Abstract
A method for embedding Pneumocystis carinii in hydrophilic resin (London Resin White) has been developed for immunocytochemistry studies. Using high osmotic pressure (about 850 mosmol) from fixation to embedding, this method improved the preservation of the fine structure as well as the antigenicity of rabbit- and SCID mouse-derived P. carinii. Cytochemistry studies were performed using colloidal gold-conjugated lectins (concanavalin A, glycine max, Ulex europaeus) that reacted with the cytoplasmic components (endoplasmic reticulum, Golgi vesicles). Colloidal gold-conjugated streptavidin was also tested and was found to be reactive with the parasite cell wall and cytoplasmic components, which precludes its indiscriminate use in P. carinii immunocytochemistry studies.
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