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A neutral pH silver development method for the visualization of 1- nanometer gold particles in pre-embedding electron microscopic immunocytochemistry [published erratum appears in J Histochem Cytochem 1990 Sep;38(9):1396]

JJ Lah, DM Hayes and RW Burry

Department of Anatomy, Ohio State University, Columbus.

The availability of 1-nm gold particles permits the use of a particulate label with standard pre-embedding electron microscopic immunocytochemical techniques. We have employed these particles to localize a synaptic vesicle protein, p65, and a growth-associated protein, GAP-43, in neuron cell cultures. To be detected by standard transmission electron microscopy, these ultra-small gold particles must be enlarged. We have applied a commercially available silver development kit (IntenseM), the method of Danscher, and a neutral pH development procedure which we developed to effect this enlargement. Although IntenseM permits development with good preservation of morphology, it is limited by lack of reproducibility and by variability of final particle size. The method of Danscher provides well-controlled and reproducible enlargement, but is limited with respect to preservation of ultrastructural details. The neutral pH development procedure reproducibly enlarges gold particles with superior preservation of morphology. The use of this development procedure in conjunction with 1-nm gold probes should permit precise ultrastructural localization of a variety of intracellular antigens.

Volume 38, Issue 4, pp. 503-508, 04/01/1990
Copyright © 1990 by The Histochemical Society


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