Statistical mechanics of non-muscle Myosin IIA in human bone marrow-derived mesenchymal stromal cells seeded in a collagen scaffold : a thermodynamic near-equilibrium linear system modified by the tripeptide Arg-Gly-Asp (RGD)

Lecarpentier, Yves; Kindler, Vincent; Krokidis, Xenophon; Bochaton-Piallat, Marie-Luce; Claes, Victor; Hebert, Jean-Louis; Vallee, Alexandre; Schussler, Olivier

doi:10.3390/CELLS9061510

Title

Statistical mechanics of non-muscle Myosin IIA in human bone marrow-derived mesenchymal stromal cells seeded in a collagen scaffold : a thermodynamic near-equilibrium linear system modified by the tripeptide Arg-Gly-Asp (RGD)

Author

Lecarpentier, Yves

Kindler, Vincent

Krokidis, Xenophon

Bochaton-Piallat, Marie-Luce

Claes, Victor

Hebert, Jean-Louis

Vallee, Alexandre

Schussler, Olivier

Abstract

Mesenchymal stromal cells (MSCs) were obtained from human bone marrow and amplified in cultures supplemented with human platelet lysate. Once semi-confluent, cells were seeded in solid collagen scaffolds that were rapidly colonized by the cells generating a 3D cell scaffold. Here, they acquired a myofibroblast phenotype and when exposed to appropriate chemical stimulus, developed tension and cell shortening, similar to those of striated and smooth muscle cells. Myofibroblasts contained a molecular motor-the non-muscle myosin type IIA (NMMIIA) whose crossbridge (CB) kinetics are dramatically slow compared with striated and smooth muscle myosins. Huxley's equations were used to determine the molecular mechanical properties of NMMIIA. Thank to the great number of NMMIIA molecules, we determined the statistical mechanics (SM) of MSCs, using the grand canonical ensemble which made it possible to calculate various thermodynamic entities such as the chemical affinity, statistical entropy, internal energy, thermodynamic flow, thermodynamic force, and entropy production rate. The linear relationship observed between the thermodynamic force and the thermodynamic flow allowed to establish that MSC-laden in collagen scaffolds were in a near-equilibrium stationary state (affinity MUCH LESS-THAN RT), MSCs were also seeded in solid collagen scaffolds functionalized with the tripeptide Arg-Gly-Asp (RGD). This induced major changes in NMMIIA SM particularly by increasing the rate of entropy production. In conclusion, collagen scaffolds laden with MSCs can be viewed as a non-muscle contractile bioengineered tissue operating in a near-equilibrium linear regime, whose SM could be substantially modified by the RGD peptide.

Language

English

Source (journal)

Cells

Publication

2020

ISSN

2073-4409

DOI

10.3390/CELLS9061510

Volume/pages

9 :6 (2020) , 14 p.