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Distinct roles of E2F proteins in vascular smooth muscle cell proliferation and intimal hyperplasia.


ABSTRACT: Intimal hyperplasia (IH) and restenosis limit the long-term utility of bypass surgery and angioplasty due to pathological proliferation and migration of vascular smooth muscle cells (VSMCs) into the intima of treated vessels. Consequently, much attention has been focused on developing inhibitory agents that reduce this pathogenic process. The E2F transcription factors are key cell cycle regulators that play important roles in modulating cell proliferation and cell fate. Nonselective E2F inhibitors have thus been extensively evaluated for this purpose. Surprisingly, these E2F inhibitors have failed to reduce IH. These findings prompted us to evaluate the roles of different E2Fs during IH to determine how selective targeting of E2F isoforms impacts VSMC proliferation. Importantly, we show that E2F3 promotes proliferation of VSMCs leading to increased IH, whereas E2F4 inhibits this pathological response. Furthermore, we use RNA probes to show that selective inhibition of E2F3, not global inhibition of E2F activity, significantly reduces VSMC proliferation and limits IH in murine bypass grafts.

SUBMITTER: Giangrande PH 

PROVIDER: S-EPMC1941807 | biostudies-other | 2007 Aug

REPOSITORIES: biostudies-other

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Distinct roles of E2F proteins in vascular smooth muscle cell proliferation and intimal hyperplasia.

Giangrande Paloma H PH   Zhang JianXin J   Tanner Alice A   Eckhart Andrea D AD   Rempel Rachel E RE   Andrechek Eran R ER   Layzer Juliana M JM   Keys Janelle R JR   Hagen Per-Otto PO   Nevins Joseph R JR   Koch Walter J WJ   Sullenger Bruce A BA  

Proceedings of the National Academy of Sciences of the United States of America 20070725 32


Intimal hyperplasia (IH) and restenosis limit the long-term utility of bypass surgery and angioplasty due to pathological proliferation and migration of vascular smooth muscle cells (VSMCs) into the intima of treated vessels. Consequently, much attention has been focused on developing inhibitory agents that reduce this pathogenic process. The E2F transcription factors are key cell cycle regulators that play important roles in modulating cell proliferation and cell fate. Nonselective E2F inhibito  ...[more]

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