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• W2040751423 abstract "7,8-Disubstituted guanine ribonucleosides represent a class of B lymphocyte agonists that utilize a protein kinase C-independent signaling pathway. These compounds provide an alternate T helper signal for B cells and enhance antigen-specific humoral responses in the murine model and in an IL-2-dependent human model in vitro . They effectively restore high level immune responses in a variety of murine models of immunodeficiency both in vivo and in vitro . In this study we examined the potential of these compounds to improve antibody responses generated by cultured cells from patients with common variable immunodeficiency (CVI). The inability to mount normal humoral responses to antigen was confirmed in nine patients with diagnosed CVI (CVI: 37 ± 16, normal 653 ± 116 plaque-forming cells (PFC/culture; P < 0.001). In cultured lymphocytes from eight of the nine patients studied, a normal level or greater responses to nominal antigen could be elicited by antigen in the presence of the immunostimulatory nucleoside 7-methyl-8-oxoguanosine (7m8oGuo). The average response to antigen increased from 37 ± 16 without nucleoside to 1733 ± 488 PFC/culture in its presence ( P < 0.002). Restoration of specific immune responses was an antigen-dependent and nucleoside dose-dependent event. Signaling by 7m8oGuo rendered the response to antigen protein kinase C independent in cultures of cells from normal donors as well as from CVI patients. These data substantiate (i) that a non-C-kinase signaling pathway for antigen-dependent differentiation exists, (ii) that this pathway can function normally in B cells from patients with CVI when triggered appropriately, and (iii) that 7,8-disubstituted guanine ribonucleosides can convert a C-kinase-dependent signaling event to a C-kinase-independent signaling event. Substituted guanine ribonucleosides may have potential as immunotherapeutic agents for patients with CVI." @default.
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• W2040751423 date "1991-04-01" @default.
• W2040751423 modified "2023-09-26" @default.
• W2040751423 title "Protein kinase C independent restoration of specific immune responsiveness in common variable immunodeficiency" @default.
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• W2040751423 doi "https://doi.org/10.1016/0090-1229(91)90079-p" @default.
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