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We developed a technique that permits the use of serial sections (7-20 microns) from a single fixed piece of bone tissue for immunofluorescence, measurement of fluorescent bone labels, enzyme histochemistry, and general staining. This technique combines modifications of previously established methods with perfusion of the polymer polyvinylpyrrollidone (PVP) to improve sectioning, and produces reliable sections with good preservation of both hard and soft tissues. The combination of techniques from several workers, the use of perfusion with a polymer to increase the sectionability of the bone, and the addition of a gelatin adhesive on top of pressure-sensitive adhesives represent a significant improvement over previously described methods. The sections obtained are usable for immunocytochemistry, general staining, enzyme histochemistry, and visualization of fluorescent bone labels. We have consistently used tissues prepared in this manner for immunohistochemical demonstration of neuropeptides in skeletal tissues and for localizing tartrate-resistant acid phosphatase (TRAP). In addition, other tissues obtained from PVP-perfused rats, such as brain, spinal cord, muscle, gut, and sympathetic ganglia, are also well preserved and demonstrate immunohistochemical staining comparable to and possibly superior to that obtained with normal fixation protocols.

An improved method for preparing cryostat sections of undecalcified bone for multiple uses.