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Mik P, Tonar Z, Malečková A, Eberlová L, Liška V, Pálek R, Rosendorf J, Jiřík M, Mírka H, Králíčková M, Witter K. Distribution of Connective Tissue in the Male and Female Porcine Liver: Histological Mapping and Recommendations for Sampling. J Comp Pathol 2018; 162:1-13. [PMID: 30060837 DOI: 10.1016/j.jcpa.2018.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 05/17/2018] [Accepted: 05/25/2018] [Indexed: 02/07/2023]
Abstract
The pig is a large animal model that is often used in experimental medicine. The aim of this study was to assess, in normal pig livers, sexual dimorphism in the normal fraction of hepatic interlobular and intralobular connective tissue (CT) in six hepatic lobes and in three macroscopical regions of interest (ROIs) with different positions relative to the liver vasculature. Using stereological point grids, the fractions of CT were quantified in histological sections stained with aniline blue and nuclear fast red. Samples (415 tissue blocks) were collected from healthy piglets, representing paracaval, paraportal and peripheral ROIs. There was considerable variability in the CT fraction at all sampling levels. In males the mean fraction of interlobular CT was 4.7 ± 2.4% (mean ± SD) and ranged from 0% to 11.4%. In females the mean fraction of the interlobular CT was 3.6 ± 2.2% and ranged from 0% to 12.3%. The mean fraction of intralobular (perisinusoidal summed with pericentral) CT was <0.2% in both sexes. The interlobular CT represented >99.8% of the total hepatic CT and the fractions were highly correlated (Spearman r = 0.998, P <0.05). The smallest CT fraction was observed in the left medial lobe and in the paracaval ROI and the largest CT fraction was detected in the quadrate lobe and in the peripheral ROI. For planning experiments involving the histological quantification of liver fibrosis and requiring comparison between the liver lobes, these data facilitate the power analysis for sample size needed to detect the expected relative increase or decrease in the fraction of CT.
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Affiliation(s)
- P Mik
- Department of Anatomy, Faculty of Medicine in Pilsen, Charles University, Karlovarska 48, Pilsen, Czech Republic
| | - Z Tonar
- Department of Histology and Embryology and Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Karlovarska 48, Pilsen, Czech Republic.
| | - A Malečková
- European Centre of Excellence NTIS, Faculty of Applied Sciences, University of West Bohemia, Univerzitní 22, Pilsen, Czech Republic
| | - L Eberlová
- Department of Anatomy, Faculty of Medicine in Pilsen, Charles University, Karlovarska 48, Pilsen, Czech Republic
| | - V Liška
- Department of Surgery and Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, Pilsen, Czech Republic
| | - R Pálek
- Department of Surgery and Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, Pilsen, Czech Republic
| | - J Rosendorf
- Department of Surgery and Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, Pilsen, Czech Republic
| | - M Jiřík
- European Centre of Excellence NTIS, Faculty of Applied Sciences, University of West Bohemia, Univerzitní 22, Pilsen, Czech Republic
| | - H Mírka
- Department of Imaging Methods and Biomedical Centre, Faculty of Medicine in Pilsen, Charles University, University Hospital in Pilsen, Czech Republic
| | - M Králíčková
- Department of Histology and Embryology and Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Karlovarska 48, Pilsen, Czech Republic
| | - K Witter
- Institute of Anatomy, Histology and Embryology, Department for Pathobiology, University of Veterinary Medicine Vienna, Veterinärplatz 1, Vienna, Austria
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