Abstract
When rabbit peritoneal exudates (97% polymorphonuclear [PMN] leukocytes, 2% mononuclear cells) were fractionated by zonal sedimentation or isopycnic centrifugation, four fractions (A, B, C, and D) were obtained, as reported earlier. "A" consisted largely of PMN azurophil granules, "B" of PMN specific granules, and "D" of membranous elements. The source of the more heterogeneous "C" fraction (containing acid hydrolases) was uncertain. To gain further information on the nature of this fraction, cytochemical tests for acid phosphatase (AcPase) were carried out on the starting cells and on the fractions. In intact PMN, lead phosphate reaction product was found in Golgi complexes, perinuclear cisternae, and some azurophil granules (immature forms or disrupted mature forms) of a few cells. The specifics and the intact azurophils were not reactive. Reaction product was also found within Golgi cisternae, secondary lysosomes, and some of the azurophil granules of mononuclear cells. Observations on the A and B fractions confirmed those in situ regarding the localization of reaction product in disrupted PMN azurophils, its absence from specifics, and the latency of the enzyme activity in intact azurophils. In the C fraction, AcPase was found in three structures (a) Golgi cisternae, (b) dense bodies, and (c) small pleomorphic granules Comparison with the starting cells indicates that the Golgi complexes are probably derived from both PMN leukocytes and mononuclear cells, whereas the remaining elements resemble (in size, shape, and density) secondary lysosomes and azurophil granules of mononuclear cells. The results indicate that the bulk of the cytochemically detectable AcPase present in the C fraction is derived from mononuclear cells, rather than from PMN leukocytes
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