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ÀÌ»ó±¹/Sang Kook Lee ¹Ú½Â¿ø/±è¿µ¹é/¹Îº´±¹/Ȳ¼º³²/ÃÖ´ö¿µ/¼®Á¾½Ä/¹Ú¾ð¼·/Seung Won Park/Young Baeg Kim/Byung Kook Min/Sung Nam Hwang/Duck Young Choi/Jong Sik Suk/Eun Sup Park

Abstract

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ÀÔÀº µ¿¹°ÀÇ ¿îµ¿ ±â´É ȸº¹¿¡ ÀϺΠ°ü¿©ÇÒ °¡´É¼ºÀÌ ÀÖ´Â °ÍÀ¸·Î º¸ÀδÙ.
#ÃÊ·Ï#
Injury to specific areas of the immature brain, in both the human and animals, can
result in compensatory reorganization in undamaged adjacent or contralateral areas. The
functional plasticity of such compensatory hypertrophy is not well known, but in some
cases may be responsible for recovery of function. In order to investigate the effect of
unilateral ischemic injury on the contralateral cerebral hemisphere in neonatal rats, early
and late changes in various areas of both cerebral hemispheres were assessed.
Seventy-seven seven-day-old Sprague-Dawley rats underwent unilateral carotid artery
ligation and were then exposed to hypoxia(8% oxygen) for 3 hours. The animals were
killed one week(Group 1, 58 rats) and three months(Group ¥±, 19rats) later. Twelves
rats, comprising Group ¥², were exposed to hypoxia for 3 hours without carotid artery
ligation. The control group, consisting of 19 rats, did not undergo any of the above
procedure. In each slice of brain tissue(4§® posterior to the bregma), the area of the
whole brain, each hemisphere, and the frontoparietal, temporal and hippocampal regions
in each hemisphere were measured, using, each hemisphere, and the frontoparietal,
temporal and hippocampal regions in affected, proportions of each hemisphere occupied
by each region were compared.
In Group ¥±, the proportional areas of the frontoparietal(p<0.05) and temporal(p<0.01)
regions in the contralateral hemisphere increased significantly, compared with the control
group, but the hippocampal region showed no significant change. In Group ¥°, there was
no contralateral hypertrophy. The ipsilateral hemisphere showed significant atrophy and
there was weight reduction in Group ¥°(P<0.001) and ¥±(p<0.001).
The study suggests that unilateral hypoxia-ischemia results in ipsilateral hemispheric
atrophy and contralateral hypertrophy, especially in the frontoparietal and temporal areas,
may contribute to some functional recovery and compensation in addition to uncrossed
corticospinal or other descending motor systems.

Å°¿öµå

Immature brain; Hypoxia-ischemia; Hypertrophy; Functional recovery; Compensation.;

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