Related Experiment Video
Updated: May 25, 2026
Isolation and Activation of Murine Lymphocytes
Published on: October 30, 2016
Influence of NK cell magnetic bead isolation methods on phenotype and function of murine NK cells
Kathrin Meinhardt1, Irena Kroeger, Alexandra Abendroth
1Department of Internal Medicine 5-Hematology/Oncology, University of Erlangen-Nürnberg, Erlangen, Germany.
Abstract:
Natural killer (NK) cells are a promising tool for cell therapy due to their capacity to lyse tumor cells without prior activation and their influence on the innate as well as the adaptive immunity. To characterize distinct NK cell populations, it is important to find a reliable isolation method. We investigated separation methods for NK cell isolation by magnetic bead labeling. There are three commonly used different MACS protocols to isolate NK cells from murine spleen: CD49b (DX5) MicroBeads, the NK Cell Isolation Kit and a separation method which is based on a positive selection for NKp46 expressing cells. Interestingly, we found a significant difference of NK cell purities depending on the mouse strains and the purification protocol used. We observed a significantly higher level of purity and yield of NK cells by preparations from Balb/c splenocytes. In this study, we modified the negative selection protocol and adapted it to C57Bl/6 mice to obtain equal purity, viability and yields of NK cells in the different mouse strains. Moreover, we optimized the NKp46 NK cell selection method by addition of a B cell depletion step. To our knowledge, this is the first report that has directly compared and essentially modified the different NK cell purification strategies in parallel, both in C57Bl/6 and Balb/c mouse strains. Altogether, these results are a basic prerequisite for the further development of NK cell therapy protocols in murine in vivo models.
Insights
This study compares magnetic bead-based methods for isolating natural killer (NK) cells from mouse spleens. Modifications were made to improve purity and yield across different mouse strains, crucial for advancing NK cell therapies.
Area of Science:
- Immunology
- Cell Therapy
Background:
- Natural killer (NK) cells are vital for innate and adaptive immunity and show promise for cancer cell therapy.
- Reliable isolation of distinct NK cell populations is essential for therapeutic development.
Purpose of the Study:
- To investigate and compare different magnetic-activated cell sorting (MACS) protocols for isolating NK cells from murine spleens.
- To optimize NK cell isolation methods for improved purity, viability, and yield across different mouse strains.
Main Methods:
- Comparison of three MACS protocols: CD49b (DX5) MicroBeads, NK Cell Isolation Kit, and NKp46 positive selection.
- Modification of a negative selection protocol for C57Bl/6 mice.
- Optimization of NKp46 selection by incorporating B cell depletion.
Main Results:
- Significant variations in NK cell purity and yield were observed based on mouse strain and purification protocol.
- Balb/c splenocytes yielded higher purity and yield of NK cells compared to other strains.
- Modified protocols achieved comparable NK cell purity, viability, and yield across C57Bl/6 and Balb/c mice.
Conclusions:
- The study provides optimized NK cell purification strategies for C57Bl/6 and Balb/c mice.
- These findings are foundational for developing NK cell therapy protocols in murine models.
- Direct comparison and modification of purification methods enhance NK cell isolation consistency.
