Intrathymic T cell differentiation in radiation bone marrow chimeras and its role in T cell emigration to the spleen. An immunohistochemical study
Immunohistochemical studies were made on the regeneration of T cells of host- and donor-type in the thymus and spleen of radiation bone marrow chimeras by using B10- and B10.BR-Thy-1 congenic mice. In Thy-1 congenic chimeras, thymocytes of donor bone marrow origin, were first recognized at day 7, when the thymus involuted to the smallest size after the irradiation. The thymocytes of donor-type then proliferated exponentially, showing a slightly faster rate when higher doses of bone marrow cells were used for reconstitution, reaching a level of 100 million by day 17 and completely replacing the cortical thymocytes of host origin by day 21. The replacement of medullary thymocytes from host- to donor-type occurred gradually between days 21 and 35, after the replacement in the cortex was completed. In the spleen, about 1 million survived cells were recovered at day 3 after the irradiation, and approximately 60% of them were shown to be host-type T cells that were observed in the white pulp areas. The host-type T cells in the spleen increased gradually after day 10, due to the influx of host-type T cells from the regenerating thymus. Thus a pronounced increase of T cells of host-type was immunohistochemically observed in the splenic white pulp between days 21 and 28, when thymocytes of host-type were present mainly in the thymic medulla. These host-type T cells were shown to persist in the spleen for a long time, as long as 420 days after the treatment. Phenotypically, they were predominantly Lyt-1+2+ when examined at day 28, but 5 mo later, they were about 50% Lyt-1+2+ and 50% Lyt-1+2-.
- Research Organization:
- Tokyo Metropolitan Institute of Gerontology, Japan
- OSTI ID:
- 5019290
- Journal Information:
- J. Immunol.; (United States), Vol. 6
- Country of Publication:
- United States
- Language:
- English
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LYMPHOCYTES
CELL DIFFERENTIATION
RADIATION CHIMERAS
IMMUNOLOGY
BONE MARROW
MICE
SPLEEN
THYMECTOMY
THYMOCYTES
THYMUS
ANIMAL CELLS
ANIMAL TISSUES
ANIMALS
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
CHIMERAS
CONNECTIVE TISSUE CELLS
HEMATOPOIETIC SYSTEM
LEUKOCYTES
LYMPHATIC SYSTEM
MAMMALS
MATERIALS
MEDICINE
MOSAICISM
ORGANS
RODENTS
SOMATIC CELLS
SURGERY
TISSUES
VERTEBRATES
560152* - Radiation Effects on Animals- Animals