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
J. Whitsett
中科院分区:
生物学3区
文献类型:
--
作者:
R. Ryan;R. Morris;W. Rice;G. Ciraolo;J. Whitsett

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一种分子量为26- 36,000的糖蛋白(SP-A)是肺表面活性物质中丰富的磷脂相关蛋白。SP-A在体外增强II型上皮细胞的磷脂再摄取并抑制其分泌。我们已经使用了两种电子显微镜细胞化学方法,以证明选择性结合和吸收的SP-A大鼠肺II型上皮细胞。使用免疫金桥接技术,我们表明,SP-A结合是选择性的II型细胞表面。结合具有剂量依赖性和饱和性,在约10 ng/ml时达到最大结合。在升温至23摄氏度时,SP-A结合位点聚集在细胞表面的包被凹坑中。为了表征SP-A的内化和细胞内路由,我们使用生物素配体-亲和素-金技术。如上所述,生物素基SP-A被大鼠II型上皮细胞结合。在升温,生物素SP-A被视为与包被囊泡,随后位于内体和多泡体。生物素SP-A-金复合物在加热后10-60分钟观察到接近板层体。生物素SP-A的结合受到未标记SP-A竞争的抑制。这些结果支持了II型上皮细胞通过受体介导的内吞作用结合并内化SP-A的概念。这种新描述的摄取系统可能在表面活性剂组分的再循环中发挥作用,或介导SP-A对表面活性剂磷脂分泌的作用。
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.
细胞内运输的可视化:生物素化配体与抗生物素蛋白-金胶体的结合使用。
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
3 日龄、10 日龄和成年兔的表面活性剂磷脂酰胆碱来源、通量和周转时间。
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
暴露于肺表面活性剂的 II 型肺细胞中脂质合成发生改变。
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