ACTIN-FILAMENTS IN APICAL PROJECTIONS OF PRIMATE PIGMENTED EPITHELIAL-CELL

  • 1 January 1976
    • journal article
    • research article
    • Vol. 15  (7) , 570-575
Abstract
A highly-ordered array of filaments was found within the apical processes of retinal pigmented epithelial cells in monkeys [Saimiri sciureus] and humans. These filaments, approximately 100 .ANG. in diameter and 250 .ANG. apart, lined the cytoplasmic face of the plasma membrane, in parallel with the long axis of the apical processes. Since these filaments bound rabbit myosin subfragment-1 to form arrowhead complexes, they may contain actin. Such membrane-bound actin filaments could have any of several different functions: they could stabilize the apical projections and by so doing play a cytoskeletal role, and/or they could take part in the phagocytosis of shed outer segment discs.

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