Evidence that exogenous substances can be phagocytized by alveolar epithelial cells and transported into blood capillaries

被引:108
作者
Kato, T
Yashiro, T
Murata, Y
Herbert, DC
Oshikawa, K
Bando, M
Ohno, S
Sugiyama, Y
机构
[1] Jichi Med Sch, Div Pulm Med, Dept Med, Minami Kawachi, Tochigi 3290498, Japan
[2] Fukuoka Univ, Fac Sci, Dept Chem, Jonan Ku, Fukuoka 8140108, Japan
[3] Univ Texas, Hlth Sci Ctr, Dept Cellular & Struct Biol, San Antonio, TX 78229 USA
[4] Jichi Med Sch, Dept Anat, Div Histol & Cell Biol, Minami Kawachi, Tochigi 3290498, Japan
关键词
alveolar macrophage; polystyrene latex beads; lecithin; uptake; rat (Sprague Dawley);
D O I
10.1007/s00441-002-0647-3
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Since the ability of alveolar epithelial cells to ingest inhaled fine particles has not been characterized in detail, the present study seeks to evaluate this physiological activity. We used a 0.2% suspension of intact or lecithin-coated polystyrene latex beads (240 nm in diameter). A 5-ml suspension of intact or lecithin-coated latex beads was intratracheally administered to rats using a compressor nebulizer. Thereafter, the lungs were perfused intratracheally with glutaraldehyde solution and cut into small pieces. The samples were postfixed with osmium tetroxide, embedded in epoxy resin and examined under an electron microscope. Both lecithin-coated and uncoated beads were incorporated into alveolar macrophages. Some of the ingested beads in the alveolar macrophages were sequestered within lysosomes. Types I and II alveolar epithelial cells selectively incorporated only lecithin-coated beads, which were also observed within the cytoplasm of monocytes in the capillary lumen. These findings suggest that alveolar epithelial cells can incorporate exogenous particles, which are then transferred from the alveoli to intravascular spaces by transcytosis.
引用
收藏
页码:47 / 51
页数:5
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