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Novel therapeutic approaches to cure chronic HBV infection
Date:4/24/2013

n. In a separate innovative study, the suppression of HBV transcription and replication by small molecules that target the epigenetic control of nuclear cccDNA minichromosome was investigated. The different classes of small molecules studied included: Class I, II and III histone deacetylase inhibitors (HDACi); p300 and PCAF histone acetyltransferases (HAT) inhibitors; hSirt1 activators; JMJD3 histone demethylase inhibitors.

The combined inhibition of p300 and PCAF HATs resulted in an evident reduction of HBV replication which mirrored the decrease of pgRNA transcription. The hSirt1/2 activator MC2791 and the JMJD3 inhibitor MC3119, albeit with different efficiency, inhibited both HBV replication and cccDNA transcription. Results represent a proof of concept that activation of hSirt1 and Ezh2 (through the inhibition of its functional antagonist JMJD3) by small molecules can induce an active epigenetic suppression of HBV cccDNA minichromosome similar to that observed with IFNα, and lead to persistent cccDNA silencing.

Lymphtoxin beta receptor (LTbR) agonisation represents basis for novel alternative therapeutic approach to curing chronic HBV infection.

The final study demonstrated that stimulating the lymphtoxin beta receptor (LTbR) provides an effective, long lasting and non-cytopathic mechanism for achieving effective HBV-cccDNA depletion in infected hepatocytes. Cell culture models including HBV-infected HepaRG cells and primary human hepatocytes were used to test the effect of antibodies stimulating human LTbR (BS1 or CBE11). Results show that a strong and dose-dependent anti-HBV effect was achieved by activation of the LTbR. All HBV replication markers were decreased with this treatment, including cccDNA in cells where HBV infection was already established.

Hepatitis B is the most prevalent cause of chronic viral hepatitis and a major global health problem. Prof. Fabien Zoulim, EASL Educational Councillor commented on the
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Contact: Dimple Natali
easlpressoffice@cohnwolfe.com
44-079-001-38904
European Association for the Study of the Liver
Source:Eurekalert

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