J Korean Neurol Assoc.
2006 Apr;24(2):141-147.
Prolaction May not Stimulate Generation of New Cells after Transient Focal Cerebral Ischemia in Adult Male Rat Brain: a Preliminary Study
- Affiliations
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- 1Department of Neurology, Clinical Research Institute, Seoul National University Hospital, Seoul, Korea. bwyoon@snu.ac.kr
- 2Department of Neurology, Asan Mental Hospital, Asan, Korea.
- 3Department of Neurology, Eulgi General Hospital, Seoul, Korea.
- 4Program in Neuroscience, Neuroscience Research Institute of SNUMRC, Seoul National University, Seoul, Korea.
- 5Center for Alcohol and Drug Addiction Research, Seoul National Hospital, Seoul, Korea.
Abstract
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BACKGROUND: Production of neuronal progenitors is usually stimulated in the forebrain subventricular zone of mice after the intracerebroventricular infusion of prolactin. As a preliminary study, we infused prolactin to the male rat brain to test the hypothesis that prolactin promotes new cell proliferation in the brain and functional recovery after focal ischemia.
METHODS
Male rats were subjected to intraluminal middle cerebral artery occlusion. Prolactin was administered to the surface of the brain for 5 or 14 days starting 24 or 48 hours after stroke onset at doses of 6.4 microgram per day. We administered the same volume of saline to the other ischemic rats used as a control group. Some rats were killed 6 or 17 days after stroke for analysis of infarct volume and newly generated cells within the subventricular zone and the striatum. The other rats were tested for neurological recovery 24 days after stroke.
RESULTS
There was no significant difference of infarct volume among the experiment groups. Treatment with prolactin did not increase the numbers of bromodeoxyuridine-immunoreactive cells in the subventricular zone and the striatum. Treatment with prolactin did not enhance neurological recovery in all tests performed.
CONCLUSIONS
In this preliminary study, prolactin did not enhance new cell generation in the male rat brain nor reduce the neurological deficits after ischemic stroke.
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