Overview
Anti-DNase antibodies are immunoglobulins that bind specifically to deoxyribonuclease (DNase) enzymes, primarily DNase B secreted by group A streptococci. These antibodies serve as biomarkers in clinical diagnostics, particularly for post-streptococcal complications like rheumatic fever and glomerulonephritis. Their detection aids in distinguishing recent streptococcal infections from historical exposures. In research, anti-DNase reagents are utilized to study DNase function in apoptosis (e.g., DNase I in DNA fragmentation) and autoimmune conditions like systemic lupus erythematosus (SLE), where DNase deficiencies correlate with disease progression. Commercial anti-DNase products include polyclonal and monoclonal antibodies, often conjugated with fluorescent or enzymatic labels for assays.
Physical and Chemical Properties
Anti-DNase antibodies are typically IgG or IgM isotypes with molecular weights ranging from 150 kDa (IgG) to 900 kDa (IgM pentamer). They exhibit high affinity for DNase epitopes, with dissociation constants (Kd) in the nanomolar range. Liquid formulations often contain stabilizing agents like bovine serum albumin (BSA) or glycerol in phosphate-buffered saline (PBS). These antibodies are sensitive to denaturation by extreme pH (<4 or >10) or temperatures above 60°C. Storage at -20°C in aliquots is recommended to preserve activity. Lyophilized powders may require reconstitution with sterile water or specific buffers provided by manufacturers.
Main Applications
In clinical diagnostics, anti-DNase B titers are measured via ELISA or neutralization assays to confirm recent streptococcal infections, complementing ASO (anti-streptolysin O) testing. Elevated levels (>480 IU/mL in adults) suggest acute infection. This is critical for diagnosing rheumatic fever in patients with negative ASO results. Research applications include studying DNase roles in chromatin remodeling, neutrophil extracellular trap (NET) degradation, and SLE pathogenesis. Anti-DNase antibodies are also used in immunohistochemistry to localize DNase expression in tissues. In biotechnology, they serve as inhibitory controls in DNase activity assays for quality control of recombinant enzymes.
Safety and Storage
Anti-DNase antibodies derived from human/animal sera require biosafety level 2 (BSL-2) handling due to potential pathogen exposure risks. Use personal protective equipment (PPE) and work in ventilated hoods when handling concentrated forms. Avoid inhalation or skin contact with aerosolized particles. For storage, maintain aliquots at -20°C; avoid frost-free freezers to prevent temperature fluctuations. Lyophilized antibodies are stable at 4°C for short-term storage but require desiccants to prevent moisture absorption. Always centrifuge liquid vials before opening to consolidate contents and minimize aggregation.
B2B Procurement Guide
When procuring anti-DNase antibodies, prioritize suppliers with ISO 9001 or ISO 13485 certification for diagnostic-grade products. Key specifications include reactivity (human, murine DNase), cross-reactivity data, and validation in intended applications (e.g., ELISA, Western blot). Request batch-specific certificates of analysis (CoA) detailing purity, endotoxin levels (<1 EU/μg), and functional testing results. For bulk orders, negotiate volume discounts and confirm lead times, as some antibodies are produced on-demand. Consider downstream conjugation needs—pre-conjugated antibodies (e.g., HRP, FITC) may save time but cost 20-30% more. For international shipments, ensure cold chain logistics with temperature monitoring to prevent degradation.
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