3 results about "Hepatitis B Surface Antigens" patented technology

This invention relates to a fusion antigen mRNA molecule, which encodes a protein comprising at least two of the following: hepatitis B surface antigen protein sHBsAg, hepatitis B core antigen protein Core, hepatitis B X antigen protein HBxAg, and hepatitis B preS1 antigen protein PreS1, preferably comprising hepatitis B surface antigen protein sHBsAg, hepatitis B core antigen protein, and hepatitis B PreS1 antigen protein, denoted as sHBsAg-Core-PreS1, and its amino acid sequence is shown in SEQ ID No. 17; the above-mentioned fusion antigen mRNA molecule can be prepared into an mRNA-LNP vaccine composition and used to treat chronic hepatitis B virus infection. The preferred sHBsAg-Core-PreS1 mRNA-LNP of this invention can normally express and present each encoded target antigen in vivo, and achieve cross-presentation, cross-activation and enhanced expression, inducing target antigen-specific humoral and cellular immune responses. It can also effectively overcome immune tolerance in a mouse model of chronic hepatitis B, and has excellent antiviral and immunotherapeutic effects. Compared with existing related therapeutic HBV mRNA-LNP vaccines, it effectively improves the immune tolerance breakthrough threshold, providing a candidate vaccine and a new immunotherapy strategy for the immunotherapy of patients with chronic HBV infection.

The present disclosure relates to antibodies, and antigen binding fragments thereof, that can bind to the antigenic loop region of hepatitis B surface antigen (HBsAg) and can neutralize infection of both hepatitis B virus (HBV) and hepatitis delta virus (HDV). The present disclosure also relates to epitopes to which the antibodies and antigen binding fragments bind, as well as to fusion proteins that comprise the antigen binding fragments, and to nucleic acids that encode and cells that produce such antibodies and antibody fragments. In addition, the present disclosure relates to the use of the antibodies and antibody fragments of the present disclosure in the diagnosis, prophylaxis and treatment of hepatitis B and hepatitis D.

The present invention relates to the field of biomedicine, and in particular to an antigen-antibody complex for enhancing an immune response of a hepatitis B patient, a preparation method therefor, and a use thereof. An antigen-antibody complex formulation prepared from HBsAg and an anti-HBsAg monoclonal antibody is superior to an antigen-antibody complex formulation prepared from a polyclonal antibody in respect of sustained induction of an immune response of a chronic hepatitis B patient. An antigen-antibody complex that induces an immune response of a hepatitis B patient is developed for the first time. In the complex, a hepatitis B surface antigen binds to the anti-HBsAg monoclonal antibody, and the complex composed of the hepatitis B surface antigen and the anti-HBsAg monoclonal antibody which have a certain mass ratio can induce the immune response of the chronic hepatitis B patient, and can also prevent and / or treat chronic hepatitis B.