Human B-cell receptors specific for Helicobacter pylori CagA, VacA, and NAP

Human B-cell receptors (BCRs) and their secreted antibody counterparts specific for Helicobacter pylori virulence factors—CagA, VacA, and NAP—are central components of the adaptive immune response to gastric infection. CagA (Cytotoxin-associated gene A) is a bacterial oncoprotein that, once injected into host cells, disrupts signaling pathways involved in cell polarity and proliferation, significantly increasing the risk of gastric adenocarcinoma (Hatakeyama, 2004, PMID: 15184342). VacA (Vacuolating cytotoxin A) is a pore-forming toxin that induces large cytoplasmic vacuoles and triggers apoptosis in epithelial cells while also suppressing T-cell activation (Cover & Blanke, 2005, PMID: 15806031). NAP (Neutrophil-activating protein) acts as a potent chemoattractant that recruits and activates neutrophils, driving the chronic inflammation characteristic of H. pylori infection (Satin et al., 2000, PMID: 10859347). These BCRs recognize specific epitopes on these proteins to initiate the production of high-affinity IgG and IgA antibodies intended to neutralize these toxins and facilitate bacterial clearance. Although these antibodies serve as critical diagnostic and prognostic biomarkers for gastric cancer and peptic ulcers, the natural immune response often fails to eradicate the pathogen due to bacterial evasion mechanisms (Parsonnet et al., 1997, PMID: 9322824). Consequently, these receptors are primary targets for vaccine development, where the goal is to elicit a robust, protective B-cell response using recombinant versions of CagA, VacA, and NAP as antigens (Malfertheiner et al., 2008, PMID: 18443611).

Other names

Anti-CagA antibodiesAnti-VacA antibodiesAnti-NAP antibodiesH. pylori-specific B-cell receptorsAnti-Helicobacter pylori immunoglobulins

Binding to and neutralization of H. pylori virulence factors (CagA, VacA, NAP) to inhibit bacterial adhesion, toxin-mediated cell damage, and inflammatory signaling.