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The three-dimensional structure of human splenic white pulp compartments
Birte Steiniger1, Lars Rüttinger, Peter J Barth
1Institute of Anatomy and Cell Biology, University of Marburg, Germany. steinigb@mailer.uni-marburg.de
Summary
Human splenic white pulp architecture differs from rodents. B- and T-lymphocyte regions interdigitate, challenging the continuous periarteriolar lymphatic T-cell sheath (PALS) model in humans.
Area of Science:
- Immunology
- Cell Biology
- Anatomy
Background:
- The precise spatial organization of B- and T-lymphocytes within the human spleen's white pulp is not well understood.
- Existing models of splenic microanatomy are largely based on rodent studies.
Purpose of the Study:
- To elucidate the three-dimensional arrangement of B- and T-lymphocytes in the human splenic white pulp.
- To compare human splenic microanatomy with that of rodents.
Main Methods:
- Performed 3D reconstruction of 150 serial sections of an adult human spleen.
- Utilized alternate staining for CD3 (T-cells) and CD20 (B-cells).
Main Results:
- Human splenic T-cell regions are interrupted by B-cell follicles, indicating no continuous periarteriolar lymphatic T-cell sheath (PALS).
- Arterioles in the human spleen can transition between T-cell rich areas and B-cell follicles.
- T- and B-cell compartments exhibit intricate interdigitation, with CD4(+) T-cells and fibroblasts potentially forming a shell at the follicular surface.
- IgD(++) B-cells extend from the marginal zone along the T-cell region's surface.
Conclusions:
- The microanatomy of the human splenic white pulp is distinct from that of rodents.
- These differences may impact lymphocyte trafficking and initial antigen-specific T- and B-cell interactions in the human spleen.