The diagnosis of mucopolysaccharidoses by electron microscopy of skin biopsies
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Abstract:
An ultrastructural examination was carried out on the skin of six children suffering from Mucopolysaccharidosis I (MPSI or Hurler's disease) and MPS II (Hunter's disease). Both intracellular mucopolysaccharides and lipids were observed. The dermal cells, i.e. fibroblasts, macrophages, were loaded with multiple vacuolar inclusions thought to be of lysosomal origin. They appeared either content-free or filled with granular, fuzzy and/or pseudomyelinic structures. Identical abnormalities were observed within the Schwann cells, smooth muscle cells and keratinocytes. Mast cells showed peculiar "worm-like" inclusions apart from their normal granulations. Since ultrastructure of a skin sample may provide as much data as brain, liver or kidney, cutaneous electron microscopy can be recommended to confirm a diagnosis of MPS.
Insights
Ultrastructural examination of skin in children with Mucopolysaccharidosis I (Hurler's disease) and MPS II (Hunter's disease) revealed abnormal cellular inclusions. Cutaneous electron microscopy can aid in diagnosing these lysosomal storage disorders.
Area of Science:
- Cell Biology
- Genetics
- Pediatrics
Background:
- Mucopolysaccharidoses (MPS) are rare genetic disorders characterized by the accumulation of glycosaminoglycans.
- Lysosomal storage disorders like MPS I (Hurler's disease) and MPS II (Hunter's disease) affect multiple organ systems.
- Skin biopsy can offer insights into systemic metabolic abnormalities.
Purpose of the Study:
- To investigate the ultrastructural skin changes in children diagnosed with MPS I and MPS II.
- To evaluate the diagnostic utility of cutaneous electron microscopy in MPS.
Main Methods:
- Ultrastructural examination of skin biopsies from six children with MPS I or MPS II.
- Analysis of intracellular inclusions within dermal and epidermal cells, including fibroblasts, macrophages, Schwann cells, smooth muscle cells, keratinocytes, and mast cells.
Main Results:
- Observed intracellular accumulation of mucopolysaccharides and lipids within various skin cell types.
- Identified lysosome-derived vacuolar inclusions with diverse ultrastructural morphologies (content-free, granular, fuzzy, pseudomyelinic).
- Noted unique "worm-like" inclusions in mast cells, distinct from normal granulations.
Conclusions:
- Cutaneous electron microscopy reveals characteristic ultrastructural abnormalities in MPS I and MPS II.
- Skin biopsy findings are comparable in diagnostic value to those from brain, liver, or kidney.
- Ultrastructural analysis of skin is a valuable adjunctive method for confirming MPS diagnoses.
