Download Publications de l`équipe - Centre de recherche de l`Institut Curie

Publications de l’équipe
Mécanique du développement mammifère
Année de publication : 2011
Jean-Léon Maître, Carl-Philipp Heisenberg (2011 Aug 3)
The role of adhesion energy in controlling cell-cell contacts.
Current opinion in cell biology : 508-14 : DOI : 10.1016/j.ceb.2011.07.004
Résumé
Recent advances in microscopy techniques and biophysical measurements have provided
novel insight into the molecular, cellular and biophysical basis of cell adhesion. However,
comparably little is known about a core element of cell-cell adhesion–the energy of adhesion
at the cell-cell contact. In this review, we discuss approaches to understand the nature and
regulation of adhesion energy, and propose strategies to determine adhesion energy
between cells in vitro and in vivo.
Richard H Row, Jean-Léon Maître, Benjamin L Martin, Petra Stockinger, Carl-Philipp Heisenberg,
David Kimelman (2011 Apr 6)
Completion of the epithelial to mesenchymal transition in zebrafish mesoderm
requires Spadetail.
Developmental biology : 102-10 : DOI : 10.1016/j.ydbio.2011.03.025
Résumé
The process of gastrulation is highly conserved across vertebrates on both the genetic and
morphological levels, despite great variety in embryonic shape and speed of development.
This mechanism spatially separates the germ layers and establishes the organizational
foundation for future development. Mesodermal identity is specified in a superficial layer of
cells, the epiblast, where cells maintain an epithelioid morphology. These cells involute to
join the deeper hypoblast layer where they adopt a migratory, mesenchymal morphology.
Expression of a cascade of related transcription factors orchestrates the parallel genetic
transition from primitive to mature mesoderm. Although the early and late stages of this
process are increasingly well understood, the transition between them has remained largely
mysterious. We present here the first high resolution in vivo observations of the blebby
transitional morphology of involuting mesodermal cells in a vertebrate embryo. We further
demonstrate that the zebrafish spadetail mutation creates a reversible block in the
maturation program, stalling cells in the transition state. This mutation creates an ideal
system for dissecting the specific properties of cells undergoing the morphological transition
of maturing mesoderm, as we demonstrate with a direct measurement of cell-cell adhesion.
Année de publication : 2009
Elena Kardash, Michal Reichman-Fried, Jean-Léon Maître, Bijan Boldajipour, Ekaterina Papusheva,
Esther-Maria Messerschmidt, Carl-Philipp Heisenberg, Erez Raz (2009 Dec 17)
INSTITUT CURIE, 20 rue d’Ulm, 75248 Paris Cedex 05, France | 1
Publications de l’équipe
Mécanique du développement mammifère
A role for Rho GTPases and cell-cell adhesion in single-cell motility in vivo.
Nature cell biology : 47-53; sup pp 1-11 : DOI : 10.1038/ncb2003
Résumé
Cell migration is central to embryonic development, homeostasis and disease, processes in
which cells move as part of a group or individually. Whereas the mechanisms controlling
single-cell migration in vitro are relatively well understood, less is known about the
mechanisms promoting the motility of individual cells in vivo. In particular, it is not clear how
cells that form blebs in their migration use those protrusions to bring about movement in the
context of the three-dimensional cellular environment. Here we show that the motility of
chemokine-guided germ cells within the zebrafish embryo requires the function of the small
Rho GTPases Rac1 and RhoA, as well as E-cadherin-mediated cell-cell adhesion. Using
fluorescence resonance energy transfer we demonstrate that Rac1 and RhoA are activated in
the cell front. At this location, Rac1 is responsible for the formation of actin-rich structures,
and RhoA promotes retrograde actin flow. We propose that these actin-rich structures
undergoing retrograde flow are essential for the generation of E-cadherin-mediated traction
forces between the germ cells and the surrounding tissue and are therefore crucial for cell
motility in vivo.
Année de publication : 2008
Clotilde Billottet, Patricia Rottiers, Florence Tatin, Christine Varon, Edith Reuzeau, Jean-Léon
Maître, Frédéric Saltel, Violaine Moreau, Elisabeth Génot (2008 Apr 10)
Regulatory signals for endothelial podosome formation.
European journal of cell biology : 543-54 : DOI : 10.1016/j.ejcb.2008.02.006
Résumé
Podosomes are punctate actin-rich adhesion structures which spontaneously form in cells of
the myelomonocytic lineage. Their formation is dependent on Src and RhoGTPases. Recently,
podosomes have also been described in vascular cells. These podosomes differ from the
former by the fact that they are inducible. In endothelial cells, such a signal can be provided
by either constitutively active Cdc42, the PKC activator PMA or TGFbeta, depending on the
model. Consequently, other regulatory pathways have been reported to contribute to
podosome formation. To get more insight into the mechanisms by which podosomes form in
endothelial cells, we have explored the respective contribution of signal transducers such as
Cdc42-related GTPases, Smads and PKCs in three endothelial cell models. Results presented
demonstrate that, in addition to Cdc42, TC10 and TCL GTPases can also promote podosome
formation in endothelial cells. We also show that PKCalpha can be either necessary or
entirely dispensable, depending on the cell model. In contrast, PKCdelta is essential for
podosome formation in endothelial cells but not smooth muscle cells. Finally, although
podosomes vary very little in their molecular composition, the signalling pathways involved
in their assembly appear very diverse.
INSTITUT CURIE, 20 rue d’Ulm, 75248 Paris Cedex 05, France | 2
Publications de l’équipe
Mécanique du développement mammifère
INSTITUT CURIE, 20 rue d’Ulm, 75248 Paris Cedex 05, France | 3