کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10160473 | 123 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Protrusion force transmission of amoeboid cells crawling on soft biological tissue
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
We applied a colloidal force microscopy technique to measure the spreading and retraction forces generated by protrusions (pseudopodia) of vegetative amoeboid cells (Dictyostelium discoideum) adhering on soft tissue analogues composed of 2-mm thick hydrogels of hyaluronic acid exhibiting Young's moduli between 10 and 200 Pa. Local shear deformations of the polymer films evoked by magnetic tweezers and by cellular protrusions were determined by analyzing the deflections of colloidal beads randomly deposited on the surface of the polymer cushions, which enabled us to measure forces generated by advancing (“pushing” forces) and retracting (“pulling” forces) protrusions in a direct way. We found that the maximum amplitudes generated by the advancing protrusions (pushes) decrease with increasing stiffness of the HA substrate while the amplitudes of the retractions do not show such a dependence. The maximum forces transmitted by the advancing and retracting protrusions increase with increasing stiffness of the HA films (from 0.02 to 1 nN for the case of pushing). The protrusions spread or retract with constant velocities which are higher for retractions (100 nm sâ1) than for spreadings (50 nm sâ1) and are not significantly influenced by the substrate rigidity. We provide evidence that elastic equilibrium during protrusion formation and retraction is maintained by local elastic dipole fields generated at the rim of the protrusions. A model of protrusion force transmission by coupling of growing actin gel in the cytoplasm of the protrusions to cell surface receptors through talin clutches is proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Biomaterialia - Volume 1, Issue 5, September 2005, Pages 485-497
Journal: Acta Biomaterialia - Volume 1, Issue 5, September 2005, Pages 485-497
نویسندگان
Guy Ladam, Laurent Vonna, Erich Sackmann,