Summary
Two retinoids, all-trans-retinoic acid and a synthetic analog, TTNPB, were locally applied to different positions along the proximo-distal axis of embryonic chick wing buds using controlled release carriers. Truncations or limbs with duplicated structures across the antero-posterior axis develop after retinoid application to distal positions in buds from stage 20–24 embryos. Phocomelic limbs develop when the retinoids are applied more proximally to buds of stage 23–24 embryos. Duplications of the pattern of structures along the proximo-distal axis never occur.
Using TTNPB that is relatively stable, the amount of retinoid in the wing tissue when phocomelia is induced was measured. There is twice as much retinoid per cell in the proximal half of the bud as in the distal half of the bud. The concentration of TTNPB in proximal tissue is estimated to be three times higher than in distal tissue in which pattern formation and cartilage morphogenesis are relatively normal.
At early stages in the development of phocomelia, the shape of the bud changes and the indentation that marks the elbow does not arise. Neither retinoid-induced cell killing nor effects on the pattern of programmed cell death were detected.
The induction of phocomelia by retinoids appears to be based on effects on proximal cells, whereas retinoids produce pattern changes by acting on distal cells. Furthermore, compared with pattern changes, higher concentrations of retinoid in the bud tissue are required to produce phocomelia.
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Tickle, C., Crawley, A. The effects of local application of retinoids to different positions along the proximo-distal axis of embryonic chick wings. Roux's Arch Dev Biol 197, 27–36 (1988). https://doi.org/10.1007/BF00376038
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DOI: https://doi.org/10.1007/BF00376038