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Localization and quantitation of anionic charge sites in fetal and neonatal alveolar basement membranes

TB Ferrara, SP Sisson and RL Vernier

A method utilizing biopsy sized samples of lung for anionic charge site localization in alveolar and capillary basement membranes in human tissue is discussed. Tissue fixed in either paraformaldehyde-lysine- periodate or 1% paraformaldehyde with 0.05% glutaraldehyde, cut into 30 mu sections, and incubated with the cationic probe, polyethyleneimine, was processed for electron microscopic analysis using standard techniques. Anionic charge sites were identified and regularly distributed in increments of approximately 40-50 nm in the lamina rara externa of the alveolar basement membrane, with lesser amounts found in the lamina rara interna and lamina densa. Anionic charge sites were also demonstrated in the interstitial portion of the capillary basement membrane and on cell surfaces. These methods can be used to more broadly define the localization of anionic charge sites in human lung tissue in both normal and pathologic states.

Volume 33, Issue 6, pp. 611-614, 06/01/1985
Copyright © 1985 by The Histochemical Society


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