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Updated: Aug 10, 2026
In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
Published on: October 15, 2013
[A pulmonary cellular immunity study in HIV patients]
E Fernández Fabrellas1, E González Constán, M Marín González
1Servicio de Neumología, Hospital Dr. Peset Aleixandre, Valencia.
HIV infection impairs cellular immunity, particularly T CD4 lymphocytes, more severely in the lungs than in the blood. Pulmonary T CD4 depletion can be predicted by blood T CD4 levels in HIV patients.
Area of Science:
- Immunology
- Infectious Diseases
- Pulmonology
Background:
- Cellular immunity, marked by low T CD4 lymphocyte counts, indicates HIV progression.
- Pulmonary T CD4 lymphocyte levels and CD4/CD8 ratios are diminished in HIV patients.
- The cause of high pulmonary disease incidence in HIV patients (local vs. systemic immunity) is unclear.
Purpose of the Study:
- To compare systemic immune disorders in blood samples with local immune responses in bronchoalveolar lavage (BAL) samples from HIV-infected patients.
- To investigate the extent of cellular immunity impairment in the lungs versus the blood of HIV patients.
Main Methods:
- Studied 74 HIV patients hospitalized with acute respiratory disease.
- Utilized fiberoptic bronchoscopy for diagnosis.
- Compared cellular and lymphocytic populations using flow cytometry in blood and BAL samples.
Main Results:
- Total lymphocyte percentages and CD4+ populations were decreased in BAL samples.
- This decrease was more pronounced in patients with blood CD4 levels below 25%.
Conclusions:
- HIV infection causes a greater cellular immunity disorder in the lungs than in the blood.
- Pulmonary T CD4+ lymphocyte depletion can be predicted by their blood levels.
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