Mucosal-associated invariant T (MAIT) cells and natural killer T (NKT) cells are known to play important roles in autoimmunity, infectious diseases and cancers. However, little is known about the roles of these invariant T cells in multiple trauma. The purposes of this study were to examine MAIT and NKT cell levels in patients with multiple trauma and to investigate potential relationships between these cell levels and clinical parameters. The study cohort was composed of 14 patients with multiple trauma and 22 non-injured healthy controls (HCs). Circulating MAIT and NKT cell levels in the peripheral blood were measured by flow cytometry. The severity of injury was categorised according to the scoring systems, such as Acute Physiology and Chronic Health Evaluation (APACHE) II score, Simplified Acute Physiology Score (SAPS) II, and Injury Severity Score (ISS). Circulating MAIT and NKT cell numbers were significantly lower in multiple trauma patients than in HCs. Linear regression analysis showed that circulating MAIT cell numbers were significantly correlated with age, APACHE II, SAPS II, ISS category, hemoglobin, and platelet count. NKT cell numbers in the peripheral blood were found to be significantly correlated with APACHE II, SAPS II, and ISS category. This study shows numerical deficiencies of circulating MAIT cells and NKT cells in multiple trauma. In addition, these invariant T cell deficiencies were found to be associated with disease severity. These findings provide important information for predicting the prognosis of multiple trauma.
APACHE ; Autoimmunity ; Cell Count ; Cohort Studies ; Communicable Diseases ; Flow Cytometry ; Humans ; Injury Severity Score ; Linear Models ; Multiple Trauma* ; Natural Killer T-Cells* ; Physiology ; Platelet Count ; Prognosis ; T-Lymphocytes*

Research on innate lymphoid cells (ILC) has recently been a fast paced topic of immunological research. As ILCs are able to produce signature Th cytokine, ILCs have garnered considerable attention and have been described to represent the innate counterpart of the CD4 T helper (Th) cells. The development and function of ILCs are precisely regulated by a network of crucial transcription factors, which are also involved in the development or differentiation of conventional natural killer (cNK) cells and T cells. In this review, we will summarize the key transcriptional regulators and their functions through each phases of ILC development. With the phase of ILC lineage commitment, we will focus in particular on the roles of the transcription regulators Id2 and GATA-3, which in collaboration with other transcriptional factors, are critically involved in the generation of ILC fate determined progenitors. Once an ILC lineage has been established, several other transcription factors are required for the specification and functional regulation of distinct mature ILC subsets. Thus, a comprehensive understanding of the interactions and regulatory mechanisms mediated by these transcription factors will help us to further understand how ILCs exert their helper-like functions and bridge the innate and adaptive immunity.
Animals ; GATA3 Transcription Factor ; immunology ; Humans ; Immunity, Innate ; physiology ; Inhibitor of Differentiation Protein 2 ; immunology ; Killer Cells, Natural ; immunology ; T-Lymphocytes, Helper-Inducer ; immunology

Interleukin-21 (IL-21) is a new member of the interleukin-2 family. It is mainly synthesized and secreted by the activated of CD4(+) T cells and natural killer T cells. IL-21 receptor (IL-21R) is mainly expressed in T cells, B cells, and natural killer (NK) cells. After binding to its receptor, IL-21 can regulate the activation and proliferation of T cells, B cells, and NK cells through activating JAKs-STATs signaling pathways. As a new immunoregulatory factor, IL-21 and its receptor play important roles in the development and progression of various autoimmune diseases. Regulation of the expression levels of IL-21 and IL-21R and blocking of their signal transduction pathways with blockers may be new treatment options for autoimmune diseases.
Animals ; Autoimmune Diseases ; etiology ; immunology ; Dendritic Cells ; immunology ; Humans ; Interleukins ; physiology ; Killer Cells, Natural ; immunology ; Lymphocytes ; immunology ; Receptors, Interleukin-21 ; physiology

Epstein-Barr virus, a ubiquitous human herpesvirus, can induce both lytic and latent infections that result in a variety of human diseases, including lymphoproliferative disorders. The oncogenic potential of Epstein-Barr virus is related to its ability to infect and transform B lymphocytes into continuously proliferating lymphoblastoid cells. However, Epstein-Barr virus has also been implicated in the development of T/natural killer cell lymphoproliferative diseases. Epstein-Barr virus encodes a series of products that mimic several growth, transcription and anti-apoptotic factors, thus usurping control of pathways that regulate diverse homeostatic cellular functions and the microenvironment. However, the exact mechanism by which Epstein-Barr virus promotes oncogenesis and inflammatory lesion development remains unclear. Epstein-Barr virus-associated T/natural killer cell lymphoproliferative diseases often have overlapping clinical symptoms as well as histologic and immunophenotypic features because both lymphoid cell types derive from a common precursor. Accurate classification of Epstein-Barr virus-associated T/natural killer cell lymphoproliferative diseases is a prerequisite for appropriate clinical management. Currently, the treatment of most T/natural killer cell lymphoproliferative diseases is less than satisfactory. Novel and targeted therapies are strongly required to satisfy clinical demands. This review describes our current knowledge of the genetics, oncogenesis, biology, diagnosis and treatment of Epstein-Barr virus-associated T/natural killer cell lymphoproliferative diseases.
Cell Transformation, Viral ; Epstein-Barr Virus Infections/*complications ; Herpesvirus 4, Human/*physiology ; Humans ; Killer Cells, Natural/immunology/metabolism/*pathology/*virology ; Lymphoproliferative Disorders/diagnosis/*etiology/therapy ; T-Lymphocytes/immunology/metabolism/*pathology/*virology

The development of highly immunodeficient mouse strains has allowed the reconstitution of functional human immune system components in mice. New-generation humanized mice generated in this manner have been extensively used for modeling viral infections that are exclusively human tropic. Epstein-Barr virus (EBV)-infected humanized mice reproduce cardinal features of EBV-associated B-cell lymphoproliferative disease and EBV-associated hemophagocytic lymphohistiocytosis (HLH). Erosive arthritis morphologically resembling rheumatoid arthritis (RA) has also been recapitulated in these mice. Low-dose EBV infection of humanized mice results in asymptomatic, persistent infection. Innate immune responses involving natural killer cells, EBV-specific adaptive T-cell responses restricted by human major histocompatibility and EBV-specific antibody responses are also elicited in humanized mice. EBV-associated T-/natural killer cell lymphoproliferative disease, by contrast, can be reproduced in a distinct mouse xenograft model. In this review, recent findings on the recapitulation of human EBV infection and pathogenesis in these mouse models, as well as their application to preclinical studies of experimental anti-EBV therapies, are described.
Animals ; Disease Models, Animal ; Epstein-Barr Virus Infections/complications/immunology/*virology ; Herpesvirus 4, Human/*physiology ; Heterografts ; Humans ; Killer Cells, Natural/pathology/virology ; Lymphoproliferative Disorders/etiology ; Mice ; Mice, SCID ; T-Lymphocytes/pathology/virology

Killer cell immunoglobulin-like receptors (KIRs) which are mainly expressed on natural killer (NK) cells are implicated in many virus infections. However, it is unclear whether or not KIRs are associated with susceptibility to Epstein-Barr virus (EBV) infection related diseases. Therefore, the purpose of our study was to investigate possible correlation between polymorphisms of KIR genes and infectious mononucleosis (IM)/EBV-associated hemophagocytic lymphohistiocytosis (EBV-HLH). The polymorphisms of KIR genes were detected by polymerase chain reaction with sequence-specific primers (PCR-SSP). The results would contribute to clarify the association of KIRs with EBV induced diseases, and provide new insights into the role of NK cells and innate immune response against viral infections and/or subsequent progression.
Case-Control Studies ; Child ; Child, Preschool ; China ; Disease Progression ; Female ; Herpesvirus 4, Human ; physiology ; Humans ; Immunity, Innate ; Infectious Mononucleosis ; genetics ; immunology ; virology ; Killer Cells, Natural ; immunology ; metabolism ; Lymphohistiocytosis, Hemophagocytic ; genetics ; immunology ; virology ; Male ; Polymerase Chain Reaction ; Polymorphism, Genetic ; Receptors, KIR ; genetics ; metabolism

BACKGROUND/AIMS: This study aimed to detect the expression of natural killer (NK) cell receptor natural killer group 2D (NKG2D) in the peripheral blood of patients with primary hepatocellular carcinoma and to discuss the correlation between NK cell cytotoxicity and liver function. METHODS: The number of NK cells and the expression of NK cell receptor NKG2D in peripheral blood were determined by flow cytometry in patients with primary hepatocellular carcinoma, hepatitis B cirrhosis, chronic hepatitis B, and healthy controls. RESULTS: When compared with patients in the healthy and the chronic hepatitis B groups, the primary hepatocellular carcinoma group showed significant decreases in all parameters, including the cytotoxicity of NK cells on K562 cells, expression rate of NKG2D in NK cells, number of NKG2D+ NK cells, expression level of NKG2D, and number of NK cells (p<0.05). The activity of NK cells showed a positive correlation, whereas the Child-Pugh scores in the primary hepatocellular carcinoma and the hepatitis B cirrhosis groups showed a negative correlation with all parameters detected above. CONCLUSIONS: The decrease of NK cell activity in patients with primary hepatocellular carcinoma is closely related to their lower expression of NKG2D. Liver function affects the expression of NKG2D and the activity of NK cells.
Carcinoma, Hepatocellular/*physiopathology ; Case-Control Studies ; Female ; Humans ; K562 Cells ; Killer Cells, Natural/*physiology ; Liver Neoplasms/*physiopathology ; Lymphocyte Subsets/physiology ; Lymphopenia/physiopathology ; Male ; Middle Aged ; NK Cell Lectin-Like Receptor Subfamily K/metabolism ; T-Lymphocytes, Cytotoxic/physiology

Ginseng and its effective components are famous for their influence to enhance human immunity, regulate endocrine and antioxidant action. However, the different effects of different components are not clear. In this study, Wistar rats were used to study the effects of main components of ginseng, including total ginsenoside, panaxadiol saponins, panaxtrol saponin and ginseng polysaccharide. The results showed that the effects of panaxadiol saponins and ginseng polysaccharide on improving animal immune organ weight, plasma interleukin 2 (IL-2), interleukin 6 (IL-6), plasma gamma-interferon (IFN-γ), tumor necrosis factor alpha (TNF-α) were better than that of the other groups. Total ginsenoside and panaxtrol saponin can effectively increase the concentration of spleen NK cells (NKC) while panaxadiol saponins and ginseng polysaccharide can significantly increase the concentrations of rat plasma adrenocorticotrophic hormone (ACTH), corticosterone (CORT) and thyroid stimulating hormone (TSH). As for the effect of increasing organization nitric oxide (NO) and superoxide dismutase (SOD), glutathione (GSH) and malondialdehyde (MDA), total ginsenoside is better than that of other groups. In brief, different components in ginseng possess different effects on enhancing immunity, regulating endocrine and resisting oxidation. Panaxadiol saponins and ginseng polysaccharide are better in enhancing immune, and total ginsenoside shows advantages in resisting oxidation and stress.
Adrenal Glands ; drug effects ; growth & development ; Adrenocorticotropic Hormone ; blood ; Animals ; Brain ; drug effects ; metabolism ; Corticosterone ; blood ; Ginsenosides ; pharmacology ; Glutathione ; metabolism ; Immune System ; drug effects ; physiology ; Interferon-gamma ; blood ; Interleukin-2 ; blood ; Interleukin-6 ; blood ; Killer Cells, Natural ; drug effects ; Malondialdehyde ; metabolism ; Nitric Oxide ; metabolism ; Organ Size ; drug effects ; Panax ; chemistry ; Polysaccharides ; pharmacology ; Random Allocation ; Rats, Wistar ; Saponins ; pharmacology ; Spleen ; drug effects ; growth & development ; Superoxide Dismutase ; metabolism ; Thymus Gland ; drug effects ; growth & development ; Thyrotropin ; blood

Human cytomegalovirus (HCMV) is an ubiquitous pathogen that infects a majority of the world's population. The virus can establish lifelong infection once the human body is infected by HCMV and virus can be reactivated from a latent state in immune suppressed individuals. HCMV has developed several strategies to evade host immune surveillance after millions of years of co-evolution with mankind. One of the classical tricks is encoding homologous to human immune factors or stealing host cellular genes that have significant functions in immune system. Virus encoded immune modulators which participate in regulating the major histocompatibility complex, cellular immunity, humoral immunity, cytokines and chemokines are supposed to play a significant role in the pathogenesis of HCMV. Evaluation of "mutually assured survival" relationship between virus and host provides important insights into viral immunopathogenesis and study of viral immunomodulatory proteins might help us to uncover new human genes that control immunity.
Animals ; Chemokines ; physiology ; Cytokines ; physiology ; Cytomegalovirus ; pathogenicity ; Cytomegalovirus Infections ; immunology ; Game Theory ; Humans ; Immunity, Humoral ; Killer Cells, Natural ; immunology

OBJECTIVETo review the mechanisms by which HIV evades different components of the host immune system.

DATA SOURCESThis review is based on data obtained from published articles from 1991 to 2012. To perform the PubMed literature search, the following key words were input: HIV and immune evasion.

STUDY SELECTIONArticles containing information related to HIV immune evasion were selected.

RESULTSAlthough HIV is able to induce vigorous antiviral immune responses, viral replication cannot be fully controlled, and neither pre-existing infected cells nor latent HIV infection can be completely eradicated. Like many other enveloped viruses, HIV can escape recognition by the innate and adaptive immune systems. Recent findings have demonstrated that HIV can also successfully evade host restriction factors, the components of intrinsic immune system, such as APOBEC3G (apolipoprotein B mRNA-editing enzyme, catalytic polypeptide-like 3G), TRIM5α (tripartite motif 5-α), tetherin, and SAMHD1 (SAM-domain HD-domain containing protein).

CONCLUSIONSHIV immune evasion plays an important role in HIV pathogenesis. Fully understanding the tactics deployed by HIV to evade various components of the host immune systems will allow for the development of novel strategies aimed toward the prevention and cure of HIV/AIDS.

APOBEC-3G Deaminase ; Adaptive Immunity ; Antibodies, Neutralizing ; immunology ; Antigens, CD ; physiology ; Carrier Proteins ; physiology ; Complement System Proteins ; immunology ; Cytidine Deaminase ; physiology ; GPI-Linked Proteins ; physiology ; HIV-1 ; immunology ; Humans ; Immune Evasion ; Killer Cells, Natural ; immunology ; Monomeric GTP-Binding Proteins ; physiology ; SAM Domain and HD Domain-Containing Protein 1