Over-expression of MAP kinase phosphatase-2 enhances adhesion molecule expression and protects against apoptosis in human endothelial cells

Al-Mutairi, Mashael and Al-Harthi, Sameer and Cadalbert, Laurence and Plevin, Robin (2010) Over-expression of MAP kinase phosphatase-2 enhances adhesion molecule expression and protects against apoptosis in human endothelial cells. British Journal of Pharmacology, 161 (4). pp. 782-798. ISSN 1476-5381 (https://doi.org/10.1111/j.1476-5381.2010.00952.x)

[thumbnail of strathprints020126]
Preview
 Text. Filename: strathprints020126.pdf
Accepted Author Manuscript
Download (1MB)| Preview

Abstract

In this study we used adenovirus infection to overexpress the dual specific phosphatase, MAP kinase phosphatase-2 (MKP-2), in human umbilical vein endothelial cells and examined inflammatory protein expression and apoptosis, two key features of endothelial dysfunction in disease. We generated an adenoviral version of MKP-2 (Adv.MKP-2) and infected HUVECs for 40 h. TNF! stimulated MAP kinase phosphorylation and protein expression was measured by Western blotting. Cellular apoptosis was assayed by FACS. Infection with Adv.MKP-2 selectively abolished TNF!-mediated JNK activation and had little effect upon ERK or p38 MAP kinase. Adv.MKP-2 abrogated COX-2 expression whilst induction of the endothelial cell adhesion molecules ICAM and VCAM, two NF"B-dependent proteins, were not affected. However, when ICAM and VCAM expression was partly reduced by blockage of the NF"B pathway Adv.MKP-2 was able to reverse this inhibition. This correlated with enhanced TNF!-induced I"B! loss, a marker of NF"B activation. TNF! in combination with NF"B blockade also increased HUVEC apoptosis; this was significantly reversed by Adv.MKP-2. Protein markers of cellular damage and apoptosis, H2AX phosphorylation and caspase-3 cleavage, were also reversed by MKP-2 overexpression.

ORCID iDs

Al-Mutairi, Mashael, Al-Harthi, Sameer, Cadalbert, Laurence and Plevin, Robin ORCID logoORCID: https://orcid.org/0000-0002-7849-1220;
CORE (COnnecting REpositories)