[Changes in the reactivity of microvessels of the pia mater system of rats during ontogenesis]
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Microvascular reactivity in rat brains changes with age. Younger rats show less dilation, while adult rats exhibit stable compensatory adaptation in cerebral blood vessels after carotid artery occlusion.
Area of Science:
- Neuroscience
- Physiology
- Vascular Biology
Background:
- The pia mater microvasculature plays a crucial role in regulating cerebral blood flow.
- Understanding age-related changes in vascular response is vital for neurological health.
- Common carotid artery occlusion is a model to study cerebrovascular adaptation.
Purpose of the Study:
- To investigate age-dependent changes in microvascular reactivity of the rat pia mater.
- To determine the effects of bilateral common carotid artery occlusion on cerebral arterioles.
- To characterize the compensatory adaptation of microvessels across different postnatal developmental stages.
Main Methods:
- Studies were conducted on rats at postnatal days 7, 30, 45, and 90.
- Bilateral common carotid arteries were occluded for 6 minutes (7-day-old) or 9 minutes (older rats).
- Microvascular reactivity, specifically arteriole dilation, was measured and analyzed.
Main Results:
- Arteriole dilation in the pia mater system varied significantly with age.
- Dilation of precortical arterioles was 20-25% in 7-day-old rats, increasing to 60-75% in 30- and 45-day-old rats.
- Smaller diameter vessels demonstrated more pronounced reactivity, and only adult rats showed stable compensatory adaptation.
Conclusions:
- Age is a critical factor influencing microvascular reactivity in the rat brain's pia mater.
- Cerebral microvessels exhibit distinct adaptive responses to ischemic conditions based on developmental stage.
- Adult rats possess a mature, stable compensatory mechanism in their microvasculature, unlike younger animals.
Abstract:
Changes in microvascular reactivity in pia mater system have been studied under conditions of bilateral occlusion of common carotid arteries in rats of different age groups. The studies were performed on the 7th, 30th, 45th and 90th day of the postnatal development. The occlusion of common carotid arteries lasted 6 min in week-old animals and 9 min in rats of other age groups. The phase character of microvascular reactivity has been determined. It has been found that dilation of arterioles depends on the age of the animal. So dilation of precortical arterioles averaged 20-25% of the initial level in 7-day-old animals and increased to 60-75% in 30- and 45-day-old animals. It has been determined that the smaller is the diameter of the vessels the more expressed is their reactivity. It has been shown that a steady reaction of compensatory adaptation in microvessels in characteristic only of adult animals.