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Nerve/glial antigen (NG) 2 is a crucial regulator of intercellular adhesion molecule (ICAM)-1 expression.
- Source :
-
Biochimica et biophysica acta. Molecular cell research [Biochim Biophys Acta Mol Cell Res] 2018 Jan; Vol. 1865 (1), pp. 57-66. Date of Electronic Publication: 2017 Sep 28. - Publication Year :
- 2018
-
Abstract
- The proteoglycan nerve/glial antigen (NG) 2 is expressed on multiple cell types and mediates cell proliferation and migration. However, little is known about its function in gene regulation. In this study, we demonstrate that in pericytes and glioblastoma cells intercellular adhesion molecule (ICAM)-1, an essential protein for leukocyte adhesion and transmigration, underlies a NG2-dependent expression. As shown by flow cytometry, Western blot analysis and quantitative real-time polymerase chain reaction (qRT-PCR), silencing of NG2 in human placenta-derived pericytes increased the expression of ICAM-1. Pathway analyses revealed that this is mediated by extracellular-regulated-kinases (ERK) 1/2 signaling. Moreover, leukocyte adhesion to NG2 siRNA-treated pericytes was significantly enhanced when compared to scrambled (scr) siRNA-treated control cells. In vivo, we detected increased ICAM-1 protein levels in the retina of mice lacking NG2 expression. To exclude that this novel mechanism is pericyte-specific, we additionally analyzed the expression of ICAM-1 in dependency of NG2 in two glioblastoma cell lines. We found that A1207 and M059K cells exhibit an inverse expression pattern of NG2 and ICAM-1. Finally, downregulation of NG2 in A1207 cells significantly increased ICAM-1 expression. Taken together, these findings indicate that NG2 may represent a promising target for the modulation of ICAM-1-mediated immune responses.<br /> (Copyright © 2017 Elsevier B.V. All rights reserved.)
- Subjects :
- Animals
Antigens genetics
Cells, Cultured
Gene Expression Regulation
HEK293 Cells
Humans
Intercellular Adhesion Molecule-1 metabolism
Mice
Mice, Inbred C57BL
Mice, Transgenic
Proteoglycans genetics
Signal Transduction genetics
Antigens physiology
Intercellular Adhesion Molecule-1 genetics
Proteoglycans physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0167-4889
- Volume :
- 1865
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Biochimica et biophysica acta. Molecular cell research
- Publication Type :
- Academic Journal
- Accession number :
- 28964848
- Full Text :
- https://doi.org/10.1016/j.bbamcr.2017.09.019