Microthread-like filaments connecting the epithelial basal lamina with underlying fibrillar components of the connective tissue in the rat trachea |
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Authors: | Dr. Kojiro Wasano Torao Yamamoto |
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Affiliation: | (1) Department of Anatomy, Kyushu University, Fukuoka, Japan;(2) Department of Anatomy, Faculty of Medicine, Kyushu University, 3-1-1, Maidashi, Higashi-Ku, 812 Fukuoka, Japan |
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Abstract: | Summary The structural relationship between the basal lamina and the underlying reticular tissue was studied, with special attention to the relationship among basal lamina-associated anchoring fibrillar (AF) arcs (Kawanami et al. 1978, 1979) and other fibrillar components, in the epithelium-denuded trachea of the rat. Quantitative analysis of a large number of AF arcs reveals that the majority of the AF arcs has no other fibrillar components of passage. This suggests that most AF arcs do not serve as a real anchoring device, connecting the basal lamina with the underlying reticular tissue, as has so far been suggested by Kawanami et al. (1978). Ruthenium-red staining reveals the presence of a unique meshwork of microthread-like filaments connecting the undersurface of the basal lamina or the AF arcs with the underlying fibrillar components with a remarkable continuity, suggesting that the filaments act as a real anchoring device; these filaments link, instead of the AF arcs, the basal lamina, to the subjacent reticular tissue. Various enzymatic treatments of the filaments indicate that their chemical nature is probably non-collagenous (glyco)protein without glycosaminoglycan moieties. |
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Keywords: | Trachea Basal lamina Anchoring fibril Ruthenium red-positive filaments New anchoring device Rat |
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