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Caspase-3 (CASP3) Antibody, Proteins & Activity Assays
Comprehensive Tools for Detecting Caspase-3 Activation and Apoptosis
1. Overview of Caspase-3 Products
Caspase-3 is one of the most widely used apoptosis biomarkers, particularly in studies involving cancer, neurodegeneration, immunology, and drug-induced cytotoxicity. Accurate detection of caspase-3 requires distinguishing between its inactive, precursor, total, and active (cleaved) forms.
Biorbyt provides a complete range of caspase-3 research tools, including:
- Active (cleaved) caspase-3 monoclonal antibodies
- Total caspase-3 antibodies
- Procaspase-3 (precursor) antibodies
- Caspase-3 (Asp175) cleavage-specific antibodies
- Caspase-3 activity assay kits
- Recombinant caspase-3 proteins
These reagents enable precise mapping of apoptosis progression, from early expression to final execution.
2. What is Caspase-3?
Caspase-3 (CASP3) is a central executioner protease in apoptosis, functioning at the final stage of the caspase cascade where cellular dismantling becomes irreversible. Rather than existing as a single static protein, caspase-3 transitions through multiple forms during the apoptotic process, each reflecting a distinct stage of cell fate commitment.
In healthy cells, caspase-3 is predominantly present as procaspase-3, an inactive precursor (~32 kDa) that remains cytosolic and does not exhibit proteolytic activity. At this stage, cells are fully viable, and the presence of procaspase-3 represents a potential for apoptosis, rather than ongoing cell death.
Upon apoptotic stimulation—such as DNA damage, oxidative stress, or death receptor signaling—the upstream caspase cascade is initiated. Signals from the intrinsic pathway (mitochondrial pathway, mediated by cytochrome c and caspase-9) or the extrinsic pathway (death receptor pathway, mediated by caspase-8) converge to activate caspase-3 through proteolytic cleavage.
This critical cleavage event converts procaspase-3 into its active form, generating the characteristic cleaved caspase-3 fragments (p17 and p12 subunits). At this stage, caspase-3 becomes enzymatically active and begins executing apoptosis by cleaving key substrates such as PARP and ICAD, leading to DNA fragmentation, chromatin condensation, and cytoskeletal breakdown.
A defining hallmark of this activation process is cleavage at a specific site, known as Asp175. Detection of cleaved caspase-3 (Asp175) provides a highly specific readout of caspase activation, distinguishing true apoptotic execution from simple protein expression or early signaling events.
As apoptosis progresses, the cellular balance shifts from procaspase-3 and total caspase-3 toward accumulation of cleaved caspase-3, marking the transition from reversible cellular stress to irreversible cell death.
3. How to Choose the Right Caspase-3 Antibody
Because caspase-3 exists in multiple forms throughout apoptosis, selecting the right antibody depends on what stage of the process you want to measure.
- Detect procaspase-3 to evaluate baseline expression and early-stage apoptosis potential.
- Use total caspase-3 antibodies to compare overall protein levels across samples.
- Choose cleaved caspase-3 antibodies to confirm apoptosis execution.
- Use cleaved-Asp175 antibodies for highly specific detection of activation events.
Key Takeaway: The right antibody allows you to accurately track apoptosis from initiation to execution.
4. Recommended Caspase-3 Antibodies
Biorbyt offers a comprehensive selection of Caspase-3 antibodies targeting different forms, including procaspase-3, total caspase-3, and cleaved caspase-3 (Asp175). Many of these antibodies are citation-supported and validated across key applications, enabling reliable and reproducible apoptosis research.
SKU | Product Name | Key Advantage | Applications | Size | Price |
|---|---|---|---|---|---|
Best for apoptosis detection (Citation supported). Specific for active (cleaved) caspase-3, ideal apoptosis marker | WB, IHC | 50 μl | $260 | ||
High consistency & sensitivity, suitable for IF and multi-application workflows | IF, IHC, WB | 25 μl | $180 | ||
Citation supported. Detects p17 subunit, suitable for WB and ELISA quantification | WB, ELISA | 50 μl | $250 | ||
Citation supported. Specific for procaspase-3, ideal for early-stage apoptosis studies | WB, ELISA | 50 μl | $250 | ||
Citation supported. Highly specific cleavage-site detection for precise apoptosis analysis | WB, IHC | 25 μg | $110 |
5. Caspase-3 Activity Detection & Quantification
In apoptosis-related studies, detecting protein presence alone is often insufficient. Researchers increasingly require quantitative measurement of caspase-3 enzymatic activity, which directly reflects functional apoptosis.
Research Context:
In studies such as cancer drug screening, cytotoxicity assays, and apoptosis pathway validation, it is critical to distinguish between Caspase-3 expression vs. Caspase-3 enzymatic activation. Activity assays based on DEVD substrates provide a direct and quantitative readout of protease function.
Kit
Caspase-3 Activity Colorimetric Microplate Assay Kit (orb707372)
- Detection range: 0.01–5 μmol/ml
- Suitable for cell lysates and tissue extracts
- Colorimetric format for easy quantification
- Ideal for: Functional apoptosis analysis and drug response studies
6. Recombinant Caspase-3 Protein for Functional Studies
To investigate apoptosis mechanisms at a biochemical level, purified caspase-3 protein is often required.
Research Context:
Used extensively in enzyme kinetics and substrate studies, caspase inhibitor screening, and pathway reconstruction workflows.
Pro
Human Caspase-3 Protein (orb603954)
- Purity: >90% (SDS-PAGE)
- Expression region: 29–175aa
- Suitable for enzymatic assays and validation
7. Why Choose Biorbyt Caspase-3 Products?
Choosing the right reagent is critical for generating reliable apoptosis data. Biorbyt caspase-3 products are designed to provide accuracy, reproducibility, and experimental confidence.
- Coverage of all caspase-3 forms across apoptosis stages
- Citation-supported antibodies for validated research
- Broad species reactivity (Human, Mouse, Rat)
- High sensitivity and low background for apoptosis detection
- Reliable quality with expert technical support
8. FAQ – Caspase-3 Research
What is cleaved caspase-3?
Cleaved caspase-3 is the active form of caspase-3, generated during apoptosis and widely used as a reliable apoptosis marker.
What is the difference between procaspase-3 and cleaved caspase-3?
Procaspase-3 is inactive, while cleaved caspase-3 is enzymatically active and drives apoptosis.
Why is Asp175 important?
Asp175 is a specific cleavage site, making it a highly accurate marker for caspase-3 activation.
How do I measure caspase-3 activity?
Use a caspase-3 activity assay kit based on DEVD substrates to quantify enzymatic activity.
Which caspase-3 antibody should I choose?
- Study expression: Total caspase-3 antibody
- Study activation: Cleaved caspase-3 antibody
- Study early stage: Procaspase-3 antibody