scholarly journals T Cell Production of GM-CSF Protects the Host during Experimental Tuberculosis

mBio ◽  
2017 ◽  
Vol 8 (6) ◽  
Author(s):  
Richard T. Robinson
Keyword(s):  
T Cells ◽  
T Cell ◽  
Experimental Models ◽  
T Cell Subsets ◽  
Experimental Tuberculosis ◽  
Gm Csf ◽  
Macrophage Colony Stimulating Factor ◽  
Mechanistic Basis ◽  
Macrophage Colony ◽  
Stimulating Factor

ABSTRACT Although classically associated with myelopoiesis, granulocyte-macrophage colony-stimulating factor (GM-CSF) is increasingly recognized as being important for tuberculosis (TB) resistance. GM-CSF is expressed by nonhematopoietic and hematopoietic lineages following infection with Mycobacterium tuberculosis and is necessary to restrict M. tuberculosis growth in experimental models. Until the recent study by Rothchild et al. (mBio 8:e01514-17, 2017, https://doi.org/10.1128/mBio.01514-17 !), it was unknown whether GM-CSF-producing T cells contribute to TB resistance. Rothchild et al. identify which conventional and nonconventional T cell subsets produce GM-CSF during experimental TB, establish their protective nature using a variety of approaches, and provide a mechanistic basis for their ability to restrict M. tuberculosis growth. This commentary discusses the significance of these findings to basic and applied TB research. As translated to human disease, these findings suggest vaccine-mediated expansion of GM-CSF-producing T cells could be an effective prophylactic or therapeutic TB strategy.

scholarly journals NF-kappa B as inducible transcriptional activator of the granulocyte-macrophage colony-stimulating factor gene.

1990 ◽  
Vol 10 (3) ◽  
pp. 1281-1286 ◽  
Author(s):  
R Schreck ◽  
P A Baeuerle
Keyword(s):  
T Cells ◽  
Transcription Factor ◽  
T Cell ◽  
Interleukin 2 ◽  
Colony Stimulating Factor ◽  
Nf Kappa B ◽  
Gm Csf ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

The expression of the gene encoding the granulocyte-macrophage colony-stimulating factor (GM-CSF) is induced upon activation of T cells with phytohemagglutinin and active phorbolester and upon expression of tax1, a transactivating protein of the human T-cell leukemia virus type I. The same agents induce transcription from the interleukin-2 receptor alpha-chain and interleukin-2 genes, depending on promoter elements that bind the inducible transcription factor NF-kappa B (or an NF-kappa B-like factor). We therefore tested the possibility that the GM-CSF gene is also regulated by a cognate motif for the NF-kappa B transcription factor. A recent functional analysis by Miyatake et al. (S. Miyatake, M. Seiki, M. Yoshida, and K. Arai, Mol. Cell. Biol. 8:5581-5587, 1988) described a short promoter region in the GM-CSF gene that conferred strong inducibility by T-cell-activating signals and tax1, but no NF-kappa B-binding motifs were identified. Using electrophoretic mobility shift assays, we showed binding of purified human NF-kappa B and of the NF-kappa B activated in Jurkat T cells to an oligonucleotide comprising the GM-CSF promoter element responsible for mediating responsiveness to T-cell-activating signals and tax1. As shown by a methylation interference analysis and oligonucleotide competition experiments, purified NF-kappa B binds at positions -82 to -91 (GGGAACTACC) of the GM-CSF promoter sequence with an affinity similar to that with which it binds to the biologically functional kappa B motif in the beta interferon promoter (GGGAAATTCC). Two kappa B-like motifs at positions -98 to -108 of the GM-CSF promoter were also recognized but with much lower affinities. Our data provide strong evidence that the expression of the GM-CSF gene following T-cell activation is controlled by binding of the NF-kappa B transcription factor to a high-affinity binding site in the GM-CSF promoter.

scholarly journals Granulocyte-macrophage colony-stimulating factor augmentation of T-cell receptor-dependent and T-cell receptor-independent thymocyte proliferation

Blood ◽  
1994 ◽  
Vol 83 (3) ◽  
pp. 713-723
Author(s):  
AM Stewart-Akers ◽  
JS Cairns ◽  
DJ Tweardy ◽  
SA McCarthy
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Cell Receptor ◽  
Cell Receptor ◽  
Colony Stimulating Factor ◽  
Gm Csf ◽  
Thymocyte Proliferation ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

The effects of granulocyte-macrophage colony-stimulating factor (GM- CSF) are not confined to cells of the myeloid lineage. GM-CSF has been shown to have effects on mature T cells and both mature and immature T- cell lines. We therefore examined the GM-CSF responsiveness of murine thymocytes to investigate whether GM-CSF also affected normal immature T lymphocytes. The studies presented here indicate that GM-CSF augments accessory cell (AC)-dependent T-cell receptor (TCR)-mediated proliferation of unseparated thymocyte populations. To identify the GM- CSF responsive cell type, thymic AC and T cells were examined for GM- CSF responsiveness. We found that GM-CSF augmentation of TCR-induced thymocyte proliferation appears to be mediated via augmentation of AC function, and not via direct effects on mature single-positive (SP) thymocytes. Enriched double-negative (DN) thymocytes were also tested for GM-CSF responsiveness. GM-CSF induced the proliferation of adult and fetal DN thymocytes in an AC-independent and TCR-independent single- cell assay. Thus, in contrast to the SP thymocytes, a DN thymocyte population was directly responsive to GM-CSF. GM-CSF therefore may play a direct role in the expansion of DN thymocytes and an indirect role in the expansion of SP thymocytes.

scholarly journals Priming effects of granulocyte-macrophage colony-stimulating factor are coupled to cholera toxin-sensitive guanine nucleotide binding protein in human T lymphocytes

Blood ◽  
1994 ◽  
Vol 83 (5) ◽  
pp. 1299-1309
Author(s):  
A al-Aoukaty ◽  
A Giaid ◽  
C Sinoff ◽  
AD Ho ◽  
AA Maghazachi
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Lymphocytes ◽  
G Protein ◽  
T Cell Proliferation ◽  
Gm Csf ◽  
Human T Cells ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

In addition to the mobilization of neutrophils and monocytes, granulocyte-macrophage colony-stimulating factor (GM-CSF) also mobilizes lymphocytes into peripheral blood. We examined the ability of GM-CSF to induce the proliferation of purified human T cells (CD3+ CD4+ CD56- CD16- B1- MO2-) in two major aspects: (1) the mechanisms of GM- CSF interaction with interleukin-2 (IL-2) causing T-cell proliferation, and (2) the intracellular signals transmitted by GM-CSF in T lymphocytes. We observed that concentrations of GM-CSF between 0.01 ng/mL and 10 ng/mL had a synergistic effect with concentrations of IL-2 between 1 U/mL and 10 U/mL in stimulating T-cell proliferation. This effect of GM-CSF was maximal when it was added at the start of the culture. In situ hybridization showed the presence of mRNA for GM-CSF receptors in T cells. Further analysis showed that GM-CSF induced the expression of IL-2 receptor (IL-2R) on the surface of T lymphocytes. These events coincide with the ability of GM-CSF to increase the intracellular levels of both cyclic 3′,5′-adenosine monophosphate (cAMP) and cyclic 3′,5′-guanosine monophosphate (cGMP) in T cells, to increase the binding of (gamma-35S) GTP to T-cell membranes, and to enhance GTPase activity as determined by increased hydrolysis of 32P- GTP. IL-2 also induced IL-2R expression, cyclic nucleotide secretion, and G-protein activation. However, the presence of IL-2 reduced GM-CSF induction of these activities. Addition of antibodies to the alpha and beta subunits of IL-2R permitted the activation of G protein by GM-CSF even when IL-2 was present. Furthermore, GTP binding and GTPase activity induced by GM-CSF or IL-2 were inhibited by the addition of cholera toxin (CT), but not pertussis toxin (PT). Cumulatively, these results suggest that in T lymphocytes, receptors for GM-CSF or IL-2 may be coupled to the same CT-sensitive G protein, although other possibilities may exist. The role that G proteins play in mediating the intracellular signaling pathways induced by GM-CSF or IL-2 in human T cells is supported by adenosine diphosphate-ribosylation of a 44-kD or a 39-kD G protein in T-cell membranes by CT and PT, respectively.

The granulocyte-macrophage colony-stimulating factor promoter cis-acting element CLE0 mediates induction signals in T cells and is recognized by factors related to AP1 and NFAT

1993 ◽  
Vol 13 (12) ◽  
pp. 7399-7407
Author(s):  
E S Masuda ◽  
H Tokumitsu ◽  
A Tsuboi ◽  
J Shlomai ◽  
P Hung ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Phorbol Myristate Acetate ◽  
Colony Stimulating Factor ◽  
Myristate Acetate ◽  
Cis Acting ◽  
Gm Csf ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

Expression of the granulocyte-macrophage colony-stimulating factor (GM-CSF) gene in T cells is activated by the combination of phorbol ester (phorbol myristate acetate) and calcium ionophore (A23187), which mimic antigen stimulation through the T-cell receptor. We have previously shown that a fragment containing bp -95 to +27 of the mouse GM-CSF promoter can confer inducibility to reporter genes in the human Jurkat T-cell line. Here we use an in vitro transcription system to demonstrate that a cis-acting element (positions -54 to -40), referred to as CLE0, is a target for the induction signals. We observed induction with templates containing intact CLE0 but not with templates with deleted or mutated CLE0. We also observed that two distinct signals were required for the stimulation through CLE0, since only extracts from cells treated with both phorbol myristate acetate and A23187 supported optimal induction. Stimulation probably was mediated by CLE0-binding proteins because depletion of these proteins specifically reduced GM-CSF transcription. One of the binding factors possessed biochemical and immunological features identical to those of the transcription factor AP1. Another factor resembled the T-cell-specific factor NFAT. The characteristics of these two factors are consistent with their involvement in GM-CSF induction. The presence of CLE0-like elements in the promoters of interleukin-3 (IL-3), IL-4, IL-5, GM-CSF, and NFAT sites in the IL-2 promoter suggests that the factors we detected, or related factors that recognize these sites, may account for the coordinate induction of these genes during T-cell activation.

scholarly journals Idiotype Immunization Combined With Granulocyte-Macrophage Colony-Stimulating Factor in Myeloma Patients Induced Type I, Major Histocompatibility Complex–Restricted, CD8- and CD4-Specific T-Cell Responses

Blood ◽  
1998 ◽  
Vol 91 (7) ◽  
pp. 2459-2466 ◽  
Author(s):  
Anders Österborg ◽  
Qing Yi ◽  
Lotta Henriksson ◽  
Jan Fagerberg ◽  
Susanne Bergenbrant ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Cell Response ◽  
Type I ◽  
Gm Csf ◽  
Histocompatibility Complex ◽  
Macrophage Colony Stimulating Factor ◽  
Ifn Γ ◽  
Macrophage Colony ◽  
Stimulating Factor

Idiotypic structures expressed on the myeloma Ig protein might be regarded as a tumor-specific antigen. Five patients with IgG myeloma were immunized with the purified serum M-component by repeated intradermal injections together with soluble granulocyte-macrophage colony-stimulating factor (GM-CSF). All patients developed an idiotype (Id)-specific T-cell immunity, defined as blood T cells predominantly secreting interferon-γ (IFN-γ) and interleukin-2 (IL-2) (type I cells). Id-specific DNA synthesis was induced in one patient. Delayed-type hypersensitivity against the Id was not evoked. The specific IFN-γ/IL-2 T-cell response was inhibited (46% to 100%) by a major histocompatibility complex (MHC) class I monoclonal antibody (MoAb) in all five patients. A 5% to 37% inhibition by an MHC class II MoAb was seen in four patients. CD4+ as well as CD8+ T cells enriched by magnetic microbeads contained Id-specific cells. The T cells recognized peptides corresponding to the complementarity-determining regions 1, 2, and 3 of the heavy chain of the Id. There was a transient rise of B cells producing IgM anti-idiotypic antibodies in all patients. The results indicate that immunization of myeloma patients using the autologous M-component and soluble GM-CSF may evoke an Id-specific predominantly MHC class I–restricted type I T-cell response.

scholarly journals Idiotype Immunization Combined With Granulocyte-Macrophage Colony-Stimulating Factor in Myeloma Patients Induced Type I, Major Histocompatibility Complex–Restricted, CD8- and CD4-Specific T-Cell Responses

Blood ◽  
1998 ◽  
Vol 91 (7) ◽  
pp. 2459-2466 ◽  
Author(s):  
Anders Österborg ◽  
Qing Yi ◽  
Lotta Henriksson ◽  
Jan Fagerberg ◽  
Susanne Bergenbrant ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Cell Response ◽  
Type I ◽  
Gm Csf ◽  
Histocompatibility Complex ◽  
Macrophage Colony Stimulating Factor ◽  
Ifn Γ ◽  
Macrophage Colony ◽  
Stimulating Factor

Abstract Idiotypic structures expressed on the myeloma Ig protein might be regarded as a tumor-specific antigen. Five patients with IgG myeloma were immunized with the purified serum M-component by repeated intradermal injections together with soluble granulocyte-macrophage colony-stimulating factor (GM-CSF). All patients developed an idiotype (Id)-specific T-cell immunity, defined as blood T cells predominantly secreting interferon-γ (IFN-γ) and interleukin-2 (IL-2) (type I cells). Id-specific DNA synthesis was induced in one patient. Delayed-type hypersensitivity against the Id was not evoked. The specific IFN-γ/IL-2 T-cell response was inhibited (46% to 100%) by a major histocompatibility complex (MHC) class I monoclonal antibody (MoAb) in all five patients. A 5% to 37% inhibition by an MHC class II MoAb was seen in four patients. CD4+ as well as CD8+ T cells enriched by magnetic microbeads contained Id-specific cells. The T cells recognized peptides corresponding to the complementarity-determining regions 1, 2, and 3 of the heavy chain of the Id. There was a transient rise of B cells producing IgM anti-idiotypic antibodies in all patients. The results indicate that immunization of myeloma patients using the autologous M-component and soluble GM-CSF may evoke an Id-specific predominantly MHC class I–restricted type I T-cell response.

scholarly journals Priming effects of granulocyte-macrophage colony-stimulating factor are coupled to cholera toxin-sensitive guanine nucleotide binding protein in human T lymphocytes

Blood ◽  
1994 ◽  
Vol 83 (5) ◽  
pp. 1299-1309 ◽  
Author(s):  
A al-Aoukaty ◽  
A Giaid ◽  
C Sinoff ◽  
AD Ho ◽  
AA Maghazachi
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Lymphocytes ◽  
G Protein ◽  
T Cell Proliferation ◽  
Gm Csf ◽  
Human T Cells ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

Abstract In addition to the mobilization of neutrophils and monocytes, granulocyte-macrophage colony-stimulating factor (GM-CSF) also mobilizes lymphocytes into peripheral blood. We examined the ability of GM-CSF to induce the proliferation of purified human T cells (CD3+ CD4+ CD56- CD16- B1- MO2-) in two major aspects: (1) the mechanisms of GM- CSF interaction with interleukin-2 (IL-2) causing T-cell proliferation, and (2) the intracellular signals transmitted by GM-CSF in T lymphocytes. We observed that concentrations of GM-CSF between 0.01 ng/mL and 10 ng/mL had a synergistic effect with concentrations of IL-2 between 1 U/mL and 10 U/mL in stimulating T-cell proliferation. This effect of GM-CSF was maximal when it was added at the start of the culture. In situ hybridization showed the presence of mRNA for GM-CSF receptors in T cells. Further analysis showed that GM-CSF induced the expression of IL-2 receptor (IL-2R) on the surface of T lymphocytes. These events coincide with the ability of GM-CSF to increase the intracellular levels of both cyclic 3′,5′-adenosine monophosphate (cAMP) and cyclic 3′,5′-guanosine monophosphate (cGMP) in T cells, to increase the binding of (gamma-35S) GTP to T-cell membranes, and to enhance GTPase activity as determined by increased hydrolysis of 32P- GTP. IL-2 also induced IL-2R expression, cyclic nucleotide secretion, and G-protein activation. However, the presence of IL-2 reduced GM-CSF induction of these activities. Addition of antibodies to the alpha and beta subunits of IL-2R permitted the activation of G protein by GM-CSF even when IL-2 was present. Furthermore, GTP binding and GTPase activity induced by GM-CSF or IL-2 were inhibited by the addition of cholera toxin (CT), but not pertussis toxin (PT). Cumulatively, these results suggest that in T lymphocytes, receptors for GM-CSF or IL-2 may be coupled to the same CT-sensitive G protein, although other possibilities may exist. The role that G proteins play in mediating the intracellular signaling pathways induced by GM-CSF or IL-2 in human T cells is supported by adenosine diphosphate-ribosylation of a 44-kD or a 39-kD G protein in T-cell membranes by CT and PT, respectively.

scholarly journals The granulocyte-macrophage colony-stimulating factor promoter cis-acting element CLE0 mediates induction signals in T cells and is recognized by factors related to AP1 and NFAT.

1993 ◽  
Vol 13 (12) ◽  
pp. 7399-7407 ◽  
Author(s):  
E S Masuda ◽  
H Tokumitsu ◽  
A Tsuboi ◽  
J Shlomai ◽  
P Hung ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Phorbol Myristate Acetate ◽  
Colony Stimulating Factor ◽  
Myristate Acetate ◽  
Cis Acting ◽  
Gm Csf ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

Expression of the granulocyte-macrophage colony-stimulating factor (GM-CSF) gene in T cells is activated by the combination of phorbol ester (phorbol myristate acetate) and calcium ionophore (A23187), which mimic antigen stimulation through the T-cell receptor. We have previously shown that a fragment containing bp -95 to +27 of the mouse GM-CSF promoter can confer inducibility to reporter genes in the human Jurkat T-cell line. Here we use an in vitro transcription system to demonstrate that a cis-acting element (positions -54 to -40), referred to as CLE0, is a target for the induction signals. We observed induction with templates containing intact CLE0 but not with templates with deleted or mutated CLE0. We also observed that two distinct signals were required for the stimulation through CLE0, since only extracts from cells treated with both phorbol myristate acetate and A23187 supported optimal induction. Stimulation probably was mediated by CLE0-binding proteins because depletion of these proteins specifically reduced GM-CSF transcription. One of the binding factors possessed biochemical and immunological features identical to those of the transcription factor AP1. Another factor resembled the T-cell-specific factor NFAT. The characteristics of these two factors are consistent with their involvement in GM-CSF induction. The presence of CLE0-like elements in the promoters of interleukin-3 (IL-3), IL-4, IL-5, GM-CSF, and NFAT sites in the IL-2 promoter suggests that the factors we detected, or related factors that recognize these sites, may account for the coordinate induction of these genes during T-cell activation.

scholarly journals Granulocyte-macrophage colony-stimulating factor augmentation of T-cell receptor-dependent and T-cell receptor-independent thymocyte proliferation

Blood ◽  
1994 ◽  
Vol 83 (3) ◽  
pp. 713-723 ◽  
Author(s):  
AM Stewart-Akers ◽  
JS Cairns ◽  
DJ Tweardy ◽  
SA McCarthy
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Cell Receptor ◽  
Cell Receptor ◽  
Colony Stimulating Factor ◽  
Gm Csf ◽  
Thymocyte Proliferation ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

Abstract The effects of granulocyte-macrophage colony-stimulating factor (GM- CSF) are not confined to cells of the myeloid lineage. GM-CSF has been shown to have effects on mature T cells and both mature and immature T- cell lines. We therefore examined the GM-CSF responsiveness of murine thymocytes to investigate whether GM-CSF also affected normal immature T lymphocytes. The studies presented here indicate that GM-CSF augments accessory cell (AC)-dependent T-cell receptor (TCR)-mediated proliferation of unseparated thymocyte populations. To identify the GM- CSF responsive cell type, thymic AC and T cells were examined for GM- CSF responsiveness. We found that GM-CSF augmentation of TCR-induced thymocyte proliferation appears to be mediated via augmentation of AC function, and not via direct effects on mature single-positive (SP) thymocytes. Enriched double-negative (DN) thymocytes were also tested for GM-CSF responsiveness. GM-CSF induced the proliferation of adult and fetal DN thymocytes in an AC-independent and TCR-independent single- cell assay. Thus, in contrast to the SP thymocytes, a DN thymocyte population was directly responsive to GM-CSF. GM-CSF therefore may play a direct role in the expansion of DN thymocytes and an indirect role in the expansion of SP thymocytes.

scholarly journals Direct effect of granulocyte-macrophage colony-stimulating factor (GM-CSF) on functional features of human T-lymphocytes

2018 ◽  
pp. 37-42
Author(s):  
Н.Д. Газатова ◽  
В.В. Малащенко ◽  
М.Е. Меняйло ◽  
В.А. Шмаров ◽  
О.Б. Мелащенко ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Lymphocytes ◽  
Interleukin 2 ◽  
Direct Effects ◽  
Colony Stimulating Factor ◽  
Gm Csf ◽  
Macrophage Colony Stimulating Factor ◽  
Macrophage Colony ◽  
Stimulating Factor

Актуальность. Исследовали прямые эффекты гранулоцит-макрофагального колониестимулирующего фактора (GM-CSF) человека на функциональную активность субпопуляций T-лимфоцитов. Методы. CD3 Т-лимфоциты были выделены из крови здоровых доноров методом позитивной магнитной сепарации. T-клетки активировали частицами, конъюгированными с антителами (АТ) к молекулам CD3, СD28 и СD2 человека. Мембранную экспрессию CD3, СD4, СD45RA, СD197, CD25 и CD38 оценивали методом проточной цитофлюорометрии. Содержание интерферона-g (interferon-g, IFN-g), интерлейкина-2 (interleukin-2, IL-2). IL-4 и IL-10 в культуральных супернатантах определяли иммуноферментным методом. Результаты. Установлено, что GM-CSF в диапазоне концентраций 0,01-10,0 нг/мл не оказывал существенного влияния на содержание CD25 клеток, среди активированных Т-лимфоцитов. Вместе с тем, GM-CSF в концентрации 0,1-1,0 нг/мл обладал способностью заметно увеличивать содержание CD38 клеток среди наивных Т-клеток (СD45RA/СD197), а также среди Т-клеток центральной памяти (СD45RA/СD197), не оказывая при этом существенного влияния на экспрессию CD38, выявляемую среди эффекторных (СD45RA/СD197) и терминально дифференцированных (СD45RA/СD197) эффекторных Т-клеток. В относительно низкой концентрации (0,01 нг/мл) GM-CSF заметно снижал Т-клеточную продукцию INF-g, тогда как в высокой концентрации (10,0 нг/мл) усиливал продукцию IL-2 и IL-4, снижая при этом выработку IL-10. Заключение. Полученные данные позволяют предположить, что прямые эффекты GM-CSF на функциональную активность Т-клетки могут в значительной степени определяться как ее субпопуляционной принадлежностью, так и концентрацией цитокина в клеточном микроокружении. Background. We studied direct effects of granulocyte-macrophage colony-stimulating factor (GM-CSF) on the function of T-lymphocyte subpopulations. Methods. CD3 T cells were isolated from the blood of healthy donors by positive magnetic separation. Isolated T cells were activated by particles conjugated with antibodies (Abs) to human CD3, CD28, and CD2 molecules. Membrane expression of CD4, СD45RA, СD197, CD25, and CD38 was evaluated by flow cytofluorometry. The contents of interferon-g (IFN-g), interleukin-2 (IL-2), IL-4, and IL-10 were determined in culture supernatants by the enzyme immunoassay. Results. GM-CSF at concentrations of 0.01-10.0 ng/ml had no significant impact on the content of CD25 cells among activated T lymphocytes. At the same time, GM-CSF at 0.1-1.0 ng/ml was able to noticeably increase the CD38 cell content among both naive CD45RA/CD197 T cells and central memory CD45RA/CD197 T cells, without significantly influencing the СD38 expression on effector CD45RA/CD197 and terminal-differentiated (CD45RA / CD197 effector T cells. GM-CSF at a relatively low concentration (0.01 ng/ml) significantly decreased T-cell production of INF-g whereas GM-CSF at a high concentration (10.0 ng/ml) detectably enhanced secretion of IL-2 and IL-4 and lowered IL-10 production. Conclusion. The results suggest that direct effects of GM-CSF on the T cell function could be largely determined by both its belonging to a subpopulation and the cytokine concentration in the cell microenvironment.

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