Open Access

Intrahepatic microcirculatory disorder, parenchymal hypoxia and NOX4 upregulation result in zonal differences in hepatocyte apoptosis following lipopolysaccharide- and D-galactosamine-induced acute liver failure in rats

  • Authors:
    • Masatake Tanaka
    • Kosuke Tanaka
    • Yuko Masaki
    • Masayuki Miyazaki
    • Masaki Kato
    • Kazuhiro Kotoh
    • Munechika Enjoji
    • Makoto Nakamuta
    • Ryoichi Takayanagi
  • View Affiliations

  • Published online on: December 3, 2013     https://doi.org/10.3892/ijmm.2013.1573
  • Pages: 254-262
  • Copyright: © Tanaka et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].

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Abstract

Although the mechanisms responsible for acute liver failure (ALF) have not yet been fully elucidated, studies have indicated that intrahepatic macrophage activation plays an important role in the pathogenesis of ALF through intrahepatic microcirculatory disorder and consequent parenchymal cell death. Intrahepatic microcirculatory disorder has been demonstrated in animal models using intravital microscopy; however, the limitations of this method include simultaneously evaluating blood flow and the surrounding pathological changes. Therefore, in this study, we devised a novel method involving tetramethylrhodamine isothiocyanate (TRITC)-dextran administration for the pathological assessment of hepatic microcirculation. In addition, we aimed to elucidate the mechanisms through which intrahepatic microcirculatory disorder progresses with relation to activated macrophages. ALF was induced in Wistar rats by exposure to lipopolysaccharide and D-galactosamine. Intrahepatic microcirculation and microcirculatory disorder in zone 3 (pericentral zone) of the livers of rats with ALF was observed. Immunohistochemical examinations in conjunction with TRITC-dextran images revealed that the macrophages were mainly distributed in zone 2 (intermediate zone), while cleaved caspase-3-positive hepatocytes, pimonidazole and hypoxia-inducible factor 1-α were abundant in zone 3. We also found that 4-hydroxy-2-nonenal and nicotinamide adenine dinucleotide phosphate oxidase (NOX)4-positive cells were predominantly located in the zone 3 parenchyma. The majority of apoptotic hepatocytes in zone 3 were co-localized with NOX4. Our results revealed that the apoptotic cells in zone 3 were a result of hypoxic conditions induced by intrahepatic microcirculatory disorder, and were not induced by activated macrophages. The increased levels of oxidative stress in zone 3 may contribute to the progression of hepatocyte apoptosis.
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2014-February
Volume 33 Issue 2

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Tanaka M, Tanaka K, Masaki Y, Miyazaki M, Kato M, Kotoh K, Enjoji M, Nakamuta M and Takayanagi R: Intrahepatic microcirculatory disorder, parenchymal hypoxia and NOX4 upregulation result in zonal differences in hepatocyte apoptosis following lipopolysaccharide- and D-galactosamine-induced acute liver failure in rats. Int J Mol Med 33: 254-262, 2014.
APA
Tanaka, M., Tanaka, K., Masaki, Y., Miyazaki, M., Kato, M., Kotoh, K. ... Takayanagi, R. (2014). Intrahepatic microcirculatory disorder, parenchymal hypoxia and NOX4 upregulation result in zonal differences in hepatocyte apoptosis following lipopolysaccharide- and D-galactosamine-induced acute liver failure in rats. International Journal of Molecular Medicine, 33, 254-262. https://doi.org/10.3892/ijmm.2013.1573
MLA
Tanaka, M., Tanaka, K., Masaki, Y., Miyazaki, M., Kato, M., Kotoh, K., Enjoji, M., Nakamuta, M., Takayanagi, R."Intrahepatic microcirculatory disorder, parenchymal hypoxia and NOX4 upregulation result in zonal differences in hepatocyte apoptosis following lipopolysaccharide- and D-galactosamine-induced acute liver failure in rats". International Journal of Molecular Medicine 33.2 (2014): 254-262.
Chicago
Tanaka, M., Tanaka, K., Masaki, Y., Miyazaki, M., Kato, M., Kotoh, K., Enjoji, M., Nakamuta, M., Takayanagi, R."Intrahepatic microcirculatory disorder, parenchymal hypoxia and NOX4 upregulation result in zonal differences in hepatocyte apoptosis following lipopolysaccharide- and D-galactosamine-induced acute liver failure in rats". International Journal of Molecular Medicine 33, no. 2 (2014): 254-262. https://doi.org/10.3892/ijmm.2013.1573