Shigella antigenic epitopes

Shigella antigenic epitopes are specific molecular structures on the surface of Shigella species, including S. flexneri, S. sonnei, S. dysenteriae, and S. boydii, that trigger host immune recognition. The primary target for protective immunity is the O-antigen (O-polysaccharide) of the lipopolysaccharide (LPS), which is highly variable and defines the different serotypes of the bacteria (Mani et al., 2016, The Lancet Infectious Diseases). In addition to the O-antigen, conserved protein epitopes such as the invasion plasmid antigens (IpaB, IpaC, and IpaD) play a critical role in the Type III Secretion System (T3SS), facilitating the invasion of the colonic epithelium (Picking et al., 2004, Infection and Immunity). These epitopes are the central focus of vaccine development, including bioconjugates, synthetic carbohydrate vaccines, and live-attenuated strains, aimed at preventing shigellosis. Because Shigella is a major cause of global diarrheal mortality, particularly in children in low-income settings, these epitopes are high-priority targets for inducing long-lasting mucosal and systemic immunity (Cohen et al., 2022, Vaccine). Therapeutic strategies also include the development of monoclonal antibodies that target these epitopes to provide passive immunization or treat acute infections.

Other names

Shigella surface antigensShigella O-antigensShigella invasion plasmid antigensShigella lipopolysaccharideIpa proteinsO-polysaccharide

Induction of protective humoral and cellular immune responses, primarily through the production of neutralizing antibodies that prevent bacterial attachment and invasion of the intestinal epithelium.