आसंजन आवृत्ति के लिए परख स्वस्थानी में क्रॉस Junctional आण्विक सहभागिता के कैनेटीक्स विश्लेषण सेल सेल इंटरफेस पर
Summary
जब दोनों अणुओं बातचीत कोशिकाओं की सतहों पर लंगर डाले हैं रिसेप्टर ligand बातचीत कैनेटीक्स को मापने के लिए एक आसंजन आवृत्ति परख वर्णित है. यह यंत्रवत् आधारित परख रिसेप्टर्स और ligands बातचीत के रूप में micropipette दबाव मानव आसंजन सेंसर के रूप में लाल रक्त कोशिका और integrin αLβ2 और कहनेवाला आसंजन अणु 1 का उपयोग कर उदाहरण है.
Abstract
The micropipette adhesion assay was developed in 1998 to measure two-dimensional (2D) receptor-ligand binding kinetics1. The assay uses a human red blood cell (RBC) as adhesion sensor and presenting cell for one of the interacting molecules. It employs micromanipulation to bring the RBC into contact with another cell that expresses the other interacting molecule with precisely controlled area and time to enable bond formation. The adhesion event is detected as RBC elongation upon pulling the two cells apart. By controlling the density of the ligands immobilized on the RBC surface, the probability of adhesion is kept in mid-range between 0 and 1. The adhesion probability is estimated from the frequency of adhesion events in a sequence of repeated contact cycles between the two cells for a given contact time. Varying the contact time generates a binding curve. Fitting a probabilistic model for receptor-ligand reaction kinetics1 to the binding curve returns the 2D affinity and off-rate.
The assay has been validated using interactions of Fcγ receptors with IgG Fc1-6, selectins with glycoconjugate ligands6-9, integrins with ligands10-13, homotypical cadherin binding14, T cell receptor and coreceptor with peptide-major histocompatibility complexes15-19.
The method has been used to quantify regulations of 2D kinetics by biophysical factors, such as the membrane microtopology5, membrane anchor2, molecular orientation and length6, carrier stiffness9, curvature20, and impingement force20, as well as biochemical factors, such as modulators of the cytoskeleton and membrane microenvironment where the interacting molecules reside and the surface organization of these molecules15,17,19.
The method has also been used to study the concurrent binding of dual receptor-ligand species3,4, and trimolecular interactions19 using a modified model21.
The major advantage of the method is that it allows study of receptors in their native membrane environment. The results could be very different from those obtained using purified receptors17. It also allows study of the receptor-ligand interactions in a sub-second timescale with temporal resolution well beyond the typical biochemical methods.
To illustrate the micropipette adhesion frequency method, we show kinetics measurement of intercellular adhesion molecule 1 (ICAM-1) functionalized on RBCs binding to integrin αLβ2 on neutrophils with dimeric E-selectin in the solution to activate αLβ2.
Protocol
Discussion
सफलतापूर्वक micropipette आसंजन आवृत्ति परख कई महत्वपूर्ण कदम पर विचार करना चाहिए का उपयोग करें. सबसे पहले, ब्याज की रिसेप्टर ligand प्रणाली के लिए विशिष्ट बातचीत रिकॉर्ड करने के लिए सुनिश्चित करें. Nonspecific नियंत्रण …
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
इस अध्ययन NIH R01HL091020 अनुदान, R01HL093723, R01AI077343, और R01GM096187 द्वारा समर्थित किया गया.
Materials
| Name of the reagent | Company | Catalogue # | Comments |
|---|---|---|---|
| 10x PBS | BioWhittaker | 17-517Q |
Dilute to 1x with deionized water prior to use |
| Vacutainer EDTA | BD | 366643 | RBCs isolation |
| 10ML PK100 | |||
| Histopaque 1077 | Sigma-Aldrich | 10771 | RBCs isolation |
| Adenine | Sigma-Aldrich | A2786 | EAS-45 preparation |
| D-glucose (dextrose) | Sigma-Aldrich | G7528 | EAS-45 preparation |
| D-Mannitol | Sigma-Aldrich | 6360 | EAS-45 preparation |
| Sodium Chloride (NaCl) | Sigma-Aldrich | S7653 | EAS-45 preparation |
| Sodium Phosphate, Dibasic (Na₂HPO₄) | Fisher Scientific | S374 | EAS-45 preparation |
| L-glutamine | Sigma-Aldrich | G5763 | EAS-45 preparation |
| Biotin-X-NHS | Calbiochem | 203188 | RBCs biotinylation |
| Dimethylformamide (DMF) | Thermo Scientific | 20673 | RBCs biotinylation |
| Borate Buffer (0.1M) | Electron Microscopy Sciences | 11455-90 | RBCs biotinylation |
| Streptavidin | Thermo Scientific | 21125 | Ligand functionalizing |
| BSA | Sigma-Aldrich | A0336 | Ligand functionalizing |
| Quantibrite PE Beads | BD Biosciences | 340495 | Density quantification |
| Flow cytometer | BD Immunocytometry Systems | BD LSR II |
Density quantification |
Capillary Tube 0.7-1.0mm x 30" |
Kimble Glass Inc. | 46485-1 | Micropipette pulling |
| Mineral Oil | Fisher Scientific | BP2629-1 | Chamber assembly |
| Microscope Cover Glass | Fisher Scientific | 12-544-G | Chamber assembly |
PE α-human CD11a Clone HI 111 |
eBioscience | 12-0119-71 | Reagent for Fig.1 |
| PE anti-human CD54 | eBioscience | 12-0549 | Reagent for Fig.1 |
| Mouse IgG1 Isotype Control PE | eBioscience | 12-4714 | Reagent for Fig.1 |
| hydraulic micromanipulator | Narishige | MO-303 | Micropipette system |
| Mechanical manipulator | Newport | 461-xyz-m, SM-13, DM-13 | Micropipette system |
| piezoelectric translator | Physik Instrumente | P-840 | Micropipette system |
| LabVIEW | National Instruments | Version 8.6 | Micropipette system |
| DAQ board | National Instruments | USB-6008 | Micropipette system |
| Optical table | Kinetics Systems | 5200 Series | Micropipette system |
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