LCB3 Antibody

Introduction to LC3B Antibody

LC3B (Microtubule-associated protein 1A/1B-light chain 3B) is a ubiquitin-like protein central to autophagy, a cellular recycling process critical for maintaining homeostasis. LC3B antibodies are indispensable tools for detecting LC3B-I (cytosolic form) and LC3B-II (lipidated, autophagosome-bound form), enabling researchers to study autophagic flux and its dysregulation in diseases such as cancer, neurodegeneration, and metabolic disorders . These antibodies are validated across applications including Western blot (WB), immunofluorescence (IF), immunohistochemistry (IHC), and flow cytometry .

Applications in Autophagy Research

LC3B antibodies are pivotal for:

• Autophagosome Tracking: LC3B-II accumulation (e.g., under chloroquine treatment) indicates blocked autophagosome-lysosome fusion .

• Disease Mechanisms: Dysregulated LC3B correlates with tumor progression , neurodegenerative aggregates , and HCV infection .

• Structural Studies: LC3B interacts with autophagy receptors (e.g., p62/SQSTM1) and ribosomes .

Key Protocols:

Validation and Specificity

LC3B antibodies are rigorously validated using knockout (KO) cell lines (e.g., HeLa LC3B KO) . For example:

• CAB7198: Detects 14–16 kDa bands in chloroquine-treated 293T cells, absent in KO lysates .

• GTX127375: Binds LC3B in autophagosomes of HepG2 cells under thapsigargin stress .

• ab48394: Distinguishes LC3B-II upregulation in wild-type vs. KO HeLa cells .

Cross-reactivity: Most antibodies (e.g., MAB85581, ab51520) show no cross-reactivity with LC3A or LC3C due to isoform-specific epitopes .

Non-Canonical Roles of LC3B

• RNA Binding: LC3B binds AAUAAA motifs in mRNA 3'UTRs, promoting CCR4-NOT-mediated degradation (e.g., PRMT1 mRNA) .

• Oxidative Stress: ROS-induced LC3B enhances apoptosis and reduces tumor growth independent of autophagy .

Disease Insights

• Cancer: LC3B knockdown reduces annexin V+ apoptosis in ovarian cancer cells .

• Neurodegeneration: LC3B co-localizes with α-synuclein aggregates in Parkinson’s models .

Technical Considerations

• Storage: Most antibodies require -20°C storage in glycerol-containing buffers .

• Buffers: Avoid freeze-thaw cycles; use PBS with 0.09% sodium azide .

• Controls: Include chloroquine-treated and KO cell lysates to validate autophagic flux .