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Title: Inferring Viral Dynamics in Chronically HCV Infected Patients from the Spatial Distribution of Infected Hepatocytes

Abstract

Chronic liver infection by hepatitis C virus (HCV) is a major public health concern. Despite partly successful treatment options, several aspects of intrahepatic HCV infection dynamics are still poorly understood, including the preferred mode of viral propagation, as well as the proportion of infected hepatocytes. Answers to these questions have important implications for the development of therapeutic interventions. In this study, we present methods to analyze the spatial distribution of infected hepatocytes obtained by single cell laser capture microdissection from liver biopsy samples of patients chronically infected with HCV. By characterizing the internal structure of clusters of infected cells, we are able to evaluate hypotheses about intrahepatic infection dynamics. We found that individual clusters on biopsy samples range in size from 4-50 infected cells. In addition, the HCV RNA content in a cluster declines from the cell that presumably founded the cluster to cells at the maximal cluster extension. These observations support the idea that HCV infection in the liver is seeded randomly (e.g. from the blood) and then spreads locally. Assuming that the amount of intracellular HCV RNA is a proxy for how long a cell has been infected, we estimate based on models of intracellular HCV RNA replicationmore » and accumulation that cells in clusters have been infected on average for less than a week. Further, we do not find a relationship between the cluster size and the estimated cluster expansion time. Lastly, our method represents a novel approach to make inferences about infection dynamics in solid tissues from static spatial data.« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Heidelberg Univ. (Germany)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Glasgow, Scotland (United Kingdom)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1259480
Grant/Contract Number:  
AC52-06NA25396; GM103452; DA016078l; EY001765
Resource Type:
Accepted Manuscript
Journal Name:
PLoS Computational Biology (Online)
Additional Journal Information:
Journal Name: PLoS Computational Biology (Online); Journal Volume: 10; Journal Issue: 11; Journal ID: ISSN 1553-7358
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Graw, Frederik, Balagopal, Ashwin, Kandathil, Abraham J., Ray, Stuart C., Thomas, David L., Ribeiro, Ruy M., Perelson, Alan S., and Yates, Andrew J. Inferring Viral Dynamics in Chronically HCV Infected Patients from the Spatial Distribution of Infected Hepatocytes. United States: N. p., 2014. Web. doi:10.1371/journal.pcbi.1003934.
Graw, Frederik, Balagopal, Ashwin, Kandathil, Abraham J., Ray, Stuart C., Thomas, David L., Ribeiro, Ruy M., Perelson, Alan S., & Yates, Andrew J. Inferring Viral Dynamics in Chronically HCV Infected Patients from the Spatial Distribution of Infected Hepatocytes. United States. https://doi.org/10.1371/journal.pcbi.1003934
Graw, Frederik, Balagopal, Ashwin, Kandathil, Abraham J., Ray, Stuart C., Thomas, David L., Ribeiro, Ruy M., Perelson, Alan S., and Yates, Andrew J. Thu . "Inferring Viral Dynamics in Chronically HCV Infected Patients from the Spatial Distribution of Infected Hepatocytes". United States. https://doi.org/10.1371/journal.pcbi.1003934. https://www.osti.gov/servlets/purl/1259480.
@article{osti_1259480,
title = {Inferring Viral Dynamics in Chronically HCV Infected Patients from the Spatial Distribution of Infected Hepatocytes},
author = {Graw, Frederik and Balagopal, Ashwin and Kandathil, Abraham J. and Ray, Stuart C. and Thomas, David L. and Ribeiro, Ruy M. and Perelson, Alan S. and Yates, Andrew J.},
abstractNote = {Chronic liver infection by hepatitis C virus (HCV) is a major public health concern. Despite partly successful treatment options, several aspects of intrahepatic HCV infection dynamics are still poorly understood, including the preferred mode of viral propagation, as well as the proportion of infected hepatocytes. Answers to these questions have important implications for the development of therapeutic interventions. In this study, we present methods to analyze the spatial distribution of infected hepatocytes obtained by single cell laser capture microdissection from liver biopsy samples of patients chronically infected with HCV. By characterizing the internal structure of clusters of infected cells, we are able to evaluate hypotheses about intrahepatic infection dynamics. We found that individual clusters on biopsy samples range in size from 4-50 infected cells. In addition, the HCV RNA content in a cluster declines from the cell that presumably founded the cluster to cells at the maximal cluster extension. These observations support the idea that HCV infection in the liver is seeded randomly (e.g. from the blood) and then spreads locally. Assuming that the amount of intracellular HCV RNA is a proxy for how long a cell has been infected, we estimate based on models of intracellular HCV RNA replication and accumulation that cells in clusters have been infected on average for less than a week. Further, we do not find a relationship between the cluster size and the estimated cluster expansion time. Lastly, our method represents a novel approach to make inferences about infection dynamics in solid tissues from static spatial data.},
doi = {10.1371/journal.pcbi.1003934},
journal = {PLoS Computational Biology (Online)},
number = 11,
volume = 10,
place = {United States},
year = {Thu Nov 13 00:00:00 EST 2014},
month = {Thu Nov 13 00:00:00 EST 2014}
}

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