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The effects of human leukemia inhibitory factor (hLIF) and culture medium on in vitro differentiation of cultured porcine inner cell mass (pICM)

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Summary

Isolation and maintenance of porcine embryonic stem (pES) cells have been hindered by the inability to inhibit differentiation of the porcine inner cell mass (pICM) in vitro. Culture conditions currently in use have been developed from mouse ES cell culture and are not effective for maintaining the pICM. Optimizing culture conditions for the pICM is essential. We have developed a grading system to detect changes in the differentiation status of in vitro cultured pICM. Porcine ICMs (Day 7) were isolated by immunosurgery and cultured for 4 d in either Dulbecco’s modified Eagle’s medium (DMEM)-based medium (D medium) or DMEM/Ham’s F-10 (1:1)-based medium (D/H medium) with or without human Leukemia Inhibitory Factor (hLIF, 1000 iu/ml). Colonies were photographed daily for morphological analysis. pICMs were categorized into one of two types based on their morphological profile: type A, nonepithelial or type B, epithelial-like. Eight investigators evaluated pICM differentiation using standardized differentiation profiles. Each pICM series was graded on a scale of 1 (fully undifferentiated) to 5 (fully differentiated) for each time point. Differentiation was verified by alkaline phosphatase activity, cytokeratin staining, and scanning electron microscopy. Neither hLIF nor culture medium delayed differentiation of pICMs (P=0.08 and P=0.25, respectively). The grading system employed was an effective tool for detecting treatment effects on differentiation of the developing pICM. These results demonstrate that hLIF cannot significantly inhibit differentiation of the pICM, and is unlikely to assist in porcine ES cell isolation. Future experiments utilizing homologous cytokines may prove more beneficial.

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Authors and Affiliations

  1. Department of Veterinary Anatomy and Public Health, College of Veterinary Medicine, and Center for Animal Biotechnology, Institute for Bioscience and Technology (IBT), Texas A&M University, 77843, College Station, Texas

    Karen Moore & Jorge A. Piedrahita

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  1. Karen Moore
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  2. Jorge A. Piedrahita
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Moore, K., Piedrahita, J.A. The effects of human leukemia inhibitory factor (hLIF) and culture medium on in vitro differentiation of cultured porcine inner cell mass (pICM). In Vitro Cell.Dev.Biol.-Animal 33, 62–71 (1997). https://doi.org/10.1007/s11626-997-0023-4

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  • DOI: https://doi.org/10.1007/s11626-997-0023-4

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