Combined effects of substrate topography and stiffness on endothelial cytokine and chemokine secretion

Hyeona Jeon, Jonathan H. Tsui, Sue Im Jang, Justin H. Lee, Soojin Park, Kevin Mun, Yong Chool Boo, Deok Ho Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Endothelial physiology is regulated not only by humoral factors, but also by mechanical factors such as fluid shear stress and the underlying cellular matrix microenvironment. The purpose of the present study was to examine the effects of matrix topographical cues on the endothelial secretion of cytokines/chemokines in vitro. Human endothelial cells were cultured on nanopatterned polymeric substrates with different ratios of ridge to groove widths (1:1, 1:2, and 1:5) and with different stiffnesses (6.7 MPa and 2.5 GPa) in the presence and absence of 1.0 ng/mL TNF-α. The levels of cytokines/chemokines secreted into the conditioned media were analyzed with a multiplexed bead-based sandwich immunoassay. Of the nanopatterns tested, the 1:1 and 1:2 type patterns were found to induce the greatest degree of endothelial cell elongation and directional alignment. The 1:2 type nanopatterns lowered the secretion of inflammatory cytokines such as IL-1β, IL-3, and MCP-1, compared to unpatterned substrates. Additionally, of the two polymers tested, it was found that the stiffer substrate resulted in significant decreases in the secretion of IL-3 and MCP-1. These results suggest that substrates with specific extracellular nanotopographical cues or stiffnesses may provide anti-atherogenic effects like those seen with laminar shear stresses by suppressing the endothelial secretion of cytokines and chemokines involved in vascular inflammation and remodeling.

Original languageEnglish (US)
Pages (from-to)4525-4532
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number8
DOIs
StatePublished - Mar 4 2015
Externally publishedYes

Keywords

  • chemokines
  • cytokines
  • endothelial cells
  • nanotopography
  • substrate stiffness

ASJC Scopus subject areas

  • Materials Science(all)

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