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• W2075194275 abstract "Fimbrin, an actin-bundling protein, is a component of the osteoclast adhesion complexes called podosomes. In this study, we (1) determined the localization of fimbrin in the mature rabbit osteoclast as well as in differentiating osteoclasts using the avian monocyte-derived osteoclast differentiation model, (2) characterized the distribution and accumulation of three fimbrin isotypes (T, L, and I) in avian monocytes as they fused to form multinucleate osteoclast-like cells, and (3) report for the first time, a close spatial relationship between podosomes and microtubules using fimbrin as a marker of the podosome. Immunofluorescence using anti-T-fimbrin, anti-L-fimbrin, and pan-isotype-anti-fimbrin antibodies, showed that fimbrin is an integral component of the podosome core in the mature rabbit osteoclast and in the monocyte-derived osteoclast throughout differentiation. Anti-I-fimbrin, however, did not show immunoreactivity in these cultures. These studies also show that in the avian model of monocyte-derived osteoclast differentiation, day 2 cells (D2) are predominantly mononucleate and have few podosomes. By days 4 and 6 in culture (D4 and D6), many cells have fused and punctate rows of podosomes are commonly observed at cell margins. Analysis by Western blot of protein accumulation showed that after an initial small rise from D2 to D4, L-fimbrin levels remained relatively constant from D4 to D6. However, T-fimbrin protein levels increase steadily from D2 to D6, suggesting that it may be related to the increase in podosome formation as monocytes fuse to form osteoclasts. Finally, we examined the distribution of podosomes relative to other cytoskeletal elements such as microtubules and intermediate filaments. Double immunofluorescence labeling using anti-fimbrin and anti-tubulin showed podosomes lying adjacent to microtubules at cell margins. When osteoclasts were treated with nocodazole (1 X 10(-6) M) to disrupt microtubules, the distribution of podosomes became more random and was no longer confined to the cell periphery. These results suggest that microtubule-podosome interactions may play a role in osteoclast adhesion." @default.
• W2075194275 created "2016-06-24" @default.
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• W2075194275 date "1997-01-01" @default.
• W2075194275 modified "2023-10-16" @default.
• W2075194275 title "Fimbrin in podosomes of monocyte-derived osteoclasts" @default.
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• W2075194275 doi "https://doi.org/10.1002/(sici)1097-0169(1997)37:4<308::aid-cm3>3.0.co;2-0" @default.
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