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CYTOCHROME OXIDASE IN NORMAL AND REGENERATING NEURONS.

H A Howe¹, R C Mellors

¹Poliomyelitis Research Center, Department of Epidemiology, Johns Hopkins University, Baltimore.

The Journal of Experimental Medicine

|October 30, 2009

Summary

This summary is machine-generated.

Neurons contribute significantly to thalamic cytochrome oxidase activity, while glial and mesodermal cells maintain baseline levels. Nerve section reduces anterior horn cytochrome oxidase, coinciding with virus resistance.

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Published on: May 23, 2011

Area of Science:

Neuroscience
Biochemistry

Background:

Cytochrome oxidase activity is crucial for cellular respiration.
Understanding the cellular contribution to enzyme activity is vital for neurological research.

Purpose of the Study:

To quantify cytochrome oxidase activity in cat and monkey thalamus and anterior horn.
To investigate the impact of neuronal degeneration and nerve section on enzyme activity.

Main Methods:

Manometric determination of cytochrome oxidase activity.
Experimental decortication in cats to induce thalamic neuron degeneration.
Peripheral nerve section in cats and monkeys to stimulate motoneuron regenerative activity.

Main Results:

Neurons account for approximately 34% of thalamic cytochrome oxidase activity.
Decortication led to a 34% reduction in thalamic enzyme activity.
Nerve section caused a 22-23% reduction in anterior horn cytochrome oxidase activity in both species.
Maximal enzyme reduction correlated with maximal virus refractoriness, not chromatolysis.

Conclusions:

Neuronal integrity is essential for normal cytochrome oxidase levels in the thalamus.
Changes in motoneuron functional state significantly impact anterior horn enzyme activity.
Cytochrome oxidase activity reduction is linked to cellular defense mechanisms against viral infection.