Immunodeficiency with defective T-cell response to interleukin 1

Area of Science:

• Immunology
• Cell Biology
• Molecular Medicine

Background:

• T-cell proliferation requires interleukin-2 (IL-2), with optimal IL-2 production dependent on interleukin-1 (IL-1).
• Assessing immune function in children with recurrent infections is crucial for identifying underlying immunodeficiencies.

Observation:

• A 10-year-old male presented with recurrent infections, failure to thrive, and impaired T-cell proliferation in response to mitogens and antigens.
• The patient exhibited normal immunoglobulin levels, T-cell subsets, monocyte function, and IL-1 production, but showed a deficient T-cell response to IL-1 and severely reduced IL-2 production.

Findings:

• The patient's peripheral blood mononuclear cells (PBMC) showed a depressed proliferative response to phytohemagglutinin and absent response to antigens.
• Addition of exogenous IL-2 corrected the phytohemagglutinin response, while phorbol 12-myristate 13-acetate corrected IL-2 production, indicating a defective T-cell response to IL-1.
• T-cell blasts from the patient did not absorb IL-1 activity, unlike those from a normal subject, confirming a specific defect in IL-1 responsiveness.

Implications:

• This case demonstrates a T-cell deficiency caused by a defective T-cell response to IL-1.
• The findings underscore the critical role of IL-1 in mediating T-cell responses and overall in vivo immune function.
• Understanding IL-1's role is vital for diagnosing and potentially treating T-cell related immunodeficiencies.