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Clin Sci (Lond). 2017 Nov 13;131(22):2737-2744. doi: 10.1042/CS20171278. Print 2017 Nov 15.

The structure of the perivascular compartment in the old canine brain: a case study.

Author information

1
Faculty Of Medicine, Institute for Life Sciences, University of Southampton, Southampton General Hospital, South Academic Block, MP806, Tremona Road, Southampton, Hampshire SO16 6YD.
2
inVICRO, Boston, U.S.A.
3
Department of Clinical Studies, University of Guelph.
4
Department of Biomedical Physics, Western University.
5
Biogen, U.S.A.
6
Faculty Of Medicine, Institute for Life Sciences, University of Southampton, Southampton General Hospital, South Academic Block, MP806, Tremona Road, Southampton, Hampshire SO16 6YD rcn@soton.ac.uk.

Abstract

Dilatation of periarteriolar spaces in MRI of the ageing human brains occurs in white matter (WM), basal ganglia and midbrain but not in cerebral cortex. Perivenous collagenous occurs in periventricular but not in subcortical WM.Here we test the hypotheses that (a) the capacity for dilatation of periarteriolar spaces correlates with the anatomical distribution of leptomeningeal cells coating intracerebral arteries and (b) the regional development of perivenous collagenous in the WM correlates with the population of intramural cells in the walls of veins.The anatomical distribution of leptomeningeal and intramural cells related to cerebral blood vessels is best documented by electron microscopy, requiring perfusion-fixed tissue not available in human material. We therefore analysed perfusion-fixed brain from a 12-year-old Beagle dog as the canine brain represents the anatomical arrangement in the human brain. Results showed regional variation in the arrangement of leptomeningeal cells around blood vessels. Arterioles are enveloped by one complete layer of leptomeninges often with a second incomplete layer in the WM. Venules showed incomplete layers of leptomeningeal cells. Intramural cell expression was higher in the post-capillary venules of the subcortical WM when compared with periventricular WM, suggesting that periventricular collagenosis around venules may be due to a lower resistance in the venular walls. It appears that the regional variation in the capacity for dilatation of arteriolar perivascular spaces in the white WM may be related to the number of perivascular leptomeningeal cells surrounding vessels in different areas of the brain.

KEYWORDS:

leptomeninges; periarterial; perivascular spaces; perivenous

PMID:
28982724
DOI:
10.1042/CS20171278
[Indexed for MEDLINE]

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