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Single-stranded RNA adjuvant enhances the efficacy of 10-valent human papilloma virus-like particle vaccine. | LitMetric

AI Article Synopsis

  • - New research focuses on using adjuvants to improve vaccine effectiveness, with aluminum hydroxide (alum) being the most common but mainly triggering a weaker Th1 immune response.
  • - A novel single-stranded ribose nucleic acid (ssRNA) adjuvant was developed to better stimulate the Th1 response, and tests were conducted with a 10-valent HPV-like particle (VLP) vaccine using both ssRNA and alum.
  • - Results showed that the combined ssRNA and alum formulation significantly enhanced the immune response, improving antibody levels and T cell activation, while also inducing robust memory responses, indicating potential for boosting vaccine efficacy.

Article Abstract

Following the development of various types of vaccines, the use of adjuvants to boost vaccine efficacy has become a focus of research. Aluminum hydroxide (alum), the most commonly used adjuvant, induces a certain immune response and ensures safety in human trials. However, alum mainly induces only a Th2 response; its Th1 response is weak. Thus, we previously developed a single-stranded ribose nucleic acid (ssRNA) adjuvant that induces a Th1 response through toll-like receptors. Here, we explored whether 10-valent human papilloma virus (HPV)-like particle (VLP) vaccine formulated with ssRNA adjuvant and alum helped to enhance immune response and maintained memory response. The mice were immunized intramuscularly twice at 2 week intervals and were inoculated 4 days after the second boost (after about 1 year). The antibody response and T cell activation were measured by Elispot, ELISA using harvested serum and splenocytes. The 10-valent HPV VLP vaccine formulated with ssRNA adjuvant and alum increased the antigen-specific immune response more than alum used alone. It increased each type-specific IgG1/IgG2a titer, and antigen-specific IFN-γ cells. Furthermore, the ssRNA adjuvant with alum induced memory response. In memory response, each type-specific IgG1/IgG2c, IFN-γ, and IL-6 cytokine, and neutralizing antibodies were increased by the ssRNA adjuvant with alum. Overall, the ssRNA adjuvant with alum induced memory responses and balanced Th1/Th2 responses. The ssRNA adjuvant and alum may help to enhance prophylactic vaccine efficacy.

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Source
http://dx.doi.org/10.1111/1348-0421.13024DOI Listing

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