Cytoskeleton은 세포핵과 세포외 기질을 연결하고 있어서 기질에 가해지는 물리적 힘에 의해 cytpskeletal change가 유도되고 이에 의해 세포의 개조활성이 영향을 받는다고 생각되어 왔다. 본 연구는 골모세포 활성에 대한 cytoskeletal change의 역할을 규명하기 위한 것으로서, 신생 백서로부터 조골세포양 세포을 분리, 배양하고 네가지 농도의 cytochalasin B(CB) 또는 colchicine(COL)을 3시간 처리하였다. 다시 배양액을 교환하고 24시간 동안 배양하여 prostaglandin E<sub>2</sub> (PGE<sub>2</sub>), interleukin-6(IL-6), tumor necrosis factors (TNF-a) 및 matrix metalloproteinase-1(MMP-1) 생산을 측정하고 통계적으로 비교하였으며 cytoskeletal protein actin 변화를 관찰하기위하여 면역형광염색하고 형광현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1. CB처리군에서 PGE<sub>2</sub> 생산이 증가되는 경향을 보였고 COL 처리군에서는 약물농도에 비례하여 중가하였다. 2. IL-6 생산은 CB농도 1.0µg/ml일때를 제외하고 증가되었다. 3. TNF-a도 CB 1.0µg/ml 일때를 제외하고 증가하였다. 4. MMP-1생산은 CB 처리군에서 감소하는 경향을 보이고 COL 처리군에서는 변화되지 않았다. 5. CB처리군에서는 cytoskeletal actin stress fibers가 사라지고 세포모양이 둥글어지는 경향을 보였다. 이상의 결과로 미루어 보아 cytoskeletal rearrangement는 골모세포유사세포의 활성, 특히 PGE<sub>2</sub>, IL-6, 및 TNF-a같은 paracrine/autocrine factor의 생산과 관련있는 것으로 보인다.
The cytoskeleton has been shown to form a network, connecting the extracelluar matrix via integrin with the nucleus and the cytoplasmic constituents of the cell It is therefore assumed that the cytoskeleton may mediate signals generated by perturbations originating in the matrix. The purpose of this study is to examine the effect of cytoskeletal change on osteoblastic cell activities. The author cultured osteohinstic cells obtained from neonatal mouse calvaria The cells were treated with cytochalasin B(CB) or colchicine (COL) at four concentrations for 3 hours and after another 24 hours the conditioned media was collected and assayed for prostaglandin E<sub>2</sub> (PGE<sub>2</sub>), interleukin-6(IL-6), tumor necrosis factors (TNF-a) and matrix metalloproteinase-1(MMP-1). In addition, the cytoskeletal protein actin were observed by immunofluorescence. The results were as follows: 1. The production of PGE<sub>2</sub> showed the tendency to be increased in CB-treated group. PGE<sub>2</sub> was increased in COL-treated group dose-dependantly. 2. IL-6 Production, in CB-treated group, was increased, except at 1.0 µg/ml. IL-6 was induced in COL-treated group. 3. TNF-a production was increased in CB-treated group, except at 1.0 hg/ml, and in COL-treated group, that was increased. 4. The MMP-F production was decreased in CB-treated goup and was not changed in COL-treated group, which could be selectively visnai zed by immunoblotting with monospecific antibody. 5. The cytoskeletal actin stress fibers were disappeared and the cells showed to be rounded in CB-treated group. These results indicated that there are a relationship between the cytoskeletal rearrangements and osteoblastic cell activities, especially in release of paracrine/autocrine factors, such as PGE<sub>2</sub>, IL-6, and TNF-a.