Temporal profile of neural stem cell proliferation in the subventricular zone after ischemia/hypoxia in the neonatal rat brain.

Abstract:

OBJECTIVES:Ischemia/hypoxia (I/H) causes severe neonatal brain injury, such as periventricular leukomaracia and hypoxic/ischemic encephalopathy. Neural stem cell research could lead to a treatment for such disorders. In order to elucidate the dynamic changes in neural stem cells in the neonatal brain after I/H, we investigated the proliferation of new cells in the subventricular zone (SVZ). METHODS:Seven-day-old Wister rats were subjected to ligation of the left carotid artery followed by 2 hours of hypoxic stress (8% O(2) and 92% N(2), at 33 degrees C). In order to elucidate the dynamic change of neural stem cells in the SVZ, single bromodeoxyuridine (BrdU; 50 mg/kg) was administered 2 hours before death 1, 7, 14 and 21 days after I/H. Immunohistochemical and immunofluorescent studies for BrdU and doublecortin (DCX) were carried out. As a control, a group of rats was subjected to sham surgery (incision of skin, but no ligation of the carotid artery) and no I/H. RESULTS:The numbers of BrdU-labeled cells in the SVZ, for both the ipsilateral side and the contralateral side of the I/H brain, were twice the level of the control at 7 days after I/H, but the numbers for both sides returned to the control level at 21 days. In the ipsilateral side of the I/H brain, the number of BrdU-labeled cells in the SVZb (lining the upper wall of lateral ventricle) was 4-fold at 7 days and 15-fold at 21 days after I/H compared with the control level. This chronological pattern is very similar to the pattern for I/H results of the posterior periventricle (pPV). DCX appeared in most BrdU-labeled cells in the SVZb and pPV. DISCUSSION:These findings indicate that I/H enhances neural stem cell proliferation in the SVZ, and some newborn cells migrate as neural precursors to the SVZb and pPV after I/H in the neonatal rat brain.

journal_name

Neurol Res

journal_title

Neurological research

authors

Iwai M,Ikeda T,Hayashi T,Sato K,Nagata T,Nagano I,Shoji M,Ikenoue T,Abe K

doi

10.1179/016164105X49283

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

461-8

issue

4

eissn

0161-6412

issn

1743-1328

journal_volume

28

pub_type

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