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- 2022-12-28
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Droplet digital PCR assay provides intrahepatic HBV cccDNA quantification tool for clinical application
Sanae Hayashi 1 2 , Masanori Isogawa 1 , Keigo Kawashima 1 , Kyoko Ito 1 , Natthaya Chuaypen 3 , Yuji Morine 4 , Mitsuo Shimada 4 , Nobuyo Higashi-Kuwata 5 , Takehisa Watanabe 2 , Pisit Tangkijvanich 3 , Hiroaki Mitsuya 5 6 7 , Yasuhito Tanaka 8 9
Affiliations
Affiliations
1
Department of Virology and Liver Unit, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.
2
Department of Gastroenterology and Hepatology, Faculty of Life Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan.
3
Center of Excellence in Hepatitis and Liver Cancer, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
4
Department of Surgery, Tokushima University, Tokushima, Japan.
5
Department of Refractory Viral Infections, National Center for Global Health and Medicine Research Institute, Tokyo, Japan.
6
Experimental Retrovirology Section, HIV and AIDS Malignancy Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
7
Department of Clinical Sciences, Kumamoto University Hospital, Kumamoto, Japan.
8
Department of Virology and Liver Unit, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan. [email protected].
9
Department of Gastroenterology and Hepatology, Faculty of Life Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan. [email protected].
PMID: 35136096 DOI: 10.1038/s41598-022-05882-9
Abstract
The persistence of covalently closed circular DNA (cccDNA) poses a major obstacle to curing chronic hepatitis B (CHB). Here, we used droplet digital PCR (ddPCR) for cccDNA quantitation. The cccDNA-specific ddPCR showed high accuracy with the dynamic range of cccDNA detection from 101 to 105 copies/assay. The ddPCR had higher sensitivity, specificity and precisely than qPCR. The results of ddPCR correlated closely with serum HB core-related antigen and HB surface antigen (HBsAg) in 24 HBV-infected human-liver-chimeric mice (PXB-mice). We demonstrated that in 2 PXB-mice after entecavir treatment, the total cccDNA content did not change during liver repopulation, although the cccDNA content per hepatocyte was reduced after the treatment. In the 6 patients with HBV-related hepatocellular carcinoma, ddPCR detected cccDNA in both tumor and non-tumor tissues. In 13 HBeAg-negative CHB patients with pegylated interferon alpha-2a, cccDNA contents from paired biopsies were more significantly reduced in virological response (VR) than in non-VR at week 48 (p = 0.0051). Interestingly, cccDNA levels were the lowest in VR with HBsAg clearance but remained detectable after the treatment. Collectively, ddPCR revealed that cccDNA content is stable during hepatocyte proliferation and persists at quantifiable levels, even after serum HBsAg clearance.
© 2022. The Author(s). |
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