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- W2040807075 abstract "Cancer of the prostate commonly metastasizes to bony sites where cells acquire an aggressive, rapidly proliferating, androgen-independent phenotype. The interaction between bone and prostate, thus, becomes a key factor in disease progression. Fluctuations in intracellular ionized Ca2+ [Ca2+]i are rapid, regulated signal transduction events often associated with cell proliferation. Hence, Ca2+ signals provide a convenient measure of early events in cancer cell growth. This study developed single cell fluorescent imaging techniques to visualize Ca2+ signals in Fura-2 loaded prostatic cancer cell lines of various metastatic phenotypes. Solubilized bone fractions containing extracellular matrix and associated proteins were tested for the ability to trigger Ca2+ signals in prostate cancer cell lines. Fractions representing the complete repertoire of non-collagenous proteins present in mineralized bone were tested. Results demonstrated that two bone fractions termed D3b- and D4a-triggered Ca2+ signals in prostate cancer cells derived from bone (PC-3), but not brain (DU-145) metastases of prostate cancer. Lymph-node derived LNCaP cells also did not produce a Ca2+ signal in response to addition of soluble bone matrix. No other bone fractions produced a Ca2+ signal in PC-3 cells. It is of interest that bone fractions D3b and D4a contain a number of non-collagenous matrix proteins including osteonectin (SPARC) and osteopontin (OPN), as well as prothrombin. Moreover, antibody LM609 that recognizes the alpha v beta 3 integrin, blocks the ability of OPN to trigger a Ca2+ transient in PC-3 cells. These studies support a conclusion that bone-matrix proteins play a role in the growth and progression of metastatic prostate cancer, and that prior growth in bone may be associated with development of a bone-matrix-responsive phenotype." @default.
- W2040807075 created "2016-06-24" @default.
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- W2040807075 date "2000-01-01" @default.
- W2040807075 modified "2023-09-23" @default.
- W2040807075 title "Calcium signals in prostate cancer cells: specific activation by bone-matrix proteins" @default.
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- W2040807075 doi "https://doi.org/10.1054/ceca.1999.0083" @default.
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