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Apoptosis and oxidative status in peripheral blood mononuclear cells of diabetic patients

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Abstract

We have compared the concentrations of intracellular glutathione (GSH), glutathione-dependent antioxidative enzymes, the cell death rate and immunophenotype profile of peripheral blood mononuclear cells (PBMC) from healthy donors and from patients with insulin-dependent type I (IDDM) or non insulin-dependent type II (NIDDM) diabetes mellitus. The IDDM and NIDDM patients had above-normal absolute lymphocyte counts, whereas the percentages of CD3, CD4 and CD8 T lymphocytes were significantly reduced. In contrast, the absolute number and percentage of B lymphocytes was higher in diabetic patients than in healthy donors. The low intracellular reduced glutathione (GSH) and the unbalanced profile of key enzymes involved in GSH metabolism, gamma glutamyltransferase (γ-GT) and glutathione-S-transferase (GST), account for the increased oxidative status of PBMC from diabetic patients. The plasma membranes of PBMC from diabetic patients were less permeable to propidium iodide than those of PBMC from healthy donors, indicating that the apoptotic cell death rate was lower in the cells from diabetic patients. These differences are potentially useful markers of pathogenic metabolic changes which occur during clinical diabetes and if they are confirmed could be used to identify the onset of diabetes.

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Authors and Affiliations

  1. Laboratorio di Patologia Cellulare, Istituto Cantonale di Patologia, CH-6601, Locarno, Switzerland

    R. Graber & G. A. Losa

  2. OM Pharma S.A., CH-1217, Meyrin, Switzerland

    J. C. Farine

  3. Medical Practice, CH-6601, Locarno, Switzerland

    I. Fumagalli & V. Tatti

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  1. R. Graber
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  2. J. C. Farine
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  3. I. Fumagalli
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  4. V. Tatti
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  5. G. A. Losa
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Graber, R., Farine, J.C., Fumagalli, I. et al. Apoptosis and oxidative status in peripheral blood mononuclear cells of diabetic patients. Apoptosis 4, 263–270 (1999). https://doi.org/10.1023/A:1026408409916

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