Journal
JOURNAL OF STRUCTURAL BIOLOGY
Volume 176, Issue 1, Pages 119-126Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2011.07.008
Keywords
Biomineralization; Sea urchin; Calcite; CaCO; 26Mg labeling; NanoSIMS; SEM
Funding
- CNRS
- Region Ile de France
- Ministere delegue a l'Enseignement superieur et a la Recherche
- Museum itself
- Polish Ministry of Science and Higher Education [N307-015733]
- European Research Council [246749]
- National Fund for Scientific Research (NFSR, Belgium) [2.4532.07]
- Foundation for Polish Science
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This paper reports the results of the first dynamic labeling experiment with regenerating spines of sea urchins Paracentrotus lividus using the stable isotope Mg-26 and NanoSIMS high-resolution isotopic imaging, which provide a direct information about the growth process. Growing spines were labeled twice (for 72 and 24 h, respectively) by increasing the abundance of Mg-26 in seawater. The incorporation of Mg-26 into the growing spines was subsequently imaged with the NanoSIMS ion microprobe. Stereom trabeculae initially grow as conical micro-spines, which form within less than 1 day. These micro-spines fuse together by lateral outgrowths and form a thin, open meshwork (inner stereom), which is subsequently reinforced by addition of layered thickening deposits (outer stereom). The (longitudinal) growth rate of the inner stereom is ca. 125 mu m/day. A single (ca. 1 mu m) thickening layer in the stereom trabeculae is deposited during 24 h. The thickening process is contemporaneous with the formation micro-spines and involves both longitudinal trabeculae and transverse bridges to a similar degree. Furthermore, the skeleton-forming cells remain active in the previously formed open stereom for at least 10 days, and do not migrate upwards until the end of the thickening process. The experimental capability presented here provides a new way to obtain detailed information about the skeleton formation of a multitude of marine, calcite producing organisms. (C) 2011 Elsevier Inc. All rights reserved.
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