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生物学的記述
| Specificity | C5b-9 + C5b-8 Antibody [P24G22] detects endogenous levels of total C5b-9 and C5b-8 protein. |
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| Background | C5b-8 and C5b-9 are critical intermediates and the terminal effector of the complement terminal pathway, assembling sequentially on target membranes to form the membrane attack complex (MAC) responsible for innate immune lysis. C5b-8 consists of C5b bound to C6, C7, and heterotrimeric C8 (with α, β, and γ subunits containing MACPF/perforin, thrombospondin type-1, EGF-like, and LDL receptor domains), where the amphiphilic α-to-β hairpin transition in C8α/β enables membrane insertion and catalyzes C9 recruitment and polymerization into a toroidal pore of 16–18 monomers (approximately 100–200 Å in diameter) with a hydrophilic inner channel, β-sheet stem, and outer β-hairpin wall. C5b-8 binds the globular form of C9, inducing allosteric arcuate elongation and rapid oligomerization via lateral contacts that breach the phospholipid bilayer, resulting in uncontrolled Ca²⁺/Na⁺ influx, colloid osmotic swelling, and cell lysis vital for pathogen clearance. Sublytic MAC pores can activate survival pathways (such as Bad phosphorylation and ERK/NF-κB signaling), promoting inflammation, leukocyte recruitment, and prothrombotic effects. Host cells are protected by CD59, which binds C8α’s β-hairpin, forming steric β-sheets that deflect C9 trajectories and halt MAC assembly. Dysregulation of C5b-9 contributes to diseases such as paroxysmal nocturnal hemoglobinuria (PNH), resulting from CD55/CD59 loss and erythrocyte lysis, atypical hemolytic uremic syndrome (aHUS) due to complement regulator deficiencies, and plays a role in transplant rejection and ischemia-reperfusion injury through bystander endothelial damage. |
使用情報
| Application | IHC, IF, FCM, ELISA | Dilution |
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| Reactivity | Human, Baboon, Monkey, Pig, Horse | ||||
| 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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