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In order to enhance the healing potential of an injured tendon, we have prepared a novel biomimetic aligned collagen-nanoparticle (NP) composite fiber using an electrochemical process. The aligned collagen-NP composite fiber is designed to affect the cellular activity of adipose-derived stem cells (ADSCs) through two different ways: (i) topographic cues(More)
We investigated whether polycystin-1 is a bone mechanosensor. We conditionally deleted Pkd1 in mature osteoblasts/osteocytes by crossing Dmp1-Cre with Pkd1(flox/m1Bei) mice, in which the m1Bei allele is nonfunctional. We assessed in wild-type and Pkd1-deficient mice the response to mechanical loading in vivo by ulna loading and ex vivo by measuring the(More)
The mechanisms whereby bone mineralizes are unclear. To study this process, we used a cell line, MLO-A5, which has highly elevated expression of markers of the late osteoblast such as alkaline phosphatase, bone sialoprotein, parathyroid hormone type 1 receptor, and osteocalcin and will mineralize in sheets, not nodules. In culture, markers of osteocytes and(More)
Current theories suggest that bone modeling and remodeling are controlled at the cellular level through signals mediated by osteocytes. However, the specific signals to which bone cells respond are still unknown. Two primary theories are: (1) osteocytes are stimulated via the mechanical deformation of the perilacunar bone matrix and (2) osteocytes are(More)
A parametric finite element model of an osteocyte lacuna was developed to predict the microstructural response of the lacuna to imposed macroscopic strains. The model is composed of an osteocyte lacuna, a region of perilacunar tissue, canaliculi, and the surrounding bone tissue. A total of 45 different simulations were modeled with varying canalicular(More)
Genetic effects on mechanical properties have been demonstrated in rodents, but not confirmed in primates. Our aim was to quantify the proportion of variation in vertebral trabecular bone mechanical properties that is due to the effects of genes. L3 vertebrae were collected from 110 females and 46 male baboons (6-32 years old) from a single extended(More)
This paper has not been screened for accuracy nor refereed by any body of scientific peers and should not be referenced in the open literature. ABSTRACT The objective of this investigation is to develop a high fidelity, parametric finite element model of the cervical spine motion segment using a hierarchical model verification and validation approach. A(More)
Osteocytes are considered as the major mechanosensory cells of the bone tissue that control the bone remodeling process. Since osteocytes are buried inside mineralized matrix, they maintain a strong communication network with other cells. Long dendritic processes of the osteocytes act as communication cables, conveying mechanical signals to the neighboring(More)
Since clinical measures of bone mineral density do not necessarily predict whether a person will fracture a bone without an intervention, there is a need to find supplementary tools for assessing bone quality. Presently, we hypothesized that measures of mobile and bound water by a Nuclear Magnetic Resonance (NMR) technique are correlated with bone strength(More)
We report the results of a series of experiments designed to determine the effects of ibandronate (Ibn) and risedronate (Ris) on a number of bone quality parameters in aged osteopenic rats to explain how bone material and bone mass may be affected by the dose of bisphosphonates (BP) and contribute to their anti-fracture efficacy. Eighteen-month old female(More)