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Updated: Jun 3, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
Published on: June 13, 2014
Epithelial adhesion molecules can inhibit HIV-1-specific CD8⁺ T-cell functions
Hendrik Streeck1, Douglas S Kwon, Augustine Pyo
1Ragon Institute of MGH, MIT, and Harvard, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. hstreeck@partners.org
HIV-1 infection increases KLRG1 expression on CD8+ T cells. Systemic soluble E-cadherin, linked to gut damage, impairs these T cells
Area of Science:
- Immunology
- Virology
- Cellular Biology
Background:
- Persistent antigenic stimulation leads to T cell dysfunction and upregulation of inhibitory receptors like killer lectin-like receptor G1 (KLRG1).
- HIV-1 infection is characterized by chronic immune activation and T cell exhaustion.
Purpose of the Study:
- To investigate the role of KLRG1 and its ligand E-cadherin in HIV-1-specific CD8+ T cell dysfunction during chronic infection.
- To explore the link between intestinal barrier disruption and T cell impairment in HIV-1.
Main Methods:
- Quantification of KLRG1 expression on HIV-1-specific CD8+ T cells.
- Analysis of E-cadherin distribution in intestinal mucosa and systemic soluble E-cadherin (sE-cadherin) levels.
- In vitro assessment of KLRG1(hi) CD8+ T cell function in the presence of sE-cadherin.
Main Results:
- HIV-1-specific CD8+ T cells from chronically infected individuals showed significantly elevated KLRG1 expression.
- Abnormal E-cadherin distribution was observed in the intestinal mucosa, with elevated systemic sE-cadherin correlating with HIV-1 viral load.
- In vitro, sE-cadherin impaired the cytokine secretion and viral inhibition capacity of KLRG1(hi) HIV-1-specific CD8+ T cells.
Conclusions:
- HIV-1-associated disruption of the intestinal epithelium increases systemic sE-cadherin levels.
- Elevated sE-cadherin inhibits effector functions of KLRG1(hi)-expressing HIV-1-specific CD8+ T cells.
- This mechanism contributes to CD8+ T cell dysfunction in chronic progressive HIV-1 infection.
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