Binding and uptake of pulmonary surfactant protein (SP-A) by pulmonary type II epithelial cells.
Binding and uptake of pulmonary surfactant protein (SP-A) by pulmonary type II epithelial cells.
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肺 II 型上皮细胞对肺表面活性蛋白 (SP-A) 的结合和摄取。
DOI:
--
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发表时间:
1989
影响因子:
3.2
通讯作者:
J. Whitsett
中科院分区:
文献类型:
--
作者:
R. Ryan;R. Morris;W. Rice;G. Ciraolo;J. Whitsett
A glycoprotein of Mr 26-36,000 (SP-A) is an abundant phospholipid-associated protein in pulmonary surfactant. SP-A enhances phospholipid reuptake and inhibits secretion by Type II epithelial cells in vitro. We have used two electron microscopic cytochemical methods to demonstrate selective binding and uptake of SP-A by rat pulmonary Type II epithelial cells. Using an immunogold bridging technique, we showed that SP-A binding was selective for Type II cell surfaces. Binding was dose dependent and saturable, reaching maximal binding at approximately 10 ng/ml. On warming to 23 degrees C, SP-A binding sites were clustered in coated pits on the cell surface. To characterize the internalization and intracellular routing of SP-A, we used the biotinyl ligand-avidin-gold technique. Biotinyl SP-A was bound by rat Type II epithelial cells as described above. On warming, biotinyl SP-A was seen in association with coated vesicles and was subsequently located in endosomes and multivesicular bodies. Biotinyl SP-A-gold complexes were seen in close approximation to lamellar bodies 10-60 min after warming. Binding of biotinyl SP-A was inhibited by competition with unlabeled SP-A. These results support the concept that Type II epithelial cells bind and internalize SP-A by receptor-mediated endocytosis. This newly described uptake system may play a role in the recycling of surfactant components or mediate the actions of SP-A on surfactant phospholipid secretion.
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DOI:
10.1177/32.1.6690597
发表时间:
1984
期刊:
The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society
影响因子:
--
作者:
Morris,RE;Saelinger,CB
通讯作者:
Saelinger,CB
DOI:
10.1016/s0021-9258(18)95731-5
发表时间:
1985-12
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
J. Whitsett;G. Ross;T. Weaver;W. Rice;C. Dion;W. Hull
通讯作者:
J. Whitsett;G. Ross;T. Weaver;W. Rice;C. Dion;W. Hull
DOI:
--
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Jacobs,H;Jobe,A;Ikegami,M;Jones,S
通讯作者:
Jones,S
DOI:
10.1042/bj2400679
发表时间:
1986
期刊:
The Biochemical journal
影响因子:
--
作者:
Thakur,NR;Tesan,M;Tyler,NE;Bleasdale,JE
通讯作者:
Bleasdale,JE
DOI:
10.1073/pnas.84.1.66
发表时间:
1987-01-01
影响因子:
11.1
作者:
HAWGOOD, S;BENSON, BJ;WHITE, RT
通讯作者:
WHITE, RT