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MHC-linked colonization of the thymus and thymocyte development: effects of mature T lymphocytes.

Abstract：

:Effects of mature T lymphocytes on thymic colonization by lymphohemopoietic cells were investigated in an in vitro experimental model, using a variety of experimental strategies. Lymphoid-depleted fetal thymus (FT) explants (C57BL/Ka, Thy1.1, H-2b) were incubated with bone marrow (BM) cells from syngeneic (C57BL/Ka; SBM) and allogeneic (BALB/c, Thy1.2, H-2d; ABM) donors. Cocultures of FT with SBM and ABM, depleted of Thy1+ or of CD3+ cells, resulted in equal proportions of lymphocytes from both BM donors. When peripheral blood lymphocytes (PBL) from synegenic or semi-allogeneic donors (F1[C57BL/Ka x C57BL/6J], Thy1.1/Thy1.2); or F1[C57BL/Ka x BALB/c], Thy1.1/Thy1.2, respectively) were added to these cultures, the total lymphocyte count per thymic lobe decreased and a developmental preference of the SBM-derived cells, as compared to the ABM-derived cells, was noted. Cells of the PBL types were also observed in the cultures. Cocultures of FT with ABM and PBL showed reduced proportions of ABM-derived cells and occurrence of cells of the PBL type. Finally, FT explants partially depleted of lymphocytes by irradiation (6 Gy), were cocultured with PBL from either syngeneic or allogeneic donors. In the presence of syngeneic PBL, the total number of cells and the proportion of double-positive (CD4+CD8+) T cells were similar to those in the FT cultured by itself, whereas in the presence of allogeneic PBL these values were reduced. The study suggests that mature T lymphocytes may play a role in the developmental processes in the thymus, and points to MHC-linked selective effects.

journal_name

Int Arch Allergy Immunol

journal_title

International archives of allergy and immunology

authors

Sharp A,Fridkis-Hareli M,Eren R,Kukulansky T,Abel L,Globerson A

doi

10.1159/000236884

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

13-9

issue

1

eissn

1018-2438

issn

1423-0097

journal_volume

106

pub_type

杂志文章

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