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Advisor(s)
Abstract(s)
A classificação das bagas goji como superalimento, devido essencialmente
à sua composição em compostos bioativos, levou a um enorme
aumento do seu consumo nos países ocidentais. Apesar de todos os seus
benefícios, as bagas goji comportam alguns riscos, nomeadamente o de
alergia. Neste estudo pretendemos caracterizar as proteínas (proteoma)
das bagas goji (Lycium barbarum) e identificar aquelas envolvidas na reação
alérgica (aquelas que se ligam às imunoglobulinas de tipo E- IgE).
Assim, primeiramente procedemos à separação das proteínas das bagas
goji por eletroforese bidimensional em gel de poliacrilamida, seguida da
sua identificação por espectrometria de massa. Subsequentemente, testámos
a reatividade de indivíduos alérgicos ao tomate e batata (alimentos
da mesma família das bagas goji, Solanaceae) contra as proteínas das
bagas goji realizando para tal um ensaio de Western blot. Realizámos também
um ensaio de inibição onde a reatividade cruzada entre as bagas goji
e o tomate e a batata foi avaliada. Finalmente, caracterizámos as proteínas
de ligação às IgE realizando para tal um ensaio de Western blot com
plasmas de indivíduos alérgicos à batata e tomate, após separação das
proteínas das bagas goji por eletroforese bidimensional em gel de poliacrilamida.
Foram identificados por espectrometria de massa 93, dos 180,
spots retirados do gel, correspondendo a 29 funções proteicas. Destas,
11 corresponderam a proteínas de ligação às IgE. Demonstrámos igualmente,
neste estudo, existir reatividade cruzada entre as bagas goji, o
tomate e a batata.
Goji berries’ bioactive compounds, which allowed classifying them as superfruits, led to an enormous increase of its consumption in western countries. However, the potential risk of allergy is a concern. In this study, we aimed to characterize the proteome of goji berries (Lycium barbarum) and identify proteins with putative role in the allergic reaction (IgE-binding proteins). We firstly used two dimensional (2D) gel electrophoresis followed by mass spectrometry (MS) to characterize goji berries’ proteome, and then Immunoblot reactivity with plasma from tomato and potato (same botanical family, Solanaceae) allergic individuals was assessed to characterize goji berries IgE-binding proteins. An inhibition assay was further performed to evaluate cross-reactivity among potato, tomato and goji berries. We significantly identified 93 out of the 180 MS analyzed spots, corresponding to 29 protein functions. From these, 11 could be identified as goji berries IgE-binding proteins. We further demonstrated cross-reactivity between goji berries, tomato and potato
Goji berries’ bioactive compounds, which allowed classifying them as superfruits, led to an enormous increase of its consumption in western countries. However, the potential risk of allergy is a concern. In this study, we aimed to characterize the proteome of goji berries (Lycium barbarum) and identify proteins with putative role in the allergic reaction (IgE-binding proteins). We firstly used two dimensional (2D) gel electrophoresis followed by mass spectrometry (MS) to characterize goji berries’ proteome, and then Immunoblot reactivity with plasma from tomato and potato (same botanical family, Solanaceae) allergic individuals was assessed to characterize goji berries IgE-binding proteins. An inhibition assay was further performed to evaluate cross-reactivity among potato, tomato and goji berries. We significantly identified 93 out of the 180 MS analyzed spots, corresponding to 29 protein functions. From these, 11 could be identified as goji berries IgE-binding proteins. We further demonstrated cross-reactivity between goji berries, tomato and potato
Description
Keywords
Bagas Goji Lycium barbarum) Potencial Alérgico Proteoma Superalimentos Composição dos Alimentos
Pedagogical Context
Citation
Boletim Epidemiológico Observações. 2021 janeiro-abril;10(29):52-56
Publisher
Instituto Nacional de Saúde Doutor Ricardo Jorge, IP
