Publication: Fine autoradiographical study on scale morphogenesis in the regenerating tail of lizards
Authors
Alibardi, Lorenzo
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Regenerating scales in lizards originate as
pockets in the epidermis instead of epidermal elevations
as during embryo development. The morphogenesis of
scales in the regenerating tail of the lizards. Anolis and
Lamphropholis was studied after peritoneal injection of
3~-thymidineT. he tracer was localized in the forming
epidermis after progressive post-injection times, by
means of autoradiographY on plastic sections. After 4-5 hours post-injection of H-thymidine, the radioactivity
was localized in the basal layer. After 2 to 4 days postinjection
labelled cells were seen in the basal and
intermediate spinosus layers but not in the uppermost
keratinizing layers. Labelled cells were seen in the
differentiating cornifying layers (pre-B and pre-a) 6-8
days post-injection. At 12-14 days post-injection almost
no radioactivity was seen in the basal layer or in the
living part of the epidermis. A few labelled cells were
present in the dense keratinizing layers of the sloughing
wound and interscale lacunar layers. This study shows
that scale formation and morphogenesis in the
regenerating tail is brought about by a localized cell
proliferation along the regenerating epidermis. In the
forming scales the percentage of labelled cells in the
distal side (future dorsal part of the new scale) is much
higher than in the proximal side (the future ventral side
of the scale), so that overlapped scales are generated.
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