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• W1872606113 abstract "Pülhorn H, Herrmann M, Harms H, Jung A & Baumann I (2012) Histopathology 61, 200–211 Apoptotic cells and clonally expanded cytotoxic T cells in bone marrow trephines of patients with myelodysplastic syndrome Aims: There is increasing evidence that autoimmunity is involved in the pathogenesis of myelodysplastic syndromes (MDS). We examined the number of apoptotic cells, and analysed the T cells and the T cell receptor gene rearrangements in bone marrow trephines of patients with low-grade MDS [refractory anaemia (RA), refractory anaemia with ringed sideroblasts (RAS) and refractory cytopenia with multilineage dysplasia (RCMD)] to investigate the correlation between T cells and apoptosis. Methods and results: Bone marrow trephines from 30 patients with RA, seven patients with RCMD, four patients with RAS and 11 normal bone marrow donors were stained for CD3 and for apoptotic cells using immunohistochemistry and terminal deoxynucleotidyl transferase 2′-deoxyuridine, 5′-triphosphate (dUTP) nick end labelling (TUNEL) technique, respectively. The positive cells were quantified by computer-assisted image analysis. In addition, CD 8 and T cell-restricted intracellular antigen-1 (TIA-1)-positive cells were analysed by single staining and evaluated semiquantitatively by light microscopy. Junctional diversity of the T cell receptor (TCR) α-, β- and γ-chains were analysed in 24 cases of RA and RCMD by reverse transcription–polymerase chain reaction (RT–PCR). In all cases of RA, RCMD and RAS an increase of apoptotic cells was accompanied by an increase of T cells, when compared to normal donors (P < 0.001). Expression of TIA-1 was found in 33 of 41 patients with low-grade MDS. In contrast, normal controls showed either no or only very weak expression. Furthermore, 14 of 24 cases with low-grade MDS showed clonal TCR gene rearrangement. Conclusion: These findings provide evidence that increased apoptosis in low-grade MDS correlates with increased numbers of cytotoxic T cells. A considerable proportion of the MDS cases showed clonal TCR rearrangement suggesting an antigen-driven selection of the T cells. We therefore speculate that cases of MDS can be accompanied by a presumably autoreactive T cell-mediated apoptosis induction in bone marrow cells." @default.
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• W1872606113 date "2012-06-13" @default.
• W1872606113 modified "2023-09-23" @default.
• W1872606113 title "Apoptotic cells and clonally expanded cytotoxic T cells in bone marrow trephines of patients with myelodysplastic syndrome" @default.
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• W1872606113 doi "https://doi.org/10.1111/j.1365-2559.2012.04209.x" @default.
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