Abstract
Immunohistological analysis of 31 human spleens from the 11th week of gestation to the early postnatal period suggested that fetal organ development may be preliminarily divided into four stages. At stage 0 the organ anlage contained erythrocyte precursors, few macrophages and almost no lymphocytes. Fetal spleens of stage I exhibited arterial vascular lobules and lymphocytes just began colonizing the organ. At stage II, B and T lymphocytes formed periarteriolar clusters. B cell clusters predominated, because B cells aggregated around the more peripheral branches of splenic arterioles, while T cells occupied the more centrally located parts of the vessels. The vascular lobules of stage I and II consisted of central arterioles surrounded by B cells, capillaries and peripheral venules. The lobular architecture slowly dissolved at late stage II when sinuses grew out from the peripheral venules into the centre of the lobule. Interestingly, the B cell accumulations around peripheral arterioles did not represent the precursors of follicles, but apparently persisted as periarteriolar B cell clusters in the adult splenic red pulp, while follicles containing FDCs developed at late stage II from B cells in direct contact to T cell clusters around larger arterial vessels. At stage III before birth the lobular architecture was no longer recognized. The chemokine CXCL13 was already present in vascular smooth muscle and adjacent stromal cells at stage I before B cells immigrated. CCL21, on the contrary, was only demonstrated in fibroblast-like cells supporting T cell clusters from stage II onwards.
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Abbreviations
- ABC:
-
Avidin-biotinylated peroxidase complex
- AP:
-
Alkaline phosphatase
- DAB:
-
Diaminobenzidine
- FDC:
-
Follicular dendritic cell
- MZ:
-
Marginal zone
- SMA:
-
Smooth muscle alpha actin
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Acknowledgments
We thank Dr. E. W. Herbst, Institute of Pathology, Klinikum Neubrandenburg, D-17022 Neubrandenburg, for contributing several specimens. Katrin Lampp and Anja Seiler provided expert technical assistance. Reiner Westermann, Gerwin Santo and J. Jäkel helped with image processing. Ilse Feisel skilfully drew Fig. 4. This work was supported by grant Ste 360/10-1 of the Deutsche Forschungsgemeinschaft.
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Steiniger, B., Ulfig, N., Riße, M. et al. Fetal and early post-natal development of the human spleen: from primordial arterial B cell lobules to a non-segmented organ. Histochem Cell Biol 128, 205–215 (2007). https://doi.org/10.1007/s00418-007-0296-4
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DOI: https://doi.org/10.1007/s00418-007-0296-4