Live-cell imaging demonstrates rapid cargo exchange between lipid droplets in adipocytes |
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Authors: | Somwar Romel Roberts Charles T Varlamov Oleg |
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Institution: | Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, United States. |
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Abstract: | Lipid droplets form the storage reservoirs for lipids in adipocytes, and their stable appearance suggests a static nature of lipid storage. A stable lipid store, however, may be maintained through the dynamic recycling of lipid cargo between the cytoplasmic compartment and the lipid droplet. In this study, we applied live-cell microscopy to follow intracellular transport steps of fluorescently labeled fatty acids in differentiated 3T3-L1 adipocytes. We demonstrate that intracellular lipids continuously exit and re-enter lipid droplets, and that individual lipid droplets exchange their content on a timescale of minutes. These data demonstrate a surprisingly high rate of intracellular lipid turnover in adipocytes and support the novel concept that lipid storage is achieved by dynamic recycling rather than static retention. |
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