developed by more than 80% of patients allergic to HDMs [15,24,25,26].
In the last 10 years, several authors identified in vitro the protease precursors of the mite cysteine (Der p1) and serine (Der p 3, Der p 6, and Der p 9) protease precursors [27,28,29,30]. The crystal structure of Der p 1 demonstrates that this allergen is a papain-like cysteine protease, while sequence homologies and protease inhibition assays have shown that Der p 3, Der p 6, and Der p 9 belong to the trypsin-like, chymotrypsin-like, and collagenolytic-like serine protease families, respectively [31]. Der p1, 3, 6, and 9 are synthesized as pre-zymogens, consisting of a signal peptide needed for secretion and an N-terminal propeptide, followed by the mature protease domain. The expression of prosequences inhibit the respective proteases to prevent cell toxicity. Literature data reported the role of Der p 1 as the “maestro” in the maturation processes of the different HDM protease allergens [15,16,17]. The behavior of Der p1 appears to be rather uncommon in the protease world and depends on specific sequences at the C-terminus of the different propeptides [32]. Although the biological roles of these proteases in mites have not been completely unraveled, the allergens probably have a digestive function for the mite, as they are detected in the gut as well as in mite feces.
The proteolytically active HDM allergens have a critical role in the initiation of an allergic response. The elucidation of the maturation pathways of these allergens is required and could provide insights into their proteolytic specificities. Moreover, the corresponding protein substrates on the innate target and adaptive immune cells will need to be identified. The initial simplistic representation of Der p 1 as an HDM-digestive cysteine protease with IgE-binding properties has been replaced by a much more complex scenario [26,32]. Recent evidence shows a pivotal role of Der p 1 in the maturation of HDM serine protease allergens, suggesting that Der p 1 protein substrates could shape the allergenic potential of HDM proteins. Huge progress has highlighted the key role of environmental and microbial adjuvant factors in activation of innate immune pathways that are essential for the development of allergic responses [33,34,35,36]. These factors combine with the intrinsic biological activity of the allergens, which stimulates innate immune pathways, leading to allergy.
Different mechanisms influence the proteolytic activity of HDM allergens in the development of the allergic response, including cleavage of lung epithelium surfactant proteins (SP-A, SP-D) [37], tight junction protein occludins, and immune receptors expressed by dendritic [38], B [39], and T [40] cells; activation of damage-associated molecular patterns (DAMPS) [41] and protease-activated receptors (PARs) expressed on airway epithelial cells [42]; and inactivation of protease inhibitors such as α1-antitrypsin [43]. Altogether, cleavage of these cell receptors and secreted proteins by HDM proteases influences the development of allergic sensitization and may exacerbate allergic inflammation by promoting a pro-Th2 environment and/or by downregulating Th1/Treg differentiation [44].
However, the different cell pathways triggered by active Der p 1 are still unclear due to the difficulty of isolating natural Der p 1, free of serine protease contamination, from HDM allergen extracts Accordingly, these limitations stimulated research into the contribution of Der p 1 protease activity in developing a HDM-induced allergic response by means of papain, a structurally similar cysteine protease that is considered to be a surrogate for Der p 1 and HDM allergen extracts, in the presence or absence of cysteine protease inhibitors. Kubo M. reported that proteolytically active papain stimulates an innate cell network (IL-33–ILC-2–IL-13 axis) that can trigger eosinophilia in patients with early airway inflammation in the absence of specific IgE production [45]. It is intriguing to speculate that a similar mechanism could be activated by Der p 1. Cayrol et al. showed than Der p 1 can regulate the cytokine activity of alarmin IL-33 through cleavage of its sensor domain [46].
Controversial data exist on the capacity of Der p 1 to activate PAR-2 (not commonly activated by cysteine proteases), leading to proinflammatory cytokine release. The finding may have been due to residual HDM serin protease contamination of Der p 1. Recently, Der p 1 was shown to indirectly stimulate PAR-1/PAR-4 signaling pathways through thrombin, their canonical activator [47].
Bioinformatic tools and peptide substrate libraries are useful for predicting potential new targets of Der p 1 in the human cell-surface proteome, targets that could play a role in allergic airway inflammation [17,43]. Besides the capacity of Der p 1 to cleave IL-10 and IL-12 receptors, offering a new pathway for promotion of Th2-polarization, Der p 1 can cleave cell-surface inflammatory receptors (including IL-2 type II, IL-17, IL-18, and IL-23), suggesting that it is involved in a complex balance of pro- and anti-inflammatory effects [48].
Many questions still remain about the possibility of Der p 1 being a digestive enzyme and of its role as a potent activator of other mite allergens and innate immune pathways. However, the drastic effect on allergen content and release from mite fecal pellets through the protease activity of Der p1 confirms the role of Der p 1 as a key coordinator of the HDM-induced allergic response.

2. Case Series

Sensitization to mite allergens in the first years of life has a significant impact on lung function in pediatric populations who suffer from wheezing and has been associated with poorer long-term clinical outcomes. This might explain why the approach advocated by current guidelines for allergic rhinitis (AR) (ARIA, Allergic Rhinitis and its Impact on Asthma) [49] and allergic asthma (GINA, Global Initiative for Asthma) [50] classifies disease based on the severity of symptoms, often leaving the underlying allergic cause unaddressed.

2.1. Aim

The present study analyzed the specific IgE profiles in a population of patients with allergic asthma who were undergoing rhinitis anti-HDM treatment, with the aim of obtaining insights into the pathogenic role of Der p 1 (Figure 1).
All patients gave written informed consent to participate in the study, which was approved by the local ethics committee C.E.A.V.S.E. (code number 180712; Markerlung 17431).

2.2. Methods

A total of 38 patients (M/F: 20/18; median (interquartile range, IQR) age 35 (26–40) years) were screened: eight were mono-sensitized to HDM, 13 were co-sensitized to other airborne allergens, and the others were co-sensitized to other allergens. Fifteen (39.4%) had asthma and the other 23 (60%) had allergic rhinitis. Specific IgE for Der p 1, Der p 2, Der p 10, and Der p 23 were measured by ImmunoCAP 250 (Thermo-Fisher Scientific, Uppsala, Sweden) as previously reported [51]. Levels >0.35 kU/L were considered positive. From August 2019, nineteen patients (M/F: 13/6; median (IQR) age 32 (27–40) years) were enrolled for anti-HDM treatment. The inclusion criteria were persistent allergic rhinitis (moderate-to-severe) to dust mites, despite the use of symptomatic medications, and dust mite allergic asthma not well controlled by inhaled corticosteroids, associated with mild-to-severe dust mite allergic rhinitis. Seven of nineteen patients were mono-sensitized to HDM and 12 were co-sensitized to other airborne allergens. Twelve (63.1%) had asthma. Nasal symptoms (runny nose/nasal drip, nasal congestion/stuffiness, sneezing, and itchy nose) were tallied as the total nasal symptom score (TNSS; max. 12) expressed as median ± standard deviation.

2.3. Results

The prevalence of rhinitis and/or asthma did not show gender or age differences. TNSS was 7.82 ± 0.51 before starting the anti-HDM treatment. Patients co-sensitized to other airborne allergens showed a higher prevalence of asthma (9/12 (75%) vs. 2/7 (29%); p < 0.05) than did HDM mono-sensitized patients. The latter group showed higher Der p1 concentrations than that of the co-sensitized group (p = 0.0360), and a direct correlation between Der p1 and Der p2 (r = 0.93; p = 0.0003) was observed.
An AR exacerbation responder was defined as a patient with no AR exacerbations during the 8-week efficacy evaluation period. All of our patients were classified as responders to anti-HDM treatment (based on the above definition of responders) and seven of them (17%) reached a one-year follow-up. The other ones continued to be followed beyond one year.

2.4. Discussion

Our study reports on a cohort of patients screened for anti-HDM treatment. This treatment has been available in Italy since June 2019 and was recently decreed to be free of charge for Tuscan residents. Our data showed a predominance of Der p1 in co-sensitized patients before therapy. Pioneering studies showed that Der p 1 is not only the most abundant allergen from mite fecal pellets but also a major inducer of the IgE response in patients with HDM allergies [17,52]. Although Der p 1 is mainly present in the mite digestive tract, its actual biological function (in relation to the development of asthma and rhinitis) is still unclear. Literature data highlighted the pivotal role of Der p 1 in the maturation of HDM serine protease allergens, suggesting the allergenic potential of HDM proteins could be shaped by the processing of protein substrates [32]. As the first allergen characterized, Der p 1 was naturally chosen to develop a general paradigm for predicting protein allergenicity based on protease activity. Proteolytic activities have subsequently been demonstrated by biochemical and structural characterization of Der p 1 [12,17]. Great progress in immunology concomitantly evidenced the role of environmental and microbial factors in activation of innate immune pathways, which are essential for the development of allergic responses [21,23,46]. Taken together, the Der p 1 paradigm inevitably shifted to a more broadly applicable model of protein allergenicity: the allergy is caused by the association of intrinsic biological activity of an allergen along with its ability to stimulate innate immune pathways. The cysteine protease activity of Der p1 promotes a Th2-allergic response, even if the elucidation of different cell pathways triggered by active Der p 1 is still challenging. Future studies will involve solving the technical problem of isolating natural Der p 1 from HDM allergen extracts (isolation from serine protease contamination or preparation in reproducible batches).
Chevigné A et al. suggested potential new targets for Der p 1 in the human cell-surface proteome. These could play a role in allergic airway inflammation [17]. The increased concentrations of Der p1 and the high prevalence of asthma in our co-sensitized HDM patients before treatment with anti-HDM treatment suggest that underlying severe inflammation supports allergic airway diseases.
In conclusion, our study offers insights into the role of Der p groups in a population of patients with allergic rhinitis and asthma who were candidate for specific immunotherapy. Interestingly, Der p1 positivity was associated with bronchial asthma and co-sensitization.

Funding

This research received no external funding.

Institutional Review Board Statement

The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Local Ethical Committee of Comitato Etico Regione Toscana Area Vasta Sud Est (C.E.A.V.S.E.) (protocol code 17431, 15-06-2020).

Informed Consent Statement

Written informed consent has been obtained from the patient(s) to publish this paper.

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. A summary of the aim and main results of the present study, including the biological role of Der p1.
Figure 1. A summary of the aim and main results of the present study, including the biological role of Der p1.
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MDPI and ACS Style

d’Alessandro, M.; Bergantini, L.; Perrone, A.; Cameli, P.; Beltrami, V.; Alderighi, L.; Pini, L.; Bargagli, E.; Saletti, M. House Dust Mite Allergy and the Der p1 Conundrum: A Literature Review and Case Series. Allergies 2021, 1, 108-114. https://0-doi-org.brum.beds.ac.uk/10.3390/allergies1020008

AMA Style

d’Alessandro M, Bergantini L, Perrone A, Cameli P, Beltrami V, Alderighi L, Pini L, Bargagli E, Saletti M. House Dust Mite Allergy and the Der p1 Conundrum: A Literature Review and Case Series. Allergies. 2021; 1(2):108-114. https://0-doi-org.brum.beds.ac.uk/10.3390/allergies1020008

Chicago/Turabian Style

d’Alessandro, Miriana, Laura Bergantini, Anna Perrone, Paolo Cameli, Valerio Beltrami, Lorenzo Alderighi, Laura Pini, Elena Bargagli, and Marco Saletti. 2021. "House Dust Mite Allergy and the Der p1 Conundrum: A Literature Review and Case Series" Allergies 1, no. 2: 108-114. https://0-doi-org.brum.beds.ac.uk/10.3390/allergies1020008

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