CD4 and CD8 cells in gastric mucosa from AIDS patients with gastritis infected by Helicobacter pylori / 中华微生物学和免疫学杂志

Objective To investigate the relationship among Helicobacter pylori(H.pylori),CD4 positive cells and CD8 positive cells in gastric mucosa of the AIDS patients with gastritis.Methods Fiftyeight AIDS patients with upper abdominal pain were diagnosed with chronic gastritis through gastroscopy.The gastric biopsies from them were used for H.pylori detection with rapid urease test and Giemsa staining,pathology examination with HE staining,and immunohistochemistry analysis for CD4,CD8 positive cells in Gastric mucosa.And the application of flow cytometry was for the detection of peripheral blood CD4 and CD8 lymphocytes from the patients.Results H.pylori was positive in 26 cases,and negative was in 32 cases.CD8 cell expression in gastric mucosa of the AIDS patients with H.pylori positive was significantly higher than H.pylori negative patients(P＜0.05).There is no difference CD4 cell expression in gastric mucosa between the AIDS patients with H.pylori positive and H.pylori negative patients.Moreover,CD8 positive lymphocytes in gastric mucosa of those patients with H.pyloriinfection were significantly stronger than the CD4 positive lymphocytes.However,the peripheral blood CD4 lymphocytes from the patients with H.pylori infection were more than those from H.pylorinegative patients significantly(P＜0.05).Conclusion The expression level of CD8 cells in gastric mucosal tissues of AIDS patients with H.pylori infection were higher than those without H.pylori infection.The CD4 lymphocytes from the peripheral blood of the patients with H.pylori infection were more than those without H.pylori negative patients.

Current practices in laboratory monitoring of HIV infection.

After a diagnosis of HIV infection is made, the patient needs to be monitored using both clinical assessment and laboratory markers. HIV/AIDS monitoring is essential in guiding when to recommend initiation of therapy. Clinical monitoring will include staging of the HIV/AIDS disease using either the presence or absence of HIV-related signs and symptoms using the WHO staging system. Various laboratory methods can be used to monitor the disease progression and to guide whether the patient will need antiretroviral therapy or not. Laboratory monitoring for patients who are not on drugs is done to provide information about the stage of illness; to enable the clinician to make decisions on treatment and to give information on prognosis of the patient. Patients on drugs are monitored to assess their response to treatment with antiretroviral drugs and to detect any possible toxicity and improvement associated with the antiretroviral drugs.

IL-21 level in Chinese HIV infected individuals and its dynamics undergoing HAART / 中南大学学报(医学版)

To investigate the dynamics of interleukin-21 (IL-21) cytokine in the Chinese HIV patients undergoing highly active antiretroviral therapy (HAAPT).Methods A total of 25 adults with chronic HIV infections,responding to combined highly active antiretroviral therapy (HAART) guideline criteria were enrolled for a 1-year follow-up.After signing an informed consent,20 mL blood was collected from each patient at the base line,6 month and 12 month,respectively.CD4 and CD8 cell count was quantified by flux cytometry,serum HIV RNA quantified by real time PCR and IL-21 concentrations by ELISA.Results IL-21 levels increased gradually during the follow-up but did not reach the healthy levels.IL-21 correlated positively with the CD4 cells but not with CD8 T cells.HIV RNA correlated negatively with CD4 cell count but did not show any relationship with the CD8 cells.Conclusion IL-21 has potential role in the immunopathogenesis of HIV,and might be an important factor in immune construction during HAART.

Tuberculin skin testing in HIV-infected patients in Campo Grande, Mato Grosso do Sul State, Brazil

A cross-sectional study on HIV/AIDS was carried out in 108 outpatients from the university hospital of the Federal University of Mato Grosso do Sul, Campo Grande, Brazil, from July to December 2008, to investigate latent tuberculosis infection using the tuberculin skin test (TST). The prevalence of positive results was 13.9 percent. The CD4+ T cell count (p = 0.091) and the diagnosis time (p = 0.010) were statistically significant when compared with TST positivity. In the cohort of HIV/AIDS patients who had latent tuberculosis infection, the median diagnosis time was eight years. Undetectable viral load presented significant association (p = 0.046) with tuberculosis infection. The fact that numerous individuals with HIV/AIDS infection presented a negative reaction to the tuberculin skin test is probably related to alterations in the cellular immune response induced by HIV infection. The tuberculin test is a useful tool for the detection of latent tuberculosis infection and should be performed in all HIV/AIDS individuals at the time of the diagnosis and on a yearly basis, if negative. Both the early identification of the tuberculosis infection by the tuberculin skin test at the moment of immunological restoration and chemoprophylaxis in infected individuals are mechanisms to control HIV/AIDS and tuberculosis coinfection.

Relationship between T cell subset and clinical characteristics in bronchlal asthma / 천식및알레르기

BACKGROUND AND OBJECTIVE: T cells play a pivotal role in initiating and orchestrating bronchial inflammation in asthma. However, little is known about changes in T cell subset in the airways. Our objective was to study whether the proportion of CD4+ or CD8+ T cells in the bronchoa1veolar lavage fluid (BALF) of bronchial asthma is different from normal subjects, and whether it is associated with clinical characteristics. METHODS: We examined the percentage of CD4+ and CD8+ cells in the BALF of 37 patients with bronchial asthma and 14 normal controls by flow cytometry. Bronchial asthma was classified as mild, moderate and severe according to bronchial hyperresponsiveness. Skin prick test and pulmonary function tests were performed. RESULTS: The percentage of CD4+ cells in BALF did not differ between asthmatics and controls, however, the percentage of CD8+ cells was significantly higher in asthmatics than contro1s, In asthmatics, the percentage of CD4+ cells and CD8+ cells did not differ between atopic and nonatopic asthmatics. The percentage of CD8+ cells in addition to CD4+ cells was correlated with the percentage of eosinophils in BALF, and the percentage of CD8+ cells also showed negative correlation with FEV, and FEF25-75% CONCLUSION: These results suggest that CD8+ cells as well as CD4+ cells are associated with airway inflammation in bronchial asthma.

Lymphocyte Subsets in Patients with Hepatitis B Virus Associated Glomerulonephritis / 대한신장학회잡지

Immune complex formation has been recently emphasized as an important pathogenetic mechanism of hepatitis B virus associated glomerulonephritis (HBGN), but little are known on the role of cell- mediated immunity in that disease. In this study, we measured lymphocyte subsets of the blood samples from three groups(HBGN group, healthy control group, hepatitis B group without renal disease) by flow cytometry in order to clarify abnormalities in immune regulatory system of HBGN. The results were as follows: 1) To compare between HBGN and healthy control group, the proportion of CD4+ cells were higher for HBGN than for healthy control but that of B lymphocytes were lower for HBGN than for healthy control. Between HBGN and hepatitis B group without renal disease, the proportion of B lymphocytes were higher for HBGN but that of NK cells were lower for HBGN(P<0.05). 2) To compare the male data of the three groups, the percentage of CD4+ cells in HBGN group were higher and the percentage of B lymphocytes were lower than healthy control. Between HBGN group and hepatitis B group without renal disease, no significant difference were noted in CD4+ cells, CD8+ cells, B lymphocytes, NK cells and CD4/CD8 ratio (P<0.05). 3) HBGN patients with membraneous nephropathy (MN) showed higher proportion of CD4+ cells than those with membranoproliferative glomerulonephritis (MPGN)(P<0.05). But, no difference was observed between HBGN patients with and without nephrotic syndrome. Nor between HBGN patients with and without HBe antigenemia. In conclusion, above result implies the pathogenetic role of cell-mediated immunity in HBGN. Analysis of lymphocyte subsets for each stage of HBGN, together with the assay of lymphocyte activation markers is required in the future.

Immunohistochemical Study of CD4 , CD8 ICAM-1 and LFA-1 in Experimental Uveitis

We have reported an animal model of human anterior uveitis in Lewis rats with bovine melanin associated antigen[BMAA] which has been named as experimental autoimmune anterior uveitis[EAAU]. Immunopathogenesis in this model during different clinical stages was examined by the immunohistochemical detection of CD4 , CD8 , ICAM-1 and LAF-1 which play an important role in immune and inflammatory response. After the separation of eyes, these eyes were sectioned by cryostat at 6micrometer thick sections and stored at -70degreesC. For immunohistochemical study monoclonal antibodies to CD4, CD8, ICAM-1, and LAF-1 were used. An increase of ICAM-1 expression was shown on the epithelial cells of uveal tissues before clinical sign of uveitis and followed by LFA-1 expression. And there was no staining in retinal pigment epithelium and cornea. In conclusion, the immunopathogenesis of EAAU appears to be mediated by T cells and cells expressing ICAM-1, LFA-1.

Healthy subjects distinguishable as CD 8-meddiators and non-mediators for capabilty of diminishing trichosanthin induced immune suppression after depleting or blocking CD 8~+ cells / 中国免疫学杂志

Trichosanthin (Tk), a crystal plant protein isolated and purified from root tubes of a Chinese medicinal herb Trichosanthes kiritowii Maxim (Cucurbitaceae), was demonstrated to be capable of inducing immune suppression in man, and the suppression could be eased up by depleting the culture of CD 8~+ cells with monoclonal anti bodies as reported in our previous work (1). This paper desc ribes that the diminition of suppression,or the restoration of low- responsiveness, however, was restricted in certain subjects we studied. For the others, the suppression kept unchanged or even got more vigorous with the same treatment. For this reason, healthy subjects were categoried as CD 8 -mediators (M~+) and non-mediators (M ~- ). In addition, there were some interesting points revealed as follows. 1 ) M~+ and M~- were determined as a phenotipically stable and reproduceable traits; 2) The difference between two categories can only be observed in the MLR- Tk testing system but not in the non-specific PHA- Tk system in which PHA initiated lymphoproliferation was depressed by T K; 3 ) Instead of stimu lator, only responding PBMC in one-way MLC was affectad by depleting CD8 cells, which resulted in the distinguishable phenotypes of M~+ and M~-; 4) The supernatants collected from Tk sensitized. cultured PBMC could show suppressive activity if the cell donors were M~+, but not M~-.