Actin in cellular components of the basement membrane of the compound eye of a blowfly.

Abstract:

:The so-called 'basement membrane' of arthropod compound eyes is known to be of heterogeneous origin (Odselius and Eloffson 1981). A major contribution in Diptera with open rhabdoms is provided by a pigmented component which lies at the basal end of the extracellular space of each ommatidium and fills it, the glial plug. Ancillary components consist of the expanded tips of cone cell processes. Each glial plug exhibits two distinct regions: ramifying processes extend into the extracellular space and contain numerous pigment granules, while proximally the cytoplasm is devoid of granules but packed with bundles of cross-linked microfilaments that bind the fluorescent F-actin probe NBD-phallacidin strongly and antibodies to scallop actin weakly. Cone cell expansions also contain microfilaments and exhibit the same binding properties. The proximal faces of the cells of the glial plugs and of the cone cell expansions are covered with a coarsely fibrillar extracellular matrix. Some actin bundles appear to be attached to the plasma membranes at their ends, although the reality of this arrangement is still in question. Cellular components of the basement membrane are bonded together by their extracellular matrices, so that collectively they provide a reinforced network that retains the retina. Bundles of axons from the photoreceptors and tracheae that supply the retina with tracheoles pass through the spaces in this network.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Blest AD,De Couet HG

doi

10.1007/BF00222184

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

325-36

issue

2

eissn

0302-766X

issn

1432-0878

journal_volume

231

pub_type

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