Hepatocyte giant mitochondria: an almost constant lesion in systemic scleroderma

Area of Science:

• Hepatology
• Cell Biology
• Rheumatology

Background:

• Systemic scleroderma is an autoimmune disease affecting connective tissues.
• Liver involvement can occur in systemic scleroderma, but its cellular manifestations are not fully understood.

Purpose of the Study:

• To investigate the ultrastructural changes in hepatocytes of patients with systemic scleroderma.
• To identify specific cellular abnormalities associated with systemic scleroderma in the liver.

Main Methods:

• Liver tissue samples were obtained from 14 patients diagnosed with systemic scleroderma.
• Electron microscopy was utilized to examine the ultrastructure of hepatocytes.

Main Results:

• Giant mitochondria were observed in hepatocytes of 13 out of 14 patients (93%).
• This ultrastructural abnormality was consistently found across different types and durations of systemic scleroderma.
• Giant mitochondria were present even in cases where liver histology appeared normal.

Conclusions:

• Giant mitochondria represent a common ultrastructural finding in the liver of patients with systemic scleroderma.
• The presence of giant mitochondria is independent of disease characteristics and histological normality.
• The underlying mechanism driving giant mitochondria formation in systemic scleroderma requires further investigation.