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The cytoskeleton in fish melanophore melanosome positioning.

Artikel i vetenskaplig tidskrift
Författare Helen Nilsson Sköld
Sara Aspengren
Margareta Wallin
Publicerad i Microscopy research and technique
Volym 58
Nummer/häfte 6
Sidor 464-9
ISSN 1059-910X
Publiceringsår 2002
Publicerad vid Zoologiska institutionen
Zoologiska institutionen, zoofysiologi
Sidor 464-9
Språk en
Länkar dx.doi.org/10.1002/jemt.10164
Ämnesord Animals, Biological Transport, Cytoskeleton, physiology, Fishes, anatomy & histology, physiology, Melanophores, physiology, ultrastructure, Melanosomes, physiology, ultrastructure, Microscopy, Electron
Ämneskategorier Cell- och molekylärbiologi, Ekologi

Sammanfattning

Melanophore melanosomes organelles can be regulated to move and locate correspondingly to many other different organelle types. Comparing lessons from analysis of a specific melanosome distribution can, therefore, contribute to the understanding of distribution of other organelles, and vice versa. From such data, it is now generally accepted that microtubules provide directed long-distance movement, while cell peripheral movements include microfilaments. In fish melanophores, both actin and dynein exhibit counter-forces to the kinesin-like protein in maintaining the evenly dispersed state, while actin and kinesin exhibit counter-forces to dynein in many other systems. Lessons from elevating cAMP levels indicate the presence of a peripheral feedback regulatory system involved in maintaining the evenly dispersed state. Studies from dynein inhibition suggest that the kinesin-like protein involved in fish melanosome dispersal is regulated in contrast to many other systems. One would further expect melanosome transport to be regulated also on actin/myosin, in order to prevent actin-dependent capture of melanosomes during the microtubule-dependent aggregation and dispersion. General findings will be discussed in comparison with positioning and movement of other organelle types in cells. Finally, recent data on melanosome-dependent organising of microtubules show that dynein is involved in nucleating microtubules extending from melanosome aggregates in melanophore fragments.

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