| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Research Abstract |
Osteoclasts have two conflicting tendencies : lower capacity to survive and higher capacity to execute energy-consuming activities like bone resorption. Here, we report that mature mitochondria-rich osteoclasts have lower intracellular ATP compared to their precursors. Severe ATP depletion caused by disrupting the gene of mitochondrial transcription factor A(Tfam) leads to increased bone-resorbing activity despite accelerated apoptosis. The release of ATP from intracellular stores negatively regulates bone-resorbing activity through an autocrine/paracrine feedback loop by altering cytoskeletal structures. Thus, our study provides evidence for a mechanism by reciprocal changes in intracellular and extracellular ATP, which regulate the negative correlation between osteoclast survival and bone resorption.
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