Murine Perineural Invasion Model: Generating an In Vivo Model to Simulate Perineural Invasion in Mouse Sciatic Nerve
JoVE Encyclopedia of Experiments
Cancer Research
0 views • 5:11 min • July 8th, 2025
Perineural invasion is a rare metastatic phenomenon wherein cancer cells metastasize away from the site of origin to invade the perineural space within the nerves. The nerve microenvironment provides a suitable environment for cancer growth and proliferation.
To simulate perineural invasion in vivo, prep an anesthetized mouse in the prone position. Make a small, parallel incision below the thigh bone - femur. Separate the thigh muscles to reveal the underlying sciatic nerve - the largest and most easily accessible nerve in the body.
The sciatic nerve originates in the lower spine and runs through the pelvic muscles to each leg. It relays signals for coordinated movement of lower limbs. Next, remove the surrounding muscles from the nerve and pull it outwards using a sterilized spatula for injection support.
Now, take a syringe filled with the cancer cell suspension and inject it parallelly into the nerve. A visible bulge in the nerve confirms a successful injection, while any leakage around the injection site indicates a failed attempt. Briefly, allow the cells to stabilize within the nerve.
Then, gently retract the needle and reposition the muscles. Subsequently, suture the incision. Allow the mouse to recover. Eventually, the cancer cells start migrating from the injection site towards the spinal cord, confirming perineural invasion.
On the day before the surgery, remove the fur along the length of femur on the dorsal side of a 8-week-old male or female C57BL/6J mice with either a surgical clipper or a chemical hair removal agent. On the day of the surgery, disinfect the stage, anesthetize the mice using 2% isoflurane in an induction chamber, and apply vet ointment to the eyes to prevent dryness under anesthesia.
Inject weight-appropriate amount of analgesic subcutaneously and transfer a mouse to a nose cone in the surgical area. Heat support is provided throughout the surgical procedure. Place the anesthetized mouse on its ventral side and gently secure each limb with hypoallergenic tape to create mild tension in the limb to be injected.
Clean the injection site with betadine swab, then again with 70% alcohol. Repeat this process two more times and make sure that no loose hair remains on the surgical field. As a final step, apply betadine solution to the surgical area. After donning sterile gloves and placing the sterile drape, use a dedicated sterile tool to apply toe pinch prior to making the incision under the drape.
Then, use sterile small scissors to make a 1-centimeter incision about 2 millimeters below and parallel to the femur. Retract the skin with forceps laterally to expose the muscles underneath. Separate the gluteus maximus and biceps femoris muscles along a fascial plane and expose the sciatic nerve underneath. Free the nerve from the surrounding muscles using blunt dissection.
Draw 3 microliters of cancer cells from the pellet into a sterile 10-microliter syringe. Place a small metal spatula underneath the nerve at the point of injection for support. While visualizing with the dissecting microscope, keep the needle parallel to the nerve and insert it into the nerve. Be careful not to puncture through the back of the nerve.
Slowly inject the cells into the nerve over 5 seconds. A formation of a bulb in the injection area indicates a good injection. Leave the needle in place for 3 seconds to minimize backflow before removing the needle gently. Proper injection of the cancer cells in the sciatic nerve is critical. If the cells are injected outside of the nerve, the consistency of invasion will suffer. However, with practice and experience, this is very rare.
After injection, return the nerve to its original position and cover the nerve with the overlying muscles. Treat the mice with proper analgesia and then close the skin with 5-0 nylon sutures. Place the mouse alone in a clean cage for observation and provide heat support during recovery until it has regained sufficient consciousness to maintain sternal recumbency.
Overview
This study investigates perineural invasion, a rare metastatic process where cancer cells invade the perineural space within nerves. The methodology involves a surgical procedure on mice to simulate this phenomenon and observe cancer cell migration.
Key Study Components
Area of Science
- Neuroscience
- Oncology
- Experimental Surgery
Background
- Perineural invasion is associated with aggressive cancer behavior.
- The nerve microenvironment supports cancer cell growth.
- Understanding this process can aid in developing targeted therapies.
- Animal models are essential for studying perineural invasion mechanisms.
Purpose of Study
- To simulate perineural invasion in a controlled environment.
- To observe the migration of cancer cells from the nerve to the spinal cord.
- To refine surgical techniques for studying cancer metastasis.
Methods Used
- Preparation of anesthetized mice for surgery.
- Incision and exposure of the sciatic nerve.
- Injection of cancer cell suspension into the nerve.
- Post-operative care and observation of cancer cell migration.
Main Results
- Successful injection of cancer cells confirmed by visible bulge.
- Cells migrated towards the spinal cord, indicating perineural invasion.
- Proper surgical technique minimized complications.
- Animal models provided insights into cancer behavior in nerve environments.
Conclusions
- The study successfully modeled perineural invasion in mice.
- Findings contribute to understanding cancer metastasis mechanisms.
- Future research can build on these techniques for therapeutic development.
Frequently Asked Questions
Executive Industry Relevance
This model enables mechanistic de-risking of perineural invasion, a key pathway in aggressive cancer metastasis, by providing a reproducible in vivo system to study cancer-nerve interactions. It supports target validation by allowing direct observation of cancer cell migration along nerves, informing therapeutic hypotheses. The assay-like readout of invasion extent aids preclinical model prioritization and portfolio triage in oncology discovery.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Interrogates therapeutic hypotheses by simulating cancer cell invasion into the perineural space, clarifying nerve-mediated metastasis mechanisms.
- Operational Value: Enables biological de-risking of targets through direct visualization of cancer cell migration from injection site to spinal cord.
- Predictive Value: Supports predictive confidence in target selection by quantifying invasion extent as a functional readout of nerve-tumor interactions.
Screening & Assay Development
- Assay Readiness: Prepares a validated biological system (sciatic nerve with cancer cell engraftment) for downstream compound screening to inhibit invasion.
- Quantitative Output: Generates measurable invasion metrics (bulb formation, migration distance) enabling standardized, reproducible compound evaluation.
- Scalability: Supports platform reuse across cancer cell lines to assess nerve-invasive potential in a standardized surgical model.
Translational & Preclinical Research
- Disease Relevance: Models a clinically significant metastatic process in pancreatic cancer, aligning with translational biomarker studies of nerve-associated progression.
- Preclinical Continuity: Bridges discovery and preclinical validation by providing a disease-relevant system to test inhibitors of perineural spread.
- Risk-Adjusted Decisions: Informs go/no-go criteria by quantifying invasion suppression, reducing late-stage biological risk in metastasis-targeting programs.
Pipeline & Workflow Integration
The model fits within the oncology discovery continuum from target validation through lead identification to preclinical efficacy testing, specifically enabling mechanistic de-risking of metastasis pathways.
- Discovery Biology: Supports hypothesis testing of nerve-tumor interactions and pathway clarification in metastasis mechanisms.
- Screening: Delivers assay-ready systems with quantitative invasion readouts for reliable compound screening against perineural invasion.
- Analytics: Provides measurable outputs (injection success via bulge formation, migration toward spinal cord) that enable comparative analysis of experimental conditions.
- Translational Research: Connects to preclinical validation by modeling a human-relevant metastatic phenotype in a murine system.
- Enterprise Reuse: Establishes a reusable surgical platform for evaluating multiple oncogenic targets or compounds affecting nerve-invasive behavior.
Operational & Enterprise Impact
- Scientific Value: Mechanistic de-risking of metastasis targets through direct observation of cancer cell migration in nerve microenvironment.
- Operational Value: Standardized surgical procedure with defined success criteria (visible bulge, minimal leakage) ensuring reproducibility across operators.
- Strategic Value: Improves go/no-go decisions by providing early, predictive evidence of anti-invasive efficacy, reducing investment in ineffective candidates.
- Portfolio Impact: Enables risk-adjusted prioritization of metastasis-targeting programs based on functional inhibition of perineural spread.
Implementation Considerations
- Requires expertise in murine surgical techniques, nerve dissection, and sterile injection procedures.
- Dependent on microsurgical instrumentation, including fine forceps, spatulas, and stereomicroscopes for nerve handling.
- Necessitates cross-team standardization between surgery, oncology, and imaging groups for consistent tumor engraftment and invasion scoring.
- Adaptation considerations include cancer cell line variability and injection volume optimization to avoid nerve damage or ectopic spread.
- Practical limitations include surgical variability in nerve exposure and the need for postoperative monitoring to distinguish true invasion from inflammation or leakage.
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Last updated: 22 August 2026