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血小板活化因子（pfateletachvatingfactor，PAF）是一种作用强烈的致炎致敏介质，静脉注射或吸入PAF可5！起强烈的支气管收缩。研究表明，吸入过敏原后，哮喘病人支气管肺泡灌洗液中PM水平显著升高［‘］。由于pAF半衰期只有30S，极易脱酚基转变为无活性的Lyso－PAF，因此，直
Platelet-activating factor (pfateletachvatingfactor, PAF) is a potent proinflammatory sensitizing agent, intravenous or inhaled PAF 5! From the strong bronchoconstriction. Studies have shown that, after inhalation of allergens, bronchial alveolar lavage fluid PM levels were significantly increased in asthmatics [’]. Since the half-life of pAF is only 30 s, it is very easy to convert the phenol to inactive Lyso-PAF. Therefore,