Alterations of the perivascular dystrophindystroglycan complex following brain lesions. an immunohistochemical study in rats

M. Kálmán, J. Mahalek, A. Adorján, I. Adorján, K. Pócsai, Z. Bagyura, S. Sadeghian

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11 Citations (Scopus)

Abstract

Dystroglycan is a laminin receptor, which with dystrophins and other components forms the dystrophin-dystroglycan complex. It has an important role in the formation of gliovascular connections, cerebral vascularisation and blood-brain barrier. Dystroglycan consists of two sub-units, α and ß. Previous studies demonstrated that the ß-dystroglycan immunoreactivity of cerebral vessels temporarily disappeared in the area adjacent to the lesion, whereas the vascular laminin which is not immunoreactive in the intact brain became detectable. The present study extends these investigations over other components of the complex: utrophin, α1-syntrophin and α1-dystrobrevin. The experiments were performed on adult rats. The lesions were stab wounds or cryogenic lesions in deep ketamine-xylasine narcosis. Following survival periods 2 to 30 days, the animals were perfused and floating brain sections were processed for fluorescent immunohistochemistry. The α1-dystrobrevin, like ßdystroglycan, vanished temporarily around the lesion. The immunoreactivity of utrophin changed in a similar way to that of laminin. In intact brains they were confined to the entering segments of the vessels and to the circumventricular organs. Following lesions their immunoreactivity manifested in the vessels around the lesions. However, utrophin followed laminin with a delay: their peaks were about POD (postoperative days) 21 and 7, respectively. Only immunoreactivity of α1-syntrophin appeared in the reactive astrocytes, peaking at POD 14. Double-labeling proved its co-localization with GFAP. Cryogenic lesions had similar immunohistochemical effects, but provided more suitable samples for Western blot analysis, which proved the altered levels of α1-dystrobrevin and α1-syntrophin. The phenomena may help to monitor the post-lesion vascular processes and the alterations of the gliovascular connections.

Original languageEnglish
Pages (from-to)1435-1452
Number of pages18
JournalHistology and Histopathology
Volume26
Issue number11
Publication statusPublished - Nov 1 2011

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Keywords

  • Cerebrovascular basal lamina
  • Dystrobrevin
  • Laminin
  • Syntrophin
  • Utrophin

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

Cite this

Kálmán, M., Mahalek, J., Adorján, A., Adorján, I., Pócsai, K., Bagyura, Z., & Sadeghian, S. (2011). Alterations of the perivascular dystrophindystroglycan complex following brain lesions. an immunohistochemical study in rats. Histology and Histopathology, 26(11), 1435-1452.