[Regionalization of the expression of tenascin as a response to the inducers of mesoderm].
Tenascin (TN) is an extracellular matrix (ECM) glycoprotein which possesses antiadhesive properties and thus is able to modulate cell interactions with molecules of the ECM. In Xenopus embryos, TN is expressed dorsally in a very restricted pattern. We have studied the distribution of TN mRNA in tailbud-stage embryos by in situ hybridization. We show that TN transcripts are principally expressed in myotome cells. No TN mRNA could be detected in lateral plate mesoderm. This had led us to study TN expression in response to mesodermal inducers. Analysis of the distribution of TN after mesodermal induction of blastula animal caps with activin A and bFGF or after ectopic expression of XBra shows that TN expression is elicited when dorsal or posterior structures are formed. Our results show that TN regionalization in Xenopus embryos depends on mesoderm patterning.
Umbhauer
M
M
Laboratoire de Biologie Expérimentale, URA 1135 CNRS, Université Pierre et Marie Curie, Paris, France.
Riou
J F
JF
Boucaut
J C
JC
D028341:Activins; D000818:Animals; D015816:Cell Adhesion Molecules, Neuronal / Q000032:analysis / Q000235:genetics*; D004627:Embryonic Induction / Q000187:drug effects / Q000235:genetics; D016326:Extracellular Matrix Proteins / Q000032:analysis / Q000235:genetics*; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology; D015870:Gene Expression; D007265:Inhibins / Q000494:pharmacology; D008648:Mesoderm; D012333:RNA, Messenger; D019063:Tenascin; D014981:Xenopus
D015816:Cell Adhesion Molecules, Neuronal; D016326:Extracellular Matrix Proteins; D012333:RNA, Messenger; D019063:Tenascin; D016222:Fibroblast Growth Factor 2; D028341:Activins; D007265:Inhibins