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Am J Physiol Lung Cell Mol Physiol 280: L1266-L1272, 2001;
1040-0605/01 $5.00
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Vol. 280, Issue 6, L1266-L1272, June 2001

Macrophage and type II cell catabolism of SP-A and saturated phosphatidylcholine in mouse lungs

Okyanus Gurel, Machiko Ikegami, Zissis C. Chroneos, and Alan H. Jobe

Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229

Type II cells and macrophages are the major cells involved in the alveolar clearance and catabolism of surfactant. We measured type II cell and macrophage contributions to the catabolism of saturated phosphatidylcholine and surfactant protein A (SP-A) in mice. We used intratracheally administered SP-A labeled with residualizing 125I-dilactitol-tyramine, radiolabeled dipalmitoylphosphatidylcholine ([3H]DPPC), and its degradation-resistant analog [14C]DPPC-ether. At 15 min and 7, 19, 29, and 48 h after intratracheal injection, the mice were killed; alveolar lavage was then performed to recover macrophages and surfactant. Type II cells and macrophages not recovered by the lavage were subsequently isolated by enzymatic digestion of the lung. Radioactivity was measured in total lung, lavage fluid macrophages, alveolar washes, type II cells, and lung digest macrophages. Approximately equal amounts of 125I-dilactitol-tyramine-SP-A and [14C]DPPC-ether associated with the macrophages (lavage fluid plus lung digest) and type II cells when corrected for the efficiency of type II cell isolation. Eighty percent of the macrophage-associated radiolabel was recovered from lung digest macrophages. We conclude that macrophages and type II cells contribute equally to saturated phosphatidylcholine and SP-A catabolism in mice.

dipalmitoylphosphatidylcholine; cell isolation; residualizing label; surfactant protein A


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