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Locating human splenic capillary sheaths in virtual reality.

B S Steiniger1, V Wilhelmi2, M Berthold3

  • 1Institute of Anatomy and Cell Biology, University of Marburg, Marburg, D-35037, Germany. steinigb@staff.uni-marburg.de.

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Summary

Human spleen capillary sheaths express CD271 and are located near arterioles. These structures may guide B-lymphocytes and interact with macrophages, influencing immune cell migration within the spleen.

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Area of Science:

  • Immunology
  • Cell Biology
  • Anatomy

Background:

  • Stromal capillary sheaths in human spleens are poorly understood.
  • CD271, the low-affinity nerve growth factor receptor p75, is highly expressed on these cells.

Purpose of the Study:

  • To investigate the localization and morphology of CD271-expressing capillary sheaths in the human spleen.
  • To hypothesize the functional role of these sheaths in immune cell trafficking.

Main Methods:

  • Double-staining of human spleen serial sections for CD271, smooth muscle alpha actin (SMA), and CD34.
  • Visualization of capillary sheaths, arterial tree, and endothelial cells using transmitted light microscopy.
  • Preliminary 3D reconstructions of specific spleen regions using virtual reality (VR).

Main Results:

  • A significant number of CD271-positive sheaths were identified in a post-arteriolar position, surrounding capillaries near arteriole bifurcations.
  • Capillary sheaths exhibited heterogeneous lengths and diameters, with some accompanying multiple capillary branches.
  • The study demonstrated an innovative VR approach for quality control and annotation of 3D reconstructions.

Conclusions:

  • Human splenic capillary sheaths, expressing CD271, are strategically located to potentially attract recirculating B-lymphocytes.
  • These structures may facilitate B-lymphocyte migration from the red pulp towards white pulp follicles.
  • Capillary sheaths could serve as crucial interaction sites for sheath macrophages and B-lymphocytes within the spleen.