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The cytoskeleton of chick retinal pigment epithelial cells in situ

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Gelatin-coated slides were used to obtain en face preparations of retinal pigment epithelium (RPE) from 6-to 21-day-old chick embryos in order to study the distribution of F-actin in microfilaments (MF) and the MF-associated proteins, myosin, tropomyosin,α-actinin and vinculin in situ at different stages of development by fluorescence microscopy. The epithelial sheets were fixed in formaldehyde and then extracted in a solution containing 0.1% Triton X-100. NBD-Phallacidin was used to visualize the F-actin in MF, and antisera against myosin, tropomyosin,α-actinin and vinculin were used to determine the distribution of these four MF-associated proteins. F-actin, myosin, tropomyosin,α-actinin and vinculin were present in cortical rings around the apical ends of the RPE cells throughout this period of development. Of these proteins, only F-actin was identified in the apical processes of RPE cells. The increase in the amount of F-actin could be followed as the length and the number of apical processes increased with age and maturation of RPE cells. F-actin was first detected in numerous short apical processes on the surface of each RPE cell on day 12. From day 12 to day 17, they were at an intermediate stage of elongation and from day 17 onward all of the RPE cells had long F-actin-containing apical processes. These results indicate that the F-actin-containing MF assemble much later in the apical processes than in the cortical rings. Also the cortical rings and apical processes of RPE cells resemble those in absorptive intestinal cells in that the cortical rings in both cell types contain MF associated with myosin, tropomyosin,α-actinin and vinculin while the MF in the apical processes and microvilli lack these MF associated proteins, and both of these structures lack talin. In addition to apical processes and cortical rings, stained fibers were also observed at a level below the cortical rings. The simple and highly reproducible en face method described is useful for determining changes in the organization of cytoskeletal components and other macromolecules in RPE cells and other epithelial cells in situ.

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Author notes

  1. Kursad Turksen

    Present address: MRC Group in Periodontal Physiology, University of Toronto, M5S 1A8, Toronto, Canada

Authors and Affiliations

  1. Department of Anatomy, University of Toronto, Toronto, Canada

    Kursad Turksen &  Vitauts I. Kalnins

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  1. Kursad Turksen
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  2. Vitauts I. Kalnins
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Turksen, K., Kalnins, V.I. The cytoskeleton of chick retinal pigment epithelial cells in situ. Cell Tissue Res. 248, 95–101 (1987). https://doi.org/10.1007/BF01239968

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  • DOI: https://doi.org/10.1007/BF01239968

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