Western blot analysis of extracts from various cell lines using Complement C3 Antibody (upper) and β-Tubulin (D2N5G) Rabbit mAb #15115 (lower).
Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C. Do not aliquot the antibody.
For western blots, incubate membrane with diluted primary antibody in 5% w/v BSA, 1X TBS, 0.1% Tween® 20 at 4°C with gentle shaking, overnight.
NOTE: Please refer to primary antibody datasheet or product webpage for recommended antibody dilution.
From sample preparation to detection, the reagents you need for your Western Blot are now in one convenient kit: #12957 Western Blotting Application Solutions Kit
NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.
Load 20 µl onto SDS-PAGE gel (10 cm x 10 cm).
NOTE: Volumes are for 10 cm x 10 cm (100 cm2) of membrane; for different sized membranes, adjust volumes accordingly.
* Avoid repeated exposure to skin.
posted June 2005
revised November 2013
Reprobing of an existing membrane is a convenient means to immunoblot for multiple proteins independently when only a limited amount of sample is available. It should be noted that for the best possible results a fresh blot is always recommended. Reprobing can be a valuable method but with each reprobing of a blot there is potential for increased background signal. Additionally, it is recommended that you verify the removal of the first antibody complex prior to reprobing so that signal attributed to binding of the new antibody is not leftover signal from the first immunoblotting experiment. This can be done by re-exposing the blot to ECL reagents and making sure there is no signal prior to adding the next primary antibody.
NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalently purified water.
posted June 2005
revised October 2016
Protocol Id: 10
Complement C3 Antibody recognizes endogenous levels of total C3 protein. The predicted epitope of Complement C3 Antibody is at the C-terminus of the α-subunit of C3 protein.Species Reactivity:
Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Val1527 of human C3 protein. Antibodies are purified by peptide affinity chromatography.
Complement is a collection of soluble proteins secreted in the blood and other body fluids (1). As part of the innate immune system, complement proteins are involved in the clearance of pathogens and damaged cells in a process called opsonization, which results in the coating of a pathogen with antibodies and/or complement proteins to facilitate phagocytosis of debris or foreign pathogens. Complements are activated by a cascade of cleavage reactions, triggered initially by pattern recognition receptor-mediated detection of pathogens/debris. The cascade of cleavage-mediated products activates three distinct effector pathways, including inflammation, phagocytosis, and membrane attack, that represent a coordinated defense of the host organism. Several complement proteins are encoded in the mammalian genome, designated by the capital letter "C" followed by a number, in order by their discovery. Many complement cascades converge on C3, encoded by the C3 gene, by activating C3 convertase. The C3 gene generates a C3 polypeptide protein, composed of an α-subunit and a β-subunit linked by disulfide bonds. Activation of C3 convertase cleaves the C3 α-subunit to generate C3a, which acts as an anaphylatoxin to mediate the local inflammatory response. In addition to C3a, C3 convertase-mediated cleavage of C3 generates C3b. C3b has multiple functions and is a major effector molecule of the complement system. C3b binds to microbial surfaces to enable phagocytosis by phagocytic cells carrying the C3 receptor. C3b can also be further processed by serum proteases to generate other bioactive fragments. Finally, C3b can form complexes with other complement fragments to initiate cleavage of complement family members like C5, which initiates additional innate immune responses. In addition to the innate immune response, several components of the complement system, including C3, have been implicated in brain development, as well as neurodevelopmental and neurodegenerative diseases. The complement system plays a role in microglia-dependent synapse pruning of excess synapses during development, particularly in the visual system (2). Additionally, complement-mediated synaptic pruning may also contribute to neurodegenerative diseases such as Alzheimer’s disease (3,4).
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