國家衛生研究院 NHRI:Item 3990099045/3792

NHRI > Institute of Biomedical Engineering and Nanomedicine > Jeng-Jiann Chiu > Periodical Articles > Item 3990099045/3792

Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/3792

Title:	Shear stress induces synthetic-to-contractile phenotypic modulation in smooth muscle cells via peroxisome proliferator-activated receptor alpha/delta activations by prostacyclin released by sheared endothelial cells
Authors:	Tsai, MC;Chen, L;Zhou, J;Tang, Z;Hsu, TF;Wang, Y;Shih, YT;Peng, HH;Wang, N;Guan, Y;Chien, S;Chiu, JJ
Contributors:	Division of Medical Engineering Research
Abstract:	RATIONALE: Phenotypic modulation of smooth muscle cells (SMCs), which are located in close proximity to endothelial cells (ECs), is critical in regulating vascular function. The role of flow-induced shear stress in the modulation of SMC phenotype has not been well defined. OBJECTIVE: The objective was to elucidate the role of shear stress on ECs in modulating SMC phenotype and its underlying mechanism. METHODS AND RESULTS: Application of shear stress (12 dyn/cm2) to ECs cocultured with SMCs modulated SMC phenotype from synthetic to contractile state, with upregulation of contractile markers, downregulation of proinflammatory genes, and decreased percentage of cells in the synthetic phase. Treating SMCs with media from sheared ECs induced peroxisome proliferator-activated receptor (PPAR)-alpha, -delta, and -gamma ligand binding activities; transfecting SMCs with specific small interfering (si)RNAs of PPAR-alpha and -delta, but not -gamma, inhibited shear induction of contractile markers. ECs exposed to shear stress released prostacyclin (PGI2). Transfecting ECs with PGI2 synthase-specific siRNA inhibited shear-induced activation of PPAR-alpha/delta, upregulation of contractile markers, downregulation of proinflammatory genes, and decrease in percentage of SMCs in synthetic phase. Mice with PPAR-alpha deficiency (compared with control littermates) showed altered SMC phenotype toward a synthetic state, with increased arterial contractility in response to angiotensin II. CONCLUSIONS: These results indicate that laminar shear stress induces synthetic-to-contractile phenotypic modulation in SMCs through the activation of PPAR-alpha/delta by the EC-released PGI2. Our findings provide insights into the mechanisms underlying the EC-SMC interplays and the protective homeostatic function of laminar shear stress in modulating SMC phenotype.
Date:	2009-08-28
Relation:	Circulation Research. 2009 Aug 28;105(5):471-480.
Link to:	http://dx.doi.org/10.1161/circresaha.109.193656
JIF/Ranking 2023:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0009-7330&DestApp=IC2JCR
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000269384600009
Cited Times(Scopus):	http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=70149095915
Appears in Collections:	[Jeng-Jiann Chiu] Periodical Articles

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