Identification of the major allergen of Macrobrachium rosenbergii (giant freshwater prawn)

Objective To characterize the major allergens of Macrobrachium rosenbergii (giant freshwater prawn). Methods Raw and cooked extracts of the giant freshwater prawn were prepared. The IgE reactivity pattern was identified by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblotting technique with the sera of 20 skin prick test (SPT) positive patients. The major allergen identified was then characterized using the proteomics approach involving a combination of two-dimensional (2-DE) electrophoresis, mass spectrometry and bioinformatics tools. Results SDS-PAGE of the raw extract showed 23 protein bands (15-250 kDa) but those ranging from 40 to 100 kDa were not found in the cooked extract. From immunoblotting experiments, raw and cooked extracts demonstrated 11 and 5 IgE-binding proteins, respectively, with a molecular mass ranging from 15 to 155 kDa. A heat-resistant 36 kDa protein was identified as the major allergen of both extracts. In addition, a 42 kDa heat-sensitive protein was shown to be a major allergen of the raw extract. The 2-DE gel fractionated the prawn proteins to more than 50 different protein spots. Of these, 10 spots showed specific IgE reactivity with patients' sera. Matrix assisted laser desorption/ionization-time of flight (MALDI-TOF) analysis led to identification of 2 important allergens, tropomyosin and arginine kinase. Conclusions It can be concluded that the availability of such allergens would help in component-based diagnosis and therapy of prawn allergies.

Identification of the major allergen of Macrobrachium rosenbergii (giant freshwater prawn)

Objective: To characterize the major allergens of Macrobrachium rosenbergii (giant freshwater prawn). Methods: Raw and cooked extracts of the giant freshwater prawn were prepared. The IgE reactivity pattern was identified by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblotting technique with the sera of 20 skin prick test (SPT) positive patients. The major allergen identified was then characterized using the proteomics approach involving a combination of two-dimensional (2-DE) electrophoresis, mass spectrometry and bioinformatics tools. Results: SDS-PAGE of the raw extract showed 23 protein bands (15-250 kDa) but those ranging from 40 to 100 kDa were not found in the cooked extract. From immunoblotting experiments, raw and cooked extracts demonstrated 11 and 5 IgE-binding proteins, respectively, with a molecular mass ranging from 15 to 155 kDa. A heat-resistant 36 kDa protein was identified as the major allergen of both extracts. In addition, a 42 kDa heat-sensitive protein was shown to be a major allergen of the raw extract. The 2-DE gel fractionated the prawn proteins to more than 50 different protein spots. Of these, 10 spots showed specific IgE reactivity with patients’ sera. Matrix assisted laser desorption/ionization-time of flight (MALDI-TOF) analysis led to identification of 2 important allergens, tropomyosin and arginine kinase. Conclusions: It can be concluded that the availability of such allergens would help in component-based diagnosis and therapy of prawn allergies.

Identification of the major allergen of Macrobrachium rosenbergii (giant freshwater prawn)

<p><b>OBJECTIVE</b>To characterize the major allergens of Macrobrachium rosenbergii (giant freshwater prawn).</p><p><b>METHODS</b>Raw and cooked extracts of the giant freshwater prawn were prepared. The IgE reactivity pattern was identified by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblotting technique with the sera of 20 skin prick test (SPT) positive patients. The major allergen identified was then characterized using the proteomics approach involving a combination of two-dimensional (2-DE) electrophoresis, mass spectrometry and bioinformatics tools.</p><p><b>RESULTS</b>SDS-PAGE of the raw extract showed 23 protein bands (15-250 kDa) but those ranging from 40 to 100 kDa were not found in the cooked extract. From immunoblotting experiments, raw and cooked extracts demonstrated 11 and 5 IgE-binding proteins, respectively, with a molecular mass ranging from 15 to 155 kDa. A heat-resistant 36 kDa protein was identified as the major allergen of both extracts. In addition, a 42 kDa heat-sensitive protein was shown to be a major allergen of the raw extract. The 2-DE gel fractionated the prawn proteins to more than 50 different protein spots. Of these, 10 spots showed specific IgE reactivity with patients' sera. Matrix assisted laser desorption/ionization-time of flight (MALDI-TOF) analysis led to identification of 2 important allergens, tropomyosin and arginine kinase.</p><p><b>CONCLUSIONS</b>It can be concluded that the availability of such allergens would help in component-based diagnosis and therapy of prawn allergies.</p>

Establishment and analysis of saliva two dimensional gel electrophoresis profiles of Type 2 diabetes patients / 重庆医科大学学报

Objective:The purpose of this study was to establish two dimensional gel electrophoresis(2-DE) profiles of saliva of Type 2 diabetes patients,and to identify the differential proteomic expressions between normal persons and Type 2diabetes patients.Methods:Samples of saliva protein were separated by two dimensional electrophoresis with optimization.Differential proteomic expressions between the Type 2diabetes patients and the normal control persons were identified by two dimensional polyacrylamide gel electrophoresis,silver staining,image master 2-DE software analysis,peptide mass fingerprinting based on matrix assisted laser desorption/ionization time of flight mass spectrometry(MALDI-TOF-MS),Bioworks and NCBI software database searching.Results:The two dimensional polyacrylamide gel electrophoresis profiles of saliva proteins were successfully established by 2-DE.twenty of the significant differential proteins were selected and identified by MALDI-TOF-MS.seven of them were finally identified.Conclusions:The 2-DE profiles of saliva proteins were established and the differential proteomic expressions were identified by proteome technique in our study.This can be an experimental basis for further research of the pathogenesis and treatment of Type 2 diabetes.