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トリプターゼは肥満細胞の特異的マーカーであり,ヒスタミンは肥満細胞および好塩基球などから放出されるケミカルメディエーターである。アレルギー性結膜炎(以下AC)および春季カタル(以下VC)患者の結膜上皮中のこれらの酵素の濃度を解析した。トリプターゼ,ヒスタミン濃度ともAC群およびVC群では正常群に比較して有意に高値を示した(p≦0.05)。ヒスタミン/トリプターゼ比(H/T比)は点状表層角膜炎および涙液層破壊時間と相関を示した。結膜上皮内のH/T比がアレルギー性結膜炎,春季カタルにおいて疾患のパラメーターとなりうる可能性があると考えられた。
We measured the histamine and tryptase levels in conjunctival epithelial cell suspension in children with allergic conjunctivitis and vernal keratocon-junctivitis by applying brush cytology. Both the histamine and tryptase levels were significantly higher in both diseases than controls (p<0.05).The histamine/tryptase ratio was significantly higher in vernal keratoconjunctivitis than in aller-gic conjunctivitis and controls (p<0.05). The ratio was also positively correlated with BUT (r2=0.56) and the presence of superficial punctate keratitis (r2=0.72) . Thus, the histamine/tryptase ratio in the conjunctiva promised to be a useful means in evaluating the ocular surface conditions in allergic and conjunctivitis. That the increase in histamine level was not associated with tryptase in severe vernal conjunctivitis seemed to suggest the impor-tance of inflammatory cells in the conjunctiva in this disease.
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