C3 plays a central role in the activation of the complement system. Its processing by C3 convertase is the central reaction in both classical and alternative complement pathways. After activation C3b can bind covalently, via its reactive thioester, to cell surface carbohydrates or immune aggregates. Derived from proteolytic degradation of complement C3, C3a anaphylatoxin is a mediator of local inflammatory process. In chronic inflammation, acts as a chemoattractant for neutrophils. It induces the contraction of smooth muscle, increases vascular permeability and causes histamine release from mast cells and basophilic leukocytes. A rare defect of the complement classical pathway. Patients develop recurrent, severe, pyogenic infections because of ineffective opsonization of pathogens. Some patients may also develop autoimmune disorders, such as arthralgia and vasculitic rashes, lupus-like syndrome and membranoproliferative glomerulonephritis.
Background References
1. Hao W et al. Gut dysbiosis induces the development of depression-like behavior through abnormal synapse pruning in microglia-mediated by complement C3. Microbiome. 2024 Feb
2. Xu L et al. Inhibition of complement C3 signaling ameliorates locomotor and visual dysfunction in autoimmune inflammatory diseases. Mol Ther. 2023 Sep
Western blot analysis of Complement C3 on different lysates with Rabbit anti-Complement C3 antibody (HA723984) at 1/2,000 dilution.
Lane 1: Mouse liver tissue lysate Lane 2: Mouse spleen tissue lysate Lane 3: Rat liver tissue lysate Lane 4: Rat spleen tissue lysate
Lysates/proteins at 20 µg/Lane.
Predicted band size: 186 kDa Observed band size: 43-186 kDa
Exposure time: 10 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA723984) at 1/2,000 dilution was used in primary antibody dilution (K1803) at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
Application: IHC-Fr
Species: Mouse
Site: liver
Sample: Frozen section
Antibody concentration: 1/500
Antigen retrieval: Not required
Application: IHC-Fr
Species: Rat
Site: liver
Sample: Frozen section
Antibody concentration: 1/500
Antigen retrieval: Not required
Immunohistochemical analysis of paraffin-embedded mouse liver tissue with Rabbit anti-Complement C3 antibody (HA723984) at 1/1,000 dilution.
The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0) for 20 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (HA723984) at 1/1,000 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
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