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Primary systemic amyloidosis. A case permitting pathological and biochemical investigations
Abstract:
In this 72-year-old male patient, large amounts of amyloid substances were deposited in the mesenchymal organs, but not in the parenchymal organs. Histochemical and electron microscopic studies revealed large amounts of amyloid substances and amyloid fibrils in the skeletal and smooth muscle tissues. In the skeletal muscle tissues, where large amounts of amyloid substances were deposited, glycosaminoglycan was also markedly deposited, especially chondroitin-4-sulfuric acid. The concentrations of silicon were also markedly increased in the amyloid fibrils. The concentrations of nickel and cobalt were increased but those of zinc were decreased in all organs measured, although both nickel and cobalt in another case of amyloidosis experienced were within normal values.
Insights
Amyloid deposition primarily affected mesenchymal organs, particularly skeletal and smooth muscles, in this patient. Increased silicon, nickel, and cobalt concentrations were found in amyloid fibrils and tissues.
Area of Science:
- Biochemistry
- Pathology
- Mineral Metabolism
Background:
- Amyloidosis is characterized by extracellular deposition of insoluble protein fibrils.
- Understanding the composition of amyloid deposits is crucial for diagnosing and treating amyloidosis.
Observation:
- A 72-year-old male patient presented with significant amyloid substance deposition in mesenchymal organs, sparing parenchymal organs.
- Histochemical and electron microscopy confirmed abundant amyloid fibrils in skeletal and smooth muscle tissues.
Findings:
- Marked deposition of glycosaminoglycans, specifically chondroitin-4-sulfuric acid, was observed in skeletal muscle amyloid.
- Elevated silicon concentrations were detected within amyloid fibrils.
- Increased nickel and cobalt, with decreased zinc, were noted in measured organs, contrasting with normal levels in a previous amyloidosis case.
Implications:
- These findings suggest a potential role for specific glycosaminoglycans and trace elements in amyloid fibril formation and deposition.
- The unique elemental profile warrants further investigation into environmental or metabolic factors contributing to this form of amyloidosis.
- This case highlights the heterogeneity of amyloidosis composition and potential diagnostic markers.