A METHOD FOR COLOCALIZATION OF TUBULAR LYSOSOMES AND MICROTUBULES IN MACROPHAGES - FLUORESCENCE MICROSCOPY OF INDIVIDUAL CELLS

Routinely used procedures for chemical fixation often fail to preserve delicate membrane-bounded tubular structures in a variety of cell typ es. Fixation procedures commonly employed in immunocytochemical studie s for localization of structural proteins, such as those found in cyto skeletal elements, may also degrade these tubular structures. Here we describe a proedure that preserves the elaborate tubular lysosome syst em found in stimulated macrophages and allows the subsequent immunoflu orescence localization of microtubules in the same cells. Use of this methodology permits the assessment of the spatial relationship between tubular lysosomes and microtubules in macrophages.