Publication: The retinal pigment epithelium of the teleost Notopterus notopterus (Pallas): Appearance of basal infoldings
during prolonged dark-adaptation
Authors
Nag, T.C.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
In teleosts, the basal part of the retinal
pigment epithelium (RPE) is relatively smooth, i. e., it is
free of basal membrane infoldings. In the featherback,
Notopterus notopterus, whereas this is the situation in
light adaptation, during dark-adaptation, especially when
kept for prolonged periods (6-9 hour), numerous
infoldings appear at the basal region, as found uniquely
by transmission electron microscopy. In this teleost,
during retinomotor movements, the rods move vitreally
during dark-adaptation, while the cones do not elongate,
and remain stationary in both light- and dark- adaptation.
The significance of the appearance of basal infoldings in
dark-adapted RPE is explained in terms of the pattern of
retinomotor responses and the features of RPE and
photoreceptors in this species. It is suggested that (1) the
thick, impervious tapetal layer present in the RPE, (2)
the unusual position of the photoreceptors in the visual
cell layer of dark-adapted retina, and (3) the presumably
high demand for glucose and O2 of the outer retina
during dark-adaptation might contribute to cause this
phenomenon in this species. The available evidence tend
to associate this phenomenon with the involvement of
the RPE in nutrient and O2 delivery to the
photoreceptors via the basal infoldings of the RPE in
dark-adapted state in this species. This has not been
reported for any other teleosts to date.
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Citation
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