Konnyaku asthma, buckwheat asthma and mabushi asthma are well known as representative occupational bronchial asthma in Japan. "Konnyaku" asthma is an asthma caused by inhalation of "maiko", a dust from the tuberous root of devil's tongue (Amorphophalus konnyaku), which is used in the production of the Japanese food "konnyaku". Buckwheat asthma is an asthma caused by inhalation or ingestion of buckwheat powder. "Mabushi" asthma is an asthma caused by inhalation of the dried ripe larva urine from silk-worm during sericulture. Sera from these asthmatic patients were investigated for specific IgE antibodies against the three allergens, "maiko", buckwheat, and the ripe larva urine using RAST (radioallergosorbent test). The results were as follows. 1) In the patients with "konnyaku" asthma, RAST values to maiko were significantly higher than those of non-konnyaku asthmatic patients. 2) In konnyaku asthma, close correlation between the end point of maiko skin test and RAST values were obtained. 3) In the patients with buckwheat asthma, RAST values to Buckwheat powder were significantly higher than those of other asthmatic patients. 4) In the patients with "mabushi" asthma, RAST values were the highest to the ripe larva urine salted out by 50-90% saturated ammonium sulfate. Using this fraction of the ripe larva urine, RAST values in mabushi asthmatic patients are significantly higher than those of other asthmatic patients. 5) In occupational asthma (konnyaku, buckwheat and mabushi asthma), RAST was thought to be very useful for measurement of specific IgE antibodies to each allergen and also to be valuable for further purification of each allergen.
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