advanced practical courses & assistant researcher
cell adhesion forces
force measurements (AFM )
und Center for NanoScience
Phone: +49 (0) 89/ 2180-3133
Fax: +49 (0) 89/ 2180-3150
tuesday 14.30 - 17.00 p.m.
A Biophysical View on von Willebrand Factor Activation
Achim Löf, Jochen P. Müller, and Maria A. Brehm, Journal of Cellular Physiology,
doi: 10.1002/jcp.25887, March 2017
The process of hemostatic plug formation at sites of vascular injury crucially relies on the large multimeric plasma glycoprotein von Willebrand factor (VWF) and its ability to recruit platelets to the damaged vessel wall via interaction of its A1 domain with platelet GPIbα. Under normal blood flow conditions, VWF multimers exhibit a very low binding affinity for platelets. Only when subjected to increased hydrodynamic forces, which primarily occur in connection with vascular injury, VWF can efficiently bind to platelets. This force-regulation of VWF’s hemostatic activity is not only highly intriguing from a biophysical perspective, but also of eminent physiological importance... more PDF
Biophysical approaches promote advances in the understanding of von Willebrand factor processing and function
Löf A., Müller J.P., Benoit M., Brehm M.A., Advances in Biological Regulation 2017, Vol 63, pages 81-91.
The large multimeric plasma glycoprotein von Willebrand factor (VWF) is essential for primary hemostasis by recruiting platelets to sites of vascular injury. VWF multimers respond to elevated hydrodynamic forces by elongation, thereby increasing their adhesiveness to platelets. Thus, the activation of VWF is force-induced, as is its inactivation. Due to these attributes, VWF is a highly interesting system from a biophysical point of view, and is well suited for investigation using biophysical approaches. Here, we give an overview on recent studies that predominantly employed biophysical methods to gain novel insights into multiple aspects of VWF: Electron microscopy was used to shed light on the domain structure of VWF and the mechanism of VWF secretion... more PDF
pH-Dependent Interactions in Dimers Govern the Mechanics and Structure of von Willebrand Factor
Jochen P. Müller, Achim Löf, Salomé Mielke, Tobias Obser, Linda K. Bruetzel, Willem Vanderlinden, Jan Lipfert, Reinhard Schneppenheim, and Martin Benoit, Biophysical Journal, Volume 111, Issue 2, Pages 312–322, doi:10.1016/j.bpj.2016.06.022, 26 July 2016,
Von Willebrand factor (VWF) is a multimeric plasma glycoprotein that is activated for hemostasis by increased hydrodynamic forces at sites of vascular injury. Here, we present data from atomic force microscopy-based single-molecule force measurements, atomic force microscopy imaging, and small-angle x-ray scattering to show that the structure and mechanics of VWF are governed by multiple pH-dependent interactions with opposite trends within dimeric subunits. In particular, the recently discovered strong intermonomer interaction, which induces a firmly closed conformation of dimers and crucially involves the D4 domain... more PDF
Force sensing by the vascular protein von Willebrand factor is tuned by a strong intermonomer interaction
Jochen P. Müller, Salomé Mielke, Achim Löf, Tobias Obser, Christof Beer, Linda K. Bruetzel, Diana A. Pippig, Willem Vanderlinden, Jan Lipfert, Reinhard Schneppenheim, Martin Benoit
PNAS, doi: 10.1073/pnas.1516214113, January 2016
The large plasma glycoprotein von Willebrand factor (VWF) senses hydrodynamic forces in the bloodstream and responds to elevated forces with abrupt elongation, thereby increasing its adhesiveness to platelets and collagen. Remarkably, forces on VWF are elevated at sites of vascular injury, where VWF’s hemostatic potential is important to mediate platelet aggregation and to recruit platelets to the subendothelial layer... more PDF
Decoding Cytoskeleton-Anchored and Non-Anchored Receptors from Single-Cell Adhesion Force Data
Ediz Sariisik, Cvetan Popov, Jochen P. Müller, Denitsa Docheva, Hauke Clausen-Schaumann and Martin Benoit
Biophys J. 2015 Oct 6;109(7):1330-3. doi: 10.1016/j.bpj.2015.07.048
Complementary to parameters established for cell-adhesion force curve analysis, we evaluated the slope before a force step together with the distance from the surface at which the step occurs and visualized the result in a two-dimensional density plot. This new tool allows detachment steps of long membrane tethers to be distinguished from shorter jumplike force steps.... more PDF
Exponential size distribution of von Willebrand factor.
Lippok S, Obser T, Müller JP, Stierle VK, Benoit M, Budde U, Schneppenheim R, Rädler JO.
Biophys J. 2013 Sep 3;105(5):1208-16. doi: 10.1016/j.bpj.2013.07.037.
Von Willebrand Factor (VWF) is a multimeric protein crucial for hemostasis. Under shear flow, it acts as a mechanosensor responding with a size-dependent globule-stretch transition to increasing shear rates. Here, we quantify for the first time, to our knowledge, the size distribution of recombinant VWF and VWF-eGFP using a multilateral approach that involves quantitative gel analysis, fluorescence correlation spectroscopy, and total internal reflection fluorescence microscopy... more PDF
A practical guide to quantify cell adhesion using single-cell force spectroscopy.
Friedrichs J, Legate KR, Schubert R, Bharadwaj M, Werner C, Müller DJ, Benoit M.
Methods. 2013 Apr 1;60(2):169-78. doi: 10.1016/j.ymeth.2013.01.006. Epub 2013 Feb 8.
Quantitative analysis of cellular interactions with the extracellular environment is necessary to gain an understanding of how cells regulate adhesion in the development and maintenance of multicellular organisms, and how changes in cell adhesion contribute to diseases. We provide a practical guide to quantify the adhesive strength of living animal cells to various substrates using atomic force microscopy (AFM)-based single-cell force spectroscopy (SCFS)... more PDF
Vital dyes increase the rigidity of the internal limiting membrane
Haritoglou C, Mauell S, Benoit M, Schumann RG, Henrich PB, Wolf A and Kampik A
Eye advance online publication, 16 August 2013; doi:10.1038/eye.2013.178
To assess the stiffness of the natural human internal limiting membrane (ILM) and evaluate potential changes of the mechanical properties following staining with brilliant blue (BB) and indocyanine green (ICG).
Methods Unstained ILM specimens were obtained during ophthalmic surgical procedures. After removal, the specimens were dissected into five parts. .... more PDF
Increase in lens capsule stiffness caused by vital dyes
Christos Haritoglou, MD, Stephan Mauell, MSc, Ricarda G. Schumann, MD, Paul B. Henrich, MD, Armin Wolf, MD, Marcus Kernt, MD, Martin Benoit, PhD
J Cataract Refract Surg 2013; 39:1749–1752 Q 2013 ASCRS and ESCRS, doi:10.1016/j.jcrs.2013.02.057
Cataract surgery was among the first ophthalmic surgical procedures in which dyes were introduced to assist the surgeon in more challenging cases, such as eyes with mature cataract. In mature white cataracts, a controlled capsulorhexis of the anterior capsule is often difficult to performdue to absence of the red fundus reflex. .... more PDF
Probing the interaction forces of prostate cancer cells with collagen I and bone marrow derived stem cells on the single cell level.
Sarıısık E, Docheva D, Padula D, Popov C, Opfer J, Schieker M, Clausen-Schaumann H, Benoit M.
Published: March 5, 2013 DOI: 10.1371/journal.pone.0057706, PubMed PMID: 23472100
Adhesion of metastasizing prostate carcinoma cells was quantified for two carcinoma model cell lines LNCaP (lymph node-specific) and PC3 (bone marrow-specific). By time-lapse microscopy and force spectroscopy we found PC3 cells to preferentially adhere to bone marrow-derived mesenchymal stem cells (SCP1 cell line)... more PDF
Measuring cell adhesion forces: theory and principles.
Benoit M, Selhuber-Unkel C.
Methods Mol Biol;736:355-77. PubMed PMID: 21660737.
Cell adhesion is an essential prerequisite for survival, communication, and navigation of cells in organisms. It is maintained by the organized binding of molecules from the cell membrane to the extracellular space. This chapter focuses on direct measurements of cellular binding strength at the level of single adhesion molecules... more PDF
Force Spectroscopy on Cells.
M. Benoit, 2011
Chapter 9, in: handbook of nanophysics 7; 9:1-29; ISBN 978-1-4200-7546-5
... Physicists say: “a cell…” while biologists say, “we took an endothelial cell from
the upper third of the dorsal endometrium in the early S2-phase of a 12 days old male…” For a cell-adhesion measurement with molecular resolution, the biophysicist has a dilemma. The information from the individual adhesion molecule is embedded in the concert of all the participating molecules of the cell including
the membrane and the cytoskeleton... PDF
2009 Cuerrier CM, Benoit M, Guillemette G, Gobeil F Jr, Grandbois M.
Real-time monitoring of angiotensin II-induced contractile response and cytoskeleton remodeling in individual cells by atomic force microscopy.
PubMed PMID: 18953565. PDF
2008 Schmitz J, Benoit M and Gottschalk KE,
The viscoelasticity of membrane tethers and its importance for cell adhesion.
Biophys J, 95(3):1448–1459
PubMed PMID: 18456832 PDF
2008 Pamir E, George M, Fertig N, Benoit M.
Planar patch-clamp force microscopy on living cells.
PubMed PMID: 17933465. PDF
2007 Lugmaier RA, Schedin S, Kühner F, Benoit M.
Dynamic restacking of Escherichia coli P-pili.
Eur Biophys J;37(2):111-20.
PubMed PMID: 17554533. PDF
2006 Muñoz Javier A, Kreft O, Piera Alberola A, Kirchner C, Zebli B, Susha AS, Horn E, Kempter S, Skirtach AG, Rogach AL, Rädler J, Sukhorukov GB, Benoit M, Parak WJ.
Combined atomic force microscopy and optical microscopy measurements as a method to investigate particle uptake by cells.
PubMed PMID: 17193058. PDF
2006 Nüchter T, Benoit M, Engel U, Ozbek S, Holstein TW
Nanosecond-scale kinetics of nematocyst discharge.
2005 Lugmaier R, Hugel T, Benoit M and Gaub HE,
Phase contrast and DIC illumination for AFM hybrids.
PubMed PMID: 15961230. PDF
2005 Alon R, Feigelson SW, Manevich E, Rose DM, Schmitz J, Overby DR, Winter E, Grabovsky V, Shinder V, Matthews BD, Sokolovsky-Eisenberg M, Ingber DE, Benoit M, Ginsberg MH.J
Alpha4beta1-dependent adhesion strengthening under mechanical strain is regulated by paxillin association with the alpha4-cytoplasmic domain.
PubMed PMID: 16365170. PDF
2005 Neuert G, Kufer S, Benoit M and Gaub HE,
Modular multichannel surface plasmon spectrometer.
Review Of Scientific Instruments, 76(5):054303. PDF
2004 Blank K, Lankenau A, Mai T, Schiffmann S, Gilbert I, Hirler S, Albrecht C, Benoit M, Gaub HE and Clausen-Schaumann H,
Double-chip protein arrays: force-based multiplex sandwich immunoassays with increased specificity.
Analytical And Bioanalytical Chemistry, 379(7-8):974–981.
PubMed PMID: 15103448. PDF
2003 Blank K, Mai T, Gilbert I, Schiffmann S, Rankl J, Zivin R, Tackney C, Nicolaus T, Spinnler K, Oesterhelt F, Benoit M, Clausen-Schaumann H and Gaub HE,
A force-based protein biochip.
Proceedings Of The National Academy Of Sciences Of The United States Of America, 100(20):11,356–11360
PubMed PMID: 12975526; PDF
2002 Benoit M.
Cell adhesion measured by force spectroscopy on living cells.
Methods Cell Biol;68:91-114.
PubMed PMID: 12053742. PDF
2002 Benoit M and Gaub HE
Measuring cell adhesion forces with the atomic force microscope at the molecular level.
Cells Tissues Organs, 172(3):174–189
PubMed PMID: 12476047. PDF
2000 Benoit M, Gabriel D, Gerisch G and Gaub HE,
Discrete interactions in cell adhesion measured by single-molecule force spectroscopy.
Nature Cell Biology, 2(6):313–317
PubMed PMID: 10854320. PDF
2000 Dettmann W, Grandbois M, Andre S, Benoit M, Wehle A, Kaltner H, Gabius H and Gaub HE,
Differences in zero-force and force-driven kinetics of ligand dissociation from beta-galactoside-specific proteins (plant and animal lectins, immunoglobulin G) monitored by plasmon resonance and dynamic single molecule force microscopy.
Archives Of Biochemistry And Biophysics, 383(2):157–170
PubMed PMID: 11185549. PDF
2000 Grandbois M, Dettmann W, Benoit M and Gaub HE,
Affinity imaging of red blood cells using an atomic force microscope.
Journal Of Histochemistry & Cytochemistry, 48(5):719–724
PubMed PMID: 10769056. PDF
1998 Thie M, Rospel R, Dettmann W, Benoit M, Ludwig M, Gaub HE and Denker H,
Interactions between trophoblast and uterine epithelium: monitoring of adhesive forces.
Human Reproduction, 13(11):3211–3219
PubMed PMID: 9853883. PDF
1997 Benoit M, Holstein T and Gaub HE,
Lateral forces in AFM imaging and immobilization of cells and organelles.
European Biophysics Journal With Biophysics Letters, 26(4):283–290.
PubMed PMID: 17838043. PDF
1994 Holstein TW, Benoit M, Herder vG, Wanner G, David CN, Gaub HE
Fibrous Mini-Collagens in Hydra Nematocysts.