The Effect of Cholesterol on the Osteoblast Responsiveness to Hydrodynamic Pressure Stimulation
Year: 2015
Type: article
Abstract: Hypercholesterolemia is a risk factor for osteoporosis but the underlying mechanism is unknown. Previous evidence suggests that osteoporosis results from an impaired regulation of osteoblasts by fluid pressure fluctuations in the bone matrix. Recently, our laboratory showed that enhanced cholesterol in the cell membrane, due to hypercholesterolemia, alters leukocyte mechanosensitivity. We predict a similar link between osteoblasts and hypercholesterolemia leading to osteoporosis. Specifically, we hypothesize that extracellular cholesterol modifies the osteoblast sensitivity to pressure. MC3T3-E1 cells were exposed to hydrodynamic pressures regimes (mean=40mmHg, amplitude=0-20mmHg, frequency=1Hz) for 1-12 hours. To assess the impact of membrane cholesterol enrichment, cells were pre-treated with 0-50 µg/mL cyclodextran:cholesterol conjugates. We assessed the pressure effects on mitosis and F-actin stress fiber formation (SFF) of cells. Exposure of cells to 50/30 mmHg pressure transiently increased the number of cells in the S- and G2M-phases of mitosis after 6 and 12 hours, respectively. Relative to controls, osteoblast-like cells exposed to all pressures exhibited significantly (p
Author: Kristen Lough
Institution: University of Kentucky
Language: English
Subfield: Cell Biology
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W146648942