Ultrastructure and cytochemistry of the early calcification site and of its mineralization organic matrix in Paracentrotus lividus (Echinodermata: Echinoidea) |
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| Authors: | L Ameye Philippe Compère Jean Dille Philippe Dubois |
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| Institution: | (1) Laboratoire de Biologie marine (CP 160/15), Université Libre de Bruxelles, 50, Avenue F.D. Roosevelt, B-1050 Bruxelles, Belgium Tel +32-2-6502970; fax +32-2-6502796 e-mail lameye@ulb.ac.be, BE;(2) Laboratoire de Biologie générale et de Morphologie ultrastructurale, Université de Liège, 22, Quai Ed. van Beneden, B-4020 Liège, Belgium, BE;(3) Service de Métallurige physique (CP 194/03), Université Libre de Bruxelles, 50, Avenue F.D. Roosevelt, B-1050 Bruxelles, Belgium, BE |
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| Abstract: | The ultrastructure and cytochemistry of skeleton formation sites prior to mineralization are described for the first time
in echinoderms. These early sites are intracellular vacuoles located in syncytial pseudopodia of skeleteton-forming cells.
They contain a mineralization organic matrix, which shows a calcium-binding ability and is framed in a tridimensional structure
made of concentric layers bridged by radial threads. This organic matrix presents repetitive structures which could be implicated
in mineralization control. Both the tridimensional organization of the organic matrix and its framing, before mineralization
starts, question the current theories which suggest that the echinoderm organic matrix is soluble at the onset of mineralization
and adsorbs on the forming crystal.
Accepted: 19 March 1998 |
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