Seminars

PMMH’s weekly seminar is held every Friday at 11 am (map)

Contact :
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
responsables-seminaires (arobase) pmmh.espci.fr

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22


Séminaire PMMH - Avin Babataheri (Ladhyx)

Vendredi 20 septembre 2024 de 11h00 à 12h00 - Salle réunion PMMH 1

1D confinement controls cell shape and migration

Pericytes are mural cells of the microvasculature, they wrap around small vessels, support the vessels mechanically and participate in blood flow regulation.

Pericytes are distinguished by two main characteristics ; first their distinct morphology, which has been likened to a “bump on a log”, as they present long processes spanning along the axis of the vessels they adhere to, and a protruding soma that houses the nucleus. The second characteristic is their distribution along the microvascular tree in a cellular chain where each cell occupies its own territory. This spatial distribution is established by cell migration during the embryonic stage and maintained through controlled motility in the adult.

Because of their position in the microvascular tree, pericytes experience extreme lateral and longitudinal confinement, we hypothesize that the confinement impacts their morphology. Although pericyte shape is key for their function during vascular regulation, the manner in which pericyte morphology is associated with migration and function remains unknown.

In this project, we use micropatterns to mimic pericyte adhesion to microvessels, we show that lateral confinement controls cell shape and produces in vivo-like phenotypes. We study pericyte migration on both laterally confining lanes, and longitudinally constraining motifs and propose a model that describes their kinetics as a stochastic motion with dry friction.

In vivo pericytes can bridge nearby capillaries, we show that in vitro pericytes are also capable of crossing gaps of different sizes. The percentage of crossings is correctly predicted by the likelihood of a fluctuating system to overcome an energy barrier. Our joint experimental and theoretical approach demonstrates the effect of in vivo-like geometrical confinement on pericyte morphology and migration.

Top







Seminars  (8)

  • Séminaire PMMH - Ludovic Berthier, Gulliver
    Vendredi 24 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
    Emerging active turbulence and chaotic advection in dense active matter
    I will show that active mesoscale flows, a.k.a. active turbulence, leading to chaotic advection generically emerge in simple models of active particles leading to streams and vortices reminiscent of multiscale flow patterns in turbulence. The characteristics of these flows do not depend on the specific details of (…)
  • Séminaire PMMH - Ludovic Berthier, Gulliver
    Vendredi 24 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
    Emerging active turbulence and chaotic advection in dense active matter
    I will show that active mesoscale flows, a.k.a. active turbulence, leading to chaotic advection generically emerge in simple models of active particles leading to streams and vortices reminiscent of multiscale flow patterns in turbulence. The characteristics of these flows do not depend on the specific details of (…)
  • Séminaire PMMH - Elisabeth Lemaire (INPHYNI, Nice)
    Vendredi 31 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
  • Séminaire PMMH - Elisabeth Lemaire (INPHYNI, Nice)
    Vendredi 31 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
    Origins of shear-thinning in non-Brownian suspensions
    The rheology of concentrated non-Brownian suspensions has undergone a small revolution in the last 15 years when the importance of the role played by solid contacts between particles was realized. Considering these contacts has allowed to explain the continuous or discontinuous shear-thickening in dense suspensions (…)
  • Séminaire PMMH - Chandan Bose (Univ. Birmingham)
    Vendredi 7 février de 11h00 à 12h00 - Salle réunion PMMH 1
    From Nature to Simulation : Vortex-Dominated Flows and Bioinspired Fluid-Structure Interaction Systems
    In this presentation, I will provide an overview of the ongoing research in my group at the University of Birmingham on the computational modelling of biomimetic engineering systems. These systems leverage advanced numerical methods to simulate and analyze vortex-dominated fluid flows inspired by biological (…)
  • Séminaire PMMH - Christophe Denoual, CEA
    Vendredi 14 février 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
  • Séminaire PMMH - Christophe Denoual, CEA
    Vendredi 14 février de 11h00 à 12h00 - Salle réunion PMMH 1
  • Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
    Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
    REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
    The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…)

Information for the speakers

The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.

Link to cofee seminar (internal, every Thursday)


Top



Practical information

Laboratoire : 01 40 79 45 22
Directeur : Ramiro GODOY DIANA
Codirecteur : Laurent DUCHEMIN
Administratrice : Frédérique AUGER (01 40 79 45 22)
Gestionnaire : Claudette BAREZ (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr