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Delayed bone healing can be a considerable problem in both children and adults. Up to 10% of fractures fail to heal properly. An advanced understanding of the cellular responses in bone repair and their manipulation could improve the lives of many patients with orthopaedic problems. These studies will advance out knowledge of interventions to promote bone healing which could be translated rapidly into clinical care.
The Role Of Sorting Nexin 27 In Cargo-trafficking During Skeletal Homeostasis
Funder
National Health and Medical Research Council
Funding Amount
$623,327.00
Summary
Skeletal diseases encompass a devastating set of disorders ranging from heritable skeletal dysplasia’s such as dwarfism through to degenerate diseases like osteoporosis. This research project aims to determine the role of a protein called Sorting Nexin 27 (SNX27), normally involved in the transport of intracellular cargo (e.g. growth factor receptors), in the maintenance of the skeleton and its potential contribution to the pathogenesis of skeletal disorders.
Influence Of Osteocytes On Anabolic Bone Therapies
Funder
National Health and Medical Research Council
Funding Amount
$586,965.00
Summary
This project seeks to define the influence of changes in gene expression in cells called osteocytes, that exist within the substance of bone. These cells form a communication network within the bones of the skeleton, and appear to influence bone formation; changes in gene expression by these cells could influence the efficacy of current and emerging osteoporosis therapies.
The Role Of 'Orphan' Transporters In Bone Homeostasis And Disease
Funder
National Health and Medical Research Council
Funding Amount
$675,668.00
Summary
Osteoclasts (OCs) are giant multinucleated cells exclusively responsible for physiological bone degradation (resorption). Excessive OC activity leads to localised bone destruction (osteolysis) as observed in patients with osteoarthritis and underlies decreased bone mass and fragility fractures that are a hallmark of osteoporosis. This project examines the role of an orphan solute carrier transporter in OC function and its potential involvement in bone disease.
Structural And Functional Analyses Of Rat Receptor Activator Of NF-kb Ligand
Funder
National Health and Medical Research Council
Funding Amount
$226,320.00
Summary
Rat RANKL (Xu and Zheng, rat RANKL, AustraliaProvisional Patent PQ3147) has a variety of biological activities including osteoclast differentiation and polarization, and dendritic cell function. Overproduction or increased activity of RANKL can result in excessive osteoclast formation, activation, and bone resorption. This process contributes to many common bone lytic disorders such as osteoporosis, Paget's disease, bone metastatic diseases, arthritis, aseptic bone loosening and non-union of fra ....Rat RANKL (Xu and Zheng, rat RANKL, AustraliaProvisional Patent PQ3147) has a variety of biological activities including osteoclast differentiation and polarization, and dendritic cell function. Overproduction or increased activity of RANKL can result in excessive osteoclast formation, activation, and bone resorption. This process contributes to many common bone lytic disorders such as osteoporosis, Paget's disease, bone metastatic diseases, arthritis, aseptic bone loosening and non-union of fractures. This proposal addresses the important and fundamental issue of RANKL regarding the role of molecular structure on its biological function. We have established that the TNF-like core domain is the functional domain, important for osteoclastogenesis, osteoclast polarisation and protecting against Fas-triggered apoptosis. This proposal will further characterise the mutant forms of the TNF-like core domain of RANKL using site directed mutagenesis and protein truncation analysis, and assess their respective binding activities to OPG and RANK, and their biological activities both in vitro and in vivo. It will lead us into better understanding of the structure-function relationship of RANKL. Ideally, we would like to develop a relative agent for the suppression of osteolysis in orthopaedic related diseases including osteoporosis. Such an optimized molecule could become a potent therapeutic agent that selectively inhibits osteoclast formation and bone resorption.Read moreRead less
Molecular Characterization Of V-ATPase V0 Domain Subunits E1 And E2 In Osteoclast
Funder
National Health and Medical Research Council
Funding Amount
$558,909.00
Summary
Osteoporotic fractures in the elderly are often linked to increased mortality rates. Excess bone resorption is a major contributor to the onset of the disease. The proposed project focuses on the investigation of the molecular mechanisms of acid secretion that is required for the bone degradation in body. The project will examine the role of the proton pump in bone resorption and seek potential targets for the treatment of osteoporosis.
gp130 is a protein expressed in all cells in the body; this project will analyse the influence of gp130 within the cells that form bone, the cells that destroy bone, and the cells that form a communication network within the bone matrix. Understanding the way this protein works will help us to understand how current therapies for osteoporosis work, and will help us to design new therapies.
Osteocytes (OY) are the most abundant cell type in bone whose high density and viability are essential for healthy bone. We have found that vitamin K, vitamin D and strontium, promote human OY differentiation. We will test these in novel models of human OY differentiation and survival, and in animal models of bone loss associated with vitamin D deficiency, menopause and glucocorticoid treatment. Our work will lead to a better understanding of human OY and give a new approach to treat osteoporosi ....Osteocytes (OY) are the most abundant cell type in bone whose high density and viability are essential for healthy bone. We have found that vitamin K, vitamin D and strontium, promote human OY differentiation. We will test these in novel models of human OY differentiation and survival, and in animal models of bone loss associated with vitamin D deficiency, menopause and glucocorticoid treatment. Our work will lead to a better understanding of human OY and give a new approach to treat osteoporosis.Read moreRead less
Furin: Carving-up Vital Substrates For Bone Remodelling And Homeostasis
Funder
National Health and Medical Research Council
Funding Amount
$815,972.00
Summary
Osteoporosis, or porous bone, is a disease characterized by low bone mass and structural deterioration of bone tissue, leading to bone fragility and an increased susceptibility to fractures. It is caused by an imbalance between the cells that are constantly reabsorbing and reforming bone. The proposed project will address furin as a novel regulator of bone remodelling.