Lipid Nanoparticle–Delivered Circular RNA Vaccine Induces Potent Immune Responses
A New Weapon to Awaken Immunity
circRNA possesses a closed-loop structure that confers resistance to nucleases, whereas conventional vaccines are rapidly degraded, resulting in diminished efficacy. Therefore, researchers sought a vaccine with prolonged stability.
Convergence of Lipid Nanoparticles and circRNA
The team encapsulated circRNA within lipid nanoparticles and administered the formulation to mice. This resulted in robust maturation of dendritic cells and strong activation of CD4⁺ and CD8⁺ T cells. Comparable immune activation was observed in human peripheral blood mononuclear cells.
Steps Toward Therapeutic Potential
The platform enables the incorporation of tumor-specific antigens to generate personalized vaccines. Advancement to clinical trials could provide patients with novel therapeutic options.
Future Significance and Outlook
Commercialization of circRNA-based vaccines could fundamentally shift the cancer treatment paradigm and may extend to prophylactic applications.
Circle RNA (circRNA) is a closed-loop nucleic acid resistant to exonuclease degradation. Their enhanced stability and potential for efficient protein expression through circRNA modification render them promising novel therapeutic agents for cancer treatment. In this study, we systematically investigated the antitumor and anti-inflammatory activities of circRNA vaccines in mice, as well as their effects on activating antigen-specific immune responses, through a meta-analysis. Subsequently, we further validated the immune-activating effects of circRNA using monocytes and T cells isolated from human peripheral blood mononuclear cells. We found that circRNA induces the activation and maturation of dendritic cells, as well as the responses of CD4 + and CD8 + T cells. These findings demonstrate the potential of circRNA to exert significant effects in therapeutic cancer vaccines.
This study addresses the limitation of conventional vaccines that are rapidly degraded and fail to elicit sufficient immunity. It paves the way for safer and more effective cancer prevention and therapy.