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Bordetella pertussis protein antigen (There is no common single abbreviation for the group as a whole; individual antigens such as Pertussis toxin (PT), Filamentous hemagglutinin (FHA), Pertactin (PRN), and Fimbriae (Fim) have established abbreviations[3][7].)

Target: There is no common single abbreviation for the group as a whole; individual antigens such as Pertussis toxin (PT), Filamentous hemagglutinin (FHA), Pertactin (PRN), and Fimbriae (Fim) have established abbreviations[3][7].
Molecular classification: Toxin (Pertussis toxin/PT), Adhesin (Filamentous hemagglutinin/FHA, Pertactin/PRN, Fimbriae/Fim), Outer membrane protein (PRN, Fim, OMPs)

Overview

Bordetella pertussis protein antigens refer collectively to key surface and secreted virulence proteins—primarily Pertussis toxin (PT), Filamentous hemagglutinin (FHA), Pertactin (PRN), and Fimbriae (Fim)—that are essential for bacterial adherence, immune modulation, and pathogenesis. These proteins are the main protective antigens included in acellular pertussis vaccines currently in use. PT is an A-B exotoxin that modifies host G proteins via ADP-ribosylation, disrupting cell signaling. FHA, PRN, and Fim function mainly as adhesins, enabling bacterial attachment to the respiratory mucosa. High-titer antibodies to these antigens are associated with protection against whooping cough, though antigenic variation (especially in PRN) can reduce vaccine impact[2][3][4][5][7].

Other names: Pertussis antigensB. pertussis vaccine antigensAcellular pertussis vaccine antigensPT, FHA, PRN, Fim

Mechanism of action

Vaccines/antibodies: Neutralize bacterial toxins (PT), block adhesion (FHA, PRN, Fim). PT: ADP-ribosylates host G proteins, leading to dysregulation of cAMP signaling[4][5].

Biological functions

Host cell adhesion (FHA, PRN, Fim)Immune modulation/evasion (PT)Induction of immune response (all antigens as vaccine targets)

Disease associations

Infection (whooping cough/pertussis)

Safety considerations

Antigen variation/mutation (especially in PRN and PT genes, leading to reduced vaccine effectiveness)[2][7]Some strains lose PRN expression, which may help escape immunity[2][7].No direct drug-targeting; vaccine reactogenicity is minimal with acellular antigens compared to whole-cell antigens[6].

Interacting drugs

None directly; however, immune globulins or vaccine-induced antibodies specifically target these antigens[6][7].

Biomarkers

Anti-PT, anti-FHA, anti-PRN, and anti-Fim antibody titers are used to assess immunological response and vaccine efficacy[2][7].Presence/absence of PRN protein in clinical isolates can be a biomarker for vaccine strain divergence[2].

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