By Rodolfo Paoletti; David Kritchevsky
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Additional resources for Advances in lipid research. Vol. 18, 1981
T o demonstrate apo-B localization Hoff and G a u b a t z (1975) followed a fixation method which began with washes in cacodylate buffer, followed by incubation of thin sections in a peroxidase localization medium and hydrogen peroxide. 2. This was followed by dehydration in graded ethanols and embedding in S p u r r ' s medium (Spurr, 1969). By using this m e t h o d , Hoff and G a u b a t z (1975) were successful in localizing apo-B in h u m a n intracranial arteries. The most significant single contribution made by electron microscopy to the understanding of the morphologic events in atherosclerosis is the characterization of the spindle cells located in the intima of atherosclerotic vessels of experimental animals as being " m o d i f i e d " smooth muscle cells (Parker, 1960; Parker and O d l a n d , 1966).
A histochemical identification of calcium oxalate described by Yasue (1969) also gives excellent results. Decalcification is occasionally necessary t o un cover the lipid core in the lesions (Vesselinovitch, 1962). d. Enzyme Histochemistry. Enzyme histochemical staining methods are 28 DRAGOSLAVA VESSELINOVITCH AND K A T T I F I S C H E R - D Z O G A also employed in the study of atherosclerosis and they are useful in studies concerned with lysosomal enzymes such as acid phosphatase, ^-glucuron idase, and acid lipase or cholesteryl esterase.
G o m o r i (1955) described the presence of nonspecific esterases o n various types of lipofuchsins and Gedigk and Bontke (1956) found esterases and acid phosphatases in a variety of lipid pigments. Lipofuchsins, including " c e r i o d , " are derived from a number of lipids or lipoproteins, probably by oxidation. It seems possible that this lipid oxidation may take place in en dothelial cells or macrophages, since most of the lipid pigments were noted within these cells. Intimal lesions may be related to progressive oxidation and accumulation of these pigments (Gonzales, 1963).