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Published on: November 22, 2011
Increased expression of interferon-gamma in hyperplastic lymph nodes from HIV-infected patients
M J Boyle1, M F Berger, M Tschuchnigg
1Centre for Immunology, St. Vincent's Hospital, Sydney, Australia.
Insights
HIV infection causes polyclonal B cell activation and CD4+ lymphocyte depletion. This study found higher interferon-gamma (IFN-gamma) gene expression in HIV-associated persistent generalized lymphadenopathy syndrome (PGL) lymph nodes compared to controls.
Area of Science:
- Immunology
- Virology
- Pathology
Background:
- Polyclonal B cell activation and CD4+ lymphocyte depletion are hallmarks of HIV infection.
- CD4+ lymphocytes are the primary T cells in lymphoid tissues of non-HIV-infected individuals.
Purpose of the Study:
- To investigate cytokine gene expression in lymph node biopsies from HIV-infected patients with persistent generalized lymphadenopathy syndrome (PGL).
- To compare cytokine profiles between HIV-infected PGL patients and non-HIV-infected individuals with reactive adenopathy.
Main Methods:
- Gene expression analysis of IL-1 beta, IL-2, IL-4, IL-6, IL-10, interferon-gamma (IFN-gamma), and TNF-beta using polymerase chain reaction (PCR).
- Assessment of lymph node biopsies from eight HIV-infected PGL patients and two non-HIV-infected controls.
Main Results:
- Significantly stronger IFN-gamma gene expression was observed in PGL samples compared to control tissues.
- Expression levels of other assessed cytokines (IL-2, IL-4, IL-6, IL-10, TNF-beta) were similar between HIV-infected and control groups.
- IFN-gamma may play a crucial role in maintaining lymphadenopathy in HIV-infected individuals.
Conclusions:
- Elevated IFN-gamma expression is a key feature of HIV-associated PGL.
- Sufficient expression of cytokines like IL-2, IL-4, and IL-10 in HIV lymph nodes may facilitate naive B cell recruitment.
- Understanding these cytokine dynamics is vital for managing HIV-related lymphadenopathy.
Abstract:
Polyclonal B cell activation is characteristic of HIV infection and occurs in the presence of severe CD4+ lymphocyte depletion. In contrast, CD4+ lymphocytes are the dominant T cell in the reactive lymphoid tissues of patients not infected with HIV. In this study, lymph node biopsies from eight HIV-infected patients with persistent generalized lymphadenopathy syndrome (PGL) were assessed for IL-1 beta, IL-2, IL-4, IL-6, IL-10, interferon-gamma (IFN-gamma) and tumour necrosis factor-beta (TNF-beta) gene expression using the polymerase chain reaction (PCR). The cytokine gene expression of two cases of reactive adenopathy in patients not infected with HIV was assessed for comparison. IFN-gamma was expressed much more strongly in the PGL samples than in control reactive lymphoid tissues, whereas the other cytokines were expressed to a similar extent in both types of tissues. IFN-gamma may have an important role in maintaining the adenopathy of HIV-infected patients. Expression of cytokines such as IL-2, IL-4 and IL-10 in HIV nodes may be adequate to allow the recruitment of naive B cells to the reactive process.
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