Human brain arteriovenous malformations are associated with interruptions in elastic fibers and changes in collagen content.
OBJECTIVE
We hypothesized that the loss of structural integrity in vessels of brain arteriovenous malformations (bAVM) is associated with abnormal expression of collagen subtypes.


METHODS
We retrospectively obtained the nidus tissue specimens from 24 bAVM patients and structurally normal cerebral cortex from six surgical epilepsy patients. The samples were paraffin-embedded and stained with Victoria blue and picrosirius red and examined by light microscopy.


RESULTS
Light microscopy showed that collagen fibers became disorganized, and the internal elastic lamina was duplicated or interrupted in the arteries from the nidus tissue of bAVM. In some vessels in the nidus, Col I was the only collagen component and the interstitial tissue was mainly comprised of Col I. bAVM patients showed significantly higher Col I levels (86.25% ±13.92) and lower Col III levels (13.75% ±13.92) in the vasculature in the nidus tissue than those of otherwise normal surgical epilepsy patients (Col I, 80.78% ±18.03; Col III, 19.22% ±18.03) (p < 0.001). Additionally, bAVM patients showed a higher Col I / Col III ratio (24.71±40.47) than that of normal controls (16.04 ±31.28) (p < 0.001).


CONCLUSIONS
bAVM patients exhibit changes in the Col I/Col III ratio and elastic fibers in the vasculature, which may compromise the structural integrity of cerebral vessels.
Capital Medical University, Beijing Tiantan Hospital, Department of Neurosurgery, Beijing, China.
Yi
Y
Guo
Shi-Wei
SW
Qumu
Osman Arikan
OA
Nacar
Jin-Yan
JY
Yang
Jiang
J
Du
Deniz
D
Belen
Lin
L
Pan
Yuan-Li
YL
Zhao
D000328:Adult; D002536:Cerebral Arteries / Q000378:metabolism*; D024042:Collagen Type I / Q000378:metabolism*; D024061:Collagen Type III / Q000378:metabolism*; D004547:Elastic Tissue / Q000378:metabolism*; D004827:Epilepsy / Q000378:metabolism / Q000473:pathology; D005260:Female; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000378:metabolism / Q000473:pathology*; D008297:Male; D012189:Retrospective Studies; D013194:Staining and Labeling / Q000379:methods; D055815:Young Adult
D024042:Collagen Type I; D024061:Collagen Type III