title: Expression of hepatitis B surface antigen in unselected cell culture transfected with recircularized HBV DNA.
abstract: Hepatitis B virus (HBV) DNA was isolated from the recombinant plasmid pA01 -HBV and recircularized . Immediately after introduction of this DNA into mouse fibroblasts (NIH 3T3) we observed increasing release of hepatitis B surface antigen (HBsAg) into the culture medium. Later production of HBsAg declined to a lower but constant level. No dominant selective marker and foreign promoter were necessary in this system, which therefore can be used for the study of regulation of HBsAg expression.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004270:DNA, Circular / Q000235:genetics*; D004274:DNA, Recombinant / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics*; D006514:Hepatitis B Surface Antigens / Q000235:genetics*; D006515:Hepatitis B virus / Q000235:genetics / Q000276:immunology*; D051379:Mice; D010957:Plasmids; D014162:Transfection
chemical_list: D004270:DNA, Circular; D004274:DNA, Recombinant; D004279:DNA, Viral; D006514:Hepatitis B Surface Antigens; D004262:DNA Restriction Enzymes