Isolation of Murine Lymph Node Stromal Cells
August 19th, 2014
Isolation of lymph node stromal cells is a multistep procedure including enzymatic digestion and mechanical disaggregation to obtain fibroblastic reticular cells, lymphatic and blood endothelial cells. In the described procedure, a short digestion is combined with automated mechanical disaggregation to minimize surface marker degradation of viable lymph node stromal cells.
The overall goal of this procedure is to isolate lymph node stromal cells. This is accomplished by first disrupting the lymph node capsule. In the second step, the lymph node fragments are digested with collagenase four and D nase one.
The enzymes are then replaced with collagenase D and D nase one, and the fragments are mechanically disaggregated with an automated multichannel pipette. Ultimately, the cell surface molecule expression of the isolated lymph node cells can be characterized by flow cytometry. The main advantage of this technique over existing method is that with this method, the lymph node SHR cells are digested using a standardized enzymatic procedure complemented by mechanical disaggregation that preserves the viability and surface molecule expression of the cells.
Begin by placing the dissected lymph nodes in a sterile Petri dish containing two milliliters of ice cold medium. Then use two one milliliter syringes equipped with 25 gauge needles to disrupt the lymph node capsules. Next, transfer the disrupted tissue to a five milliliter conical tube containing 750 microliters of medium, supplemented with collagenase four and DNA one and a magnetic stir.
Then place the tube in a beaker containing preheated 37 degrees Celsius water on a magnetic stirrer and stir the cell slurries at one round per second for 30 minutes. After stirring, let the lymph node fragment settle and then carefully remove the supernatant. Now enriched for non stromal cells transfer to the lymph node fragments 750 microliters of fresh medium, supplemented with collagenase D and D nase one, and then stir the tissue for another five minutes at 37 degrees Celsius.
Next, use an automated multi-channel pipette to disaggregate the lymph node tissue fragments in a 700 microliter volume for 10 cycles at maximal speed, and then stir the tissue fragments again after 10 minutes. Further, disaggregate the tissue clumps with the automated multi-channel pipette for 99 cycles at maximal speed. Then add 7.5 microliters of 0.5 molar EDTA to the tube and mix the tissue suspension for another 99 cycles with the automated pipette.
After the last disaggregation cycle, add 750 microliters of medium to the cell solution and filter the cells through a 70 micrometer nylon mesh. Then pellet the cells for five minutes at 1500 Gs and four degrees Celsius. To visualize lymph node stromal cell populations by flow cytometry, stain the appropriate cell samples with live dead tracker and the antibodies of interest in 100 microliters of HBSS containing 2%FCS for at least 20 minutes at four degrees Celsius in the dark.
Then wash the cells in 500 microliters of HBSS with FCS and resuspend. The pellets in 100 microliters of HBSS and FCS run the cells on a flow cytometer gating out the CD 45 positive cells to exclude the hematopoietic cells, then gait on the live singlet population. Finally, plot GP 38 versus CD 31 to visualize the T-zone reticular cells, lymphatic endothelial cells, blood endothelial cells, and double negative cells.
Cell populations. The total cell number recovered post digestion of the lymph node stromal cell subsets was slightly higher in the just demonstrated protocol compared to the link and Fletcher protocols demonstrating that the viability of the lymph node stromal cells after isolation by this protocol is similar to that recovered using published protocols. T-zone reticular cells and lymphatic endothelial cells isolated via this and the link and Fletcher protocols were compared for IAB CD one 40 a CD 80, PD L one, and CD 40 expression.
The expression of all five surface molecules was higher upon digestion with the just demonstrated protocol and the link protocol for both stromal cell subsets, suggesting that the degradation of some surface molecules by collagenase four and D is less robust than with collagenase p and DYS space. After watching this video, you should have a good understanding of how to successfully isolate the four major subpopulation of lymph node stroma cells while preserving the expression of several surface molecules useful for their further characterization and analysis.
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Overview
This procedure outlines the isolation of lymph node stromal cells through a combination of enzymatic digestion and mechanical disaggregation. The method aims to preserve the viability and surface marker expression of the isolated cells.
Key Study Components
Area of Science
- Cell biology
- Immunology
- Stromal cell research
Background
- Lymph node stromal cells play a critical role in immune responses.
- Isolation techniques are essential for studying these cells.
- Existing methods may compromise cell viability and surface marker integrity.
- This study presents a refined technique to address these issues.
Purpose of Study
- To isolate viable lymph node stromal cells effectively.
- To maintain surface molecule expression during the isolation process.
- To improve upon existing isolation methods.
Methods Used
- Disruption of the lymph node capsule.
- Digestion with collagenase and DNase enzymes.
- Mechanical disaggregation using an automated multichannel pipette.
- Characterization of cell surface molecules via flow cytometry.
Main Results
- The method successfully isolates lymph node stromal cells.
- Cell viability and surface marker expression are preserved.
- Flow cytometry confirms the integrity of isolated cells.
- The technique shows advantages over traditional methods.
Conclusions
- This refined isolation technique enhances the study of lymph node stromal cells.
- It offers a standardized approach to cell isolation.
- Future research can build upon these findings for immunological studies.
Frequently Asked Questions
Executive Industry Relevance
Isolating viable lymph node stromal cells with preserved surface marker expression enables mechanistic de-risking in immunomodulatory target validation. This method supports predictive confidence in preclinical models by maintaining stromal-immune crosstalk fidelity. It addresses a key discovery inflection point where stromal cell integrity impacts translational biomarker alignment and portfolio triage decisions.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of stromal-immune interactions in cytotoxic T cell response regulation.
- Operational Value: Preserves CD31 and gp38 surface molecule expression for accurate subset identification.
- Scientific Value: Supports biological de-risking of stromal targets in lymphoid tissue homeostasis pathways.
Screening & Assay Development
- Scientific Value: Generates standardized single-cell suspensions for reproducible flow cytometry-based assays.
- Operational Value: Combines enzymatic digestion with automated mechanical disaggregation to enhance yield and viability.
- Scientific Value: Provides quantitative stromal cell recovery metrics for assay standardization and cross-lab reproducibility.
Translational & Preclinical Research
- Scientific Value: Maintains stromal cell functionality for downstream analysis of lymphocyte activation and differentiation.
- Operational Value: Enables consistent isolation of T-zone reticular cells, lymphatic endothelial cells, blood endothelial cells, and double negative subsets.
- Scientific Value: Supports translational biomarker alignment by preserving surface molecules relevant to stromal-immune crosstalk.
Pipeline & Workflow Integration
The method integrates into early discovery workflows where stromal cell viability and marker preservation are critical for hypothesis testing and pathway clarification in immunomodulation studies.
- Discovery Biology: Supports stromal cell isolation for functional validation of lymphoid tissue microenvironment targets.
- Screening: Delivers reproducible single-cell suspensions enabling standardized stromal cell-based assays.
- Analytics: Generates flow cytometry-ready samples for quantitative surface marker analysis and subset discrimination.
- Translational Research: Maintains stromal-immune interface integrity for preclinical continuity in lymphoid tissue models.
- Enterprise Reuse: Establishes a standardized enzymatic-mechanical protocol adaptable across lymphoid tissue stromal cell isolation workflows.
Operational & Enterprise Impact
- Scientific Value: Predictive confidence in stromal target validation through preserved surface molecule expression.
- Operational Value: Standardized protocol reduces variability in stromal cell isolation across experiments.
- Strategic Value: Informs go/no-go decisions by reducing mechanistic ambiguity in stromal-immune interaction studies.
- Portfolio Impact: Enables risk-adjusted prioritization of stromal targets based on reliable preclinical stromal cell data.
Implementation Considerations
- Requires expertise in enzymatic tissue digestion and flow cytometry staining protocols.
- Dependent on automated multichannel pipette for mechanical disaggregation and collagenase/DNase enzyme availability.
- Necessitates standardization of digestion times and mechanical cycles across users and labs.
- Requires adaptation of enzyme concentrations for different lymphoid tissue sources or stromal subsets.
- Limited by stromal cell sensitivity to prolonged enzymatic exposure, necessitating timed disruption steps.
