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รังนกเป็นสารก่อภูมิเเพ้ได้ หรือเป็น Allergens
ดังนั้น ข้ออ้างของจีนโบราณที่บอกว่าดีกับคนที่เป็นภูมิเเพ้
หรือเป็นโรคหลอดลม เป็นโรคปอดกินเเล้วดีไม่จริงหรอกค่ะ
ดีไม่ดี บางคนอาจเเพ้ทำให้อาการของโรคเเย่ลงเเละเป็นอันตรายได้
http://www.sciencedirect.com/science/article/pii/S0091674901971805
Original Articles: Food and Drug Reactions and Anaphylaxis
Immunochemical characterization of edible birds nest allergens
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Denise Li Meng Goh MMed (Paeds), MRCPa, Kaw Yan Chua PhDa, Fook Tim Chew PhDa, Teck Keong Seow PhDb, Ke Li Ou PhDb, Fong Cheng Yi BSc (Hons)a and Bee Wah Lee MDa
From athe Department of Paediatrics, National University of Singapore, and bBioprocessing Technology Centre, National University of Singapore, Singapore.
Received 3 July 2000; revised 12 December 2000. Available online 9 May 2002.
Abstract
Background: We have previously described anaphylaxis induced by edible birds nest (BN) and demonstrated that this condition is IgE mediated. Objectives: This study aimed at describing the immunochemical properties of the BN allergens. Comparative studies between 3 commercially available sources (according to the country of origin) of BN were also made. Methods: Crude extracts of commercially available processed BN from Sarawak (Malaysia), Thailand, and Indonesia and fresh unprocessed BN from the caves of Sarawak were obtained by means of aqueous extraction. Specific IgE toward these sources were determined by using fluorescence allergosorbent tests (FASTs). Cross-reactivity studies between the 3 sources of commercially available processed BN were carried out by means of FAST inhibition. Immunochemical characterization by means of IgE immunoblot, periodate treatment, and heat stability studies were carried out on fresh unprocessed BN from Sarawak. Results: Serum from allergic patients showed differences in IgE binding to the 3 sources of commercially available BN, with the highest levels of specific IgE recorded with the Sarawak source (P < .0001). Of these, only the Sarawak and Thailand sources showed considerable cross-reactivity. Further work on the unprocessed fresh Sarawak source identified a putative 66-kd major allergen containing several isoforms. Periodate treatment resulted in loss of IgE binding. Despite a progressive decline in the molecular weights of allergens on SDS-PAGE with increasing periods of boiling, IgE binding, as assessed by means of FAST, was not affected. N-terminal sequence of the major putative allergen (66 kd) showed homology to a domain of an ovoinhibitor precursor in chicken (SWISS-PROT accession No. P10184). Conclusions: We have described the immunochemical properties of BN allergens. Edible BN from different sources are allergenically dissimilar. The putative major allergen is a 66-kd protein. (J Allergy Clin Immunol 2001;107:1082-8.)
*1 Supported by grant funding from the Academic Research Fund, National University of Singapore (RP 3981317
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