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Biological Description
| Specificity | Integrin αVβ3 Antibody [C22M19] detects endogenous levels of total Integrin αVβ3 protein. |
|---|---|
| Background | Integrin αVβ3, a promiscuous RGD-binding heterodimeric adhesion receptor ubiquitously expressed on endothelial cells, platelets, osteoclasts, and tumour cells, assembles a headpiece with αV's seven-bladed β-propeller and thigh domains atop β3's βI (vWFA-like with metal ion-dependent adhesion site, MIDAS), hybrid, and PSI domains, extended via calf-1/2 (αV) and EGF-like IE1-4 plus β-tail (β3) legs bent at genuflexed knees in the low-affinity closed conformation, with short transmembrane helices and cytoplasmic tails enabling talin-mediated inside-out activation. Ligand engagement at the αV propeller-βI interface (coordinated by Mn²⁺/Mg²⁺/Ca²⁺ at MIDAS, ADMIDAS, and LIMBS) triggers headpiece opening (~130° swing), knee extension, and rigid-body separation of α/β TM helices, propagating "switchblade-like" conformational waves that cluster receptors into high-avidity states for firm adhesion while recruiting FAK/Src/paxillin to activate PI3K/Akt, MAPK/ERK, and Rho GTPase pathways driving angiogenesis, migration, survival, and matrix remodelling; conversely, outside-in signalling via force-dependent catch bonds (~10-fold affinity increase under shear) reinforces cytoskeletal anchorage. Dysregulated αVβ3 promotes pathological neovascularisation in tumours/age-related macular degeneration, osteoclast-mediated bone resorption in osteoporosis, thrombosis via platelet aggregation on vitronectin/fibronectin, and arterial remodelling in atherosclerosis, while therapeutic antagonists or mutations disrupting the IE2-thigh interface impair activation and suppress these processes. |
Usage Information
| Application | IP, IHC, IF, FCM | Dilution |
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|---|---|---|---|
| Reactivity | Rat, Chicken, Human | ||
| Source | Mouse Monoclonal Antibody | MW | |
| Storage Buffer | PBS, pH 7.2+50% Glycerol+0.05% BSA+0.01% NaN3 | Storage (From the date of receipt) |
-20°C (avoid freeze-thaw cycles), 2 years |
| IHC |
Experimental Protocol：
Deparaffinization/Rehydration
1. Deparaffinize/hydrate sections:
2. Incubate sections in three washes of xylene for 5 min each.
3. Incubate sections in two washes of 100% ethanol for 10 min each.
4. Incubate sections in two washes of 95% ethanol for 10 min each.
5. Wash sections two times in dH2O for 5 min each.
6.Antigen retrieval: For Citrate: Heat slides in a microwave submersed in 1X citrate unmasking solution until boiling is initiated; continue with 10 min at a sub-boiling temperature (95°-98°C). Cool slides on bench top for 30 min.
Staining
1. Wash sections in dH2O three times for 5 min each.
2. Incubate sections in 3% hydrogen peroxide for 10 min.
3. Wash sections in dH2O two times for 5 min each.
4. Wash sections in wash buffer for 5 min.
5. Block each section with 100–400 µl of blocking solution for 1 hr at room temperature.
6. Remove blocking solution and add 100–400 µl primary antibody diluent in to each section. Incubate overnight at 4°C.
7. Remove antibody solution and wash sections with wash buffer three times for 5 min each.
8. Cover section with 1–3 drops HRPas needed. Incubate in a humidified chamber for 30 min at room temperature.
9. Wash sections three times with wash buffer for 5 min each.
10. Add DAB Chromogen Concentrate to DAB Diluent and mix well before use.
11. Apply 100–400 µl DAB to each section and monitor closely. 1–10 min generally provides an acceptable staining intensity.
12. Immerse slides in dH2O.
13. If desired, counterstain sections with hematoxylin.
14. Wash sections in dH2O two times for 5 min each.
15. Dehydrate sections: Incubate sections in 95% ethanol two times for 10 sec each; Repeat in 100% ethanol, incubating sections two times for 10 sec each; Repeat in xylene, incubating sections two times for 10 sec each.
16. Mount sections with coverslips and mounting medium.
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| IF |
Experimental Protocol:
Sample Preparation
1. Adherent Cells: Place a clean, sterile coverslip in a culture dish. Once the cells grow to near confluence as a monolayer, remove the coverslip for further use.
2. Suspension Cells: Seed the cells onto a clean, sterile slide coated with poly-L-lysine.
3. Frozen Sections: Allow the slide to thaw at room temperature. Wash it with pure water or PBS for 2 times, 3 minutes each time.
4. Paraffin Sections: Deparaffinization and rehydration. Wash the slide with pure water or PBS for 3 times, 3 minutes each time. Then perform antigen retrieval.
Fixation
1. Fix the cell coverslips/spots or tissue sections at room temperature using a fixative such as 4% paraformaldehyde (4% PFA) for 10-15 minutes.
2. Wash the sample with PBS for 3 times, 3 minutes each time.
Permeabilization
1.Add a detergent such as 0.1–0.3% Triton X-100 to the sample and incubate at room temperature for 10–20 minutes.
(Note: This step is only required for intracellular antigens. For antigens expressed on the cell membrane, this step is unnecessary.)
Wash the sample with PBS for 3 times, 3 minutes each time.
Blocking
Add blocking solution and incubate at room temperature for at least 1 hour. (Common blocking solutions include: serum from the same source as the secondary antibody, BSA, or goat serum.)
Note: Ensure the sample remains moist during and after the blocking step to prevent drying, which can lead to high background.
Immunofluorescence Staining (Day 1)
1. Remove the blocking solution and add the diluted primary antibody.
2. Incubate the sample in a humidified chamber at 4°C overnight.
Immunofluorescence Staining (Day 2)
1. Remove the primary antibody and wash with PBST for 3 times, 5 minutes each time.
2. Add the diluted fluorescent secondary antibody and incubate in the dark at 4°C for 1–2 hours.
3. Remove the secondary antibody and wash with PBST for 3 times, 5 minutes each time.
4. Add diluted DAPI and incubate at room temperature in the dark for 5–10 minutes.
5. Wash with PBST for 3 times, 5 minutes each time.
Mounting
1. Mount the sample with an anti-fade mounting medium.
2. Allow the slide to dry at room temperature overnight in the dark.
3. Store the slide in a slide storage box at 4°C, protected from light.
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References
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