Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0029463 (osteosarcoma)
 16,637 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Histophysiology, ultrastructure, chemical analyses of transplants and implants of Dunn and Ridgway mouse osteosarcomas demonstrate that tumorigenesis is a manifestation of deranged morphogenesis in developing mesenchymal cell populations. The end product of development is defective, incompletely calcified, disorganized bone without any inclusions of bone marrow tissue. When Dunn osteosarcoma is freeze-dried and then implanted, the tumor is resorbed and replaced by deposits of normal cartilage, bone, and bone marrow. Freeze-dried Ridgway osteosarcoma is replaced only by a fibrous connective tissue scar. Disaggregated Dunn tumor osteoblasts synthesize a trypsin-labile collagenase-resistant cell surface localized bone morphogen. Tumor matrix stroma, prepared by sequential chemical extraction of soluble non-collagenous proteins also contains significant quantities of the same bone morphogen. Tumor tissue pulverized to particle size as small as 44 micrometer3 transmitted bone morphogen more rapidly than intact tumor tissue. The total tumor cell and stroma mediated bone morphogen produces three times more normal bone than normal cortical bone matrix. Our working hypothesis is that a normal bone morphogenetic polypeptide (BMP) is synthesized by Dunn osteosarcoma cells and retained by the tumor matrix stroma. Neither the mechanism of transmission nor the mesenchymal cell receptor sites of BMP are known.
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PMID:An osteosarcoma cell and matrix retained morphogen for normal bone formation. 27 29

Bone is a tissue that responds to mechanical load by changing its internal architecture. However, the mode of transmission of mechanical stimuli into biological signals and the effect of load at the cellular level are still not clear. An in vitro system, a Flexercell Strain Unit, was used to apply cyclic load to osteoblast-like cells in culture. In the first series of experiments, ROS 17/2.8 rat osteosarcoma cells, cultured on Flex I, flexible bottomed culture plates, were subjected to a 0.05 Hz, 0.24 STRAIN cyclic load regime for 3 and 7 days, in vitro. One group subjected to load received verapamil, a calcium channel blocker, throughout the experimental period. A second group was exposed to load but received no verapamil. A third group had no drug or load and a fourth group had no load but received verapamil. Cultures were incubated for 24 hours prior to collection with 10 microCi of 45CaCl in the medium, then well bottoms were divided to yield outer (maximum) and inner (minimum) load zones for assay of radioactivity. The effect of verapamil during a 7-day loading period was studied by adding the drug to individual cultures at daily intervals. Results indicated that mechanical loading stimulates calcium incorporation in ROS 17/2.8 cell cultures by day 7 but not by day 3. Only early verapamil addition decreased load-induced calcium incorporation when drug was added prior to day 4. If verapamil was added after 4 days, the channel blocker did not diminish load-induced calcium incorporation.
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PMID:Verapamil decreases cyclic load-induced calcium incorporation in ROS 17/2.8 osteosarcoma cell cultures. 128 12

TREB5 (hXBP-1) protein is a transcription factor that recognizes the CRE-like element in enhancers of human T-cell leukemia virus and MHC class II gene and activates their transcription. TREB5 is a member of the CREB/ATF family, containing a basic amino acid region and leucine zipper structure (b-Zip structure). To characterize the key domain of TREB5 for transcriptional activation, mutational analysis was carried out. The C-terminal region of 148-221 amino acids was identified as an activation domain and was also active when fused to Gal4 DNA binding domain. This domain contains three unique regions rich in glutamic acid, glutamine, or serine/threonine and is active in both osteosarcoma (HOS) and T (Jurkat) cell lines. All of these three regions are essential; however, a part of the serine/threonine region was dispensable in Jurkat, but not in HOS cells. In addition to the activation domain, the N-terminal region showed activity in conjunction with the b-Zip structure, but not with the Gal4 DNA binding domain. Furthermore, this region showed activity in Jurkat cells, but not in HOS cells. These results suggest that TREB5 has two activational functions in transcription and may provide diversity in cell-type-specific transcriptional activation, possibly through dimerization with other b-Zip proteins and phosphorylation.
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PMID:Identification of transcriptional activation domain of TREB5, a CREB/ATF family protein that binds to HTLV-1 enhancer. 760 16

Freeze-dried Saos-2, human osteosarcoma cells, and extracts of Saos-2 cells contain all components necessary to induce ectopic new bone and marrow when implanted into athymic Nu/Nu nuce. On the other hand, human osteosarcoma cells of the U-2 OS strain failed to induce bone formation under the same experimental conditions. Our aim was to compare the relative expressions of known osteoinductive factors including bone morphogenetic proteins (BMPs) and transforming growth factor-beta (TGF-beta) in these two cell lines in an attempt to explain the unique bone-inducing ability of the Saos-2 cells. Saos-2 cells expressed mRNA for BMP-1, -2, -3, -4,-6, and TGF-beta 1. The non-osteoinductive U-2 OS cells expressed BMP-2, -4, -5, -6, and -7 as well as TGF-beta 1 mRNA, while levels of BMP-1 and BMP-3 mRNA were either not detectable or detectable at a very low level in U-2 OS cells. The presence of BMP-1 and -4 protein was confirmed in Saos-2 cells by immunofluorescence, and TGF beta protein was demonstrated by bioassay in both cell types. These findings suggest that Saos-2 cells are endowed qualitatively and quantitatively with sufficient amounts of many bone morphogenetic proteins-especially BMP-1, -3, and -4-to confer osteoinductivity upon these cells. However, the absence of osteoinductivity in U-2 OS cells, despite significant mRNA expression levels of several bone morphogenetic proteins, suggests that, even though expression of one or more bone morphogenetic proteins may be present, it may not necessarily be sufficient to confer osteoinductivity upon U-2 OS cells. U-2 OS cells may be non-osteoinductive because (1) they contain inhibitors to the BMPs or secrete inhibitory binding proteins, (2) they do not process BMPs correctly, or (3) the BMPs are inappropriately localized and sequestered within the U-2 OS cells. Saos 2 cells may be osteoinductive because (1) they uniquely express BMP-1, (2) they express an appropriate combination of interactive BMPs at appropriate levels, and/or (3) the Saos-2 cells elaborate as-yet-unidentified osteoinductive factor(s).
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PMID:Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells. 887 5

The oncophilic complex of technetium-99m labeled pentavalent dimercaptosuccinic acid (99mTc(V)-DMSA) has been successfully used for the detection of primary and metastatic medullary thyroid cancer and for imaging various soft tissue tumors like lung, brain and prostate cancer. In this article, the role of 99mTc(V)-DMSA in the diagnosis of the primary tumor and metastases of osteosarcoma patients as compared to the 99mTc-MDP scan and the CT scan was studied. Twenty-eight patients with bone disease were referred to the Nuclear Medicine Department of Saint Savas Oncology Hospital in Athens from the Orthopedics Department of the same Hospital. From them, 18 (Group A) had osteosarcoma, 7 (Group B) osteomyelitis and 3 (Group C) bone fractures. The final diagnosis was made after fine needle aspiration biopsy. All patients were subjected to the 99mTc(V)-DMSA scan, the standard bone scan (99mTc-MDP) and CT scan. Group A patients showed a selective uptake of 99mTc(V)-DMSA in the primary tumor region. No abnormal 99mTc(V)-DMSA uptake was observed in the patients of Groups B and C. The 99mTc(V)-DMSA scan was found to be superior to the 99mTc-MDP and the CT scans in identifying metastases of osteosarcoma. Sensitivity was 100%, 86% and 98% respectively.
Hell J Nucl Med
PMID:The role of 99mTc(V)-DMSA scan as compared to 99mTc-MDP and CT scans in imaging the primary tumor and metastases of osteosarcoma. 1933 Jan 92

Adrenal gland involvement as well as metastatic subcutaneous nodule from skeletal osteosarcoma are two extremely rare and unusual manifestations in the natural history of the disease. We herein report a 45 yr old female with both these uncommon occurrences, having large bilateral adrenal metastases and a metastatic subcutaneous nodule in fluorine-18 fluorodesoxy glucose- positron emission tomography the chest wall along with pulmonary metastasis arising from osteosarcoma of the mandible. Our (18)F-FDG-PET study provided all information needed about the disease status in a single examination. It is noteworthy that osteosarcoma of the jaws, thought to be relatively less aggressive compared to its counterpart in long bones, can occasionally give rise to widespread metastases, including atypical sites. A systematic review of the existing literature aiming to explore the patients' characteristics and clinical behavior of adrenal metastases from osteosarcoma, including the present case, was carried out. This was nearly always associated with pulmonary metastases with occasional association with brain or skeletal metastases. Peripheral long bones were the overwhelmingly common site of the primary, the present one being the first report of jaw bone being the primary site, giving rise to adrenal metastases. No age predilection was observed with male to female ratio of 3:1 in the small number of reported cases.
Hell J Nucl Med
PMID:Bilateral adrenal metastases and metastatic subcutaneous deposit in the chest wall from osteosarcoma of the mandible: utility of 18F-FDG-PET. 1933 Jan 84

Primary bone tumors are only occasionally reported in avian species. This paper presents the cases of an osteosarcoma in a 6-yr-old free-range chicken and a chondrosarcoma in a 3-yr-old barred Plymouth Rock chicken. The well-differentiated, moderately productive osteoblastic osteosarcoma arose from the synsacral vertebrae and had metastasized to the liver. The chondrosarcoma was well differentiated and firmly attached to the left side of the keel. There was no evidence of metastasis.
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PMID:Primary bone tumors in birds: a review and description of two new cases. 2285 6