RESUMO
γδ T cells are a kind of innate immune T cell. They have not attracted sufficient attention because they account for only a small proportion of all immune cells, and many basic factors related to these cells remain unclear. However, in recent years, with the rapid development of tumor immunotherapy, γδ T cells have attracted increasing attention because of their ability to exert cytotoxic effects on most tumor cells without major histocompatibility complex (MHC) restriction. An increasing number of basic studies have focused on the development, antigen recognition, activation, and antitumor immune response of γδ T cells. Additionally, γδ T cell-based immunotherapeutic strategies are being developed, and the number of clinical trials investigating such strategies is increasing. This review mainly summarizes the progress of basic research and the clinical application of γδ T cells in tumor immunotherapy to provide a theoretical basis for further the development of γδ T cell-based strategies in the future.
Assuntos
Humanos , Receptores de Antígenos de Linfócitos T gama-delta , Imunoterapia Adotiva , Linfócitos T , Imunoterapia , Neoplasias/terapiaRESUMO
Spinal cord injury (SCI) causes motor, sensory, and autonomic dysfunctions. The gut microbiome has an important role in SCI, while short-chain fatty acids (SCFAs) are one of the main bioactive mediators of microbiota. In the present study, we explored the effects of oral administration of exogenous SCFAs on the recovery of locomotor function and tissue repair in SCI. Allen's method was utilized to establish an SCI model in Sprague-Dawley (SD) rats. The animals received water containing a mixture of 150 mmol/L SCFAs after SCI. After 21 d of treatment, the Basso, Beattie, and Bresnahan (BBB) score increased, the regularity index improved, and the base of support (BOS) value declined. Spinal cord tissue inflammatory infiltration was alleviated, the spinal cord necrosis cavity was reduced, and the numbers of motor neurons and Nissl bodies were elevated. Enzyme-linked immunosorbent assay (ELISA), real-time quantitative polymerase chain reaction (qPCR), and immunohistochemistry assay revealed that the expression of interleukin (IL)-10 increased and that of IL-17 decreased in the spinal cord. SCFAs promoted gut homeostasis, induced intestinal T cells to shift toward an anti-inflammatory phenotype, and promoted regulatory T (Treg) cells to secrete IL-10, affecting Treg cells and IL-17+ γδ T cells in the spinal cord. Furthermore, we observed that Treg cells migrated from the gut to the spinal cord region after SCI. The above findings confirm that SCFAs can regulate Treg cells in the gut and affect the balance of Treg and IL-17+ γδ T cells in the spinal cord, which inhibits the inflammatory response and promotes the motor function in SCI rats. Our findings suggest that there is a relationship among gut, spinal cord, and immune cells, and the "gut-spinal cord-immune" axis may be one of the mechanisms regulating neural repair after SCI.
Assuntos
Animais , Ratos , Interleucina-17 , Ratos Sprague-Dawley , Recuperação de Função Fisiológica , Traumatismos da Medula Espinal/tratamento farmacológico , Linfócitos T Reguladores , Receptores de Antígenos de Linfócitos T gama-delta/imunologiaRESUMO
Abstract Objective To evaluate the antitumoral role of γδ TDC cells and αβ TDC cells in an experimental model of breast cancer. Methods Thirty female Balb/c mice were divided into 2 groups: control group (n=15) and induced-4T1 group (n=15), in which the mice received 2 x 105 4T1 mammary tumor cell line. Following the 28-day experimental period, immune cells were collected from the spleen and analyzed by flow cytometry for comparison of αβ TDC (TCRαβ+ CD11c+MHCII+) and γδ TDC (TCRγδ+CD11c+MHCII+) cells regarding surface markers (CD4+ and C8+) and cytokines (IFN-γ, TNF-α, IL-12 and IL-17). Results A total of 26.53% of γδ TDC- control group (p<0.0001) - the proportion of αβ TDC was lower in splenic cells than γδ TDC; however, these 2 cell types were reduced in tumor conditions (p<0.0001), and the proportion of IFN-γ, TNF-α, IL-12 and IL-17 cytokines produced by γδ TDC was higher than those produced by αβ TDC, but it decreased under conditions of tumor-related immune system response (p<0.0001). Conclusion Healthy mice engrafted with malignant cells 4T1 breast tumor presented TDC with γδ TCR repertoire. These cells express cytotoxic molecules of lymphocytes T, producing anti-tumor proinflammatory cytokines.
Resumo Objetivo Esclarecer o possível papel antitumoral das células TDC γδ e TDC αβ em um modelo experimental de câncer de mama. Métodos Trinta baços de camundongos Balb/c analisados por citometria de fluxo, separados entre grupo controle (n=15) e o grupo tumoral induzido por 4T1 (n=15). Resultados Presença de 26,53% de TDC γδ nos camundongos do grupo controle (p<0,0001), proporção de TDC αβ menor em células esplênicas do que TDC γδ; no entanto, estes dois tipos de células são reduzidos emcondições tumorais (p<0,0001), e a proporção de citocinas IFN-γ, TNF-α, IL-12 e IL-17 produzidas pelas célula TDC γδ foi maior do que as produzidas pelas células TDC αβ, mas foram diminuídas sob condições de resposta ao sistema imunológico relacionada ao tumor (p<0,0001). Conclusão Camundongos saudáveis induzidos ao tumor de mama 4T1 apresentaram TDC com repertório TCR γδ. Estas células expressam moléculas citotóxicas de linfócitos T, produzindo citocinas proinflamatórias anti-tumor.
Assuntos
Animais , Feminino , Camundongos , Neoplasias da Mama/imunologia , Receptores de Antígenos de Linfócitos T gama-delta/imunologia , Receptores de Antígenos de Linfócitos T gama-delta/metabolismo , Receptores de Antígenos de Linfócitos T alfa-beta/imunologia , Receptores de Antígenos de Linfócitos T alfa-beta/metabolismo , Baço/imunologia , Baço/metabolismo , Interleucina-17 , Citometria de Fluxo , Camundongos Endogâmicos BALB CRESUMO
The γδ T cells are unconventional lymphocytes that function in both innate and adaptive immune responses against various intracellular and infectious stresses. The γδ T cells can be exploited as cancer-killing effector cells since γδ TCRs recognize MHC-like molecules and growth factor receptors that are upregulated in cancer cells, and γδ T cells can differentiate into cytotoxic effector cells. However, γδ T cells may also promote tumor progression by secreting IL-17 or other cytokines. Therefore, it is essential to understand how the differentiation and homeostasis of γδ T cells are regulated and whether distinct γδ T cell subsets have different functions. Human γδ T cells are classified into Vδ2 and non-Vδ2 γδ T cells. The majority of Vδ2 γδ T cells are Vγ9δ2 T cells that recognize pyrophosphorylated isoprenoids generated by the dysregulated mevalonate pathway. In contrast, Vδ1 T cells expand from initially diverse TCR repertoire in patients with infectious diseases and cancers. The ligands of Vδ1 T cells are diverse and include the growth factor receptors such as endothelial protein C receptor. Both Vδ1 and Vδ2 γδ T cells are implicated to have immunotherapeutic potentials for cancers, but the detailed elucidation of the distinct characteristics of 2 populations will be required to enhance the immunotherapeutic potential of γδ T cells. Here, we summarize recent progress regarding cancer immunology of human γδ T cells, including their development, heterogeneity, and plasticity, the putative mechanisms underlying ligand recognition and activation, and their dual effects on tumor progression in the tumor microenvironment.
Assuntos
Humanos , Alergia e Imunologia , Doenças Transmissíveis , Citocinas , Homeostase , Interleucina-17 , Ligantes , Linfócitos , Ácido Mevalônico , Plásticos , Características da População , Proteína C , Receptores de Antígenos de Linfócitos T gama-delta , Receptores de Fatores de Crescimento , Subpopulações de Linfócitos T , Linfócitos T , Terpenos , Microambiente TumoralRESUMO
OBJECTIVE@#To study the role of gamma-delta T (γδ T) cells and its subsets in the immunopathogenesis of Henoch-Schönlein purpura (HSP) in children, and to provide new ideas for the treatment of HSP in children from the aspect of γδ T cell regulation.@*METHODS@#A total of 33 children with HSP were enrolled as the HSP group, and 21 healthy children were enrolled as the healthy control group. The percentages of γδ T cells and its subsets Vδ1 T and Vδ2 T cells among peripheral blood mononuclear cells (PBMCs) were measured, as well as the apoptosis rate of γδ T cell and plasma level of interleukin-17 (IL-17).@*RESULTS@#Compared with the healthy control group, the HSP group had significantly lower percentages of lymphocytes in PBMCs and Vδ2 T cells in γδ T cells (P<0.05). The HSP group had significantly higher percentage of Vδ1 T cells in γδ T cells and plasma level of IL-17 than the healthy control group. The HSP group had a significantly higher overall apoptosis rate of γδ T cells than the healthy control group (P<0.05), especially early apoptosis. The percentage of Vδ2 T cells was positively correlated with overall apoptosis rate (r=0.615, P<0.05) and was negatively correlated with IL-17 level (r=-0.398, P<0.05).@*CONCLUSIONS@#Vδ1/Vδ2 T cell immune imbalance mediated by γδ T cells and over-activation of IL-17 may be involved in the development of HSP, among which the disturbance of immune tolerance induced by Vδ2 T cells plays an important role in the pathophysiology of the disease.
Assuntos
Criança , Humanos , Leucócitos Mononucleares , Vasculite por IgA , Receptores de Antígenos de Linfócitos T gama-delta , Linfócitos TRESUMO
Objective To investigate the expression and regulation of programmed cell death protein 1 (PD1), B lymphocyte and T lymphocyte attenuator (BTLA) in peripheral blood of patients with non-small cell lung cancer (NSCLC); to examine the correlation of the mRNA levels between PD and BTLA in NSCLC. Methods Flow cytometry was used to detect the expression of PD1 and BTLA on the surfaces of CD8+ T cells and γδ+ T cells in the peripheral blood samples collected from 32 in-patients with stage IV NSCLC and 30 healthy individuals. We compared the expression of PD1 and BTLA on the surfaces of γδ+ T cells in the NSCLC patients with bone metastasis before and after the treatment of zoledronic acid. The correlations of PD1 and BTLA, as well as their ligands were analyzed using Pearson correlation analysis with the cBioPortal data platform. Results The frequency of PD1 on the surfaces of CD8+ T cells was significantly higher than that of the γδT cells in both healthy controls (t=2.324, P=0.024) and NSCLC patients(t=2.498, P=0.015). The frequency of PD1 on CD8+ T cells, rather than on γδ+ T cells, was significantly upregulated in advanced NSCLC patients compared with that in healthy controls (t=4.829, P<0.001). The PD1+ BTLA+γδT cells of the healthy controls were significantly lower than that of the NSCLC patients (t=2.422, P=0.0185). No differences in percentage of PD1+γδ+ and BTLA+γδ+ T cells were observed in 7 NSCLC patients with bone metastasis before and after zoledronic acid treatment. PD1 was positively correlated with BTLA in both lung adenocarcinoma (r=0.54; P<0.05) and lung squamous cell carcinoma (r=0.78; P<0.05). Conclusions The upregulation of co-inhibitory molecules occurs on the surfaces of both CD8+ T cells and γδT cells in advanced NSCLC, suggesting that these molecules were involved in regulating the inactivation of CD8+ T cells and γδ+ T cells, immune escape and tumor invasion.
Assuntos
Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasias Ósseas/secundário , Linfócitos T CD8-Positivos , Carcinoma Pulmonar de Células não Pequenas/imunologia , Estudos de Casos e Controles , Regulação Neoplásica da Expressão Gênica , Ligantes , Neoplasias Pulmonares/imunologia , Subpopulações de Linfócitos/imunologia , Receptor de Morte Celular Programada 1/metabolismo , RNA Mensageiro/metabolismo , Receptores de Antígenos de Linfócitos T gama-delta , Receptores Imunológicos/metabolismoRESUMO
γδ T cells are abundant in the gut mucosa and play an important role in adaptive immunity as well as innate immunity. Although γδ T cells are supposed to be associated with the enhancement of Ab production, the status of γδ T cells, particularly in the synthesis of IgA isotype, remains unclear. We compared Ig expression in T cell receptor delta chain deficient (TCRδ⁻/⁻) mice with wild-type mice. The amount of IgA in fecal pellets was substantially elevated in TCRδ⁻/⁻ mice. This was paralleled by an increase in surface IgA expression and total IgA production by Peyer's patches (PPs) and mesenteric lymph node (MLN) cells. Likewise, the TCRδ⁻/⁻ mice produced much higher levels of serum IgA isotype. Here, surface IgA expression and number of IgA secreting cells were also elevated in the culture of spleen and bone marrow (BM) B cells. Germ-line α transcript, an indicator of IgA class switch recombination, higher in PP and MLN B cells from TCRδ⁻/⁻ mice, while it was not seen in inactivated B cells. Nevertheless, the frequency of IgA+ B cells was much higher in the spleen from TCRδ⁻/⁻ mice. These results suggest that γδ T cells control the early phase of B cells, in order to prevent unnecessary IgA isotype switching. Furthermore, this regulatory role of γδ T cells had lasting effects on the long-lived IgA-producing plasma cells in the BM.
Assuntos
Animais , Camundongos , Imunidade Adaptativa , Linfócitos B , Medula Óssea , Imunidade Inata , Imunoglobulina A , Switching de Imunoglobulina , Linfonodos , Mucosa , Nódulos Linfáticos Agregados , Plasmócitos , Receptores de Antígenos de Linfócitos T gama-delta , Recombinação Genética , Baço , Linfócitos TRESUMO
<p><b>OBJECTIVE</b>To investigate the percentages of peripheral blood γδ T cells and regulatory T cells (Treg) and the expression of associated cytokines, interleukin 17 (IL-17) and transforming growth factor-β1 (TGF-β1), in infants with human cytomegalovirus (HCMV) infection.</p><p><b>METHODS</b>Twenty-two infants with HCMV infection (HCMV group) and 22 healthy infants who underwent physical examination (control group) were enrolled in this study. The percentages of peripheral blood γδ T cells and Treg cells were determined by flow cytometry. The levels of IL-17 and TGF-β1 in plasma were measured using ELISA.</p><p><b>RESULTS</b>Compared with the control group, the HCMV group had significantly higher percentage of γδ T cells and IL-17 level (P<0.01) and significantly lower percentage of Treg cells and TGF-β1 level (P<0.01). In the HCMV group, the percentage of γδ T cells was negatively correlated with the percentage of Treg cells and TGF-β1 level (P<0.05), but positively correlated with IL-17 level (P<0.05); the percentage of Treg cells was positively correlated with TGF-β1 level (P<0.05), but negatively correlated with IL-17 level (P<0.05); there was no correlation between IL-17 level and TGF-β1 level (P>0.05).</p><p><b>CONCLUSIONS</b>There is an imbalance between γδ T cells and Treg cells in the peripheral blood of infants with HCMV infection, and γδ T cells may be involved in the secretion of IL-17.</p>
Assuntos
Feminino , Humanos , Lactente , Masculino , Citocinas , Sangue , Infecções por Citomegalovirus , Alergia e Imunologia , Interleucina-17 , Sangue , Receptores de Antígenos de Linfócitos T gama-delta , Linfócitos T Reguladores , Alergia e Imunologia , Fator de Crescimento Transformador beta1 , SangueRESUMO
Linfoma multicêntrico apresenta alta prevalência dentre as neoplasias em cães, e o diagnóstico rotineiro não é eficaz para avaliação de prognóstico. A PCR para rearranjos de receptores de antígeno (PRRA) apresenta potencial para classificação e estadiamento de linfomas. Este trabalho objetiva relatar o desenvolvimento de um protocolo de PRRA para aplicação em cães, baseando-se em condições e primers descritos na literatura. Foram coletados aspirados de linfonodo de 10 cães com linfoma multicêntrico e 15 lâminas de linfonodo positivas para linfoma já secas ao ar, fixadas e coradas. O protocolo utilizado demonstrou-se eficaz na amplificação de DNA das amostras frescas e das lâminas, com sensibilidade de 75%, similar à de estudos anteriores. Resultados parciais sugerem prevalência de linfomas de células B (60%) sobre células T (40%). O presente estudo abre precedentes para uma série de novos estudos com diagnóstico molecular de linfomas.(AU)
Assuntos
Animais , Cães , Linfoma/classificação , Linfoma/veterinária , Receptores de Antígenos , Receptores de Antígenos de Linfócitos T gama-delta , Técnicas de Diagnóstico Molecular/veterináriaRESUMO
No abstract available.
Assuntos
Pré-Escolar , Feminino , Humanos , Citometria de Fluxo , Hidroa Vaciniforme/diagnóstico , Imunofenotipagem , Linfocitose/complicações , Linfoma/diagnóstico , Receptores de Antígenos de Linfócitos T gama-delta/genética , Fator de Transcrição STAT3/genética , Análise de Sequência de DNA , Pele/metabolismo , Linfócitos T/metabolismoRESUMO
Background: A secular trend towards a younger age of puberty onset has been reported in Chilean girls. Aim: To evaluate the age of onset of puberty and prevalence of early puberty in Chilean boys. Material and Methods: A pediatric endocrinologist examined 319 children attending schools in central Santiago. Pubertal development was assessed by testicular volume (TV) and genital inspection (GI) using Tanner graduation. Precocious and early puberty development was diagnosed if TV ≥ 4 ml or GI > stage 2 occurred in boys younger than 9 years and at 9-10 years of age, respectively. Results: Pubertal onset occurred at 10.2 ± 1.5 years according to TV and at 11.1 ± 1.6 years according to GI (p < 0.01). Before the age of nine, 15.2% of children had a VT ≥ 4 ml, 3% had genital changes in GI and only 3% had both changes simultaneously. Early puberty was observed in 23.8% of children according to TV and 9.5% according to GI. However, no child of less than 11 years old had a TV ≥ 4 ml, genital changes and pubic hair simultaneously. Late pubertal stages occurred at the same age according to both criteria used. Body mass index z score was not associated with the age of pubertal onset. Conclusions: Testicular enlargement occurs one year earlier than changes in genitalia according to inspection. Testicular growth, but not late stages of puberty, are occurring one year earlier than previously reported in Chile 10 years ago.
Assuntos
Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Apresentação de Antígeno , /imunologia , /imunologia , Diferenciação Celular/imunologia , Apresentação Cruzada , Bactérias Gram-Negativas/imunologia , Bactérias Gram-Positivas/imunologia , Imunidade Adaptativa , /patologia , /patologia , Imunidade Inata , Neutrófilos , Receptores de Antígenos de Linfócitos T gama-delta/imunologiaRESUMO
No abstract available.
Assuntos
Feminino , Humanos , Pessoa de Meia-Idade , Anticorpos Monoclonais Murinos/uso terapêutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Fator de Transcrição PAX5/metabolismo , Medula Óssea/metabolismo , Ciclofosfamida/uso terapêutico , Doxorrubicina/uso terapêutico , Endoscopia do Sistema Digestório , Rearranjo Gênico da Cadeia gama dos Receptores de Antígenos dos Linfócitos T , Loci Gênicos , Fígado/metabolismo , Linfócitos/citologia , Linfoma Difuso de Grandes Células B/complicações , Linfoma de Células T Periférico/complicações , Prednisona/uso terapêutico , Receptores de Antígenos de Linfócitos T gama-delta/genética , Tomografia Computadorizada por Raios X , Vincristina/uso terapêuticoRESUMO
No abstract available.
Assuntos
Idoso , Humanos , Masculino , Leucemia Plasmocitária/complicações , Leucocitose , Linfonodos/patologia , Linfoma de Células T/complicações , Paraproteinemias/complicações , Reação em Cadeia da Polimerase , Receptores de Antígenos de Linfócitos T gama-delta/genética , Tomografia Computadorizada por Raios XRESUMO
<p><b>OBJECTIVE</b>To investigate the role played by γδ T cells in acute liver injury using the concanavalin A (ConA)-induced liver injury mouse model.</p><p><b>METHODS</b>Acute liver injury was induced by intravenous injection of 10 mug/g of ConA into male C57BL/6J mice with wild-type or T cell receptor-γ knockout (TCR δ-/-) genetic backgrounds. Mice injected with PBS alone served as negative controls. The degree of liver damage was assessed by measuring serum levels of transaminase and cytokines at post-injection hours 3, 6, 12, 24, 48, and 72. The percentage of γδ T cells and proportions of different subsets in liver lymphocytes were measured by flow cytometry.</p><p><b>RESULTS</b>The TCR δ-/- mice showed significantly higher levels of the inflammatory cytokines IFN-γ, TNFα and IL-4 than the wild-type mice at post-injection hour 3. The percentage of liver γδ T cells increased with increased injury degree, and the extent of increase was significantly higher in the TCR δ-/- mice than the wild-type mice (post-injection hour 6: 6302.61+/-592.06 vs. 1319.26+/-355.48, 12: 6569.44+/-1060.98 vs. 3415.53+/-343.90, 24: 6514.29+/-757.26 vs. 2062.73+/-365.67, 48: 1262.61+/-558.07 vs. 113.66+/-113.26, and 72: 226.54+/-98.20 vs. 42.35+/-21.51 U/L; all P less than 0.05). In addition, compared to the negative control mice, the ConA-induced mice showed a higher proportions of Vγ4 γδ T cells to total γδ T cells (17.78+/-2.95 vs. 25.26+/-2.43) and to total liver lymphocytes (0.47+/-0.07 vs. 0.66+/-0.05). Similarly, compared to the negative control mice, the ConA-induced mice showed a higher proportion of Vγ1 γδ T cells to total γδ T cells (38.37+/-6.10 vs. 50.19+/-5.52) but the proportion to total liver lymphocytes was not significantly different among the groups (0.76+/-0.18 vs. 0.78+/-0.25). Reinfusion of Vγ4 γδ T lymphocytes into TCR δ-/- mice led to lower serum ALT levels than reinfusion of Vγ1 γδ T lymphocytes (5054.10+/-1748.51 vs. 12333.56+/-663.535 U/L).</p><p><b>CONCLUSION</b>γδ T cells play a protective role in ConA-induced liver injury and this effect maybe mediated by the Vγ4 γδ T cell subset.</p>
Assuntos
Animais , Masculino , Camundongos , Doença Hepática Induzida por Substâncias e Drogas , Alergia e Imunologia , Patologia , Concanavalina A , Toxicidade , Interferon gama , Alergia e Imunologia , Interleucina-4 , Alergia e Imunologia , Fígado , Alergia e Imunologia , Patologia , Camundongos Endogâmicos C57BL , Receptores de Antígenos de Linfócitos T gama-delta , Metabolismo , Subpopulações de Linfócitos T , Alergia e Imunologia , Fator de Necrose Tumoral alfa , Alergia e ImunologiaRESUMO
Inflammatory bowel diseases(IBD), including Crohn's disease and ulcerative colitis, are chronic inflammatory states of the intestinal tract. While the exact mechanisms inducing chronic inflammation are still unclear, it is hypothesized that the inflammation is caused in part by an inappropriate immune response to the intestinal microflora. Although inflammatory diseases are not directly linked to patient survival, symptoms of these diseases significantly decrease quality of life. The incidence rate is higher in western people than eastern people, but the incidence rate of IBD in eastern people, including Korean, is increasing. Recently, it has been reported that IL-17 is an important factor that appears to be involved in IBD induction and progression. This report reviews many recent papers reporting the relationship between IBD and IL-17, which may provide an understanding leading to new means of prevention and treatment for IBD.
Assuntos
Humanos , Colite , Colite Ulcerativa , Doença de Crohn , Incidência , Inflamação , Doenças Inflamatórias Intestinais , Interleucina-17 , Qualidade de Vida , Receptores de Antígenos de Linfócitos T gama-delta , Células Th17RESUMO
<p><b>OBJECTIVE</b>To investigate the cytotoxic effect of γδ T cells from osteosarcoma patients against interferon-γ (IFN-γ)-treated osteosarcoma cells in vitro.</p><p><b>METHODS</b>Human γδ T cells were amplified by zoledronate from peripheral blood cells of osteosarcoma patients. The expression of Fas on the osteosarcoma cells were measured by flow cytometry and quantitative real-time PCR analysis before and after IFN-γ treatment. The cytotoxicity of γδ T cells against osteosarcoma cells was evaluated with LDH assay.</p><p><b>RESULTS</b>IFN-γ significantly enhanced the susceptibility of the osteosarcoma cell lines HOS and U2OS to the cytotoxicity of γDelta; T cells from osteosarcoma patients (P<0.01). IFN-γ obviously up-regulated the expression of Fas in HOS and U2OS cells (P<0.01). Anti-FasL mAb failed to inhibit the cytotoxicity of γδ T cells in untreated osteosarcoma targets (P>0.05), but significantly impaired γδ T cell cytotoxicity in IFN-γ pre-treated osteosarcoma targets (P<0.01).</p><p><b>CONCLUSION</b>IFN-γ can enhance the cytotoxic effect of human γδ T cells from osteosarcoma patients against osteosarcoma cells in vitro.</p>
Assuntos
Humanos , Neoplasias Ósseas , Metabolismo , Linhagem Celular Tumoral , Citotoxicidade Imunológica , Interferon gama , Farmacologia , Osteossarcoma , Alergia e Imunologia , Metabolismo , Receptores de Antígenos de Linfócitos T gama-delta , Alergia e Imunologia , Linfócitos T Citotóxicos , Biologia Celular , Alergia e Imunologia , Receptor fas , MetabolismoRESUMO
This study was aimed to investigate the immunogenetic diagnosis of large granular lymphocytic leukemia (LGLL) and therapeutic efficacy of sirolimus, and to analysis 256 cases of LGLL reported at home and abroad within 2000 - 2010. Besides the routine examination of peripheral blood and classification of bone marrow cell morphology, the expression of T cell receptor variable region of β-chain (TCR BV), CD3, CD4 and CD8, as well as TCRαβ, TCRγδ were detected by flow cytometry; the RT-PCR was used to amplify and determine the TCR gene spectrotypes, and to analyze the clonality of abnormal cells. Sirolimus was first given to patients who did not gain efficacy from common agents. The results showed that lymphocytosis happened in all LGLL patients, but patients from West countries always displayed neutropenia while Chinese patients always displayed anemia. In 2 out of 4 patients from our hospital, the large granular lymphocytes (LGL) were difficult to be distinguished. In all 4 patients, almost all lymphocytes were CD3(+), CD8(+), and TCRα/β(+). TCR BV 24 gene family clones showed monoclonal TRBV 23, TRBV 20, TRBV 13.6, and TRBV 13.6, respectively. FCM results were consistent with those of RT-PCR. When 4 patients had been given sirolimus (6 mg first dose, 2 mg once a day) for about 1 week, hemoglobin level and reticulocyte count increased significantly without any serious side effects. It is concluded that the detection of specific lymphocyte monoclonal TCR BV 24 gene family by FCM contributes to the diagnosis of LGLL. Sirolimus is an effective agent without serious side effect for LGLL patients, especially for patients who cannot tolerate common drugs.
Assuntos
Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Citometria de Fluxo , Imunogenética , Leucemia Linfocítica Granular Grande , Diagnóstico , Tratamento Farmacológico , Receptores de Antígenos de Linfócitos T alfa-beta , Genética , Receptores de Antígenos de Linfócitos T gama-delta , Genética , Sirolimo , Usos Terapêuticos , Resultado do TratamentoRESUMO
<p><b>OBJECTIVE</b>To find out the more efficient induction method through investigating the expansion efficiencies of HIV-infected patients' Vdelta2 T cells induced by zoledronic acid (Zol) or gammadelta TCR monoclonal antibody (mAb).</p><p><b>METHODS</b>38 healthy control subjects (HC group) and 65 HIV infected patients (HIV group) were enrolled in this research. Peripheral blood mononuclear cells (PBMCs) of individuals were stimulated by Zol or gammadelta TCR mAb respectively for 14 days at 2.0 x 10(7) cells/ well, and then gammadelta T cells and Vdelta2 subsets frequencies were measured by flow cytometry (FCM) on 0, 7 and 14 day. The absolute numbers of Vdelta2 T cells were calculated and the Vdelta2 T cell expansion efficiencies by these two methods were compared.</p><p><b>RESULTS</b>The absolute numbers and frequencies of Vdelta2 T cell of HIV groups were lower than those of HC groups significantly on 0 day. After 14 days, the frequencies of Vdelta2 T cell of HIV group and HC group were(17.6 +/- 19.8)% and(64.3 +/- 4.5)% respectively, and the expansion indexes of Vdelta2 T cell were 54 +/- 40 and 74 +/- 29 respectively by induction of gammadelta TCR mAb. However, the frequencies of Vgammadelta2 T cell of HIV group and HC group were (69.6 +/- 21.2)% and (97.3 +/- 1.7)% respectively, and the Vgammadelta2 T cell expansion indexes were 538 +/- 11 and 5984 +/- 721 respectively by induction of Zol.</p><p><b>CONCLUSION</b>Zol could induce the vast expansion of Vgammadelta2 T cells of HIV infected patients. The expansion efficiency by Zol was better than that by the gammadelta TCR mAb.</p>
Assuntos
Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Anticorpos Monoclonais , Farmacologia , Estudos de Casos e Controles , Proliferação de Células , Células Cultivadas , Difosfonatos , Farmacologia , Citometria de Fluxo , Infecções por HIV , Alergia e Imunologia , Virologia , Imidazóis , Farmacologia , Leucócitos Mononucleares , Alergia e Imunologia , Contagem de Linfócitos , Receptores de Antígenos de Linfócitos T gama-delta , Alergia e Imunologia , Subpopulações de Linfócitos T , Biologia CelularRESUMO
Background & objectives: The unique immunological functions of γδ T lymphocytes to contribute immunity against Mycobacterium tuberculosis attracted interest of researchers. However, little is known about the specificity of γδ Τ cell in tuberculosis patients and the lack of exact tuberculosis antigen recognized by γδ T cells limited its application. The analysis of complementary determinant region (CDR)3 sequence characteristic in γδ T cells of tuberculosis patients would contribute to understand the distribution specificity of γδ T cell. In present study, we investigated the diversity of the γ9/δ2 T cell immunorepertoire and analysed the specificity of the expressed CDR3 in pulmonary tuberculosis patients. Methods: The total RNA in peripheral blood mononuclear cell of 50 pulmonary tuberculosis patients and 10 healthy controls was extracted. The polymerase chain reaction was used to specifically amplify the CDR3 region of γ9 and δ2 chain. The PCR products were ligated into the pGEM-T easy vector. The plasmid DNA was sequenced using the ABI3700 and the T7 primer. Results: Our findings showed that predominant CDR3 sequence of δ2 chain in pulmonary tuberculosis patients was CACDTLVSTDKLIFGKG. The sequence specifically exists in almost all pulmonary tuberculosis patients. The conserved hydrophobic acid residue in 97 positions is present in the γδ T cell reactive to M. tuberculosis. The length of δ2 CDR3 in pulmonary tuberculosis patients has no relation with the disease progress. Interpretation & conclusions: Our results suggest that γδ T cells appear to use CDR3 sequence to recognise M. tuberculosis antigen. γδ T cells reactive to M. tuberculosis were diverse and polyclonal.
Assuntos
Motivos de Aminoácidos/genética , Regiões Determinantes de Complementaridade/metabolismo , Primers do DNA/genética , Feminino , Vetores Genéticos , Humanos , Masculino , Dados de Sequência Molecular , Mycobacterium tuberculosis/imunologia , Reação em Cadeia da Polimerase , Receptores de Antígenos de Linfócitos T gama-delta/imunologia , Receptores de Antígenos de Linfócitos T gama-delta/metabolismo , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Análise de Sequência de DNA , Linfócitos T/imunologia , Linfócitos T/metabolismo , Tuberculose Pulmonar/imunologiaRESUMO
<p><b>OBJECTIVE</b>To investigate the distribution and clonality of T cell receptor (TCR) Vγ and Vδ subfamily in peripheral blood of patients with allergic rhinitis before and after 1 year treatment with immunotherapy.</p><p><b>METHODS</b>The specific IgE and the complementary determinant region 3 (CDR3) of TCR V γ (I-III) and Vδ(1-8) subfamily genes in mononuclear cells were amplified from 10 effective cases of allergic rhinitis before and after 1 year treatment with immunotherapy, to observe the distribution and utilization of TCR Vγ and Vδ repertoire. The positive PCR products were further labeled with RT-PCR and analyzed by gene scan technique to determine the CDR3 size and evaluate the clonality of the detectable TCR Vγ and Vδ T cells. Peripheral blood of 10 healthy adults served as controls.</p><p><b>RESULTS</b>All symptoms were significantly improved after 1 year specific immunotherapy, but no changes were seen in specific IgE [(22.89 ± 9.60) kU/L before treatment, (19.62 ± 7.63) kU/L after treatment, Z = 1.051, P > 0.05]. No statistically significant differences of expression levels of the TCR Vγ I-III subfamily genes were found between patients with allergic rhinitis normal control group (t value were -0.679, -0.516, -0.808, all P > 0.05), but significantly decreased after 1 year treatment. There were statistically significant differences of expression levels of the TCR VγI-II subfamily genes before and after treatment (t value were -2.904, -2.217, all P < 0.05). 5.30 ± 0.82, 4.90 ± 0.57 and 5.20 ± 1.40 out of TCR Vδ (1-8) subfamilies were selectively expressed in T cells in patients with allergic rhinitis before and after 1 year treatment and normal control group, predominantly for TCR Vδ 1, 2, 3 and 6. The TCR Vδ 6 subfamily was found to have statistically significant differences in these groups (Fisher's Exact Test, P < 0.05). Compared with the normal control group and the allergic rhinitis group before treatment, a significant higher frequency of Vδ 6 oligoclonal was identified in T cells in patients with allergic rhinitis after 1 year treatment.</p><p><b>CONCLUSIONS</b>There was difference in the expression levels of the TCR Vγ I-III subfamily genes and distribution and clonality of TCR Vγ and Vδ subfamily T cells in peripheral blood of patients with allergic rhinitis before and after 1 year treatment. Specific immunotherapy can be effective in alleviation of the symptom in patients with allergic rhinitis during the early stage, possibly by inducing TCR γδ T cells, especially the TCR Vδ6 subfamily, and possibly no significant relativity between symptom and specific IgE.</p>