2017 Fiscal Year Final Research Report
The role of PPP1r18, an actin binding protein, in osteoclastic bone resorption
| Project/Area Number |
16K20423
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Functional basic dentistry
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| Research Institution | Kyushu Dental College |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
JIMI Eijiro 九州歯科大学, 分子情報生化学分野, 教授 (40276598)
KOKABU Shoichiro 九州歯科大学, 分子情報生化学分野, 准教授 (30448899)
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| Research Collaborator |
NAKATOMI Chihiro
URATA MARIKO
TOYAMA Kenya
KOBAYAKAWA Miki
YAGINUMA Tatsuki
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 破骨細胞 / 骨吸収 |
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| Outline of Final Research Achievements |
Osteoclasts in tyrosine kinase Src deficient mice that show osteopetrosis hardly resorb bone matrix because of disable to attachment to bone matrix. Src organizes actin accumulation and regulates actin ring formation for attachment. However molecular mechanisms how Src regulates actin ring formation in osteoclasts are not fully understood. We identified an actin binding protein PPP1r18 as Src binding protein by mass spectrum analysis. PPP1r18 was expressed and localized in actin ring with Src of osteoclasts. These results suggest that PPP1r18 bind to Src and involved in actin ring formation. Downregulation of PPP1r18 expression promoted actin ring formation. On the other hand, overexpression of PPP1r18 inhibited actin ring formation and bone resorption. Mutation of protein phosphatase 1 binding domain of PPP1r18 canceled inhibition of actin ring formation by PPP1r18. These results suggest that PPP1r18 negatively regulates actin ring formation and bone resorption.
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| Free Research Field |
機能系基礎歯科学
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