Circulating Hepatocyte Nuclear Factor-4α is Associated with Metabolic Dysfunction

What is it about?

Background Metabolic syndrome (MS) driven by excessive dietary fructose is associated with progressive hepatic injury including steatosis, inflammation, fibrosis, and apoptosis. Hepatocyte nuclear factor-4α (HNF4α), a master transcriptional regulator of hepatic metabolism, is typically down-regulated in metabolic dysfunction-associated steatotic liver disease (MASLD). Objectives To characterize hepatic histopathological, immunohistochemical, and morphometric alterations in fructose-induced MS in Wistar rats and evaluate serum HNF4α levels and their correlations with biochemical and metabolic parameters. Methods Twenty male Wistar rats were allocated to control and MS groups (10% fructose in drinking water, 8 weeks; n = 10 each). Liver sections were stained with H&E and Masson’s trichrome and immunostained for α-SMA, caspase-3, and PCNA. Morphometric analysis used Image-Pro Plus v6.0 and ImageJ. Biochemical parameters, serum HNF4α (quantified by commercial quantitative sandwich ELISA; R&D Systems, sensitivity 9.0 pg/mL), and oxidative stress markers were measured and analyzed using unpaired Student’s t-test with Cohen’s d effect sizes and Pearson correlation. Results MS rats showed significant increases in body weight, liver weight, hepatic index, fasting glucose, insulin, HOMA-IR, lipid profile, and serum HNF4α (771.6 ± 120.33 vs. 195.35 ± 62.3 pg/ml; p < 0.001; Cohen’s d = 6.0), with reduced HDL and total antioxidant capacity. Histology revealed macrovesicular steatosis, inflammation, and periportal, perisinusoidal, and pericentrilobular fibrosis. Morphometric analysis confirmed significant increases in collagen area%, α-SMA, caspase-3, and PCNA labeling index (all p < 0.001). Serum HNF4α correlated strongly with metabolic, lipid, and oxidative parameters (|r|=0.52–0.87), particularly malondialdehyde (r = 0.87), body weight (r = 0.85), and HDL (r = − 0.86). Paradoxically, circulating HNF4α was elevated despite its typical hepatic down-regulation in MASLD; it is presented as a candidate biomarker requiring independent validation. Conclusions Comprehensive morphometric analysis of five staining modalities provides objective, zone-specific quantification confirming the coordinated nature of the injury–fibrosis–regeneration axis. This elevation may reflect hepatocellular leakage or a transient compensatory response to early-stage metabolic stress, highlighting its potential utility as a non-invasive biomarker candidate requiring independent validation. However, because hepatic HNF4α protein and gene expression were not measured and conventional liver-injury markers were not assayed, these data demonstrate association rather than mechanistic involvement.

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Photo by Europeana on Unsplash

Photo by Europeana on Unsplash

Why is it important?

Background Metabolic syndrome (MS) driven by excessive dietary fructose is associated with progressive hepatic injury including steatosis, inflammation, fibrosis, and apoptosis. Hepatocyte nuclear factor-4α (HNF4α), a master transcriptional regulator of hepatic metabolism, is typically down-regulated in metabolic dysfunction-associated steatotic liver disease (MASLD). Objectives To characterize hepatic histopathological, immunohistochemical, and morphometric alterations in fructose-induced MS in Wistar rats and evaluate serum HNF4α levels and their correlations with biochemical and metabolic parameters. Methods Twenty male Wistar rats were allocated to control and MS groups (10% fructose in drinking water, 8 weeks; n = 10 each). Liver sections were stained with H&E and Masson’s trichrome and immunostained for α-SMA, caspase-3, and PCNA. Morphometric analysis used Image-Pro Plus v6.0 and ImageJ. Biochemical parameters, serum HNF4α (quantified by commercial quantitative sandwich ELISA; R&D Systems, sensitivity 9.0 pg/mL), and oxidative stress markers were measured and analyzed using unpaired Student’s t-test with Cohen’s d effect sizes and Pearson correlation. Results MS rats showed significant increases in body weight, liver weight, hepatic index, fasting glucose, insulin, HOMA-IR, lipid profile, and serum HNF4α (771.6 ± 120.33 vs. 195.35 ± 62.3 pg/ml; p < 0.001; Cohen’s d = 6.0), with reduced HDL and total antioxidant capacity. Histology revealed macrovesicular steatosis, inflammation, and periportal, perisinusoidal, and pericentrilobular fibrosis. Morphometric analysis confirmed significant increases in collagen area%, α-SMA, caspase-3, and PCNA labeling index (all p < 0.001). Serum HNF4α correlated strongly with metabolic, lipid, and oxidative parameters (|r|=0.52–0.87), particularly malondialdehyde (r = 0.87), body weight (r = 0.85), and HDL (r = − 0.86). Paradoxically, circulating HNF4α was elevated despite its typical hepatic down-regulation in MASLD; it is presented as a candidate biomarker requiring independent validation. Conclusions Comprehensive morphometric analysis of five staining modalities provides objective, zone-specific quantification confirming the coordinated nature of the injury–fibrosis–regeneration axis. This elevation may reflect hepatocellular leakage or a transient compensatory response to early-stage metabolic stress, highlighting its potential utility as a non-invasive biomarker candidate requiring independent validation. However, because hepatic HNF4α protein and gene expression were not measured and conventional liver-injury markers were not assayed, these data demonstrate association rather than mechanistic involvement.

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