http://www.cnr.it/ontology/cnr/individuo/prodotto/ID12131
Skeletogenesis by transfated secondary mesenchyme cells is dependent on extracellular matrix-ectoderm interactions in Paracentrotus lividus sea urchin embryos. (Articolo in rivista)
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- Skeletogenesis by transfated secondary mesenchyme cells is dependent on extracellular matrix-ectoderm interactions in Paracentrotus lividus sea urchin embryos. (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
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- Kiyomoto M; Zito F; Costa C; Poma V; Sciarrino S; Matranga V (literal)
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- Titolo
- Skeletogenesis by transfated secondary mesenchyme cells is dependent on extracellular matrix-ectoderm interactions in Paracentrotus lividus sea urchin embryos. (literal)
- Abstract
- In the sea urchin embryo, primary mesenchyme cells (PMCs) are committed early in development to direct
skeletogenesis, provided that a permissive signal is conveyed from adjacent ectoderm cells. We showed that
inhibition of extracellular matrix (ECM)-ectoderm cells interaction, by monoclonal antibodies (mAb) to Plnectin,
causes an impairment of skeletogenesis and reduced expression of Pl-SM30, a spicule-specific matrix
protein. When PMCs are experimentally removed, some secondary mesenchyme cells (SMCs) switch to
skeletogenic fate. Here, for the first time we studied SMC transfating in PMC-less embryos of Paracentrotus
lividus. We observed the appearance of skeletogenic cells within 10 h of PMCs removal, as shown by binding
of wheat germ agglutinin (WGA) to cell surface molecules unique to PMCs. Interestingly, the number of WGApositive
cells, expressing also msp130, another PMC-specific marker, doubled with respect to that of PMCs
present in normal embryos, though the number of SM30-expressing cells remained constant. In addition, we
investigated the ability of SMCs to direct skeletogenesis in embryos exposed to mAbs to Pl-nectin after
removal of PMCs. We found that, although phenotypic SMC transfating occurred, spicule development, as
well as Pl-SM30-expression was strongly inhibited. These results demonstrate that ectoderm inductive signals
are necessary for transfated SMCs to express genes needed for skeletogenesis. (literal)
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