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Acetylcholinesterase decrease in the optic lobe after unilateral eye deprivation.

A Contestabile, M Ercolessi, A Bellucci

|June 15, 1978

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Unilateral eye removal in fish and turtles causes a decrease in acetylcholinesterase (AChE) activity in the opposite optic lobe. This neurochemical change reflects retinal fiber degeneration.

Area of Science:

Neuroscience
Comparative Anatomy
Histochemistry

Background:

Acetylcholinesterase (AChE) is a crucial enzyme in neural function.
The visual system's neuroplasticity is evident in responses to injury.

Purpose of the Study:

To investigate the impact of unilateral eye enucleation on AChE activity in the contralateral optic lobe of a teleost and a turtle.
To analyze histochemical changes in the optic lobe following retinal fiber degeneration.

Main Methods:

Unilateral eye enucleation was performed on a teleost and a turtle.
Acetylcholinesterase (AChE) activity was assessed in the contralateral optic lobe.
Histochemical analysis was conducted to observe changes in enzyme localization and pattern.

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Main Results:

A progressive decrease in AChE activity was observed in the optic lobe contralateral to the extirpated eye.
The AChE decrease reached approximately 15% in the teleost and over 20% in the turtle.
Histochemical patterns showed rearrangement due to retinal fiber degeneration, without drastic localization differences.

Conclusions:

Unilateral eye enucleation induces significant, quantifiable changes in contralateral optic lobe AChE activity in both teleosts and turtles.
The observed histochemical rearrangements highlight the neuroadaptive responses to retinal fiber degeneration.