Turkish Neurosurgery 2013 , Vol 23 , Num 1
Human Brain Arteriovenous Malformations are Associated with Interruptions in Elastic Fibers and Changes in Collagen Content
Yi GUO1, Shi-Wei QUMU2, Osman Arikan NACAR3, Jin-Yan YANG4, Jiang DU5, Deniz BELEN3, Lin PAN6, Yuan-Li ZHAO1
1Capital Medical University, Beijing Tiantan Hospital, Department of Neurosurgery, Beijing, China
2Peking Union Medical College, Department of Neurosurgery, Beijing, China
3Ankara Numune Education and Research Hospital, Department of Neurosurgery, Ankara, Turkey
4Baoding No.1 Hospital, Department of Radiology and Imaging, Baoding, China
5Capital Medical University, Department of Neuropathology, Beijing, China
6China-Japan Friendship Hospital, Institute of Clinical Medicine, Beijing, China
DOI : 10.5137/1019-5149.JTN.5911-12.0 AIM: We hypothesized that the loss of structural integrity in vessels of brain arteriovenous malformations (bAVM) is associated with abnormal expression of collagen subtypes.

MATERIAL and 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).

CONCLUSION: 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. Keywords : Arteriovenous malformation, Collagen, Elastic fibers

Corresponding author : Yuan-li Zhao, zhaolang88@hotmail.com