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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Detrimental effects of 17β-oestradiol after permanent middle cerebral artery occlusion

Bingham, D. and Macrae, I.M. and Carswell, H.V.O. (2005) Detrimental effects of 17β-oestradiol after permanent middle cerebral artery occlusion. Journal of Cerebral Blood Flow and Metabolism, 25. pp. 414-420. ISSN 0271-678X

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Abstract

Oestrogen is a complex hormone whose role as a neuroprotectant in experimental stroke has been published in numerous studies. However, although some clinical studies report a reduction in stroke incidence by oestrogen replacement therapy in postmenopausal women, others have found increased mortality and morbidity after stroke. Diathermy occlusion of the proximal middle cerebral artery (MCAO), one of the most reproducible rodent stroke models, has consequently been employed to investigate physiologic and supraphysiologic doses of 17-oestradiol on ischaemic brain damage. Lister Hooded rats were ovariectomised (OVX) and a 21-day release pellet (placebo, 0.025 or 0.25 mg 17-oestradiol) implanted in the neck. At 2 weeks after OVX, animals underwent MCAO and were perfusion fixed 24 hours later. Neuronal perikaryal damage was assessed from haematoxylin and eosin-stained sections and in adjacent sections, axonal pathology was assessed with amyloid precursor protein and Neurofilament 200 (NF-200) immunohistochemistry. 17-Oestradiol induced a dose-dependent increase in neuronal perikaryal damage, 0.025 and 0.25 mg 17-oestradiol increased damage by 20% (P<0.05) and 27.5% (P<0.01) compared with placebo. 17-Oestradiol did not influence axonal pathology compared with placebo. Our results suggest that 17-oestradiol treatment can exacerbate brain damage in experimental stroke. Thus, further investigation into the role of oestrogen and the mechanisms which mediate its effects in stroke is required.