この研究は、低周波磁界(15 Hz, 1mT)が骨髄間葉幹細胞(MSCs)の骨芽細胞および脂肪細胞への分化を直接的に制御するか否かをラットのMSCsを用いて調べた。磁界ばく露の結果として、幹細胞の骨芽細胞への分化が促進され、同時に脂肪細胞形成が阻害された;アルカリホスファターゼ(ALP)活性と石灰化小節形成が増加し、RUNX2、ALP、BMP2、DLX5、BSPなど骨芽細胞固有mRNAの発現が刺激された;反対に、脂質生成が減少し、アジプシン、AP-2、PPARγ2など脂肪細胞固有mRNAの発現が阻害され、またPPARγ2のタンパク質発現も阻害された、などの所見を報告している。
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To study the role of sinusoidal electromagnetic fields of 15 Hz (1 mT) on rat mesenchymal stem cell differentiation (adipogenesis and osteogenesis) and thus, to evaluate the possible mechanism of electromagnetic fields in prevention or treatment of osteoporosis.
The bone marrow contains mesenchymal stem cells that exhibit the ability to differentiate into adipocytes and osteoblasts. A reciprocal relationship exists between bone marrow mesenchymal stem cells adipogenesis and osteogenesis. The balance between this osteoblast and adipocyte differentiation is disrupted in various human diseases.
ばく露 | パラメータ |
---|---|
ばく露1:
15 Hz
ばく露時間:
continuous for 8 h/day on 3 days
Alkaline Phosphatase Activity
|
|
ばく露2:
15 Hz
ばく露時間:
continuous for 15 days or 21 days
Mineralized Bone Matrix Formation
|
|
ばく露3:
15 Hz
ばく露時間:
continuous for 21 days
Assessment of Cytoplasmic Lipid Droplet Formation
|
|
ばく露4:
15 Hz
ばく露時間:
continuous for 14 days
Immunoblot Analysis
|
|
周波数 | 15 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 8 h/day on 3 days |
Additional information | Alkaline Phosphatase Activity |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 15 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 21 days |
Additional information | Assessment of Cytoplasmic Lipid Droplet Formation |
ばく露の発生源/構造 |
|
---|---|
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
周波数 | 15 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 14 days |
Additional information | Immunoblot Analysis |
ばく露の発生源/構造 |
|
---|---|
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
磁束密度 | 1 mT | - | - | - | - |
The data showed that the electromagnetic field promoted osteogenic cell differentiation of the stem cells and concurrently inhibited adipocyte formation. The electromagnetic field increased alkaline phosphatase enzyme activity and mineralized nodule formation, and stimulated osteoblast-specific gene expression of RUNX2, ALP, BMP2, DLX5, and BSP. In contrast, the electromagnetic field exposure decreased adipogenesis and inhibited adipocyte-specific gene expression of adipsin, AP2, and PPARγ2, and also inhibited protein expression of PPARγ2.
These findings suggest that commitment of mesenchymal stem cells into osteogenic or adipogenic lineages is influenced by the electromagnetic field.
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