Anti-Caspase 4/Casp4 Antibody Picoband®

Overview

This antibody is intended for detection of Casp4 (Peroxisomal multifunctional enzyme type 2) in biological samples using common immunoassay formats. It is typically selected based on target identity, species reactivity, clonality/clone information, and detection modality.

Vendor notes: Boster Bio Anti-Caspase 4/Casp4 Antibody Picoband® catalog # A02941-2. Tested in ELISA, IF, ICC, WB applications. This antibody reacts with Human, Mouse, Rat. The brand Picoband indicates this is a premium antibody that guarantees superior quality, high affinity, and strong signals with minimal background in Western blot applications. Only our best-performing antibodies are designated as Picoband, ensuring unmatched performance.

Key elements and design rationale

• Antibody format: Rabbit Polyclonal Rabbit IgG
• Immunogen / epitope context: E. coli-derived mouse Caspase 4 recombinant protein (Position: E108-T195). (reported region: E108-T195).
• Molecular weight context: reported MW: 43 kDa; calculated MW: 79686 MW
• Reactivity: Human,Mouse,Rat
• Applications: ELISA, IF, ICC, WB

As a polyclonal antibody, the reagent recognizes multiple epitopes on the target, which can improve detection robustness but may increase sensitivity to sample-dependent epitope changes.

Biological background

Peroxisomal multifunctional enzyme type 2; caspase 4, apoptosis-related cysteine peptidase. Caspase 4 is an enzyme that proteolytically cleaves other proteins at an aspartic acid residue, and belongs to a family of cysteine proteases called caspases. The Caspase 4 gene is mapped to a P1 clone containing the ICE gene, which is located at chromosome 11q22.2-q22.3. It contains 8 coding exons. The function of caspase 4 is not fully known, but it is believed to be an inflammatory caspase, along with caspase 1, caspase 5 (and the murine homolog caspase 11), with a role in the immune system. Functional note: Proinflammatory caspase (PubMed:8702803, PubMed:9038361, PubMed:25119034). Essential effector of NLRP3 inflammasome- dependent CASP1 activation and IL1B and IL18 secretion in response to non-canonical activators, such as UVB radiation, cholera enterotoxin subunit B and cytosolic LPS, as well as infection with Gram-negative bacteria (PubMed:22002608). Independently of NLRP3 inflammasome and CASP1, promotes pyroptosis, through GSDMD cleavage and activation, and IL1A, IL18 and HMGB1 release in response to non-canonical inflammasome activators (PubMed:22002608, PubMed:26320999, PubMed:26375003). Plays a crucial role in the restriction of Salmonella typhimurium replication in colonic epithelial cells during infection. In later stages of the infection (>3 days post infection), LPS from cytosolic Salmonella triggers CASP4 activation, which ultimately results in the pyroptosis of the infected cells and their extrusion into the gut lumen, as well as in IL18 secretion. Pyroptosis limits bacterial replication, while cytokine secretion promotes the recruitment and activation of immune cells and triggers mucosal inflammation (PubMed:25121752). Involved in LPS- induced IL6 secretion; this activity may not require caspase enzymatic activity (By similarity). Involved in cell death induced by endoplasmic reticulum stress (By similarity). Activated by binding to LPS without the need of an upstream sensor (PubMed:25119034). Does not ly process IL1B (PubMed:8702803, PubMed:9038361). During non-canonical inflammasome activation, cuts MB21D1 and may play a role in the regulation of antiviral innate immune activation (PubMed:28314590). Reported localization: Cytoplasm, cytosol. Expression/tissue context: Widely expressed, including in thymus, lung and spleen (at protein level). Very low levels, if any, in the brain.

Research relevance and current trends

• Apoptosis: Researchers commonly examine how Casp4 (Peroxisomal multifunctional enzyme type 2) relates to this theme using model systems and orthogonal readouts.
• Apoptotic Markers: Researchers commonly examine how Casp4 (Peroxisomal multifunctional enzyme type 2) relates to this theme using model systems and orthogonal readouts.
• Cancer: Researchers commonly examine how Casp4 (Peroxisomal multifunctional enzyme type 2) relates to this theme using model systems and orthogonal readouts.

Common research applications

• Western blotting: compare relative Casp4 (Peroxisomal multifunctional enzyme type 2) levels across conditions; band patterns may reflect isoforms and processing.
• IF/ICC: evaluate subcellular localization and co-localization patterns; signal can depend on fixation/permeabilization and epitope accessibility.
• ELISA-compatible use: when applicable, interpret signal as relative abundance across sample sets with consistent handling and dilution strategy.

Notes for experimental interpretation

• Specificity notes: No cross reactivity with other proteins.
• Cross-reactivity: No cross-reactivity with other proteins.
• Isoforms and PTMs: Apparent size and signal patterns can differ across splice isoforms, proteolytic processing, and post-translational modifications.
• Controls: Include an isotype control (as relevant), no-primary control for imaging, and orthogonal validation such as KD/KO samples when available.

Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.