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Dose-related neuroprotective versus neurodamaging effects of estrogens in rat cerebral ischemia: a systematic analysis
Linköping University Hospital, Linköping, Sweden.ORCID iD: 0000-0002-6681-0546
Linköping University Hospital, Linköping, Sweden.
Linköping University Hospital, Linköping, Sweden.
2009 (English)In: Journal of Cerebral Blood Flow and Metabolism, ISSN 0271-678X, E-ISSN 1559-7016, Vol. 29, no 8, p. 1359-1372Article, review/survey (Refereed) Published
Abstract [en]

Numerous studies of the effects of estrogens for stroke prevention have yielded conflicting results in human and animal studies alike. We present a systematical analysis of study design and methodological differences between 66 studies where estrogens' impact on ischemic brain damage in rat models has been investigated, providing evidence that the differences in results may be explained by high estrogen doses produced by slow-release pellets. These pellets have been used in all studies showing increased neurologic damage because of estrogens. Our data indicate that the increased neurologic damage is related to the pellets' plasma concentration profile with an early, prolonged, supraphysiological peak. Neither the method of inducing the ischemic brain lesions, the choice of variables for measuring outcome, the measured plasma concentrations of estrogens at the time of ischemia nor rat population attributes (sex, strain, age, and diseases) are factors contributing to the discrepancies in results. This suggests that the effects of estrogens for stroke prevention are concentration related with a complex dose-response curve, and underscores the importance of carefully validating the experimental methods used. Future studies of hormone-replacement therapy in women may have to take dosage and administration regimens into account.

Place, publisher, year, edition, pages
New York, USA: Nature Publishing Group, 2009. Vol. 29, no 8, p. 1359-1372
Keywords [en]
Ischemia, estrogen, hormone administration, methodology, rat
National Category
Medical and Health Sciences Neurology
Identifiers
URN: urn:nbn:se:oru:diva-48112DOI: 10.1038/jcbfm.2009.66ISI: 000268515500001PubMedID: 19458604Scopus ID: 2-s2.0-6824908629OAI: oai:DiVA.org:oru-48112DiVA, id: diva2:901438
Available from: 2016-02-08 Created: 2016-02-08 Last updated: 2017-11-30Bibliographically approved

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Ström, Jakob O.

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