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Sampol J, Dussol B, Fenouillet E, Capo C, Mege JL, Halimi G, Bechis G, Brunet P, Rochat H, Berland Y, Guieu R. High adenosine and deoxyadenosine concentrations in mononuclear cells of hemodialyzed patients. J Am Soc Nephrol 2001; 12:1721-1728. [PMID: 11461945 DOI: 10.1681/asn.v1281721] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Infections are one of the most important complications of hemodialysis (HD). The high concentrations of adenosine (Ado) and of its metabolites during HD may contribute to the dialysis-induced immune deficiency through their known ability to alter lymphocyte function. The influence of HD on Ado metabolism was assessed in mononuclear cells through the measurement of (1) the concentrations of nucleosides in mononuclear cells and (2) the activities of mononuclear cell Ado deaminase (MCADA) and Ado kinase, two enzymes involved in Ado concentration regulation. Nine end-stage renal failure hemodialyzed patients (five men and four women; mean age, 69 +/- 10 yr) and eight healthy volunteers (four men and four women; mean age, 53 +/- 19 yr) were included in the study. Before HD, Ado, deoxyadenosine, and inosine concentrations were respectively 2.9-, 2.5-, and 2.5-fold higher in mononuclear cells of patients than in healthy volunteers. During HD, Ado concentration decreased by 34%, whereas inosine concentration increased by 27%. Before HD, MCADA activity level was 2.1-fold lower in patients than in control subjects. After HD, MCADA activity increased by nearly 50% but remained lower than in control subjects. Ado kinase activity level of patients did not differ from that of control subjects and was unchanged by HD. The influence of Ado on in vitro mononuclear cell proliferation and interferon-gamma production also was evaluated. Ado inhibited cell proliferation and interferon-gamma production in a dose-dependent manner, and these inhibitions were stronger for patients than for healthy volunteers. The high concentrations of Ado and deoxyadenosine in mononuclear cells and the low MCADA activity level likely are involved in the immune defect of patients who are undergoing HD.
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Affiliation(s)
- Jerome Sampol
- UMR CNRS 6560, Faculté de Médecine Secteur Nord, Marseille, France
- Service de Néphrologie, Hôpital Sainte Marguerite, Marseille, France
| | - Bertrand Dussol
- Service de Néphrologie, Hôpital Sainte Marguerite, Marseille, France
- Centre d'Investigation Clinique, Hôpital Sainte Marguerite, Marseille, France
| | | | - Christian Capo
- CNRS UPRESA 6020 Unité des Rickettsies, Marseille, France
| | | | - Gilles Halimi
- UMR CNRS 6560, Faculté de Médecine Secteur Nord, Marseille, France
| | - Guy Bechis
- UMR CNRS 6560, Faculté de Médecine Secteur Nord, Marseille, France
| | - Philippe Brunet
- Service de Néphrologie, Hôpital Sainte Marguerite, Marseille, France
- Centre d'Investigation Clinique, Hôpital Sainte Marguerite, Marseille, France
| | - Herve Rochat
- Service de Néphrologie, Hôpital Sainte Marguerite, Marseille, France
- Centre d'Investigation Clinique, Hôpital Sainte Marguerite, Marseille, France
| | - Yvon Berland
- Service de Néphrologie, Hôpital Sainte Marguerite, Marseille, France
- Centre d'Investigation Clinique, Hôpital Sainte Marguerite, Marseille, France
| | - Regis Guieu
- UMR CNRS 6560, Faculté de Médecine Secteur Nord, Marseille, France
- Laboratoire de Biochimie, Hôpital de la Timone, Marseille, France
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Begleiter A, Verburg L, Israels LG, Johnston JB. Factors influencing the inhibition of repair of irradiation-induced DNA damage by 2'-deoxycoformycin and deoxyadenosine. Cancer Chemother Pharmacol 1992; 30:65-9. [PMID: 1586982 DOI: 10.1007/bf00686487] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Permeabilized L5178Y cells were used to investigate the mechanism underlying inhibition of the repair of irradiation-induced DNA strand breaks by 2'-deoxycoformycin combined with deoxyadenosine. Permeabilized cells repaired DNA strand breaks as effectively as did intact cells, and at deoxyadenosine concentrations that produced similar levels of deoxyadenosine triphosphate (dATP), repair of DNA strand breaks was inhibited by 2'-deoxycoformycin plus deoxyadenosine to a comparable extent in both types of cells. Accompanying the increase in intracellular dATP produced by 2'-deoxycoformycin combined with deoxyadenosine was a fall in levels of deoxythymidine triphosphate (dTTP), deoxyguanosine triphosphate (dGTP), and deoxycytidine triphosphate (dCTP). The addition of dTTP, dGTP, and dCTP reversed the inhibition of DNA repair by 2'-deoxycoformycin plus deoxyadenosine, although the level of dATP was not affected. Reducing the phosphorylation of deoxy-adenosine to dATP by the addition of adenosine prevented the decrease in levels of dTTP, dGTP, and dCTP and the inhibition of DNA repair by 2'-deoxycoformycin and deoxyadenosine. In contrast, increasing the intracellular levels of dATP by the addition of 2'-deoxycoformycin together with dATP, deoxyadenosine diphosphate (dADP), or deoxyadenosine monophosphate (dAMP) had no effect on the levels of the other deoxynucleotide triphosphates and did not inhibit DNA repair. Moreover, DNA repair was not inhibited by the breakdown products of deoxyadenosine, adenine, or deoxyribose. These results suggest that inhibition of the repair of irradiation-induced DNA strand breaks by 2'-deoxycoformycin combined with deoxyadenosine requires the phosphorylation of deoxyadenosine and involves alterations in the levels of deoxynucleotide triphosphates.
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Affiliation(s)
- A Begleiter
- Department of Internal Medicine, University of Manitoba, Winnipeg, Canada
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Buc HA, Moncion A, Hamet M, Houllier AM, Thuilier L, Perignon JL. Influence of adenosine deaminase inhibition on the phosphoinositide turnover in the initial stages of human T cell activation. Eur J Immunol 1990; 20:611-5. [PMID: 2156710 DOI: 10.1002/eji.1830200322] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
An experimental model of adenosine deaminase deficiency was established on the human T cell line Jurkat by using 2'-deoxycoformycin, a strong specific inhibitor of the enzyme. When deoxyadenosine was added to the inhibited cells, the nucleotide profile was modified reproducing that found in lymphocytes from adenosine deaminase-deficient children. The metabolism of phosphoinositides, analyzed by either the release of [3H]inositol phosphates or the breakdown of 32P-prelabeled phosphatidyl inositides, was compared in normal and modified cells where dATP was accumulated. No modification in 32P labeling of phosphoinositides was detectable within the 32P-loading period. However, when the cells were stimulated by phytohemagglutinin or anti-CD3 monoclonal antibody, the phosphoinositide hydrolysis was strongly reduced in the dATP-containing lymphoblasts. This decrease was correlated with the intracellular dATP concentration.
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Affiliation(s)
- H A Buc
- Faculté de Médecine, Necker-Enfants Malades, INSERM U75, Paris, France
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