Sustained orbital shear stress stimulates smooth muscle cell proliferation via the extracellular signal-regulated protein kinase 1/2 pathway Hidenori.

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Sustained orbital shear stress stimulates smooth muscle cell proliferation via the extracellular signal-regulated protein kinase 1/2 pathway Hidenori Asada, MD, Jacek Paszkowiak, MD, Desarom Teso, MD, Kashif Alvi, MD, Arnar Thorisson, MD, Jared C. Frattini, MD, Fabio A. Kudo, MD, PhD, Bauer E. Sumpio, MD, PhD, Alan Dardik, MD, PhD Journal of Vascular Surgery Volume 42, Issue 4, Pages 772-780 (October 2005) DOI: 10.1016/j.jvs.2005.05.046 Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 1 Proliferation and morphology of smooth muscle cells (SMCs) under orbital shear stress. A, Line graph shows the time course of SMC numbers for ≤10 days. SMCs exposed to orbital shear stress (○) demonstrated significantly increased cell numbers compared with static (•) conditions (n = 5; P < .0001, analysis of variance [ANOVA]; *days 7 and 10, P = .01 and P = .002, respectively, post hoc). B, Bar graph reflects the cell density of cells seeded uniformly in the whole culture well or exclusively in the center or periphery of the culture well. SMCs exposed to orbital shear stress in the whole well or exclusively in the periphery of the well exhibited significantly increased cell density compared with static conditions (n = 4; *P = .006 and P = .03, respectively, ANOVA). C, Bar graph reflects the percentage of cells staining positively for proliferating cell nuclear antigen. SMC exposed to orbital shear stress in the periphery of the well demonstrated significantly increased PCNA expression compared with static conditions (n = 3, P = .006, ANOVA; *periphery, P = .002, post-hoc). D, Morphology of SMCs after 10 days of culture (×300). The edge of the culture well is to the right in all panels. The top panels are under static conditions; the bottom panels are under shear-stress conditions. The left panels are stained with hematoxylin and eosin (H&E); the right panels are stained for proliferating cell nuclear antigen (PCNA). SMCs exposed to orbital shear stress in the periphery of the well were slightly elongated and aligned perpendicularly to the direction of flow. Journal of Vascular Surgery 2005 42, 772-780DOI: (10.1016/j.jvs.2005.05.046) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 2 Phenotypic modulation of smooth muscle cells (SMCs) under orbital shear stress. A, α-Actin, a marker of the SMC contractile phenotype, had significantly decreased expression in SMCs exposed to orbital shear stress (n = 3; P = .04, analysis of variance [ANOVA]; *P = .04, post hoc), with greater decrease in the periphery of the well (†P = .009, post hoc). B, Calponin, a marker of the SMC contractile phenotype, had significantly decreased expression in SMCs exposed to orbital shear stress (n = 3; P = .03, ANOVA; *P = .03, post hoc), with a greater decrease in the periphery of the well (†P = .01, post hoc). C, Vimentin, a marker of the SMC synthetic phenotype, had significantly increased expression in SMCs exposed to orbital shear stress (n = 3; P = .05, ANOVA; *P = .04, post hoc), with increases in both the center and periphery of the well (†P = .01 and *P = .05, post hoc). D, β-Actin, a marker of the SMC synthetic phenotype, had increased expression in SMCs exposed to orbital shear stress (n = 4; P = .09, ANOVA), with significant increases in both the center and periphery of the well (†P = .02 and *P = .04, post hoc). GAPDH, Glyceraldehyde-3-phosphate dehydrogenase. Journal of Vascular Surgery 2005 42, 772-780DOI: (10.1016/j.jvs.2005.05.046) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 3 Extracellular signal-regulated protein kinase 1/2 (ERK1/2) phosphorylation with orbital shear stress. A, Time course of ERK1/2 phosphorylation by orbital shear stress in smooth muscle cells. Bar graph demonstrates maximal ERK1/2 phosphorylation (147%) at 15 minutes (n = 4; P < .0001, analysis of variance [ANOVA]; *P < .0001, post hoc). B, Inhibition of ERK1/2 phosphorylation with PD98059 (10 μM) (n = 4; P = .002, ANOVA). The 110% increase in ERK1/2 phosphorylation is significant (*P = .005, post hoc), as is the inhibition with PD98059 (†P = .002, post hoc). C, Inhibition of ERK1/2 phosphorylation with PD98059 in smooth muscle cells differentially cultured in the center or periphery of the culture well (n = 3). The 116% increase in ERK1/2 phosphorylation in the periphery is significant (*P = .0003, post hoc), as is the inhibition with PD98059 (†P = .002, post hoc). Journal of Vascular Surgery 2005 42, 772-780DOI: (10.1016/j.jvs.2005.05.046) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 4 Dependence of smooth muscle cell (SMC) proliferation on extracellular signal-regulated protein kinase 1/2 (ERK1/2) phosphorylation. A, Bar graph demonstrates SMC density at 0 and 10 days of SMCs cultured in the whole well or differentially cultured in the center or periphery of the well (n = 4). SMCs were cultured in the presence of 10% fetal bovine serum (FBS) and with PD98059 (10 μM) or vehicle alone. For SMCs seeded in the whole culture well, the increase in proliferation due to orbital shear stress is significant (*P < .0001, post hoc), as is the inhibition with PD98059 (†P <.0001, post hoc). For SMCs seeded only in the periphery, the increase in proliferation due to orbital shear stress is significant (**P = .0002, post hoc), as is the inhibition with PD98059 (††P = .001, post hoc). B, Bar graph demonstrates SMC numbers at 0 and 10 days of SMCs cultured in the whole well, in the presence of 10% FBS and with either PD98059 (10 μM), SB203580 (10 μM), or vehicle alone (n = 4). The increase in SMC proliferation due to orbital shear stress is significant (*P = .0008, post hoc); the reduced proliferation in the presence of the ERK1/2 pathway-inhibitor PD98059 is significant (†P < .0001, post hoc); the effect of the p38 pathway-inhibitor SB203580 was not significant (P = .20, post hoc). Journal of Vascular Surgery 2005 42, 772-780DOI: (10.1016/j.jvs.2005.05.046) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 5 Inhibition of orbital shear-stress-induced smooth muscle cell (SMC) phenotype modulation with PD98059 (10 μM). A, α-Actin, a marker of the SMC contractile phenotype, had 71% decreased expression in SMCs exposed to orbital shear stress (n = 4; *P = .0005, post hoc) but was only decreased 41% in the additional presence of PD98059 (†P = .02, difference between orbital shear stress and PD98059, post hoc). B, α-Actin expression was reduced 72% in SMCs in the periphery (n = 3; *P = .009, post hoc), but was only decreased 31% in the additional presence of PD98059 (P = .16, difference between control and PD98059, post hoc). C, Vimentin, a marker of the SMC synthetic phenotype, had 72% increased expression in SMCs exposed to orbital shear stress (n = 3; *P < .0001, post hoc) but was decreased 1% in the additional presence of PD98059 (†P < .0001, difference between orbital shear stress and PD98059, post hoc). D, Vimentin expression was increased 125% in SMCs in the periphery (n = 4; *P = .002, post hoc) but was only increased 29% in the additional presence of PD98059 (P = .44, difference between control and PD98059, post hoc). GAPDH, Glyceraldehyde-3-phosphate dehydrogenase. Journal of Vascular Surgery 2005 42, 772-780DOI: (10.1016/j.jvs.2005.05.046) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions