Hepatectomy (Regeneration) Model

Indication / Application

Efficacy testing of hepatotrophic factors and pro-regenerative drugs, evaluation of protective agents against post-hepatectomy liver failure (PHLF), screening of compounds accelerating liver tissue repair, and mechanistic studies on cell cycle progression, cytokine cascades, and metabolic adaptation during tissue regeneration.

Chronological schematic of liver mass restoration following 70% partial hepatectomy (a-f),

demonstrating compensatory lobular growth over a four-week period.. Source: ResearchGate

Modeling Method

• 70% Partial Hepatectomy (Higgins and Anderson Method): Following a midline laparotomy under general anesthesia, the liver is exteriorized. The left lateral and median lobes, which constitute approximately 68% to 70% of the total liver mass in rodents, are isolated. Silk sutures are tied securely around the pedicles of these lobes to prevent hemorrhage, and the lobes are resected. The remaining caudate and right lobes are returned to the abdominal cavity, and the incision is closed. Within minutes post-resection, hepatocytes in the remnant lobes exit the quiescent G0 phase and enter the cell cycle to initiate liver mass restoration.

Clinical Relevance

• Surgical Translation: Replicates the physiological challenges of major hepatic resections performed clinically for liver tumors, donor hepatectomy in living-donor liver transplantation, and severe trauma.

• Highly Coordinated Proliferation: The remaining liver lobes do not "regrow" their lost anatomical shapes; instead, they undergo compensatory hypertrophy and hyperplasia. This process relies on a tightly regulated cascade of TNF-alpha, IL-6, HGF (Hepatocyte Growth Factor), and EGF (Epidermal Growth Factor), matching human liver repair pathways.

Key Evaluation Endpoints

In Vivo & Physical Regeneration Parameters

• Liver Weight-to-Body Weight Ratio (G/B Ratio): Calculated at defined post-operative time points (e.g., 24h, 48h, 72h, 7d, 14d) to evaluate the rate and percentage of liver mass restoration.

• Survival Rates & Clinical Scoring: Tracking postoperative recovery, activity, and dietary intake.

Histopathology & Hepatocyte Proliferation

• Mitotic Index Tracking (H&E Staining): Standard histological scoring of mitotic figures per high-power field in regenerating liver tissues.

• Immunohistochemistry (IHC) for Proliferative Markers:

  • Ki-67 & PCNA Expression: Quantification of the percentage of hepatocytes actively undergoing DNA replication and cell cycle progression.

  • Brumex (BrdU) Incorporation Assay: Measures active DNA synthesis in vivo as a highly sensitive indicator of hepatocyte proliferation.

Biochemical, Metabolic & Molecular Profiling

• Liver Function Chemistries: Serial measurements of serum ALT, AST, total bilirubin, albumin, and lactate dehydrogenase (LDH) to monitor transient hepatic insufficiency and subsequent recovery.

• Regenerative Signaling Cascades: Quantitative PCR (RT-qPCR) and Western Blot analysis of essential regulatory proteins and cytokines (HGF, TGF-alpha, EGFR, Cyclin D1, STAT3, NF-kB, and IL-6).

• Energy & Metabolic Profiling: Assessment of hepatic glycogen stores and lipid droplet accumulation during the early regenerative phase.