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Related Experiment Videos

Electronmicroscopic study on biopsied rectal mucosa in adrenoleukodystrophy.

K Tanaka, T Yamano, M Shimada

    Neurology
    |June 1, 1987
    PubMed
    Summary

    Rectal biopsies revealed characteristic inclusions in histiocytes, confirming adrenoleukodystrophy (ALD) in affected individuals. These ultrastructural findings were also present in presymptomatic cases, aiding early diagnosis of ALD.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Neurology

    Background:

    • Adrenoleukodystrophy (ALD) is a rare genetic disorder affecting the adrenal cortex, brain, and spinal cord.
    • The disease is characterized by the accumulation of very-long-chain fatty acids (VLCFAs).
    • Diagnosis often relies on biochemical assays and neuroimaging, but early detection can be challenging.

    Purpose of the Study:

    • To investigate the presence of ultrastructural abnormalities in rectal mucosal biopsies of patients with ALD.
    • To determine if these abnormalities can aid in the diagnosis of ALD, including presymptomatic cases.

    Main Methods:

    • Rectal mucosal biopsies were obtained from seven individuals across five families with diagnosed ALD.
    • Ultrastructural analysis was performed on the biopsies to identify characteristic cytoplasmic lamellar inclusions.

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  • Biochemical assays for very-long-chain fatty acids were used to confirm presymptomatic ALD.

    • Main Results:

    • Characteristic cytoplasmic lamellar inclusions were identified in histiocytes within the rectal biopsies.
    • These inclusions were ultrastructurally identical to those observed in adrenocortical cells, brain macrophages, and Schwann cells of ALD patients.
    • The same ultrastructural features were present in two asymptomatic individuals who were diagnosed with presymptomatic ALD via VLCFA assays.

    Conclusions:

    • Rectal mucosal biopsy is a viable diagnostic tool for identifying ultrastructural hallmarks of ALD.
    • The presence of characteristic lamellar inclusions in rectal histiocytes can indicate ALD, even in presymptomatic stages.
    • This finding may offer a novel approach for early detection and management of adrenoleukodystrophy.