The impact of EPLINα (Epithelial protein lost in neoplasm) on endothelial cells, angiogenesis and tumorigenesis.

Abstract:

BACKGROUND:EPLIN (epithelial protein lost in neoplasm) is a cytoskeletal associated protein involved in the regulation of actin dynamics and subsequently in cell motility. EPLIN expression is frequently reduced in a variety of cancer cells and tissues and this loss may account for increased invasive traits in cancer cells. The current study aimed to assess the role of EPLIN in endothelial cells and the angiogenic process. METHODS:EPLINα expression was enhanced in HECV endothelial cells through transfection with a pEF6 expression plasmid containing the full coding sequence of EPLINα. The impact of EPLINα on HECV cells was then assessed using a range of in vitro and in vivo models. RESULTS:transfection and over-expression of HECV cells with EPLINα expression plasmid resulted in a significant reduction in cell-matrix adhesion (P = 0.003), the rate of migration (P = 0.009) and tubule formation (P = 0.007) and also enhanced paxillin staining compared to transfection controls. Additionally, MDA-MB-231 breast cancer cells co-injected with HECV(EPLIN exp) cells developed at a slower rate than those co-injected with HECV(pEF6) cells (day 26, P = 0.05; day 33, P = 0.065, overall deviation over time P < 0.001). Treatment of HECV(EPLIN exp) cells with ERK inhibitor could rescue HECV cells from the inhibitory effect of EPLINα over-expression on tubule formation, returning these cells to control levels. CONCLUSIONS:EPLINα over-expression can regulate HECV cell motility, matrix adhesion and tubule formation in vitro and slow in vivo tumour formation, suggesting an anti-angiogenic role for EPLINα. Extracellular signal-regulated kinase (ERK) also appears to be linked to the ability of EPLINα to inhibit tubule formation in vitro.

journal_name

Angiogenesis

journal_title

Angiogenesis

authors

Sanders AJ,Ye L,Mason MD,Jiang WG

doi

10.1007/s10456-010-9188-7

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

317-26

issue

4

eissn

0969-6970

issn

1573-7209

journal_volume

13

pub_type

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