Immunolocalization of protease-activated receptors in endothelial cells of splenic sinuses

Uehara Kiyoko; Uehara Akira

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Immunolocalization of protease-activated receptors in endothelial cells of splenic sinuses

机译：Immunolocalization of protease-activated receptors in endothelial cells of splenic sinuses

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The immunolocalization of protease-activated receptors (PARs) and related proteins in splenic sinus endothelial cells was examined using immunofluorescence and electron microscopy. Immunofluorescence microscopy showed that PAR1 colocalized with PAR2, PAR3, and PAR4. PAR4 colocalized with PAR3 and P2Y12. Myosin heavy chain IIA localized to the outer shape and at the base of cells, but did not colocalize with alpha-catenin. The localization of di-phosphorylated myosin regulatory light chains (ppMLC) was partially detected on the outer circumference and conspicuously at the base of cells. Macrophage migration inhibitory factor (MIF) also localized in cells. Immunogold electron microscopy revealed the localization of PAR1 on the caveolar membrane, plasma membrane, and junctional membrane of cells. PAR2 and PAR3 localized to the plasma membrane of cells. PAR4 localized to the plasma membrane, depressions in the plasma membrane, and cytoplasmic vesicles. PpMLC was detected in stress fibers, but rarely near the adherens junctions of neighboring cells. MIF localized in vesicles on the apical and basal sides of the Golgi apparatus. Electron microscopy of endothelial cells with saponin extraction showed the depression of many coated pits formed by clathrin from the plasma membrane. Stress fibers developed at the base of cells; however, few actin filaments were observed near adherens junctions. These results indicate that PARs play important roles in splenic sinus endothelial cells, such as in endothelial barrier protection and the maintenance of firm adhesion to ring fibers.

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来源
《Cell and Tissue Research》 |2021年第3期|605-615|共11页
作者
Uehara Kiyoko; Uehara Akira;
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作者单位

Fukuoka Univ, Sch Med, Dept Cell Biol, Jonan Ku, Fukuoka 8140180, Japan;

Fukuoka Univ, Sch Med, Dept Physiol, Jonan Ku, Fukuoka 8140180, Japan;

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原文格式 PDF
正文语种英语
中图分类细胞生物学;
关键词
Protease-activated receptors; Macrophage migration inhibitory factor; Myosin II; Myosin regulatory light chains;

Immunolocalization of protease-activated receptors in endothelial cells of splenic sinuses

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