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Extracutaneous ultrastructural alterations in pseudoxanthoma elasticum
Dealba Gheduzzi1, Rita Sammarco, Daniela Quaglino
1Department of Biomedical Sciences, University of Modena and Reggio Emilia, Modena, Italy.
Ultrastructural Pathology
|December 9, 2003
Summary
Pseudoxanthoma elasticum (PXE) affects all organs, causing widespread elastic fiber mineralization. This systemic connective tissue disorder likely involves fibroblasts and smooth muscle cells, aiding in diagnosis.
Area of Science:
- Connective Tissue Biology
- Genetic Disorders
- Cellular Ultrastructure
Background:
- Pseudoxanthoma elasticum (PXE) is a genetic disorder caused by ABCC6 gene mutations.
- PXE manifests with skin, eye, and cardiovascular issues, primarily due to elastic fiber mineralization.
- The exact physiological role of the MRP6 transporter remains unknown.
Observation:
- Autopsy tissues from PXE patients revealed widespread ultrastructural alterations.
- These changes included fragmented and mineralized elastic fibers, abnormal collagen, and extracellular matrix aggregates.
- Alterations were most severe in clinically affected organs, but present systemically.
Findings:
- PXE affects all examined organs, indicating a systemic connective tissue disorder.
- Both arteries and veins showed similar damage, particularly in adventitia and perivascular areas.
- Fibroblasts and smooth muscle cells are implicated as key cell types in PXE pathogenesis.
Implications:
- PXE is a systemic disease affecting all soft connective tissues, even without overt clinical signs.
- Understanding the cellular basis can improve diagnostic approaches for PXE.
- Further research into MRP6 function is crucial for understanding PXE pathology.