Abstract
The issue of adequately quantitatively evaluating hepatic steatosis is still unresolved. Therefore, we compared three methods of quantitative assessment. Two groups of mice (n = 10 each) were fed standard chow (10% fat, SC group) or a high-fat diet (60% fat, HF group) for 16 weeks, and hepatic triglyceride (HT) and liver tissue were then studied. Paraplast-embedded tissues stained by hematoxylin and eosin (H-E) were compared to frozen sections stained by Oil Red-O (ORO). In addition, the volume density of steatosis (Vv[steatosis, liver]) was measured by point counting (P-C, sections H-E or ORO) or by image analysis (I-A, sections ORO). HT was significantly higher in the HF group (104% greater, P = 0.0004) than in the SC group. With P-C and H-E, Vv[steatosis, liver] was 4.80 ± 0.90% in the SC group and 33.50 ± 3.17% in the HF group (600% greater, P < 0.0001). With P-C and ORO, Vv[steatosis, liver] was 4.86 ± 0.89% in the SC group and 25.21 ± 1.27% in the HF group (420% greater, P < 0.0001). With I-A and ORO, Vv[steatosis, liver] was 4.17 ± 0.85% in the SC group and 23.35 ± 1.58% in the HF group (460% greater, P < 0.0001). Correlations between Vv[steatosis, liver] and HT were strong and significant in all methods. In conclusion, all methods were appropriate and reproducible. In P-C and H-E, there is a slight overestimation of steatosis in the HF animals in comparison to frozen sections and ORO; in frozen sections, differences between P-C and I-A are insignificant.
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Acknowledgments
The authors thank Thatiany Marinho and Angelica Figueiredo for their technical assistance. This research was supported by the Brazilian agencies CNPq (Conselho Nacional de Ciencia e Tecnologia, www.cnpq.br) and FAPERJ (Fundacao para o Amparo a Pesquisa do Estado do Rio de Janeiro, www.faperj.br).
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Catta-Preta, M., Mendonca, L.S., Fraulob-Aquino, J. et al. A critical analysis of three quantitative methods of assessment of hepatic steatosis in liver biopsies. Virchows Arch 459, 477–485 (2011). https://doi.org/10.1007/s00428-011-1147-1
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DOI: https://doi.org/10.1007/s00428-011-1147-1