High glucose concentration impairs ATP outflow and immunoglobulin production by human peripheral B lymphocytes: involvement of P2X7 receptor.

Monika Sakowicz-Burkiewicz, Katarzyna Kocbuch, Marzena Grden, Izabela Maciejewska, Andrzej Szutowicz, Tadeusz Pawelczyk

Department of Molecular Medicine, Medical University of Gdansk, 80-211 Gdansk, Poland.

Immunobiology 2013 Apr

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Patients with diabetes are more prone to bacterial infections mostly due to hyperglycemia-induced suppression of immune cells function. B lymphocytes by secreting antibodies inhibit microbial replication, but the impact of high glucose concentration on humoral immune response is not fully resolved. The aim of this work was to investigate the effect of high glucose concentration on B cells response to stimulation with a bacterial antigen and autocrine regulation. Purified human peripheral blood B cells were cultured at different glucose concentrations and stimulated in vitro with Staphylococcus aureus Cowan I (SAC) plus IL-2. B cells proliferation, differentiation and IgM expression were analyzed by flow cytometry. B cell ATP release and involvement of P2 purinergic receptors in regulation of IgM secr etion was assessed. B cells cultured at 25 mM glucose in response to SAC stimulation released significantly less (≈ 55%) IgM comparing to cells maintained in 5mM glucose. Under resting and stimulatory conditions B cells released significant quantities of ATP to the culture media, but ATP level decreased when B cells were maintain in high glucose. SAC-induced B cell IgM release was totally blocked by highly selective antagonist (Az11645373) of P2X7 receptor. IgM secretion increased in the presence of potent P2X7 receptor agonist (BzATP), but this effect was abolished by high glucose concentration. High glucose concentration impairs B cell function by suppression of P2X7 receptor-dependent IgM release in response to in vitro bacterial antigen stimulation. This alteration may greatly contribute to the impaired humoral immune response in diabetics. Copyright © 2012 Elsevier GmbH. All rights reserved.

Citation

Monika Sakowicz-Burkiewicz, Katarzyna Kocbuch, Marzena Grden, Izabela Maciejewska, Andrzej Szutowicz, Tadeusz Pawelczyk. High glucose concentration impairs ATP outflow and immunoglobulin production by human peripheral B lymphocytes: involvement of P2X7 receptor. Immunobiology. 2013 Apr;218(4):591-601