Chlamydia pneumoniaeinfection suppressesStaphylococcusenterotoxin B-induced proliferation associated with down-expression of CD25 in lymphocytes

2010 ◽  
Vol 56 (4) ◽  
pp. 289-294 ◽  
Author(s):  
Itaru Hirai ◽  
Maki Utsumi ◽  
Hiroyuki Yamaguchi ◽  
Yoshimasa Yamamoto
Keyword(s):  
Immune Modulation ◽  
Chlamydia Pneumoniae ◽  
Inflammatory Diseases ◽  
Human Peripheral Blood ◽  
Cell Number ◽  
Peripheral Blood Lymphocytes ◽  
Lymphocyte Function ◽  
Immune Functions ◽  
Cd25 Expression ◽  
Enterotoxin B

Chlamydia pneumoniae ( Chlamydophila pneumoniae ) infects lymphocytes and modulates their immune functions; this is critical in the development of chronic inflammatory diseases associated with this pathogen. Therefore, to clarify this immune modulation due to C. pneumoniae infection, the effect of this infection on the proliferation of human peripheral blood lymphocytes was examined. Lymphocytes were proliferated by stimulation with Staphylococcus aureus enterotoxin B, and the cell number was increased up to 3 times the unstimulated lymphocyte number. Further, induction of CD25 expression was observed in 55.8% of lymphocytes. Infection with C. pneumoniae suppressed the proliferation of almost half the lymphocytes induced by stimulation with S. aureus enterotoxin B, and CD25 induction was inhibited in 64.7% of lymphocytes. Inhibition of CD25 expression was observed in both infected and uninfected lymphocytes in culture. However, the expression of VLA4 was not affected by C. pneumoniae infection. Furthermore, inhibition was observed only by infection with viable C. pneumoniae and not by the heat-killed bacteria. These results suggest that C. pneumoniae affects lymphocyte function by inhibiting proliferation and CD25 expression in response to immunological stimulation, possibly via humoral mediator(s).

scholarly journals Chlamydia pneumoniae Infects and Multiplies in Lymphocytes In Vitro

2001 ◽  
Vol 69 (12) ◽  
pp. 7753-7759 ◽  
Author(s):  
Shusaku Haranaga ◽  
Hiroyuki Yamaguchi ◽  
Herman Friedman ◽  
Shin-ichi Izumi ◽  
Yoshimasa Yamamoto
Keyword(s):  
Immune Cells ◽  
Chlamydia Pneumoniae ◽  
Inflammatory Diseases ◽  
Human Peripheral Blood ◽  
Peripheral Blood Lymphocytes ◽  
Host Cells ◽  
Obligate Intracellular Pathogen ◽  
Spleen Lymphocytes ◽  
Lymphocyte Cell

ABSTRACT The obligate intracellular pathogen Chlamydia (Chlamydophila) pneumoniae is known to be associated with some chronic inflammatory diseases, such as atherosclerosis. Interaction between C. pneumoniae and immune cells is important in the development of such diseases. However, susceptibility of immune cells, particularly lymphocytes, to C. pneumoniaeinfection has not been reported, even though lymphocytes play a pivotal role in the development of the diseases caused by this bacterium. In this regard, we examined the susceptibility of lymphocytes to C. pneumoniae infection in vitro. The results demonstrated that human peripheral blood lymphocytes as well as mouse spleen lymphocytes could be infected with C. pneumoniae. Furthermore, purified T lymphocytes as well as established T-lymphocyte cell line cells showed an obvious susceptibility to C. pneumoniaeinfection, indicating that T cells could be one of the host cells for this bacterial infection. These findings reveal a new infection site for C. pneumoniae, i.e., lymphocytes.

scholarly journals Investigation of the Immune Modulatory Potential of Zinc Oxide Nanoparticles in Human Lymphocytes

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 629
Author(s):  
Helena Moratin ◽  
Pascal Ickrath ◽  
Agmal Scherzad ◽  
Till Jasper Meyer ◽  
Sebastian Naczenski ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Immune Modulation ◽  
Human Peripheral Blood ◽  
Human Lymphocytes ◽  
Drug Carriers ◽  
Physiological Model ◽  
Peripheral Blood Lymphocytes ◽  
Major Influence ◽  
Oxide Nanoparticles

Zinc oxide nanoparticles (ZnO-NP) are commonly used for a variety of applications in everyday life. In addition, due to its versatility, nanotechnology supports promising approaches in the medical sector. NP can act as drug-carriers in the context of targeted chemo- or immunotherapy, and might also exhibit autonomous immune-modulatory characteristics. Knowledge of potential immunosuppressive or stimulating effects of NP is indispensable for the safety of consumers as well as patients. In this study, primary human peripheral blood lymphocytes of 9 donors were treated with different sub-cytotoxic concentrations of ZnO-NP for the duration of 1, 2, or 3 days. Flow cytometry was performed to investigate changes in the activation profile and the proportion of T cell subpopulations. ZnO-NP applied in this study did not induce any significant alterations in the examined markers, indicating their lack of impairment in terms of immune modulation. However, physicochemical characteristics exert a major influence on NP-associated bioactivity. To allow a precise simulation of the complex molecular processes of immune modulation, a physiological model including the different components of an immune response is needed.

scholarly journals Induction of an antibody response in cultures of human peripheral blood lymphocytes.

1976 ◽  
Vol 144 (3) ◽  
pp. 573-585 ◽  
Author(s):  
A L Luzzati ◽  
M J Taussig ◽  
T Meo ◽  
B Pernis
Keyword(s):  
Antibody Response ◽  
Peripheral Blood ◽  
Human Peripheral Blood ◽  
Cell Number ◽  
Peripheral Blood Lymphocytes ◽  
In Vitro Immunization ◽  
Blood Lymphocytes ◽  
Human Peripheral Blood Lymphocytes ◽  
Negative Results

A culture system is descirbed which provides adequate conditions for in vitro immunization of humand peripheral blood lymphocytes to heterologous erythrocytes. Making use of this method we could obtain, with a number of different donors, an antibody response which peaked at about day 8 of culture with 30-300 plaque-forming cells (PFC) per 10(6) input lymphocytes. However, in a number of experiments poor or negative results were obtained, even with donors that had previously given good response. This variability in the results was shown not to be due to a too low number of precursor cells present in the blood and could be overcome by treating the cells, before initiation of the culture, with a factor produced by mouse T cells educated to sheep erythrocytes (SRBC). Under these conditions a PFC responce was obtained which peaked at about day 8 and which in some experiments could be as high as 20,000 PFC per 10(6) input lymphocytes. Paralleling the increase in PFC was an increase in cell number. The cells recovered from the treated cultures were at all times more numerous than in the nontreated cultures. The height of both the proliferative and antibody-producing responses varied from experiment to experiment, a higher proliferative response, accompanying a higher PFC response. Although the mechanisms that are at the basis of the antibody response in vitro described in this paper still need to be clarified, this system may become a useful tool in studying the immune response in man.

Immune modulation property of Lactobacillus paracasei NCC2461 (ST11) strain and impact on skin defences

2014 ◽  
Vol 5 (2) ◽  
pp. 129-136 ◽  
Author(s):  
J. Benyacoub ◽  
N. Bosco ◽  
C. Blanchard ◽  
A. Demont ◽  
D. Philippe ◽  
...  
Keyword(s):  
Immune System ◽  
Immune Modulation ◽  
Inflammatory Diseases ◽  
Skin Barrier ◽  
Probiotic Strain ◽  
Skin Barrier Function ◽  
Immune Functions ◽  
Skin Immune System ◽  
Skin Physiology ◽  
Immune Dysfunctions

The gut intestinal tract harbours a complex microbiota. Disturbances in the microbiota composition have been associated with several immune dysfunctions such as inflammatory diseases. Specific strains of probiotics have shown to beneficially influence the composition and/or metabolic activity of the endogenous microbiota. Taking advantage of the plasticity of the immune system, the probiotic strain NCC2461 (i.e. ST11 or CNCM I-2116) supports and/or restores homeostasis in reaction to different physiopathological conditions. The potential of NCC2461 to modulate both mucosal and systemic immune functions led us to test its impact on skin physiology. Even though clear mechanisms explaining gut-skin interaction are still lacking, a set of experimental and clinical data reviewed herein have shown that NCC2461 exerts its effects beyond the gut and confers benefits at the skin level. It contributes to the reinforcement of skin barrier function, decreases skin sensitivity and modulates the skin immune system leading to the preservation of skin homeostasis.

scholarly journals Protein phosphorylation in human peripheral blood lymphocytes. Phosphorylation of endogenous plasma membrane and cytoplasmic proteins

1979 ◽  
Vol 182 (2) ◽  
pp. 537-546 ◽  
Author(s):  
David D. Chaplin ◽  
H. James Wedner ◽  
Charles W. Parker
Keyword(s):  
Plasma Membrane ◽  
Cyclic Amp ◽  
Peripheral Blood ◽  
Human Peripheral Blood ◽  
Peripheral Blood Lymphocytes ◽  
Subcellular Fractions ◽  
Lymphocyte Function ◽  
Blood Lymphocytes ◽  
Human Peripheral Blood Lymphocytes ◽  
Cytoplasmic Proteins

Phosphorylation of endogenous proteins in subcellular fractions of human peripheral-blood lymphocytes was studied by one- and two-dimensional polyacrylamide-gel electrophoresis. Studies using extensively purified subcellular fractions indicated that the endogenous phosphorylating activity in the particulate fractions was derived primarily from the plasma membrane. Electrophoresis of 32P-labelled subcellular fractions in two dimensions [O'Farrell (1975) J. Biol. Chem.250, 4007–4021] provided much greater resolution of the endogenous phosphoproteins than electrophoresis in one dimension, facilitating their excision from gels for quantification of 32P content. More than 100 cytoplasmic and 20 plasma-membrane phosphorylated species were observed. Phosphorylation of more than 10 cytoplasmic proteins was absolutely dependent on cyclic AMP. In the plasma membrane, cyclic AMP-dependent phosphoproteins were observed with mol.wts. of 42000, 42000, 80000 and 90000 and pI values of 6.1, 6.3, 6.25 and 6.5 respectively. Phosphorylation of endogenous cytoplasmic and plasma-membrane proteins was rapid with t½=5–12s at 25°C. Between 40 and 70% of the 32P was recovered as phosphoserine and phosphothreonine when acid hydrolysates of isolated plasma-membrane phosphoproteins were analysed by high-voltage paper electrophoresis. The presence of cyclic AMP-dependent protein kinase and endogenous phosphate-acceptor proteins in the plasma membranes of lymphocytes provides a mechanism by which these cells might respond to plasma-membrane pools of cyclic AMP generated in response to stimulation by mitogens or physiological modulators of lymphocyte function.

Fibronectin augments anti-CD3-mediated IL-2 receptor (CD25) expression on human peripheral blood lymphocytes

1991 ◽  
Vol 135 (1) ◽  
pp. 105-117 ◽  
Author(s):  
Pina M. Cardarelli ◽  
Shinsuke Yamagata ◽  
Wolfgang Scholz ◽  
Mary A. Moscinski ◽  
Edward L. Morgan
Keyword(s):  
Peripheral Blood ◽  
Human Peripheral Blood ◽  
Peripheral Blood Lymphocytes ◽  
Blood Lymphocytes ◽  
Cd25 Expression ◽  
Human Peripheral Blood Lymphocytes

Biological Aspects and Clinical Applications of Mesenchymal Stem Cells: Key Features You Need to be Aware of.

2020 ◽  
Vol 21 ◽  
Author(s):  
Mohammad Saeedi ◽  
Muhammad Sadeqi Nezhad ◽  
Fatemeh Mehranfar ◽  
Mahdieh Golpour ◽  
Mohammad Ali Esakandari ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Cancer Cells ◽  
Immune Modulation ◽  
Adult Stem Cells ◽  
Inflammatory Diseases ◽  
High Capacity ◽  
Genetically Engineered ◽  
Cartilage Cells ◽  
Biological Aspects

: Mesenchymal stem cells (MSCs), a form of adult stem cells, are known to have a self-renewing property and the potential to specialize into a multitude of cells and tissues such as adipocytes, cartilage cells, and fibroblasts. MSCs can migrate and home to the desired target zone where inflammation is present. The unique characteristics of MSCs in repairing, differentiation, regeneration, and its high capacity of immune modulation has attracted tremendous attention for exerting them in clinical purposes, as they contribute to tissue regeneration process and anti-tumor activity. The MSCs-based treatment has demonstrated remarkable applicability towards various diseases such as heart and bone malignancies, and cancer cells. Importantly, genetically engineered MSCs, as a state-of-the-art therapeutic approach, could address some clinical hurdles by systemic secretion of cytokines and other agents with a short half-life and high toxicity. Therefore, understanding the biological aspects and the characteristics of MSCs is an imperative issue of concern. Herein, we provide an overview of the therapeutic application and the biological features of MSCs against different inflammatory diseases and cancer cells. We further shed light on MSCs physiological interaction, such as migration, homing, and tissue repairing mechanisms with different healthy and inflamed tissues.

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