Helicobacter pylori surface components and secreted enzymes (H. pylori virulence factors)

Helicobacter pylori surface components and secreted enzymes constitute a complex array of virulence factors that enable the bacterium to colonize the human gastric mucosa and survive the acidic environment of the stomach [1]. A central component is the enzyme urease, which catalyzes the hydrolysis of urea into ammonia and carbon dioxide, effectively neutralizing local gastric acid to create a habitable niche [1, 2]. Surface-exposed adhesins, such as Blood group antigen-binding adhesin (BabA) and Sialic acid-binding adhesin (SabA), facilitate persistent attachment to gastric epithelial cells [3]. Secreted factors like Vacuolating cytotoxin A (VacA) and the Cytotoxin-associated gene A (CagA) protein, which is delivered via a type IV secretion system, disrupt host cell signaling, induce apoptosis, and promote a robust inflammatory response [2, 4]. These components are the primary targets for current eradication therapies, which typically involve a combination of proton pump inhibitors and multiple antibiotics like clarithromycin and amoxicillin [5]. Furthermore, these proteins are the focus of vaccine development efforts aimed at inducing protective immunity against H. pylori-associated diseases, including chronic gastritis, peptic ulcers, and gastric cancer [4, 6]. Sources: [1] StatPearls, Helicobacter Pylori (https://www.ncbi.nlm.nih.gov/books/NBK544281/); [2] UniProt, Vacuolating cytotoxin A (P55981) and CagA (P12914); [3] PubMed, PMID: 12472335; [4] Nature Reviews Microbiology, https://www.nature.com/articles/nrmicro.2017.117; [5] NIH/NIDDK, https://www.niddk.nih.gov/health-information/digestive-diseases/helicobacter-pylori-hpylori/treatment; [6] PubMed, PMID: 31401145.

Other names

H. pylori antigensH. pylori extracellular proteinsH. pylori pathogenic factors

Antibiotics inhibit the synthesis of these surface and secreted proteins by disrupting bacterial cell wall assembly, protein translation, or DNA replication. Bismuth salts and certain inhibitors directly interfere with urease activity and bacterial adhesion to the gastric mucosa.