Workshop on hybrid and multiscale modelling in cell and cell population biology
Paris, France, 16-18 March 2015
Multi-scale models in cell biology are actively developed in order to describe physiological
processes. There are various approaches to multi-scale modelling and numerous applications.
Cell populations in multi-scale models can be described by discrete or continuous methods.
Among them are cellular automata, lattice Boltzmann methods and various particle methods.
These approaches allow a detailed description of cell behaviour, cell-cell interactions and
other aspects of complex biological media. On the other hand, such individual-based models
are applicable for a relatively small number of cells and they do not admit analytical
investigation. Continuous models are represented by ordinary and partial differential
equations for cell concentrations. In particular, these include reaction-diffusion equations,
which take into account random motion of cells, and their birth and death. Navier-Stokes
equations and Darcy equations describe convective motion of the medium. Other models
include physiologically structured integro-differential equations, in particular to describe nonlocal
non-spatial evolution phenomena in cell populations, such as carcinogenesis and drug
resistance in cancer.
Multi-scale models involve intracellular and extracellular regulations of biological cells.
Intracellular regulation is particularly important because it determines cell fate, that is the
choice between its proliferation (self-renewal), [de-]differentiation or senescence/apoptosis.
Cell fate can be described by ordinary differential equations for intracellular concentrations of
determinant proteins, by Boolean approaches or by probabilistic methods at the cell
population level when a small number of molecules participate in this regulation and when
their concentrations cannot be considered. Extracellular regulation can be effectuated by
various local mechanisms in a given tissue (growth factors, cytokines) or by means of global
control from other organs and tissues through endocrine signalling. Extracellular substances
diffuse in the tissue and influence intracellular regulation of cells. Distribution of these
substances can be described by reaction-diffusion equations when space is relevant to
describe tissue evolution (which is not necessarily the general case).
Cell populations, intracellular and extracellular regulations can also be modelled using hybrid
discrete-continuous methods. These describe cells as individual objects with various lattice or
off-lattice methods, intracellular regulatory networks with ordinary differential equations and
extracellular substances with partial differential equations. Such models are developed in
order to study differentiation in cell lineages, in particular for haematopoiesis and for other
physiological processes. They can take into account cell motion, division, death, interactions
with other cells and with the surrounding medium. Transition from hybrid to continuous
models can be justified for some model examples. Multi-scale models can manifest interesting
nonlinear dynamics, different from those obtained with classical reaction-diffusion equations.
This proposed workshop aims at bringing together teams working in multiscale modelling and
hybrid models in cell biology, involving mathematicians, physicists and biologists. It will
conclude the ANR “Bimod” research project (V. Volpert, J. Clairambault, P. Magal).
Mostafa Adimy, INRIA Dracula, Lyon
Loïc Barbarroux, INRIA Dracula, Lyon
Sébastien Benzekry, INRIA MC2, Bordeaux
Anass Bouchnita, Lyon
Helen Byrne, Mathematical Institute, University of Oxford
Mark Chaplain, Division of Mathematics, University of Dundee
Arnaud Chauvière, Université de Grenoble
Jean Clairambault, INRIA Mamba
Fabien Crauste, INRIA Dracula, Lyon
Marcello Delitala, Politecnico di Torino, Turin
Jacques Demongeot, Université de Grenoble
Andreas Deutsch, Technische Universität Dresden
Dirk Drasdo, INRIA Mamba
Florence Hubert, Institut de Mathématiques de Marseille
Tommaso Lorenzi, INRIA Mamba
Anna Marciniak-Czochra, Universität Heidelberg
Roeland Merks, CWI, Amsterdam
Roberto Natalini, IAC-CNR, Rome
Victor Pérez García, Universidad Castilla -La Mancha, Ciudad Realde préférence
Luigi Preziosi, Politecnico di Torino, Turin
Angélique Stephanou, TIMC-IMAG, Grenoble
Zuzanna Szymańska, Université de Varsovie
Alen Tosenberger, Bruxelles
Laura de Vargas Roditi, ETH Zürich
Vitaly Volpert, INRIA Dracula, Lyon
Romain Yvinec, INRA Tours
Jorge Zubelli, IMPA