The dynamic properties of intermediate filaments during organelle transport
| Autor: | Kari Barlan, Dale K. Shumaker, Harald Herrmann, Vladimir I. Gelfand, Robert D. Goldman, Anna S. Serpinskaya, Ying-Hao Chou, Boris Grin, Margot Lakonishok, Lynne Chang |
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| Rok vydání: | 2009 |
| Předmět: |
Green Fluorescent Proteins
Intermediate Filaments Melanophores Vimentin Biology Microfilament Microtubules Models Biological Xenopus laevis Microtubule Live cell imaging Organelle Animals Intermediate filament Melanosome Melatonin Melanosomes Fluorescence recovery after photobleaching Biological Transport Cell Biology Cell biology Solubility alpha-MSH biology.protein Lysosomes Research Article |
| Zdroj: | Journal of cell science. 122(Pt 16) |
| ISSN: | 0021-9533 |
| Popis: | Intermediate filament (IF) dynamics during organelle transport and their role in organelle movement were studied using Xenopus laevis melanophores. In these cells, pigment granules (melanosomes) move along microtubules and microfilaments, toward and away from the cell periphery in response to α-melanocyte stimulating hormone (α-MSH) and melatonin, respectively. In this study we show that melanophores possess a complex network of vimentin IFs which interact with melanosomes. IFs form an intricate, honeycomb-like network that form cages surrounding individual and small clusters of melanosomes, both when they are aggregated and dispersed. Purified melanosome preparations contain a substantial amount of vimentin, suggesting that melanosomes bind to IFs. Analyses of individual melanosome movements in cells with disrupted IF networks show increased movement of granules in both anterograde and retrograde directions, further supporting the notion of a melanosome-IF interaction. Live imaging reveals that IFs, in turn, become highly flexible as melanosomes disperse in response to α-MSH. During the height of dispersion there is a marked increase in the rate of fluorescence recovery after photobleaching of GFP-vimentin IFs and an increase in vimentin solubility. These results reveal a dynamic interaction between membrane bound pigment granules and IFs and suggest a role for IFs as modulators of granule movement. |
| Databáze: | OpenAIRE |
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