Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
XB-ART-20868
Int J Dev Biol September 1, 1994; 38 (3): 439-46.

Transient expression of SPARC in the dorsal axis of early Xenopus embryos: correlation with calcium-dependent adhesion and electrical coupling.

Damjanovski S , Malaval L , Ringuette MJ .


Abstract
Our comprehension of the molecular mechanisms underlying embryogenesis has been greatly enhanced by the identification and characterization of associated extracellular matrix macromolecules. Using Xenopus laevis as a model, we investigated the expression and distribution of SPARC (Secreted Protein, Acidic, Rich in Cysteine; also called osteonectin and BM-40) during early embryonic development. SPARC has been found to be enriched in tissues undergoing rapid morphological development, differentiation, and remodeling. In Xenopus, SPARC transcripts are first expressed by primordial cells which give rise to the first embryonic tissues, the notochord and somites. SPARC RNA levels remained high throughout the rapid morphological development and differentiation phase of these tissues, and then rapidly decreased. Of particular interest, SPARC protein began to accumulate within the intersomitic clefts at the onset of trunk myotome contraction. The intersomitic enrichment of SPARC remained high as long as the myotomes remained electrically coupled, principally by gap junctions. As myotomes became innervated, SPARC expression decreased dramatically within the somites. SPARC was also found to be enriched within other tissues, such as the neural tube and epidermis. In addition, the selective spatial-temporal enrichment of SPARC suggests it makes important calcium-dependent contributions to early morphological development.

PubMed ID: 7848827
Article link: Int J Dev Biol

Genes referenced: actg1 actl6a lsamp sparc
Antibodies: Lsamp Ab1 Sparc Ab1


Article Images: [+] show captions


Xenbase: The Xenopus Model Organism Knowledgebase.
Version: 4.15.0
Major funding for Xenbase is provided by grant P41 HD064556