Expression of Angiopoietin-1 and the receptor Tie-2 mRNA in rat brains following intracerebral hemorrhage.
Angiopoietin-1 (Ang-1) belongs to a novel family of endothelial growth factors that function as ligands for an endothelialspecific receptor tyrosine kinase (Tie-2). The Ang-/Tie-2 system may contribute to angiogenesis and vascular remodeling by mediating interactions of endothelial cells with smooth muscle cells and pericytes. The spatial distribution and temporal expression of Ang-1 and Tie-2 in the rat brain were studied following collagenase-induced intracerebral hemorrhage (ICH) by immunohistochemistry and reverse transcription-polymerase chain (RT-PCR) analysis, respectively. Immunohistochemical analysis revealed that some Ang-1 or Tie-2-positive dilated vessels resided around the hematoma and extended into the clot. RT-PCR analysis showed that Ang-1 and Tie-2 mRNA signal was detected at 2 days and persisted for 28 days after ICH. These findings suggest that ICH could lead to upregulation of Ang-1 and the receptor Tie-2 mRNA.
Institute of Integrative Medicine, Xiangya Hospital, Central South University. Changsha, Hunan, People's Republic of China.
HuaJun
H
Zhou
Tao
T
Tang
Canjie
C
Guo
Hainan
H
Zhang
JianHua
J
Zhong
Jie
J
Zheng
JieKun
J
Luo
Yuan
Y
Lin
Wei
W
Liu
WenFang
W
Luo
QiDong
Q
Yang
D000704:Analysis of Variance; D042683:Angiopoietin-1 / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000378:metabolism*; D002543:Cerebral Hemorrhage / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D004195:Disease Models, Animal; D005786:Gene Expression Regulation / Q000502:physiology*; D008297:Male; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D042787:Receptor, TIE-2 / Q000235:genetics / Q000378:metabolism*; D013997:Time Factors
D042683:Angiopoietin-1; D012333:RNA, Messenger; D042787:Receptor, TIE-2