PMID: 9181550Apr 1, 1997Paper

Eggshells are shaped by a precise spatio-temporal arrangement of sequentially deposited macromolecules

Matrix Biology : Journal of the International Society for Matrix Biology
M S FernandezJ L Arias

Abstract

The avian eggshell is a composite bioceramic which is formed by a controlled interaction of an organic and an inorganic phase. The organic phase contains, among other constituents, type X collagen and proteoglycans, mainly keratan and dermatan sulfate. Understanding the principles governing the synthesis and temporo-spatial distribution of such macromolecules, and their influence on the organization of the crystalline phase, is an essential aspect of establishing the biological basis of the quality of eggshell, both as an embryonic chamber and as a natural food package. In the present study, we have examined the process of eggshell formation by immunohistochemistry, scanning electron microscopy and energy dispersive X-ray microanalysis. Precise sites and timing of secretion were established for the deposition of particular macromolecules. Type X collagen is detected at the very first moment of shell membrane formation. The appearance of keratan sulfate coincides with the appearance of mammillae, while dermatan sulfate is deposited later, coincident with shell matrix deposition. We propose that keratan sulfate, due to its precise localization, temporal appearance and calcium-binding affinity, relates to the maintenance of calciu...Continue Reading

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Citations

Nov 18, 2000·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·J C Marxen, W Becker
Sep 12, 2000·Matrix Biology : Journal of the International Society for Matrix Biology·M T HinckeY Nys
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