Thymic lymphopoiesis: protected from, or influenced by, external stimulation?

Hess, Max W; Mueller, Christoph; Schaffner, Thomas; Gerber, Heinz A; Eggli, Peter; Cottier, Hans (1985). Thymic lymphopoiesis: protected from, or influenced by, external stimulation? Annals of the New York Academy of Sciences, 459(1), pp. 14-21. New York Academy of Sciences 10.1111/j.1749-6632.1985.tb20811.x

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The mechanisms regulating thymic lymphopoiesis are still a matter of debate. Intracortical proliferation and differentiation of thymocytes are thought to be controlled by locally produced humoral factors and close contact with epithelial, possibly also phagocytic, cells, and restricted by products of the major histocompatibility complex. The observation of a translocation of intraabdominally introduced PVP-coated silica particles (Percoll) via parathymic lymph vessels and through the thymic capsule into the cortical parenchyma demonstrates that the thymic cortex is accessible to materials carried with the transcapsular flux of interstitial fluid, and that this barrier is less effective than the blood-thymus barrier. The proliferative activity of cortical thymocytes following an intraabdominal injection of particulate tetanus toxoid was compared in sites adjacent to, and distant from, parathymic lymph nodes. Absolute numbers of DNA-synthesizing thymocytes were found to be much higher in cortical areas close to the lymph nodes, where lymphatic vessels are most numerous, than on the opposite sides of the thymic lobes. Taken together, these findings indicate that--in addition to intrinsic control mechanisms--cortical thymocyte production may be influenced by peripheral stimulation to some extent, and that materials from sites which are drained by parathymic lymph nodes may be important in this respect.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy
04 Faculty of Medicine > Service Sector > Institute of Pathology
04 Faculty of Medicine > Service Sector > Institute of Pathology > Immunopathology

UniBE Contributor:

Müller, Christoph; Schaffner, Thomas and Eggli, Peter Slade

Subjects:

600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology

ISSN:

1749-6632

Publisher:

New York Academy of Sciences

Language:

English

Submitter:

Christoph Müller

Date Deposited:

19 Sep 2022 08:12

Last Modified:

19 Sep 2022 08:22

Publisher DOI:

10.1111/j.1749-6632.1985.tb20811.x

PubMed ID:

3868315

BORIS DOI:

10.48350/172914

URI:

https://boris.unibe.ch/id/eprint/172914

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