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Mitochondrial abnormalities in Menkes' kinky hair disease (MKHD). Electron-microscopic study of the brain from an
Abstract:
The brain of an autopsy case of Menkes' kinky hair disease (MKHD), after routine histological examination, was studied extensively by electron microscopy, particularly the mitochondrial alteration. There were widespread mitochondrial abnormalities, including enlargement with tubulo-vesiculated cristae, swelling, and dense body formation and occasional accumulation of glycogen within mitochondria, in addition to increased numbers of mitochondria in some neurons. These abnormalities of mitochondria were present in decreasing severity in the following: Purkinje cells, neurons of the molecular and granule cell layers of the cerebellum, and neurons of the cerebral cortex, globus pallidus, lateral nuclei of the thalamus, caudate nucleus, and the myelinated axons in the white matter. This distribution and the degree of mitochondrial abnormalities in the various structures of the brain were compared with those of degenerative lesions in the respective structures. The comparison disclosed that there was a positive correlation between the two. The mitochondrial enlargement and swelling as in the present study had been well documented in the brain of the brindled mouse; mitochondrial dense bodies had also been reported in previous case reports of MKHD by other authors. The present study strongly suggests that the mitochondrial disease is an essential abnormality and may be responsible for the progressive degeneration of the CNS in MKHD.
Insights
Menkes' kinky hair disease (MKHD) involves widespread mitochondrial abnormalities in the brain, particularly affecting neurons. These changes correlate with neurodegeneration, suggesting a primary role for mitochondrial dysfunction in MKHD.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Neuropathology
Background:
- Menkes' kinky hair disease (MKHD) is a rare genetic disorder affecting copper metabolism.
- Its neurological manifestations are severe and progressive, but the underlying cellular pathology is not fully understood.
Observation:
- Electron microscopy revealed widespread mitochondrial abnormalities in the brain of an MKHD autopsy case.
- Abnormalities included enlarged mitochondria with abnormal cristae, swelling, dense body formation, and glycogen accumulation.
- Mitochondrial alterations were most severe in Purkinje cells and cerebellar neurons, decreasing in the cerebral cortex and white matter.
Findings:
- A positive correlation was observed between the severity of mitochondrial abnormalities and degenerative lesions in different brain structures.
- These findings align with previous studies on MKHD and the brindled mouse model.
Implications:
- Mitochondrial dysfunction appears to be a critical factor in the central nervous system degeneration seen in MKHD.
- This suggests that targeting mitochondrial health could be a potential therapeutic strategy for MKHD.