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Improved method for making high-affinity sections of soft tissue embedded in polyethylene glycol (PEG): its use in screening monoclonal antibodies

JB Bard and AS Ross

This article describes improvements in the immunohistologic technique for embedding highly hydrated embryonic tissue in polyethylene glycol 1000 (PEG)--a water-soluble wax of melting point 39 degrees C--and compares the PEG sections with frozen and polyester-wax sections. The main improvement ensures that relatively large PEG sections (8 X 3 mm) stretch out and adhere well to slides: a coat of albumen and glycerine is dried onto the slides and a fresh coat applied just before use. The embedding, sectioning, and mounting procedures, which are considerably faster than those for wax processing, have been developed for screening monoclonal antibodies against the differentiated neural crest cells in the anterior eyes of 9-day-old chick embryos. PEG sections of such eyes were a little fragile, but showed good cellular detail, similar to or better than in wax sections and considerably better than in frozen sections. The responses of PEG sections to the antibodies were far stronger than those of wax and marginally better than those of frozen sections. In one experiment using 125I-labeled rabbit anti-mouse antibody on sections previously treated with antibodies or antisera, PEG sections bound about five times as much label as wax sections and approximately 30% more than frozen sections. The main limitation of the technique is that, because of the softness of PEG, it only works well for embedding a limited range of tissues. Such PEG sections may, however, be useful for in situ hybridization as well as for immunohistochemistry.

Volume 34, Issue 9, pp. 1237-1241, 09/01/1986
Copyright © 1986 by The Histochemical Society


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