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Murine postthymectomy autoimmune oophoritis develops in association with a persistent neonatal-like Th2 response
1Developmental Endocrinology Branch, NICHD, NIH, Bethesda, Maryland 20892, USA.
Clinical Immunology and Immunopathology
|June 1, 1997
Summary
Neonatal thymectomy disrupts T helper cell balance, leading to autoimmune oophoritis. Restoring the normal Th1/Th2 balance ameliorates this condition, suggesting a thymus-dependent process.
Area of Science:
- Immunology
- Endocrinology
- Developmental Biology
Background:
- Autoimmune oophoritis can occur despite impaired cellular immunity.
- The role of T helper cell regulation in autoimmune oophoritis is not fully understood.
Purpose of the Study:
- To investigate if neonatal thymectomy induces autoimmune oophoritis by disrupting T helper cell regulation.
- To examine the impact of neonatal thymectomy on the postnatal shift in T helper cell balance.
Main Methods:
- Utilizing a murine postthymectomy model of autoimmune oophoritis.
- Analyzing CD4+ splenic lymphocyte responses (interleukin-4 and interferon-gamma levels) in neonatally thymectomized and sham-operated adult mice.
- Evaluating the effect of restoring Th1/Th2 balance on autoimmune oophoritis.
Main Results:
- Neonatally thymectomized mice exhibited a persistent neonatal-like Th2-predominant response (high IL-4, low IFN-gamma).
- Sham-operated mice showed a normal adult Th1-predominant response (low IL-4, high IFN-gamma).
- Restoring the postnatal shift to a Th1-dominant pattern ameliorated autoimmune oophoritis.
Conclusions:
- Neonatal thymectomy abrogates the normal postnatal shift to a Th1-dominant T helper cell pattern.
- A persistent Th2-dominant response is associated with postthymectomy autoimmune oophoritis.
- The findings suggest a thymus-dependent process establishes adult Th1/Th2 balance and implicate potential genetic defects in autoimmune polyglandular failure.