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Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers

  • Authors:
    • Krzysztof Zduniak
    • Piotr Ziółkowski
    • Pontus Regnell
    • Petra Tollet‑Egnell
    • Lina Åkesson
    • Martin E. Cooper
  • View Affiliations / Copyright

    Affiliations: Department of Pathology, Wrocław Medical University, Wrocław PL‑50‑368, Poland, AstraZeneca R&D Mölndal, Mölndal SE‑431 83, Sweden, Department of Molecular Medicine and Surgery, The Karolinska Institute, Karolinska University Hospital, Stockholm SE‑171 76, Sweden, Diabetes and Celiac Unit, Faculty of Medicine, Lund University, Malmö 205 02, Sweden
    Copyright: © Zduniak et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1227-1230
    |
    Published online on: January 29, 2016
       https://doi.org/10.3892/etm.2016.3036
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Abstract

The primary aim of the present study was to determine the expression levels of cannabinoid receptor type 1 (CB1) in steatotic rat livers. The secondary aim was to clarify whether steatosis and inflammation are more marked in areas with increased CB1 overexpression. For ethical and economic reasons, the present study investigated tissue from archived liver blocks, which were obtained from 38 rats that had been euthanized during the course of previous research at the Karolinska Institute of the Karolinska University Hospital (Stockholm, Sweden) and Lund University (Malmö, Sweden). Liver tissue fixed in formalin and embedded in paraffin was used that had been sourced from 36 male Sprague Dawley rats (age, 7 weeks) and 2 rats (age, 180 days) lacking normal leptin receptors. The rat liver tissue was stained with antibodies against CB1 and counterstained with hematoxylin. The expression of CB1 and the number of cells overexpressing CB1 were determined. Steatosis was scored according to the Dixon scoring system. CB1 overexpression and steatosis were detected in hepatocytes from all 38 livers sampled. The expression of CB1 was more marked in hepatocytes localized next to portal triads. Near the central veins, the expression was significantly weaker. Steatosis was more marked in areas of increased CB1 overexpression. Lymphocyte infiltration was more commonly observed in areas of increased CB1 overexpression. Therefore, the present results indicate that CB1 receptors are overexpressed in areas with steatosis, and indicate that CB1 in hepatocytes contributes to the formation of steatosis in rats, even prior to its progression to steatohepatitis. These results are consistent with publications reporting that CB1 in hepatocytes increases lipogenesis and contributes to inflammation.
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Copy and paste a formatted citation
Spandidos Publications style
Zduniak K, Ziółkowski P, Regnell P, Tollet‑Egnell P, Åkesson L and Cooper ME: Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers. Exp Ther Med 11: 1227-1230, 2016.
APA
Zduniak, K., Ziółkowski, P., Regnell, P., Tollet‑Egnell, P., Åkesson, L., & Cooper, M.E. (2016). Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers. Experimental and Therapeutic Medicine, 11, 1227-1230. https://doi.org/10.3892/etm.2016.3036
MLA
Zduniak, K., Ziółkowski, P., Regnell, P., Tollet‑Egnell, P., Åkesson, L., Cooper, M. E."Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers". Experimental and Therapeutic Medicine 11.4 (2016): 1227-1230.
Chicago
Zduniak, K., Ziółkowski, P., Regnell, P., Tollet‑Egnell, P., Åkesson, L., Cooper, M. E."Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers". Experimental and Therapeutic Medicine 11, no. 4 (2016): 1227-1230. https://doi.org/10.3892/etm.2016.3036
Copy and paste a formatted citation
x
Spandidos Publications style
Zduniak K, Ziółkowski P, Regnell P, Tollet‑Egnell P, Åkesson L and Cooper ME: Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers. Exp Ther Med 11: 1227-1230, 2016.
APA
Zduniak, K., Ziółkowski, P., Regnell, P., Tollet‑Egnell, P., Åkesson, L., & Cooper, M.E. (2016). Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers. Experimental and Therapeutic Medicine, 11, 1227-1230. https://doi.org/10.3892/etm.2016.3036
MLA
Zduniak, K., Ziółkowski, P., Regnell, P., Tollet‑Egnell, P., Åkesson, L., Cooper, M. E."Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers". Experimental and Therapeutic Medicine 11.4 (2016): 1227-1230.
Chicago
Zduniak, K., Ziółkowski, P., Regnell, P., Tollet‑Egnell, P., Åkesson, L., Cooper, M. E."Immunohistochemical analysis of cannabinoid receptor 1 expression in steatotic rat livers". Experimental and Therapeutic Medicine 11, no. 4 (2016): 1227-1230. https://doi.org/10.3892/etm.2016.3036
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