Impact of receptor-ligand distance on adhesion cluster stability

• Verfasst von: Erdmann, Thorsten [VerfasserIn]
• Verfasst von: Schwarz, Ulrich S. [VerfasserIn]
• Titel: Impact of receptor-ligand distance on adhesion cluster stability
• Verf.angabe: Thorsten Erdmann and Ulrich S. Schwarz
• Jahr: 2007
• Umfang: 16 S.
• Teil: year:2007
• Teil: extent:16
• Fussnoten: Gesehen am 12.12.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 2007
• Band/Heft Quelle: (2007) Artikel-Nummer 0612457, 16 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Condensed Matter - Soft Condensed Matter
• Sach-SW: Condensed Matter - Materials Science
• Sach-SW: Quantitative Biology - Subcellular Processes
• K10plus-PPN: 1566263190

Abstract

Cells in multicellular organisms adhere to the extracellular matrix through two-dimensional clusters spanning a size range from very few to thousands of adhesion bonds. For many common receptor-ligand systems, the ligands are tethered to a surface via polymeric spacers with finite binding range, thus adhesion cluster stability crucially depends on receptor-ligand distance. We introduce a one-step master equation which incorporates the effect of cooperative binding through a finite number of polymeric ligand tethers. We also derive Fokker-Planck and mean field equations as continuum limits of the master equation. Polymers are modeled either as harmonic springs or as worm-like chains. In both cases, we find bistability between bound and unbound states for intermediate values of receptor-ligand distance and calculate the corresponding switching times. For small cluster sizes, stochastic effects destabilize the clusters at large separation, as shown by a detailed analysis of the stochastic potential resulting from the Fokker-Planck equation.