A decrease of regulatory T cells and altered expression of NK receptors are observed in subacute sclerosing...

Area of Science:

• Immunology
• Virology
• Neurology

Background:

• Subacute sclerosing panencephalitis (SSPE) results from persistent measles virus infection.
• Impaired immunosurveillance in children with SSPE may stem from regulatory mechanism failures.

Purpose of the Study:

• To compare peripheral blood cell phenotypes between SSPE patients and controls.
• To investigate immune cell alterations in SSPE, focusing on T cells and NK cells.

Main Methods:

• Phenotypic analysis of peripheral blood cells from 71 SSPE patients and 57 controls.
• Flow cytometry was used to quantify proportions of CD3(+), CD4(+), CD8(+), NK, and regulatory T cells (Treg).
• Expression of NKG2A and NKG2C receptors on CD8(+) T cells and NK cells was analyzed.

Main Results:

• Total CD3(+) T cells and regulatory T cells (Treg) were decreased in SSPE patients.
• The proportion of CD8(+) T cells expressing inhibitory NKG2A was reduced in SSPE.
• NK cells expressing activating NKG2C were increased in SSPE patients compared to controls.

Conclusions:

• Decreased regulatory cells and altered NK receptor expression suggest an upregulated immune response in SSPE.
• Chronic viral antigen stimulation may drive these immune alterations and dysregulate immune pathways in SSPE.