Progressive neuropathologic lesions in vitamin E-deficient rhesus monkeys

Area of Science:

• Neuroscience
• Nutritional Science

Background:

• Vitamin E is a crucial antioxidant protecting the nervous system.
• Vitamin E deficiency is linked to neurological disorders in humans and animals.

Purpose of the Study:

• To investigate the neuropathological effects of chronic vitamin E deficiency in rhesus monkeys.
• To compare the observed lesions with those in vitamin E-deficient rats and humans.

Main Methods:

• Rhesus monkeys were fed a vitamin E-deficient diet for 30-33 months.
• Neuropathologic examination focused on central and peripheral nervous system lesions.
• Morphologic and morphometric analyses were performed on affected axons and neurons.

Main Results:

• Vitamin E-deficient monkeys developed progressive central and peripheral nervous system lesions, absent in supplemented controls.
• The primary lesion was sensory axon loss, predominantly affecting distal segments and large myelinated fibers.
• Associated findings included lipopigment accumulation and a chronic necrotizing myopathy.

Conclusions:

• Chronic vitamin E deficiency induces a distinct sensory axonopathy in rhesus monkeys.
• This model shares similarities with vitamin E-deficient states in rats and humans.
• Findings underscore the critical role of vitamin E in maintaining nervous system integrity.