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Original Article

Enzymatic Activities of Allergen Extracts from Three Species of Dust Mites and Cockroaches Commonly Found in Korean Home

Kyoung Yong Jeong1,2, Chungryul Kim2, Tai-Soon Yong2
The Korean Journal of Parasitology 2010;48(2):151-155.
Published online: June 17, 2010

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Corresponding author (tsyong212@yuhs.ac)
• Received: March 8, 2010   • Revised: April 20, 2010   • Accepted: April 21, 2010

Copyright © 2010 by The Korean Society for Parasitology

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  • Allergen extracts from dust mites and cockroaches commonly found in Korean homes were used to evaluate their enzymatic activity as they are believed to influence allergenicity. Allergen extracts were prepared from 3 dust mite species (Dermatophagoides farinae, D. pteronyssinus, and Tyrophagus putrescentiae) and 3 cockroach species (Blattella germanica, Periplaneta americana, and P. fuliginosa) maintained in the Korea National Arthropods of Medical Importance Resource Bank. Proteins were extracted in PBS after homogenization using liquid nitrogen. The activities of various enzymes were investigated using the API Zym system. No significant difference in phosphatase, lipase, or glycosidase activity was observed among the 6 allergen extracts, but much difference was observed in protease activity. Protease activity was assessed in more detail by gelatin zymography and the EnzChek assay. Extract from T. putrescentiae showed the highest protease activity, followed by those of the cockroach extracts. Extracts from D. farinae and D. pteronyssinus showed only weak protease activity. Gelatinolytic activity was detected mainly in a 30-kDa protein in D. farinae, a 28-kDa protein in D. pteronyssinus, a > 26-kDa protein in T. putrescentiae, a > 20-kDa protein in B. germanica, and a > 23-kDa protein in P. americana and P. fuliginosa. The information on various enzymatic activities obtained in this study may be useful for future studies. In particular, the strong protease activity found in cockroach extracts could contribute to sensitization to cockroach allergens, which is known to be associated with the development of asthma.
  • Key words: Dermatophagoides farinae, Dermatophagoides pteronyssinus, Tyrophagus putrescentiae, Blattella germanica, Periplaneta americana, Periplaneta fuliginosa, allergen, protease, cockroach, dust mite
Allergen extracts from dust mites and cockroaches are commercially available for diagnostic and immunotherapeutic purposes. However, heterogenicity of allergen extracts has been reported in terms of protein concentration and major allergen content leading to the variable allergenicity among manufacturers [1,2]. The Korea National Arthropods of Medical Importance Resource Bank (AMIB), housed in the Institute of Tropical Medicine, Yonsei University College of Medicine, Seoul, Korea, was established to collect, rear, and provide investigators with access to arthropods that directly or indirectly affect human health. Allergic disorders are commonly elicited by arthropods [3]. Allergen extracts prepared by the addition of protease inhibitors and 1-phenyl-3-(2-thiazolyl)-2-thiourea to prevent protein degradation and melanization were first described in 2003 [4]. Since then, allergen extracts from mites and cockroaches prepared at our resource bank have been shown to have various effects giving rise to allergic responses. Cockroach extracts were shown to induce human eosinophils to release inflammatory mediators [5] independent of serine protease activity. Furthermore, proteases from cockroach extracts were found to activate protease-activated receptor 2 (PAR-2) in human airway epithelial cells resulting in calcium oscillations [6], induce IL-8 expression in human airway epithelial cells [7], and delay barrier recovery and lamellar body secretions in murine skin [8]. Extract from the house dust mite, Dermatophagoides pteronyssinus, was shown to activate human monocytic THP-1 cells to express MCP-1, IL-6, and IL-8 independent of protease activity [9]. Mite extract was also shown to influence epidermal permeability barrier homeostasis via activation of PAR-2 [8].
Proteolytic activity is one of the major concerns when preparing allergen extracts. Proteases may degrade protein components, including major allergens, when preparing allergen extracts. However, a large body of evidence suggests that enzyme activity is directly associated with the allergenicity of allergen extracts [10]. Recently, it was shown that addition of protease inhibitors to protease-rich cockroach extracts used for diagnosis and therapy increased the shelf life of the extracts [11].
In this study, we evaluated the enzyme activities of allergen extracts prepared in the AMIB and have been provided to the Korean researchers from 3 dust mite species (Dermatophagoides farinae, D. pteronyssinus, and Tyrophagus putrescentiae) and 3 cockroach species (Blatella germanica, Periplaneta americana, and Periplaneta fuliginosa) that are commonly found in Korean homes.
Extract preparation
Mites (D. farinae, D. pteronyssinus, and T. putrescentiae) and cockroaches (B. germanica, P. americana, and P. fuliginosa) were cultured in an insect rearing facility in the AMIB, Department of Environmental Medical Biology, Yonsei University College of Medicine, Seoul, Korea, as described previously [12,13]. Frozen mites and cockroaches (30 µg each) were pulverized in liquid nitrogen, and extracts were obtained by overnight incubation with PBS containing 6 mM 2-mercaptoethanol, protease inhibitor set III (1/1,000 volume; Calbiochem, San Diego, California, USA), and 1 mg/ml 1-phenyl-3-(2-thiazolyl)-2-thiourea (Sigma-Aldrich, St. Louis, Missouri, USA) at 4℃ after defatting with ethyl ether and ethyl acetate. Thereafter, the extracts were sieved through 2 pieces of cheesecloth and centrifuged, and the insoluble matter removed by using a syringe filter (0.22 µm, Millipore, Bedford, Massachusetts, USA). The extracts were aliquoted and stored at -70℃ until use.
SDS-PAGE and enzyme activity analysis
The protein concentrations of the extracts were determined using the Bradford assay (Bio-rad, Hercules, California, USA). SDS-PAGE analysis was performed to investigate the protein profiles of the extracts. Samples were run on 10% gels under reducing conditions. Ten µg of each allergen extract was loaded on the gel and visualized by staining with Coomassie Brilliant Blue R250.
For the analysis of gelatinolytic protease activity, samples were run on 10% SDS-PAGE gels containing 0.1% gelatin. Five µg of mite extract or 1 µg of cockroach extract was loaded per well. Subsequently, the gels were incubated for 60 min in renaturing buffer (2.7% w/v Triton X-100) at room temperature and then in developing buffer (Invitrogen, Carlsbad, California, USA) overnight at 37℃. Gels were stained with Coomassie Brilliant Blue R250.
ApiZym assay
The activities of 19 different enzymes, including 5 proteases, 3 lipases, 3 phosphatases, and 8 glycosidae activities, were semiquantitatively estimated using the API Zym assay (bioMerieux, Marcy l'Etoile, France). Procedures and interpretations were followed to the manufacturer's instructions. Values ranged from - (no activity) to +++ (maximum enzymatic activity).
EnzChek assay
The protease activities of mite and cockroach extracts were compared using the EnzChek Protease Assay kit (Molecular Probes Inc., Eugene, Oregon, USA) according to the manufacturer's instructions. Tosyl-L-phenylalanine chloromethyl ketone-treated trypsin (TPCK-trypsin, Pierce, Rockford, Illinois, USA), a chymotrypsin activity-inhibited trypsin isolated from bovine pancreas, was used as a reference protease. Protease activity was measured using pH-insensitive green fluorescent BODIPY-FL-conjugated casein as a substrate in a total reaction volume of 200 µl. All enzymes and extracts were diluted in PBS (pH 7.4). After addition of 100 µl of substrate solution and 100 µl (up to 10 µg) of enzyme or extract into 96-well plates, the reaction mixtures were incubated for one hour at room temperature and protected from light. Fluorescence was read using a luminescence spectrometer (LS50B, PerkinElmer Inc., Waltham, Massachusetts, USA) at an excitation wavelength of 485 nm and an emission wavelength of 530 nm.
SDS-PAGE and gelatin zymogram analysis
Several proteins in the molecular weight range of 20-100 kDa were detected from extracts of 2 (D. farinae and D. pteronyssinus) of the 3 mite species. In contrast, proteins smaller than 25 kDa were detected only in T. putrescentiae extracts. P. americana and P. fuliginosa cockroach extracts had strongly stained protein bands in the 20-40 kDa range. A broader range of protein sizes and strongly stained protein bands in the 30-40 kDa range were visualized in B. germanica extracts (Fig. 1).
Gelatinolytic activity was detected primarily in proteins with molecular weights of 28-38 kDa in D. farinae, 28 kDa in D. pteronyssinus, 26 to > 100 kDa in T. putrescentiae, 20-23 and 60 kDa in B. germanica, and 26-33 kDa in P. americana and P. fuliginosa. Five µg of 2 Dermatophagoides spp. mite extracts produced a weak hollow in a gelatin zymogram. In contrast, 1 µg of cockroach extract produced multiple strong hollows, implying strong proteolytic activity. T. putrescentiae extract showed strong gelatinolytic activity compared to extract of Dermatophagoides spp. mites (Fig. 2).
Enzymatic activity as assessed by ApiZym and EnzChek assays
Enzymatic activities as measured by the ApiZym assay are summarized in Table 1. The results are graded as negative (-), weakly positive (+), moderately positive (++), or strongly positive (+++). All 6 extracts showed similar degrees of phosphatase and glycosidase activities but differed from protease and lipase activities. For lipases, extracts of all 6 species showed weak or moderated degree of both esterase (C4) and esterase lipase activity. However, T. putrescentiae and B. germanica exhibited weak lipase (C14) activities. In case of proteases, overall, T. putrescentiae extract showed the strongest protease activity, followed by the cockroach extracts. In particular, strong trypsin and α-chymotrypsin activities were detected in T. putrescentiae extract, but extracts from Dermatophagoides spp. mites showed no α-chymotrypsin activity and weak trypsin activity.
The caseinolytic activities of 10 µg of D. farinae, D. pteronyssinus, T. putrescentiae, B. germanica, P. americana, and P. fuliginosa extracts were equivalent to 0.048, 0.005, 0.574, 0.166, 0.124, and 0.157 µg of TPCK-trypsin, respectively, as measured by the EnzChek assay (Fig. 3). Overall, caseinolytic activities assessed by the EnzChek assay were similar with the protease activities estimated by the ApiZym assay.
Proteolytic enzymes can contribute to the development of allergic disorders [10], and elimination or reduction of protease activity preserving antigenicity of allergen extracts might be helpful when developing allergy vaccines [14]. However, enzyme activity should be preserved when investigating allergic responses and may even provide new therapeutic targets. Furthermore, allergen extraction procedure can affect the quality of the extracts. The present study report the enzyme activity of the allergen extracts prepared from AMIB, which provide allergen extracts to Korean researchers.
Previous studies demonstrated that protease allergens from fungi, house dust mites, and cockroaches play an important role in driving allergic responses by providing an adjuvant effect to the protease allergen itself as well as to bystander allergens [15-18]. Mite and cockroach proteases in particular are known to activate p44/p42 MAP kinases in human airway epithelial cells, resulting in elevated production of IL-8 [19].
Mite group 1, 3, 6, and 9 allergens and cockroach group 10 allergens are known to have protease activity, probably associated with a digestive function [20,21]. Allergen extracts with strong gelatinolytic activities have been reported to have strong allergenicities from dust mite and cockroach extracts [22]. Furthermore, various protease activities were detected in T. putreascentiae extracts, and serine protease inhibitors were shown to be able to retard mite development [23].
Recently, mechanisms by which some non-proteolytic allergens, such as Der p 2 [24,25], Der p 5 [26], and Per a 7 [27], elicit allergic responses have been investigated. However, much more effort should be devoted to studies that identify the mechanisms by which protein allergens trigger allergic responses. Insight into the interactions between allergens and immune cells might provide novel targets for the treatment of allergic disorders.
In this study, we demonstrated various enzyme activities in cockroach and mite extracts using gelatin zymography (Fig. 2), the ApiZym assay (Table 1), and the EnzChek assay (Fig. 3). There were no significant differences in phosphatase, lipase, or glycosidase activity among the 6 allergen extracts. T. putrescentiae extract showed the highest protease activity, followed by those of the cockroach extracts, while D. farinae and D. pteronyssinus extracts only had weak protease activity. The strong protease activity of cockroach extracts may play an important role in allergies to cockroach antigens, which are associated with development of asthma. Different enzymatic activities can be detected based on the use of different extraction buffers and preparation procedures. Microbes in the guts of mites and cockroaches can also influence the enzymatic activities of extracts [28,29]). Protease-activated receptor 2 is of special interest in allergic inflammation induced by protease allergens [30]. We anticipate that the enzymatic activities of mite and cockroach extracts reported in this study could be helpful for future studies, e.g., investigation of the effects of selected extracts on various immune cells.
This study was supported by a grant of the Korea Healthcare technology R&D Project, Ministry for Health, Welfare & Family Affairs, Republic of Korea (A090028).
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Fig. 1
Protein analysis of mite and cockroach extracts. Each (10 µg) allergen extract was separated on 10% SDS-PAGE. M, molecular mass marker (kDa); Df, D. farinae; Dp, D. pteronyssinus; Tp, T. putrescentiae, Bg, B. germanica; Pa, P. americana; Pf, P. fuliginosa.
kjp-48-151-g001.jpg
Fig. 2
Gelatin zymography of dust mite and cockroach extracts. Five µg for mite extracts and 1 µg of cockroach extracts were analyzed on a 10% SDS-PAGE gel containing 0.1% gelatin.
M, molecular mass marker (kDa); Df, D. farinae; Dp, D. pteronyssinus; Tp, T. putrescentiae, Bg, B. germanica; Pa, P. americana; Pf, P. fuliginosa.
kjp-48-151-g002.jpg
Fig. 3
Caseinolytic activities of dust mite and cockroach extracts as measured by the EnzChek assay. Caseinolytic activity was measured by green fluorescent dye conjugated substrate and allergen extracts (1 ng-10 µg). TPCK-trypsin, Tosyl-L-phenylalanine chloromethyl ketone-treated (chymotrypsin-activity inhibited) trypsin.
kjp-48-151-g003.jpg
Table 1.
Enzymatic activity of mite and cockroach extracts determined by the Api Zym assay
Table 1.
Enzyme
 Allergen extract
Classes Specific activity Df Dp Tp Bg Pa Pf
Proteases Leucine arylamidase + + +++ ++ ++ +++
Valine arylamidase - - ++ ++ - +
Cystine arylamidase - - + + - +
Trypsin + + +++ + ++ ++
α-Chymotrypsin - - +++ - - -
Lipases Esterase (C4) ++ ++ + + + +
Esterase lipase + ++ ++ + ++ ++
Lipase (C14) - - + + - -
Phosphatases Alkaline phosphatase ++ + ++ ++ + +
Acid phosphatase +++ +++ +++ +++ +++ +++
Naphtol-AS-BI-phosphohydrlase ++ ++ ++ ++ ++ ++
Glycosidases α-Galactosidase + ++ + + + +
β-Galactosidase +++ +++ ++ +++ +++ +++
β-Glucuronidase ++ ++ ++ +++ ++ +++
α-Glucosidase +++ +++ +++ +++ +++ +++
β-Glucosidase ++ ++ +++ + + +
N-acetyl-β-glucosaminudase ++ ++ ++ ++ ++ ++
α-Mannosidase ++ ++ + + + +
α-Fucosidase +++ +++ +++ ++ +++ ++

Df, D. farinae; Dp, D. pteronyssinus; Tp, T. putrescentiae, Bg, B. germanica; Pa, P. americana; Pf, P. fuliginosa. -, negative; +, weak positive; ++, moderate positive; +++, strong positive.

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Enzymatic Activities of Allergen Extracts from Three Species of Dust Mites and Cockroaches Commonly Found in Korean Home
Korean J Parasitol. 2010;48(2):151-155.   Published online June 17, 2010
DOI: https://doi.org/10.3347/kjp.2010.48.2.151
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Enzymatic Activities of Allergen Extracts from Three Species of Dust Mites and Cockroaches Commonly Found in Korean Home
Korean J Parasitol. 2010;48(2):151-155.   Published online June 17, 2010
DOI: https://doi.org/10.3347/kjp.2010.48.2.151
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Enzymatic Activities of Allergen Extracts from Three Species of Dust Mites and Cockroaches Commonly Found in Korean Home
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Fig. 1 Protein analysis of mite and cockroach extracts. Each (10 µg) allergen extract was separated on 10% SDS-PAGE. M, molecular mass marker (kDa); Df, D. farinae; Dp, D. pteronyssinus; Tp, T. putrescentiae, Bg, B. germanica; Pa, P. americana; Pf, P. fuliginosa.
Fig. 2 Gelatin zymography of dust mite and cockroach extracts. Five µg for mite extracts and 1 µg of cockroach extracts were analyzed on a 10% SDS-PAGE gel containing 0.1% gelatin.M, molecular mass marker (kDa); Df, D. farinae; Dp, D. pteronyssinus; Tp, T. putrescentiae, Bg, B. germanica; Pa, P. americana; Pf, P. fuliginosa.
Fig. 3 Caseinolytic activities of dust mite and cockroach extracts as measured by the EnzChek assay. Caseinolytic activity was measured by green fluorescent dye conjugated substrate and allergen extracts (1 ng-10 µg). TPCK-trypsin, Tosyl-L-phenylalanine chloromethyl ketone-treated (chymotrypsin-activity inhibited) trypsin.

Fig. 1

Fig. 2

Fig. 3

Enzymatic Activities of Allergen Extracts from Three Species of Dust Mites and Cockroaches Commonly Found in Korean Home
Enzyme
Allergen extract
Classes Specific activity Df Dp Tp Bg Pa Pf Proteases Leucine arylamidase + + +++ ++ ++ +++ Valine arylamidase - - ++ ++ - + Cystine arylamidase - - + + - + Trypsin + + +++ + ++ ++ α-Chymotrypsin - - +++ - - - Lipases Esterase (C4) ++ ++ + + + + Esterase lipase + ++ ++ + ++ ++ Lipase (C14) - - + + - - Phosphatases Alkaline phosphatase ++ + ++ ++ + + Acid phosphatase +++ +++ +++ +++ +++ +++ Naphtol-AS-BI-phosphohydrlase ++ ++ ++ ++ ++ ++ Glycosidases α-Galactosidase + ++ + + + + β-Galactosidase +++ +++ ++ +++ +++ +++ β-Glucuronidase ++ ++ ++ +++ ++ +++ α-Glucosidase +++ +++ +++ +++ +++ +++ β-Glucosidase ++ ++ +++ + + + N-acetyl-β-glucosaminudase ++ ++ ++ ++ ++ ++ α-Mannosidase ++ ++ + + + + α-Fucosidase +++ +++ +++ ++ +++ ++
Table 1. Enzymatic activity of mite and cockroach extracts determined by the Api Zym assay

Df, D. farinae; Dp, D. pteronyssinus; Tp, T. putrescentiae, Bg, B. germanica; Pa, P. americana; Pf, P. fuliginosa. -, negative; +, weak positive; ++, moderate positive; +++, strong positive.

Table 1.

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