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Thymic deficiency in Down's syndrome.

S Levin, M Schlesinger, Z Handzel

|January 1, 1979

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Children with Down's syndrome exhibit thymic abnormalities and impaired T-cell immunity, increasing susceptibility to infections and leukemia. This highlights immune dysfunction in DS, impacting T-cell numbers and function.

Area of Science:

Immunology
Pediatrics
Genetics

Background:

Children with Down's syndrome (DS) often present with thymic abnormalities, including small size, lymphocyte depletion, and altered structure, resembling premature aging (involution).
These thymic changes are associated with increased respiratory infections and a higher incidence of lymphatic leukemia in individuals with DS.
Existing research indicates deficiencies in cell-mediated immunity within the DS population.

Purpose of the Study:

To investigate the immunological characteristics of the thymus in children with Down's syndrome.
To correlate thymic abnormalities with immune deficiencies observed in DS patients.

Main Methods:

Histopathological examination of thymic tissue from children with Down's syndrome.

Related Experiment Videos

Assessment of lymphocyte populations and T-cell function in affected individuals.

Main Results:

Observed thymic abnormalities include lymphocyte depletion, cortical diminution, and loss of corticomedullary demarcation, mimicking thymic involution.
Markedly enlarged Hassall's corpuscles were noted, occasionally surrounded by lymphocytes.
Children with DS demonstrated both reduced numbers of T cells and functional deficiencies in cell-mediated immunity.

Conclusions:

The thymus in Down's syndrome exhibits significant structural abnormalities contributing to immune system deficits.
These thymic and T-cell deficiencies likely underlie the increased susceptibility to infections and lymphatic leukemia in children with DS.