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Liver and chorion cytochemistry

F Roels¹, B De Prest, G De Pestel

¹Department of Human Anatomy, Embryology and Histology, University of Gent, Belgium.

Journal of Inherited Metabolic Disease

|January 1, 1995

Summary

Microscopic examination of peroxisomes and enlarged liver macrophages reveals diagnostic features for peroxisomal disorders. These cellular changes, including lipid droplets and trilamellar inclusions, are identifiable in various tissue samples.

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Area of Science:

Cell Biology
Pathology
Microscopy

Background:

Peroxisomal disorders are a group of rare genetic diseases.
Accurate diagnosis relies on identifying specific cellular abnormalities.
Microscopic examination of tissue biopsies is crucial for diagnosis.

Purpose of the Study:

To describe key microscopic features for diagnosing peroxisomal disorders.
To present methods for evaluating these diagnostic structures.
To highlight the diagnostic value of specific cellular inclusions.

Main Methods:

Microscopic visualization of peroxisomes in chorionic villus cytotrophoblast, liver, and kidney samples.
Evaluation of enlarged liver macrophages containing lipid droplets.
Identification of polarizing inclusions formed by trilamellar sheets.
Use of light and electron microscopy for structural analysis.
Assessment of macrophage features in archival paraffin blocks.

Main Results:

Enlarged liver macrophages with lipid droplets insoluble in acetone and n-hexane are diagnostic.
Polarizing inclusions composed of trilamellar sheets are valuable diagnostic markers.
Trilamellar inclusions are detectable by electron microscopy.
Macrophage features remain preserved in archival tissue samples.
Insoluble lipids, polarizing inclusions, and trilamellar structures should be examined in adrenal cortex.

Conclusions:

Microscopic findings, including specific macrophage characteristics and inclusions, are vital for diagnosing peroxisomal disorders.
Standard stains and commercially available reagents facilitate reproducible diagnostic evaluations.
Electron microscopy is essential for detecting subtle trilamellar inclusions.

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