title: Artery Remodeling Under Axial Twist in Three Days Organ Culture.
abstract: Arteries often endure axial twist due to body movement and surgical procedures, but how arteries remodel under axial twist remains unclear. The objective of this study was to investigate early stage arterial wall remodeling under axial twist. Porcine carotid arteries were twisted axially and maintained for three days in ex vivo organ culture systems while the pressure and flow remained the same as untwisted controls. Cell proliferation, internal elastic lamina (IEL) fenestrae shape and size, endothelial cell (EC) morphology and orientation, as well as the expression of matrix metalloproteinases (MMPs), MMP-2 and MMP-9, and tissue inhibitor of metalloproteinase-2 (TIMP-2) were quantified using immunohistochemistry staining and immunoblotting. Our results demonstrated that cell proliferation in both the intima and media were significantly higher in the twisted arteries compared to the controls. The cell proliferation in the intima increased from 1.33 ± 0.21% to 7.63 ± 1.89%, and in the media from 1.93 ± 0.84% to 8.27 ± 2.92% (p < 0.05). IEL fenestrae total area decreased from 26.07 ± 2.13% to 14.74 ± 0.61% and average size decreased from 169.03 ± 18.85 μm(2) to 80.14 ± 1.96 μm(2) (p < 0.01), but aspect ratio increased in the twist group from 2.39 ± 0.15 to 2.83 ± 0.29 (p < 0.05). MMP-2 expression significantly increased (p < 0.05) while MMP-9 and TIMP-2 showed no significant difference in the twist group. The ECs in the twisted arteries were significantly elongated compared to the controls after three days. The angle between the major axis of the ECs and blood flow direction under twist was 7.46 ± 2.44 degrees after 3 days organ culture, a decrease from the initial 15.58 ± 1.29 degrees. These results demonstrate that axial twist can stimulate artery remodeling. These findings complement our understanding of arterial wall remodeling under mechanical stress resulting from pressure and flow variations.
authors.affiliation: Institute of Mechanobiology and Medical Engineering, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Guo-Liang
authors.initials: GL
authors.lastname: Wang
authors.forename: Yangming
authors.initials: Y
authors.lastname: Xiao
authors.forename: Andrew
authors.initials: A
authors.lastname: Voorhees
authors.forename: Ying-Xin
authors.initials: YX
authors.lastname: Qi
authors.forename: Zong-Lai
authors.initials: ZL
authors.lastname: Jiang
authors.forename: Hai-Chao
authors.initials: HC
authors.lastname: Han
mesh_terms: D000818:Animals; D002339:Carotid Arteries / Q000378:metabolism* / Q000473:pathology; D042783:Endothelial Cells / Q000378:metabolism* / Q000473:pathology; D005786:Gene Expression Regulation; D020778:Matrix Metalloproteinase 2 / Q000096:biosynthesis; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis; D009924:Organ Culture Techniques; D013552:Swine; D013997:Time Factors; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000096:biosynthesis; D066253:Vascular Remodeling
chemical_list: D019716:Tissue Inhibitor of Metalloproteinase-2; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9