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Exposure to allergens of different cattle breeds and their relevance in occupational allergy.

Heutelbeck AR, Junghans C, Esselmann H, Hallier E, Schulz TG - Int Arch Occup Environ Health (2009)

Bottom Line: Using sera in immunoblotting experiments distinct bands were found for all symptomatic farmers, even in 13 farmers with a negative result in commercially available serological allergy tests.One of our most striking results was that 32% of the investigated farmers with cattle related symptoms showed negative results with commercial serological tests but distinct reactions with cow allergen in immunoblotting experiments.These results strongly support the following recommendation: test results with commercial extracts that are contradictory to the clinical symptoms should be supplemented by skin tests using extracts of the hair of the farmers' own cattle.

View Article: PubMed Central - PubMed

Affiliation: Department of Occupational Health, Georg-August-University, Waldweg 37, Göttingen, Germany. aheutel@gwdg.de

ABSTRACT

Introduction: Cattle are an important source of allergens in the working area of farmers. Asthma caused by cow allergens is a significant occupational problem. Yet in allergological testing, the results of in vivo and in vitro diagnostic tests are often inconsistent even in cases with clearly cattle-related symptoms.

Objectives and methods: The aim of this study was to investigate four different commercial cow allergen extracts and to compare them with self prepared extracts of different cattle breeds by means of SDS-PAGE and immunoblotting using the sera of 42 German farmers with asthma and rhino-conjunctivitis caused by cattle contact.

Results: The commercial extracts investigated in this study showed only minor differences in protein pattern. Using sera in immunoblotting experiments distinct bands were found for all symptomatic farmers, even in 13 farmers with a negative result in commercially available serological allergy tests. Bands with molecular weights in the range between about 11 and 67 kDa were observed; reactivity with the major allergen Bos d 2 at about 20 kDa was detected in all farmers, although it was not the strongest band in all cases.

Conclusions: We demonstrate for the first time the allergenic relevance of additional proteins with molecular weights of 14, 30, 55 and approx. 67-97 kDa in more than 50% of farmers with cattle related symptoms. One of our most striking results was that 32% of the investigated farmers with cattle related symptoms showed negative results with commercial serological tests but distinct reactions with cow allergen in immunoblotting experiments. The Bos d 2 content in hair showed differences between certain breeds whereas German Brown and Simmental had particularly higher quantities of Bos d 2 in their hair than breeds such as Holstein-Friesian. These results strongly support the following recommendation: test results with commercial extracts that are contradictory to the clinical symptoms should be supplemented by skin tests using extracts of the hair of the farmers' own cattle.

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Immunoblot of commercial and self prepared extract with a human serum (RAST-class 5). Commercial and self prepared extracts were separated using SDS-PAGE, blotted and developed with the serum of a farmer. The following marker and samples were applied: lane 1 molecular weight marker, lane 2 commercial extract A, lane 3 commercial extract B, lane 4 commercial extract C, lane 5 commercial extract D, lanes 6, 7 self prepared extract from German Simmental. The following amounts of protein were applied: lanes 2–6: 20 μg, lane 7: 60 μg
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Fig4: Immunoblot of commercial and self prepared extract with a human serum (RAST-class 5). Commercial and self prepared extracts were separated using SDS-PAGE, blotted and developed with the serum of a farmer. The following marker and samples were applied: lane 1 molecular weight marker, lane 2 commercial extract A, lane 3 commercial extract B, lane 4 commercial extract C, lane 5 commercial extract D, lanes 6, 7 self prepared extract from German Simmental. The following amounts of protein were applied: lanes 2–6: 20 μg, lane 7: 60 μg

Mentions: In all four commercial extracts, two major bands with a molecular weight of 18 and 20 kDa showed a specific reaction with the antibodies in all sera investigated (Figs. 1, 2, 3, and 4). Some sera showed a reaction with proteins of a molecular weight of about 14 kDa (Fig. 4). Using the serum of a highly cattle-sensitized farmer the reactivity was very high with all four commercial extracts at a MW of about 11 kDa (Fig. 4).Fig. 1


Exposure to allergens of different cattle breeds and their relevance in occupational allergy.

Heutelbeck AR, Junghans C, Esselmann H, Hallier E, Schulz TG - Int Arch Occup Environ Health (2009)

Immunoblot of commercial and self prepared extract with a human serum (RAST-class 5). Commercial and self prepared extracts were separated using SDS-PAGE, blotted and developed with the serum of a farmer. The following marker and samples were applied: lane 1 molecular weight marker, lane 2 commercial extract A, lane 3 commercial extract B, lane 4 commercial extract C, lane 5 commercial extract D, lanes 6, 7 self prepared extract from German Simmental. The following amounts of protein were applied: lanes 2–6: 20 μg, lane 7: 60 μg
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2746899&req=5

Fig4: Immunoblot of commercial and self prepared extract with a human serum (RAST-class 5). Commercial and self prepared extracts were separated using SDS-PAGE, blotted and developed with the serum of a farmer. The following marker and samples were applied: lane 1 molecular weight marker, lane 2 commercial extract A, lane 3 commercial extract B, lane 4 commercial extract C, lane 5 commercial extract D, lanes 6, 7 self prepared extract from German Simmental. The following amounts of protein were applied: lanes 2–6: 20 μg, lane 7: 60 μg
Mentions: In all four commercial extracts, two major bands with a molecular weight of 18 and 20 kDa showed a specific reaction with the antibodies in all sera investigated (Figs. 1, 2, 3, and 4). Some sera showed a reaction with proteins of a molecular weight of about 14 kDa (Fig. 4). Using the serum of a highly cattle-sensitized farmer the reactivity was very high with all four commercial extracts at a MW of about 11 kDa (Fig. 4).Fig. 1

Bottom Line: Using sera in immunoblotting experiments distinct bands were found for all symptomatic farmers, even in 13 farmers with a negative result in commercially available serological allergy tests.One of our most striking results was that 32% of the investigated farmers with cattle related symptoms showed negative results with commercial serological tests but distinct reactions with cow allergen in immunoblotting experiments.These results strongly support the following recommendation: test results with commercial extracts that are contradictory to the clinical symptoms should be supplemented by skin tests using extracts of the hair of the farmers' own cattle.

View Article: PubMed Central - PubMed

Affiliation: Department of Occupational Health, Georg-August-University, Waldweg 37, Göttingen, Germany. aheutel@gwdg.de

ABSTRACT

Introduction: Cattle are an important source of allergens in the working area of farmers. Asthma caused by cow allergens is a significant occupational problem. Yet in allergological testing, the results of in vivo and in vitro diagnostic tests are often inconsistent even in cases with clearly cattle-related symptoms.

Objectives and methods: The aim of this study was to investigate four different commercial cow allergen extracts and to compare them with self prepared extracts of different cattle breeds by means of SDS-PAGE and immunoblotting using the sera of 42 German farmers with asthma and rhino-conjunctivitis caused by cattle contact.

Results: The commercial extracts investigated in this study showed only minor differences in protein pattern. Using sera in immunoblotting experiments distinct bands were found for all symptomatic farmers, even in 13 farmers with a negative result in commercially available serological allergy tests. Bands with molecular weights in the range between about 11 and 67 kDa were observed; reactivity with the major allergen Bos d 2 at about 20 kDa was detected in all farmers, although it was not the strongest band in all cases.

Conclusions: We demonstrate for the first time the allergenic relevance of additional proteins with molecular weights of 14, 30, 55 and approx. 67-97 kDa in more than 50% of farmers with cattle related symptoms. One of our most striking results was that 32% of the investigated farmers with cattle related symptoms showed negative results with commercial serological tests but distinct reactions with cow allergen in immunoblotting experiments. The Bos d 2 content in hair showed differences between certain breeds whereas German Brown and Simmental had particularly higher quantities of Bos d 2 in their hair than breeds such as Holstein-Friesian. These results strongly support the following recommendation: test results with commercial extracts that are contradictory to the clinical symptoms should be supplemented by skin tests using extracts of the hair of the farmers' own cattle.

Show MeSH
Related in: MedlinePlus