Journal
JOURNAL OF VASCULAR SURGERY
Volume 36, Issue 2, Pages 361-370Publisher
MOSBY-ELSEVIER
DOI: 10.1067/mva.2002.124364
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Funding
- NHLBI NIH HHS [HL57908, HL60903] Funding Source: Medline
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In this study, we postulated that acute mechanical strain of the arterial wall induces changes in syndecan-4 expression that in turn may modulate cellular events, which promote neointima formation. Correlative in vivo and in vitro studies were performed to determine whether: (1) balloon injury of the rat carotid artery induces spatially and temporally regulated changes in syndecan-4 messenger RNA (mRNA) and protein expression; (2) the application of biaxial mechanical strain to cultured vascular wall cells regulates the expression of syndecan-4 mRNA and protein and its cell surface distribution and surface shedding; and (3) shed syndecan-4 directly effects cell motility behavior. We observed that syndecan-4 mRNA and protein expression were regulated in a temporally and spatially specific manner, such that initial expression of syndecan-4 was localized to adventitial cells followed by later expression in the neointima. Notably, in vitro stimulation of isolated adventitial fibroblasts with a mechanical stretch protocol that was designed to mimic in vivo balloon injury produced a rapid increase in syndecan-4 (4.3-fold increase; P < .001) that was accompanied both by enhanced protein shedding and by the disassembly of focal adhesions. Also significant was that shed syndecan-4, induced with mechanically conditioned media, appeared to be responsible for a chemotactic response of adventitial fibroblasts (P = .005). These results indicate that mechanical strain tightly regulates syndecan-4 expression, which may, in part, provide a mechanism for the activation of myofibroblast migration from the tunica adventitia into the neointima.
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