Abstract
Tamoxifen is a selective estrogen receptor modulator. In this study we investigated whether or not tamoxifen reduces intracerebral hemorrhage (ICH)-induced brain injury in rats. In all experiments, adult male Sprague-Dawley rats received an injection of 100 μL autologous whole blood into the right basal ganglia. In the first set of experiments, rats were treated with tamoxifen (2.5 mg/kg or 5 mg/kg, i.p.) or vehicle 2 and 24 h after ICH and were killed at day 3 for brain edema measurement. In the second set of experiments, rats were treated with tamoxifen (5 mg/kg) or vehicle and magnetic resonance imaging (MRI), and behavior tests were performed at days 1, 7, 14 and 28. Rats were killed at day 28 for brain histology. We found that tamoxifen at 5 but not at 2.5 mg/kg reduced perihematomal brain edema at day 3 (p < 0.05). Brain histology showed that tamoxifen reduced caudate atrophy at day 28 (p < 0.01). Tamoxifen also improved functional outcome (p < 0.05). MRI demonstrated a tendency to smaller T2* lesions in tamoxifen-treated rats. However, two out of five rats treated with tamoxifen developed hydrocephalus. These results suggest that tamoxifen has neuroprotective effects in ICH, but the cause of hydrocephalus development following tamoxifen treatment needs to be examined further.
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Acknowledgment
This study was supported by grants NS-017760, NS-039866 and NS-057539 from the National Institutes of Health (NIH) and 0755717Z, 0840016N from the American Heart Association (AHA). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH and AHA. Dr. Xie was supported by NSFC-30901549 from the China National Natural Science Foundation.
Conflict of interest statement We declare that we have no conflict of interest.
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Xie, Q., Guan, J., Wu, G., Xi, G., Keep, R.F., Hua, Y. (2011). Tamoxifen Treatment for Intracerebral Hemorrhage. In: Zhang, J., Colohan, A. (eds) Intracerebral Hemorrhage Research. Acta Neurochirurgica Supplementum, vol 111. Springer, Vienna. https://doi.org/10.1007/978-3-7091-0693-8_45
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DOI: https://doi.org/10.1007/978-3-7091-0693-8_45
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