in vivo Cell Lineage Analysis During Chemical Hepatocarcinogenesis in Rats Using Retroviral-Mediated Gene Transfer: Evidence for Dedifferentiation of Mature Hepatocytes
ABSTRACT Feeding adult rats with a diet containing 2-acetylaminofluorene (2-AAF) results in suppression of hepatocyte proliferation and stimulation of oval cell proliferation. Although oval cells may be facultative liver stem cells, the actual relationship between oval cells and liver cancer has not been clearly established in vivo. Our goal was to label hepatic cells in vivo using retroviral vectors and follow their fate during the early steps of chemically induced hepatocarcinogenesis. Oval cell proliferation was induced by continuous feeding with a carcinogenic diet containing 2-AAF. We used two different strategies to genetically label hepatic cells: (a) labeling of proliferating cells in rats fed 2-AAF by injecting recombinant retroviral vectors containing the beta-galactosidase gene either in a peripheral vein or in the common bile duct at the peak of oval cell proliferation and (b) prelabeling of hepatocytes by intravenously injecting recombinant vectors 1 day after partial hepatectomy and 1 week before subsequent administration of 2-AAF. Using the first strategy, transgene expression occurred in both oval cells and hepatocytes. Using the second strategy, we could selectively label, and hence study the fate of, differentiated hepatocytes. In the latter case, we observed clusters of beta-galactosidase-positive hepatocytes, some of them also expressing preneoplastic markers such as gamma-glutamyl transpeptidase as well as the placental form of glutathione-S-transferase. These results demonstrate that preneoplastic foci can originate from mature hepatocytes and are consistent with the hypothesis that dedifferentiation of mature hepatocytes may occur during the course of carcinogenic regimen.
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- "On the other hands, animal models where HPC activation is absent indicate that hepatocytes can also undergo neoplastic transformation. Cell-tracing studies with ␤galactosidase-expressing cells labeled with retroviral vector demonstrated that in diethylnitrosamine-induced HCC, about 17% of tumor cells were ␤-galactosidase-positive  . "
ABSTRACT: Hepatocellular carcinoma (HCC) accounts for approximately 6% of all new cancer cases diagnosed, and due to its aggressiveness, it is the second most common cause of cancer mortality worldwide. Based on different etiological factors, genetic backgrounds, and longtime development of the disease, HCC is characterized by a high phenotypic and functional heterogeneity. Tumor variability occurs both among patients (intertumoral heterogeneity) and within a single tumor (intratumoral heterogeneity). The intratumoral heterogeneity, in particular the variability of the markers of cancer stem cells (CSC) population may determine specific behavior and prognosis of the tumor. Understanding the cellular mechanisms originating CSC will provide an important hint in the management of HCC. The characterization of the cells of origin of cancer can have significant implication in early diagnosis, in the development of appropriate therapies and in the prevention of relapse. Here, we review recent evidences on the possible cellular origin of CSC that play a role in the heterogeneity of the HCC. Copyright © 2015 Elsevier Masson SAS. All rights reserved.Gastroentérologie Clinique et Biologique 07/2015; DOI:10.1016/j.clinre.2015.05.011 · 1.98 Impact Factor
Hepatocellular Carcinoma - Basic Research, 02/2012; , ISBN: 978-953-51-0023-2
- "In the tigroid basophilic lineage, initially the cells have abundant highly ordered stacks of the rough endoplasmic reticulum and thereby they have uniqueness. The scientist group further reported that the lineage is common to the animals treated with a low dose treatment of hepatocarcinogen (Gournay et al., 2002). Another type of cellular lineage has been found to involve in the development of hepatocellular carcinoma. "
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- "Additional evidence regarding the origin of HCC from hepatocytes comes from several studies done in rodents. In one such experiment, Gournay et al labeled hepatocytes with a retroviral vector expressing the β-galactosidase gene after two-thirds hepatectomy and fed the animals with 2-AAF to induce HCC.118 They later observed that some of the neoplastic nodules in the liver samples of these animals contained cells expressing β-galactosidase, indicating that they were directly derived from retrovirally-labeled hepatocytes. "
ABSTRACT: Primary hepatocellular carcinoma (HCC) is a common malignancy that has a poor prognosis because it is often diagnosed at an advanced stage. HCC normally develops as a consequence of underlying liver disease and is most often associated with cirrhosis. Surgical resection and liver transplantation are the current best options to treat liver cancer. However, problems associated with liver transplantation, such as shortage of donors, risk of immune rejection, and tissue damage following surgery provided the impetus for development of alternative therapies. The emerging field of stem cell therapy has raised hopes for finding curative options for liver cancer. Stem cells have the ability not only to proliferate after transplantation but also to differentiate into most mammalian cell types in vivo. In this review, progress on stem cell-derived technologies for the treatment of liver cancer is discussed.Stem Cells and Cloning: Advances and Applications 05/2010; 3:81-92. DOI:10.2147/SCCAA.S6886