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The Role Of CXCL12 (SDF-1)/CXCR4 In Pathological Angiogenesis And Osteolytic Bone Disease In Multiple Myeloma
Funder
National Health and Medical Research Council
Funding Amount
$665,896.00
Summary
Multiple myeloma (MM) is the second most common haematological (or blood) cancer in western countries and is unique amongst blood cancers in its capacity to destroy the skeleton. MM is a cancer of plasma cells, which in their normal non-cancerous form, reside in lymph nodes and produce antibodies against infectious agents. When they become cancerous, they migrate or home to congenial sites within the bone marrow (BM). This directed movement or homing occurs under the influence of a chemokine mol ....Multiple myeloma (MM) is the second most common haematological (or blood) cancer in western countries and is unique amongst blood cancers in its capacity to destroy the skeleton. MM is a cancer of plasma cells, which in their normal non-cancerous form, reside in lymph nodes and produce antibodies against infectious agents. When they become cancerous, they migrate or home to congenial sites within the bone marrow (BM). This directed movement or homing occurs under the influence of a chemokine molecule called CXCL12 which acts as a calling card for plasma cells to leave the lymph node and migrate to the BM. Once within the BM, the cells rapidly grow in response to BM-derived growth factors. This rapid growth causes a depletion in oxygen availability within the tumour and it becomes hypoxic. In response to this hypoxia, the tumour expresses a gene called hypoxia-inducible factor-1 (HIF-1) which regulates the expression of many proteins, including the chemokine CXCL12. Our studies show that the abnormal expression of CXCL12 by the plasma cells acts to promote blood vessel formation within the tumour, which in turn leads to greater tumour growth. In addition, our studies suggest that abnormal CXCL12 expression also promotes the recruitment and activation of large numbers of osteoclast (OC) precursors form the peripheral blood. OC are cells which normally remove unwanted or damaged bone. This proposal will study the interplay between HIF and CXCL12 in the establishment and development of MM and the associated bone destruction.Read moreRead less
Molecular And Cellular Mechanisms Of Skeletal Disease Mediated By Plasma Cell Dyscrasias
Funder
National Health and Medical Research Council
Funding Amount
$432,750.00
Summary
Osteolytic and osteosclerotic lesions of bone are common sequelae of primary and secondary bone cancers, including cancers of hematological origin. There is now strong evidence that tumor cells perturb the local balance between bone resorption and formation, and in cases of osteolysis, cause increased osteoclast (OC)-mediated bone resorption without a matching amount of bone formation. This proposal arises from our extensive clinical and basic science experience with multiple myeloma (MM) in add ....Osteolytic and osteosclerotic lesions of bone are common sequelae of primary and secondary bone cancers, including cancers of hematological origin. There is now strong evidence that tumor cells perturb the local balance between bone resorption and formation, and in cases of osteolysis, cause increased osteoclast (OC)-mediated bone resorption without a matching amount of bone formation. This proposal arises from our extensive clinical and basic science experience with multiple myeloma (MM) in addition to other skeletal tumors, and our strong background in both OC and osteoblast biology. MM is a hematological malignancy characterised by plasma cell dyscrasia, which typically causes progressive and severe destruction of the skeleton, with accompanying bone pain, fracture and finally, hypercalcaemia of malignancy. Two related diseases, MGUS and POEMS, have been chosen for study because of their key similarities and differences with MM, and are likely to shed new light on the activities of MM in the bone. MGUS does not cause identifiable bone defects, whereas POEMS can give rise to both osteolytic and osteosclerotic lesions. Comparison of these conditions will uniquely enable us to examine why these seemingly related neoplasms are able to mediate disparate skeletal disease states. Primarily, and since there are few curative therapies for MM at present, our proposed studies are designed to identify targets for therapy that will treat the most serious manifestation of this disease, namely its destruction of bone tissue.Read moreRead less