Title

Monocyte chemotactic protein-induced protein (MCPIP) promotes inflammatory angiogenesis via sequential induction of oxidative stress, endoplasmic reticulum stress and autophagy

Authors

Authors

A. Roy;P. E. Kolattukudy

Comments

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Abbreviated Journal Title

Cell. Signal.

Keywords

MCPIP; ROS; ER stress; Autophagy; Angiogenesis; ENDOTHELIAL GROWTH-FACTOR; CHEMOATTRACTANT PROTEIN-1; CARDIOVASCULAR-DISEASE; TRANSCRIPTION FACTOR; NADPH OXIDASE; TUMOR-GROWTH; CHEMOKINE RECEPTOR-2; NITRIC-OXIDE; CELLS; MCP-1; Cell Biology

Abstract

Major diseases such as cardiovascular diseases, rheumatoid arthritis, diabetes, obesity and tumor growth are known to involve inflammation. Inflammatory molecules such as MCP-1, TNF-alpha, IL-1 beta and IL-8 are known to promote angiogenesis. MCP-induced protein (MCPIP), originally discovered as a novel zinc finger protein induced by MCP-1, is also induced by other inflammatory agents. MCPIP was shown to mediate MCP-1-induced angiogenesis. Whether angiogenesis induced by other inflammatory agents is mediated via MCPIP is unknown and the molecular mechanisms involved in angiogenesis induced by MCPIP have not been elucidated. The aim of this study was to bridge this gap and delineate the sequential processes involved in angiogenesis mediated via MCPIP. siRNA knockdown of MCPIP was used to determine whether different inflammatory agents, MCP-1, TNF-alpha, IL-1 beta and IL-8, mediate angiogenesis via MCPIP in human umbilical vein endothelial cells (HUVECs). Chemical inhibitors and specific gene knockdown approach were used to inhibit each process postulated. Oxidative stress was inhibited by apocynin or cerium oxide nanoparticles or knockdown of NADPH oxidase subunit, phox47. Endoplasmic reticulum (ER) stress was blocked by tauroursodeoxycholate or knockdown of ER stress signaling protein IRE-1 and autophagy was inhibited by the use of 3'methyl adenine, or LY 294002 or by specific knockdown of beclin1. Matrigel assay was used as a tool to study angiogenic differentiation induced by inflammatory agents or MCPIP overexpression in HUVECs. Tube formation induced by inflammatory agents, TNF-alpha, IL-1 beta, IL-8 and MCP-1 was inhibited by knockdown of MCPIP. Forced MCPIP-expression induced oxidative stress. ER stress, autophagy and angiogenic differentiation in HUVECs. Inhibition of each step caused inhibition of each subsequent step postulated. The results reveal that angiogenesis induced by inflammatory agents is mediated via induction of MCPIP that causes oxidative and nitrosative stress resulting in ER stress leading to autophagy required for angiogenesis. The sequence of events suggested to be involved in inflammatory angiogenesis by MCPIP could serve as possible targets for therapeutic intervention of angiogenesis-related disorders. (C) 2012 Elsevier Inc. All rights reserved.

Journal Title

Cellular Signalling

Volume

24

Issue/Number

11

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

2123

Last Page

2131

WOS Identifier

WOS:000309309100018

ISSN

0898-6568

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