title: Adhesion and internalization differences of COM nanocrystals on Vero cells before and after cell damage.
abstract: The adhesion and internalization between African green monkey kidney epithelial (Vero) cells (before and after oxidative damage by hydrogen peroxide) and calcium oxalate monohydrate (COM) nanocrystals (97±35nm) were investigated so as to discuss the molecular and cellular mechanism of kidney stone formation. Scanning electron microscope (SEM) was used to observe the Vero-COM nanocrystal adhesion; the nanocrystal-cell adhesion was evaluated by measuring the content of malonaldehyde (MDA), the activity of superoxide dismutase (SOD), the expression level of cell surface osteopontin (OPN) and the change of Zeta potential. Confocal microscopy and flow cytometry were used for the observation and quantitative analysis of crystal internalization. In the process of adhesion, the cell viability and the SOD activity declined, the MDA content, Zeta potential, and the OPN expression level increased. The adhesive capacity of injured Vero was obviously stronger than normal cells; in addition the injured cells promoted the aggregation of COM nanocrystals. The capacity of normal cells to internalize crystals was obviously stronger than that of injured cells. Cell injury increased adhesive sites on cell surface, thereby facilitating the aggregation of COM nanocrystals and their attachment, which results in enhanced risk of calcium oxalate stone formation.
authors.affiliation: Department of chemistry, Jinan University, Guangzhou 510632, China;; Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China.
authors.forename: Qiong-Zhi
authors.initials: QZ
authors.lastname: Gan
authors.affiliation: Department of chemistry, Jinan University, Guangzhou 510632, China;; Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China.
authors.forename: Xin-Yuan
authors.initials: XY
authors.lastname: Sun
authors.affiliation: Department of chemistry, Jinan University, Guangzhou 510632, China;; Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China. Electronic address: toyjm@jnu.edu.cn.
authors.forename: Jian-Ming
authors.initials: JM
authors.lastname: Ouyang
mesh_terms: D000818:Animals; D002129:Calcium Oxalate / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D002522:Chlorocebus aethiops; D053758:Nanoparticles / Q000737:chemistry*; D014709:Vero Cells
chemical_list: D002129:Calcium Oxalate
keywords: Calcium oxalate monohydrate; Crystal adhesion; Crystal internalization; Oxidative damage