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• W218361346 abstract "Abstract We introduce a new method for preparing subpopulations of guinea pig megakaryocytes (MK). MK, partially purified by a density gradient, were separated according to size by sedimentation, starting as a monolayer, in an albumin gradient at unit gravity. Twenty-two fractions were collected. Cells were cytocentrifuged, ploidy was assessed by microdensitometry, and small MK were identified with anti-von Willebrand factor (vWF) immunoglobulin. Immaturity was assessed by uptake of 3H thymidine and synthesis of proteoglycans from 35S sulfate. About 88% of cells in fractions 2 through 18 were MK, of which 90% were viable. Fractions containing the largest cells were composed of 98% stage III and IV MK; fractions with the smallest cells contained up to 80% stage I and II MK. Six MK classes were isolated: immature cells, both stage I and II cells, at either the 8N, 16N or 32N ploidy class; mature cells, both stage III and IV cells, at either the 8N, 16N or 32N ploidy class. The fractions were pooled into three groups: (a) 8% of MK in group 1, fractions 2 through 11, were immature, and group 1 was composed of 92% of 16N and 32N mature classes; (b) 29% of MK in group 2, fractions 12 through 15, were immature, and group 2 was composed of 52% 16N mature, 24% 16N immature, and 13% 8N mature classes; 67% of MK in group 3, fractions 16 through 18, were immature, and group 3 contained 51% 8N immature, 14% 16N immature, and 18% mature 16N classes. The mean protein content of the three groups was 1.251, 0.624, and 0.284 mg/10(6) MK, respectively. Nine percent of cells in group 3 but no cells in group 1 took up large amounts of 3H thymidine. The synthesis of high-molecular-weight (high-mol-wt) proteoglycans in group 3 and synthesis of lower mol wt proteoglycans in groups 1 and 2 provided further evidence for differences in MK maturity. Thus, the method can isolate MK subpopulations that are viable and can be used to investigate the biochemical characteristics of MK at different phases of maturation." @default.
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• W218361346 date "1989-05-15" @default.
• W218361346 modified "2023-09-30" @default.
• W218361346 title "Characterization of guinea pig megakaryocyte subpopulations at different phases of maturation prepared with a Celsep separation system" @default.
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• W218361346 doi "https://doi.org/10.1182/blood.v73.7.1801.1801" @default.
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