A substituted tetrahydro-tetrazolo-pyrimidine is a specific and novel inhibitor of hepatitis B virus surface antigen secretion.
The high levels of hepatitis B virus (HBV) surface antigen (HBsAg)-bearing subviral particles in the serum of chronically infected individuals are thought to play a role in suppressing the HBV-specific immune response. Current therapeutics are not directed at reducing this viral antigenemia; thus, our group has focused on identifying inhibitors of HBsAg secretion. By using the HBV-expressing cell line HepG2.2.15, high-throughput screening of an 80,288-compound synthetic small-molecule library identified HBF-0259, an aromatically substituted tetrahydro-tetrazolo-(1, 5-a)-pyrimidine. Following resynthesis, HBF-0259 had a 50% effective concentration of approximately 1.5 microM in a secondary, HBV-expressing cell line, with a concentration that exhibited 50% cytotoxicity of >50 microM. The equilibrium concentration of HBF-0259 in aqueous solution at physiological pH was 15 to 16 microM; the selective index was thus >9. As intended by our screening paradigm, HBF-0259 is a selective, potent inhibitor of secretion of both subviral and DNA-containing viral particles, while the secretion of alpha-1-acid glycoprotein and alpha-1-antitrypsin was unaffected. The HBV e antigen, which is not a constituent of HBV particles, was also unaffected, suggesting that the secretion of particles bearing HBV structural glycoproteins is targeted directly. Inhibitory activity was also confirmed by transfection of HBsAg, indicating that the action of the compound is independent of those of other viral proteins. HBF-0259 had no effect on HBV DNA synthesis, demonstrating that inhibition is independent of viral genomic replication. Finally, HBF-0259 had little or no effect on the cell-to-cell spread of two unrelated viruses, suggesting that it is a specific inhibitor of secretion of HBsAg. Possible mechanisms of action and the implications for its development are discussed.
Dougherty
Anne Marie
AM
Institute for Hepatitis and Virus Research, Hepatitis B Foundation, 3805 Old Easton Road, Doylestown, PA 18902, USA.
Guo
Haitao
H
Westby
Gael
G
Liu
Yuanjie
Y
Simsek
Ender
E
Guo
Ju-Tao
JT
Mehta
Anand
A
Norton
Pamela
P
Gu
Baohua
B
Block
Timothy
T
Cuconati
Andrea
A
D015139:Blotting, Southern; D015153:Blotting, Western; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004279:DNA, Viral / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D004797:Enzyme-Linked Immunosorbent Assay; D006514:Hepatitis B Surface Antigens / Q000235:genetics / Q000378:metabolism*; D006515:Hepatitis B virus / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D015394:Molecular Structure; D011743:Pyrimidines / Q000737:chemistry / Q000494:pharmacology*; D013777:Tetrazoles / Q000737:chemistry / Q000494:pharmacology*; D014162:Transfection; D014759:Viral Envelope Proteins / Q000235:genetics / Q000378:metabolism; D014779:Virus Replication / Q000187:drug effects
D004279:DNA, Viral; C528232:HBF 0259; D006514:Hepatitis B Surface Antigens; D011743:Pyrimidines; D013777:Tetrazoles; D014759:Viral Envelope Proteins; C030986:pyrimidine