Total lymphoid irradiation leads to transient depletion of the mouse thymic medulla and persistent abnormalities among medullary stromal cells

Journal Article · Sun May 15 00:00:00 EDT 1988 · J. Immunol.; (United States)

OSTI ID:7067201

Adkins, B; Gandour, D; Strober, S; Weissman, I

Mice given multiple doses of sublethal irradiation to both the thymus and the peripheral lymphoid tissues showed major transient, and some persistent disruptions in general thymic architecture and in thymic stromal components. At 2 wk after total lymphoid irradiation (TLI), the thymus lacked identifiable medullary regions by immunohistochemical analyses. Medullary stromal cells expression MHC Ag or a medullary epithelial cell Ag, as well as medullary macrophages, were undetectable. Instead, the processes of cortical epithelial cells were observed throughout the entire thymus. Strikingly, thymocyte subsets with mature phenotypes (CD4+CD8- and CD4-CD8+) were present in the apparent absence of a medulla. This early, gross effect was rapidly reversed such that by 1 to 2 mo after TLI, medullary areas with MHC Ag-positive cells were evident. However, abnormalities in a subset of medullary stromal cells appeared to be more persistent. Medullary epithelial cells, identified by the MD1 mAb, were greatly reduced in number and abnormally organized for at least 4 mo after TLI. In addition, macrophages containing endogenous peroxidase activity, normally abundant in medullary regions, were undetectable at all times examined after TLI. Therefore, this irradiation regimen induced both transient and long term effects in the thymus, primarily in medullary regions. These results suggest that TLI may be used as an experimental tool for studying the impact of selective depletion of medullary stromal cells on the development of specific T cell functions.

• Research Organization: Stanford Univ. School of Medicine, CA (USA)
• OSTI ID: 7067201
• Journal Information: J. Immunol.; (United States), Vol. 140:10
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
LYMPHATIC SYSTEM
IRRADIATION
THYMUS
BIOLOGICAL RADIATION EFFECTS
EPITHELIUM
FRACTIONATED IRRADIATION
MACROPHAGES
MICE
SUBLETHAL IRRADIATION
THYMOCYTES
ANIMAL CELLS
ANIMAL TISSUES
ANIMALS
BIOLOGICAL EFFECTS
BODY
CONNECTIVE TISSUE CELLS
MAMMALS
ORGANS
PHAGOCYTES
RADIATION EFFECTS
RODENTS
SOMATIC CELLS
TISSUES
VERTEBRATES
560152* - Radiation Effects on Animals- Animals