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Updated: Aug 5, 2026
Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice
Published on: August 23, 2007
Two-photon imaging of lymphocyte motility and antigen response in intact lymph node
Mark J Miller1, Sindy H Wei, Ian Parker
1Department of Physiology and Biophysics, University of California, Irvine, CA 92697-4561, USA.
Insights
Live imaging of lymphocytes in lymph nodes reveals distinct T cell and B cell motility. Antigenic challenge alters T cell behavior, crucial for immune response initiation.
Area of Science:
- Immunology
- Cell Biology
- Microscopy
Background:
- Lymphocyte motility is essential for immune surveillance and response.
- Previous visualization methods were limited to in vitro systems, not reflecting native environments.
Purpose of the Study:
- To visualize and quantify the dynamic behavior of individual lymphocytes within intact lymph nodes.
- To compare the motility of T cells and B cells in vivo.
- To investigate the effects of antigenic challenge on lymphocyte behavior.
Main Methods:
- Utilized two-photon laser microscopy for in vivo imaging.
- Tracked individual living lymphocytes deep within intact lymph nodes.
- Quantified cell velocities and motility coefficients.
Main Results:
- T cells exhibited significantly higher peak velocities (over 25 micrometers/minute) and motility coefficients compared to B cells.
- Antigenic challenge induced a shift in T cell movement from random to clustered and swarming patterns.
- Demonstrated real-time imaging of fundamental lymphocyte behaviors in their native environment.
Conclusions:
- Two-photon microscopy enables unprecedented visualization of lymphocyte dynamics in vivo.
- Reveals distinct motility characteristics between T and B cells.
- Provides insights into immune cell trafficking and interaction dynamics crucial for initiating immune responses.
Abstract:
Lymphocyte motility is vital for trafficking within lymphoid organs and for initiating contact with antigen-presenting cells. Visualization of these processes has previously been limited to in vitro systems. We describe the use of two-photon laser microscopy to image the dynamic behavior of individual living lymphocytes deep within intact lymph nodes. In their native environment, T cells achieved peak velocities of more than 25 micrometers per minute, displaying a motility coefficient that is five to six times that of B cells. Antigenic challenge changed T cell trajectories from random walks to "swarms" and stable clusters. Real-time two-photon imaging reveals lymphocyte behaviors that are fundamental to the initiation of the immune response.
