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Updated: Aug 26, 2025
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Published on: March 30, 2019
Selective gene expression profiling contributes to a better understanding of the molecular pathways underlying the
Janine Arlt1, Sebastian Vlaic2, Ronny Feuer3
1Experimental Transplantation Surgery, Department of General, Visceral and Vascular Surgery, Jena University Hospital, Drackendorfer Str. 1, 07747, Jena, Germany.
Background:
In previous studies, five vasoactive drugs were investigated for their effect on the recovery process after extended liver resection without observing relevant improvements. We hypothesized that an analysis of gene expression could help to identify potentially druggable pathways and could support the selection of promising drug candidates.
Methods:
Liver samples obtained from rats after combined 70% partial hepatectomy and right median hepatic vein ligation (n = 6/group) sacrificed at 0 h, 24 h, 48 h, and 7days were selected for this study. Liver samples were collected from differentially perfused regions of the median lobe (obstruction-zone, border-zone, normal-zone). Gene expression profiling of marker genes regulating hepatic hemodynamics, vascular remodeling, and liver regeneration was performed with microfluidic chips. We used 3 technical replicates from each sample. Raw data were normalized using LEMming and differentially expressed genes were identified using LIMMA.
Results:
The strongest differences were found in obstruction-zone at 24 h and 48 h postoperatively compared to all other groups. mRNA expression of marker genes from hepatic hemodynamics pathways (iNOS,Ptgs2,Edn1) was most upregulated.
Conclusion:
These upregulated genes suggest a strong vasoconstrictive effect promoting arterial hypoperfusion in the obstruction-zone. Reducing iNOS expression using selective iNOS inhibitors seems to be a promising approach to promote vasodilation and liver regeneration.
Insights
Gene expression analysis after liver resection revealed upregulated vasoconstrictive pathways in the obstruction zone. Targeting inducible nitric oxide synthase (iNOS) may improve vasodilation and liver regeneration.
Area of Science:
- Hepatology
- Molecular Biology
- Vascular Biology
Background:
- Previous vasoactive drug trials failed to improve liver resection recovery.
- Gene expression analysis was hypothesized to identify new therapeutic targets.
Purpose of the Study:
- To investigate gene expression changes post-liver resection.
- To identify molecular pathways involved in liver regeneration and hemodynamics.
Main Methods:
- Gene expression profiling of liver samples from rats undergoing 70% partial hepatectomy and hepatic vein ligation.
- Analysis of differentially perfused zones (obstruction, border, normal) at multiple time points.
- Utilized microfluidic chips, LEMming normalization, and LIMMA for differential gene expression analysis.
Main Results:
- Significant gene expression differences observed in the obstruction zone at 24 and 48 hours post-surgery.
- Upregulation of hepatic hemodynamics marker genes (iNOS, Ptgs2, Edn1) in the obstruction zone.
- Indicates a strong vasoconstrictive effect contributing to hypoperfusion.
Conclusions:
- Upregulated genes suggest a vasoconstrictive mechanism hindering liver regeneration.
- Selective inhibition of inducible nitric oxide synthase (iNOS) presents a potential therapeutic strategy.
- Targeting iNOS may promote vasodilation and enhance liver regeneration post-resection.
