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• W2017448181 abstract "A lamellar body fraction was isolated from rat alveolar granular pneumocytes in primary culture by upward flotation on a discontinuous sucrose gradient and compared with a similar fraction isolated from lung homogenates. Lamellar bodies from granular pneumocytes were free of detectable contamination with either succinate dehydrogenase or NADPH-cytochrome c reductase. There was an enrichment of acid phosphatase activity, which, based on distribution of enzyme activity on the gradient, did not appear to be a contamination from other fractions. The lamellar body fraction of granular pneumocytes yielded approx. 1 μ protein/106 cells with a phospholipid-to-protein ratio (mg/mg) of 9.6 ± 0.4 (n = 7). Composition with respect to total phospholipids was 71.0% phosphatidylcholine (disaturated phosphatidylcholine, 45.2%), 8.4% phosphatidylglycerol and 12.8% phosphatidylethanolamine. Palmitic acid comprised 66% of the fatty acids in phosphatidylcholine and 34% of those in phoshatidylglycerol. The lamellar body fraction from granular pneumocytes was similar to that from whole lung with respect to phospholipid-to-protein ratio and phospholipid composition and showed only minor differences in fatty acid composition. Ultrastructurally, lamellar bodies showed generally intact limiting membranes and lamellated structure. Lamellar bodies from granular pneumocytes showed occasional multinucleated whorls which were not seen in those isolated from lung homogenates. This study describes a method for preparing a homogenous fraction of intact lamellar bodies from small amounts of material (6·107 granular pneumocytes). The yield on a per cell basis was higher when compared with a similar preparation from whole lung, although overall yield is small, due to loss of cells during the cell isolation procedure. This preparation may be useful to evaluate the role of lamellar bodies in the synthesis and secretion of lung surfactant by isolated granular pneumocytes." @default.
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• W2017448181 date "1983-08-01" @default.
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• W2017448181 title "Isolation of lamellar bodies from rat granular pneumocytes in primary culture" @default.
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• W2017448181 doi "https://doi.org/10.1016/0005-2760(83)90105-4" @default.
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