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STUDIES ON PREDICTION AND THRESHOLD LIMIT VALUES OF OCCUPATIONAL SENSITIZERS.

职业致敏因素的预测和阈值的研究。

基本信息

批准号：
03670270
负责人：
AOYAMA Kohji
金额：
$ 1.28万
依托单位：
KAGOSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03670270/
关键词：
Occupational Sensitizers Respiratory Allergy Exposure Dose-response TDI アレルギ-量ー反応関係 TMA

项目摘要

The purpose of this study was to provide the informations to establish preventive measurements for respiratory allergy from occupational sensitizers. We carried out this study recognizing the requirements of preventive measurements as below : the prediction of allergenicity, listing up of occupational sensitizers, the confirmation of dose-response relationship in hypersensitivity reactions and setting up of occupational exposure limits (OELs). We revised our drafted table exhibiting occupational sensitizers on the bases of current reports. For setting up the OELs of them, first we investigated the relationships between the induction concentration of TDI and immunological responses using our animal model. Guinea pigs were exposed via inhalation to TDI ranging from 0.02 to 1.0 ppm for 3h/day on 5 consecutive days. Three weeks later, animals were challenged via inhalation with TDI-guinea pig albumin (TDI-GSA) conjugates. Evaluations were based on TDI specific antibodies, pulmonary respons … More es (as respiratory rate) and antigen stimulated histamine releases from lung mast cells. The results indicated that both the antibody titer and the severity of pulmonary response followed induction concentration dependent fashions with corresponding threshold levels. Antibodies and pulmonary response were undetectable in animals exposed to 0.02 ppm TDI, but not in those exposure to 0.2 ppm TDI or more. The existences of antibody production and histamine release were associated closely with the elicitation of pulmonary responses, but there was not a relationship between the both. Further, to simulate occupational exposure condition, we employed 0.02 ppm TDI itself at challenge. The similar findings of pulmonary sensitivity were observed with those following the employment of conjugate, though there was weakness in the degree of pulmonary responses. These results above suggested that the current model was useful to explore dose-response relationships in pulmonary sensitivity at induction and challenge phases and that antibody production and histamine release might be indices of the exposure and development of pulmonary responses, respectively. Lastly, the flowchart to evaluate the pulmonary sensitivity and to set up the OELs of occupational sensitizers was made. Less

本研究的目的是提供资料，以建立预防措施，呼吸道过敏的职业致敏物。我们认识到预防措施的要求如下：预测变应原性，列出职业致敏物，确认超敏反应的剂量-反应关系和建立职业接触限值（OELs）。我们在现有报告的基础上修订了职业性致敏物的表格草案。为了建立它们的OEL，我们首先用我们的动物模型研究了TDI诱导浓度与免疫应答之间的关系。豚鼠通过吸入暴露于TDI，范围为0.02 - 1.0 ppm，每天3小时，连续5天。三周后，通过吸入TDI-豚鼠白蛋白（TDI-GSA）结合物激发动物。评估基于TDI特异性抗体、肺反应、肺功能和肺功能。 ...更多信息 es（如呼吸频率）和抗原刺激肺肥大细胞释放组胺。结果表明，抗体滴度和肺反应的严重程度均呈诱导浓度依赖性，并有相应的阈值水平。暴露于0.02 ppm TDI的动物中未检测到抗体和肺反应，但暴露于0.2 ppm TDI或更高剂量的动物中未检测到抗体和肺反应。抗体产生和组胺释放的存在与肺反应的激发密切相关，但两者之间无相关性。此外，为了模拟职业暴露条件，我们在挑战时使用0.02 ppm TDI本身。使用偶联物后观察到类似的肺敏感性结果，但肺反应程度较弱。上述结果表明，本模型可用于探索诱导期和激发期肺敏感性的剂量-反应关系，抗体产生和组胺释放可分别作为暴露和肺反应发展的指标。最后，提出了职业性致敏物肺敏感性评价和OEL值建立的流程图。少