Abstract
Culturing pluripotent embryonic stem cells represents a unique model system for in vitro studies of embryo cell growth and differentiation, and represents a connection between in vitro and in vivo manipulation of genes. To further develop and refine stem cell technology for marine fish, we have established cultures of embryonic stem cells isolated from turbot blastulas. The pluripotent nature of our turbot-ES-like cells was supported by their morphology and elevated levels of alkaline phosphatase enzyme activity, their ability to remain undifferentiated for a prolonged culture period, their spontaneous differentiation potential in vitro and their ability to form embryoid bodies (EB) in response to changes in the extracellular environment. In addition, we show that turbot ES like cells express Oct-4 required for the maintenance of pluripotency of ES cells.
Cells from 100 blastulas (>105 cells/well) were seeded into gelatine coated 24 well cell culture clusters. The cells were polygonal in shape, with dense cytoplasm and large nuclei. The ES-like cells formed colonies within 24 h following seeding, multilayered in a pyramidal fashion, with maximum cell densities in the middle. The cells proliferated vigorously when seeding densities were high and the cells still had not attached to the gelatine-coated surface. Most of the cells became attached to the surface 48 h following seeding. Attached cells grew more slowly and 20% of the plated colonies could be kept stable for 60 days. Eventually, most of the cultures showed extensive differentiation or died. Only a few cultures (4–5%) survived prolonged culturing (>2 months). The cells were stained for alkaline phosphatase activity, a marker of pluripotency and showed intense staining. More specific, turbot ES like cells in culture expressed Oct-4, detected by immunofluorescence staining.
Changing the medium conditions by adding retinoic acid and removing LIF, the proportion of embryoid bodies in our cultures increased. ES-like cells as well as fresh, intact fertilised eggs where successfully cryopreserved. ES cells from the cryopreserved eggs could be isolated and seeded into cultures, forming colonies like the cells from freshly fertilised eggs. Also cryopreserved ES-like cells could be successfully plated. The prolonged survival of these cryopreserved cells has not yet been investigated. The establishment of in vitro cultures of turbot ES-like cells represents a new experimental model for marine flatfish.
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Holen, E., Hamre, K. Towards obtaining long term embryonic stem cell like cultures from a marine flatfish, Scophtalmus maximus . Fish Physiology and Biochemistry 29, 245–252 (2003). https://doi.org/10.1023/B:FISH.0000045725.01192.44
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DOI: https://doi.org/10.1023/B:FISH.0000045725.01192.44