Administering ascorbic acid to rats undergoing ageing processes: effects on myosin-V immunoreactive myenteric neurons

Area of Science:

• Gastroenterology
• Neuroscience
• Aging Research

Background:

• The aging process impacts the enteric nervous system, leading to neurodegeneration.
• Oxidative stress contributes to neuronal death, and antioxidants like ascorbic acid (AA) may offer protection.

Purpose of the Study:

• To investigate the morph quantitative changes in myenteric neurons of the rat duodenum during aging.
• To evaluate the potential neuroprotective effects of ascorbic acid supplementation on these age-related neuronal changes.

Main Methods:

• Wistar rats of different ages (90, 345, 428 days) were studied, with some receiving 120-day ascorbic acid supplementation.
• Duodenal muscle layers were prepared as whole-mounts and immunostained for myosin V.
• Neuronal density and cell body area were quantified across 80 microscopic fields per animal.

Main Results:

• A reduction in neuronal density was observed in all age groups, unaffected by ascorbic acid supplementation.
• Neuronal cell body area increased in the oldest group (428 days), demonstrating an age-related influence.
• Ascorbic acid (1 mL/g body weight) did not exhibit a neuroprotective effect on the myosin V-immunoreactive myenteric neuron population.

Conclusions:

• Aging significantly reduces myenteric neuron density in the rat duodenum.
• Ascorbic acid supplementation did not mitigate age-induced neuronal loss or alter neuronal morphology in this study.
• The findings suggest ascorbic acid may not be neuroprotective for the myenteric nervous system in aged rats under these conditions.