Dysfunction of irradiated thymus for the development of helper T cells

Journal Article · Wed Jul 15 04:00:00 EDT 1987 · J. Immunol.; (United States)

OSTI ID:6240729

Amagai, T; Kina, T; Hirokawa, K; Nishikawa, S; Imanishi, J; Katsura, Y

The development of cytotoxic T cells and helper T cells in an intact or irradiated thymus was investigated. C57BL/6 (H-2b, Thy-1.2) mice were whole body-irradiated, or were irradiated with shielding over either the thymus or right leg and tail, and were transferred with 1.5 X 10(7) bone marrow cells from B10.Thy-1.1 mice (H-2b, Thy-1.1). At various days after reconstitution, thymus cells from the recipient mice were harvested and a peanut agglutinin low-binding population was isolated. This population was further treated with anti-Thy-1.2 plus complement to remove host-derived cells and was assayed for the frequency of cytotoxic T cell precursors (CTLp) and for the activity of helper T cells (Th). In the thymus of thymus-shielded and irradiated mice, Th activity reached normal control level by day 25, whereas CTLp frequency remained at a very low level during these days. In the thymus of whole body-irradiated mice, generation of CTLp was highly accelerated while that of Th was retarded, the period required for reconstitution being 25 days and more than 42 days for CTLp and Th, respectively. Preferential development of CTLp was also seen in right leg- and tail-shielded (L-T-shielded) and irradiated recipients. Histological observation indicated that Ia+ nonlymphoid cells were well preserved in the thymus of thymus-shielded and irradiated recipients, whereas in L-T-shielded and irradiated recipients, such cells in the medulla were markedly reduced in number. These results suggest strongly that the generation of Th but not CTLp is dependent on radiosensitive thymic component(s), and that such components may represent Ia+ cells themselves in the medulla or some microenvironment related to Ia+ cells.

• Research Organization: Kyoto Prefectural Univ. of Medicine, Japan
• OSTI ID: 6240729
• Journal Information: J. Immunol.; (United States), Journal Name: J. Immunol.; (United States) Vol. 139:2; ISSN JOIMA
• Country of Publication: United States
• Language: English

Related Subjects

560152* -- Radiation Effects on Animals-- Animals
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL CELLS
ANIMALS
ANTIBODY FORMATION
BIOLOGICAL EFFECTS
BIOLOGICAL MATERIALS
BIOLOGICAL RADIATION EFFECTS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
BONE MARROW CELLS
CELL DIFFERENTIATION
COMPLEMENT
CONNECTIVE TISSUE CELLS
EXTERNAL IRRADIATION
IMMUNE REACTIONS
IRRADIATION
LECTINS
LEUKOCYTES
LYMPHATIC SYSTEM
LYMPHOCYTES
MAMMALS
MATERIALS
MICE
ORGANIC COMPOUNDS
ORGANS
PARTIAL BODY IRRADIATION
PRECURSOR
PROTEINS
RADIATION EFFECTS
RODENTS
SOMATIC CELLS
THYMUS
VERTEBRATES
WHOLE-BODY IRRADIATION