Logo Medical Science Monitor

Call: +1.631.470.9640
Mon - Fri 10:00 am - 02:00 pm EST

Contact Us

Logo Medical Science Monitor Logo Medical Science Monitor Logo Medical Science Monitor

01 August 2004

NK1.1 cells are required to control T cell hyperactivity during Trypanosoma cruzi infection

Fabíola Cardillo, Auro Nomizo, Edilberto Postol, José Mengel

Med Sci Monit 2004; 10(8): BR259-267 :: ID: 11729

Abstract

Background:This study evaluated the regulatory function of NK1.1+ cells during Trypanosoma cruzi infection.Material/Methods: Both thymectomized (Tx C57Bl/6) and euthymic C57Bl/6 mice (C57Bl/6) were infected intraperitoneally with the Tulahuen strain. NK1.1[sup]+[/sup] cells were depleted in vivo by anti-NK1.1 mAb. Spleen cells were analyzed by flow cytometry for the expression of CD44 and CD69 on T cells. Supernatants from splenocytes were used to measure nitrite concentration (quantified by Griess reagent). Interleukin 2 and IFN-gamma levels were determined by ELISA. The protocols used herein were approved by the Institutional Committee for Ethics. Student’s t or Kruskal-Wallis tests were applied, as indicated.Results: The number of T cells expressing CD69 increased progressively during T. cruzi infection in NK1.1 cell-depleted C57Bl/6 mice. In spite of an increased early T cell activation during infection, the percentage of CD4[sup]+[/sup] CD44[sup]high[/sup] T cells did not augment in NK1.1 cell-depleted C57Bl/6 mice compared with untreated C57Bl/6 controls. Serum levels of IFN-gamma in anti-NK1.1-treated mice were higher than in non-depleted animals. Con-A-stimulated spleen cell supernatants from NK1.1 cell-depleted animals contained increased levels of IL-2 and nitric oxide (NO) during early infection.Conclusions: After the first week of infection, NO overproduction and high levels of IFN-gamma in anti-NK1.1-tre­ated C57Bl/6 mice appeared to be related to susceptibility and hyperactivation of peripheral T cells. Finally, this study suggests a novel regulatory function of NK1.1[sup]+[/sup] cells during T. cruzi infection. Without NK1.1 cells, T lymphocytes are hyperactivated but do not differentiate to effector/memory T cells in infected C57Bl/6 mice.

Keywords: Antigens, CD - metabolism, Antigens, CD44 - metabolism, Antigens, Differentiation, T-Lymphocyte - metabolism, Interferon Type II - metabolism, Interleukin-2 - metabolism, Killer Cells, Natural - immunology, Nitric Oxide - metabolism, Spleen - immunology, Spleen - parasitology, T-Lymphocytes - immunology, Trypanosoma cruzi - immunology, Antigens, CD - metabolism, Antigens, CD44 - metabolism, Antigens, Differentiation, T-Lymphocyte - metabolism, Interferon-gamma - metabolism, Interleukin-2 - metabolism, Killer Cells, Natural - immunology, Lectins, C-Type, Nitric Oxide - metabolism, Spleen - parasitology, T-Lymphocytes - immunology, Trypanosoma cruzi - immunology

Add Comment 0 Comments

Editorial

01 March 2024 : Editorial  

Editorial: First Regulatory Approvals for CRISPR-Cas9 Therapeutic Gene Editing for Sickle Cell Disease and Transfusion-Dependent β-Thalassemia

Dinah V. Parums

DOI: 10.12659/MSM.944204

Med Sci Monit 2024; 30:e944204

0:00

In Press

15 Jan 2024 : Clinical Research  

Comparison of Modified Shock Index and Shock Index for Predicting Massive Transfusion in Women with Primary...

Med Sci Monit In Press; DOI: 10.12659/MSM.943286  

0:00

15 Jan 2024 : Database Analysis  

Bibliometric Analysis of Brain Stimulation Technologies in Sleep Disorders

Med Sci Monit In Press; DOI: 10.12659/MSM.942687  

15 Jan 2024 : Clinical Research  

Clinical Outcomes of Arthroscopic Surgery in Patients with Gluteal Muscle Contracture: Single-Institution R...

Med Sci Monit In Press; DOI: 10.12659/MSM.942945  

17 Jan 2024 : Laboratory Research  

Impact of Auxiliary Features on Retention of Short Dental Crowns: An In-Vitro Analysis of Box and Groove Pr...

Med Sci Monit In Press; DOI: 10.12659/MSM.943401  

Most Viewed Current Articles

16 May 2023 : Clinical Research  

Electrophysiological Testing for an Auditory Processing Disorder and Reading Performance in 54 School Stude...

DOI :10.12659/MSM.940387

Med Sci Monit 2023; 29:e940387

0:00

17 Jan 2024 : Review article  

Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron Variant

DOI :10.12659/MSM.942799

Med Sci Monit 2024; 30:e942799

0:00

14 Dec 2022 : Clinical Research  

Prevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase Levels

DOI :10.12659/MSM.937990

Med Sci Monit 2022; 28:e937990

0:00

01 Jan 2022 : Editorial  

Editorial: Current Status of Oral Antiviral Drug Treatments for SARS-CoV-2 Infection in Non-Hospitalized Pa...

DOI :10.12659/MSM.935952

Med Sci Monit 2022; 28:e935952

0:00

Your Privacy

We use cookies to ensure the functionality of our website, to personalize content and advertising, to provide social media features, and to analyze our traffic. If you allow us to do so, we also inform our social media, advertising and analysis partners about your use of our website, You can decise for yourself which categories you you want to deny or allow. Please note that based on your settings not all functionalities of the site are available. View our privacy policy.

Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750