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Journal of Histochemistry and Cytochemistry, Vol. 45, 1157-1164, Copyright © 1997 by The Histochemical Society, Inc.

TECHNICAL NOTE

Patterns of Hyaluronan Staining Are Modified by Fixation Techniques

Weiqi Lina, Svetlana Shusterb, Howard I. Maibacha, and Robert Sternb
a Departments of Dermatology, University of California at San Francisco, San Francisco, California
b Pathology, University of California at San Francisco, San Francisco, California

Correspondence to: Robert Stern, Dept. of Pathology, HSW-501, School of Medicine, UCSF, San Francisco, CA 94143-0506.

The apparent intensity of hyaluronan (HA) staining in tissue sections can vary as a function of fixation techniques. We examined the histochemical distribution of HA in normal human skin using an HA-specific binding peptide derived from bovine nasal cartilage. The HA, particularly in the dermis, was best preserved in sections fixed in 10% acid-formalin with 70% ethanol. In contrast, sections fixed in the routine 10% neutral-buffered formalin had a much weaker intensity of HA staining. Furthermore, acid-formalin/ethanol-fixed sections retained much of their apparent HA after incubation with saline, in contrast to the neutral formalin-fixed sections, in which most of the stainable HA was lost. Such marked differences in staining intensity were not observed in slides stained with Alcian blue, a procedure pressumed to stain HA as well as other glycosaminoglycans. Staining using the HA binding peptide was entirely absent when sections were first preincubated in hyaluronidase, whereas similar Alcian blue-stained sections retained most of their staining intensity. Caution should be exercised in evaluating the distribution of HA in tissues using the HA binding peptide, particularly when different fixation techniques among several laboratories are being compared. In addition, the ability to evaluate the HA content of tissues using Alcian blue staining should be reconsidered. The sulfated glycosaminolglycans of the "ground substance" appear to be the predominant substrates for Alcian blue. (J Histochem Cytochem 45:1157-1163, 1997)

Key Words: hyaluronan, glycosaminoglycans, fixation, human skin, Alcian blue


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