CONTRASTING RESPIRABLE QUARTZ AND KAOLIN RETENTION OF LECITHIN SURFACTANT AND EXPRESSION OF MEMBRANOLYTIC ACTIVITY FOLLOWING PHOSPHOLIPASE-A2 DIGESTION

被引:41
作者
WALLACE, WE [1 ]
KEANE, MJ [1 ]
MIKE, PS [1 ]
HILL, CA [1 ]
VALLYATHAN, V [1 ]
REGAD, ED [1 ]
机构
[1] W VIRGINIA UNIV,MORGANTOWN,WV 26506
来源
JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH | 1992年 / 37卷 / 03期
关键词
D O I
10.1080/15287399209531679
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Respirable-sized quartz, a well-established fibrogenic mineral dust, is compared with kaolin in erythrocyte hemolysis assays after treatment with saline dispersion of dipalmitoyl phosphatidylcholine, a primary phospholipid component of pulmonary surfactant. Both dusts are rendered inactive after treatment, but the membranolytic activity is partly to fully restored after treatment with phospholipase A2, an enzyme normally associated with cellular plasma membranes and lysosomes. Phospholipid-coated dusts were incubated for periods of 2-72 h at a series of applied enzyme concentrations, and the adsorbed lipid species and hemolytic activity were quantitated at each time for both dusts. Surfactant was lost more readily from quartz than from kaolin, with consequent mom rapid restoration of mineral surface hemolytic activity for quartz. Interactions of surfactant and mineral surface functional groups responsible for the mineral-specific rate differences, and implications for determining the mineral surface bioavailability of silica and silicate dusts, are discussed
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页码:391 / 409
页数:19
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