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Neurosteroid modulation of allopregnanolone and GABA effect on the GABA-A receptor
Umeå universitet, Medicinska fakulteten, Institutionen för klinisk vetenskap, Obstetrik och gynekologi.
Umeå universitet, Medicinska fakulteten, Institutionen för klinisk vetenskap, Obstetrik och gynekologi.
Umeå universitet, Medicinska fakulteten, Institutionen för klinisk vetenskap, Obstetrik och gynekologi.
Umeå universitet, Medicinska fakulteten, Institutionen för klinisk vetenskap, Obstetrik och gynekologi.
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2006 (Engelska)Ingår i: Neuroscience, ISSN 0306-4522, E-ISSN 1873-7544, Vol. 143, nr 1, s. 73-81Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2006. Vol. 143, nr 1, s. 73-81
Nyckelord [en]
Analysis of Variance, Animals, Brain/cytology, Cells; Cultured, Chloride Channels/drug effects/physiology, Chlorides/metabolism, Dose-Response Relationship; Drug, Drug Interactions, Male, Membrane Potentials/drug effects/physiology/radiation effects, Neurons/*drug effects/physiology, Patch-Clamp Techniques/methods, Pregnanolone/*pharmacology, Rats, Rats; Wistar, Receptors; GABA-A/*metabolism, Steroids/*pharmacology, gamma-Aminobutyric Acid/*pharmacology
Nationell ämneskategori
Medicin och hälsovetenskap
Identifikatorer
URN: urn:nbn:se:umu:diva-10000DOI: 10.1016/j.neuroscience.2006.07.031PubMedID: 16938407OAI: oai:DiVA.org:umu-10000DiVA, id: diva2:149671
Tillgänglig från: 2008-06-04 Skapad: 2008-06-04 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
Ingår i avhandling
1. Sex and stress steroid modulation of GABA mediated chloride ion flux in rat CNS
Öppna denna publikation i ny flik eller fönster >>Sex and stress steroid modulation of GABA mediated chloride ion flux in rat CNS
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Background: Sex and stress steroids are metabolized to 3a-hydroxy-pregnane-steroid metabolites such as allopregnanolone (Allo) and tetrahydrodeoxycorticosterone (THDOC). Allo and THDOC are neuroactive steroids that are metabolized in the brain and act in brain as potent positive GABAA receptor function modulators. Allo as well as THDOC levels increase during stress. Allo has been associated with a number of symptoms and malfunctions such as impaired memory function and negative mood symptoms in a subgroup of individuals both for animals and humans. Pregnane steroids with 3b-hydroxy-configuration (3b-steroids) have been shown to reduce the Allo enhanced GABA effect.

Aims: The aims for the present thesis were to investigate the effect of 3b-steroids on the GABA mediated GABAA receptor function in presence of positive GABAA receptor modulators. Further, the regional variances between the 3b-steroids as well as the mechanism of the effect were studied. Finally, the effect of stress steroid metabolites on the GABAA receptor function was investigated.

Results: 3b-OH-5a-pregnane-20-one reduced the Allo enhanced GABA mediated chloride ion uptake into cortical microsacs. The 3b-isomer reduced the efficacy of Allo without shift the concentration response curve. It is therefore suggested that the 3b-isomer has a non-competitive effect. Further, it was shown that the 3b-isomer reduced the Allo effect in a selective way since the 3b-isomer did not interact with other positive modulators or with GABA itself. Five tested 3b-steroids reduced the Allo enhanced GABA mediated chloride ion uptake in cerebral cortex and hippocampus as well as the Allo prolongation on spontaneous inhibitory postsynaptic currents (sIPSCs) in preoptic nucleus. In cerebellum on the other hand the 3b-steroids showed to have weaker or no effect compared to the other tested regions. Interestingly, in absence of Allo, two of the 3b-steroids positively modulated the GABA stimulated GABAA receptor function. In absence of Allo, 5b-pregnane-3b,20(R)-diol increased the desensitization rate of current response. In contrast to the reducing effect on the Allo induced prolongation on sIPSCs, the effect of the 3b-steroid on GABA application, was not altered in presence of Allo. The mechanism of the 3b-steroid is therefore suggested being desensitization dependent in contrast to Allo, which has been suggested to decrease the GABA unbinding rate. In contrast to the enhanced effect of Allo, glucocorticoid metabolites reduced the GABA mediated chloride ion uptake in a concentration dependent way. The results in present thesis indicate that both sex and stress steroid metabolites interact with the GABAA receptor function. The knowledge that diversity of endogenous steroids interact with the GABAA receptor function is of importance for further understanding of different sex and stress steroid related symptoms and syndromes.

Ort, förlag, år, upplaga, sidor
Umeå: Klinisk vetenskap, 2007. s. 64
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 1091
Nyckelord
allopregnanolone, chloride ion uptake, patch-clamp, 3beta-steroids, kinetic parameters, rat brain
Nationell ämneskategori
Klinisk vetenskap
Identifikatorer
urn:nbn:se:umu:diva-1056 (URN)978-91-7264-269-0 (ISBN)
Disputation
2007-04-13, Hörsal Betula, 6M, bv, Norrlands Universitetssjukhus, Umeå, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2007-03-27 Skapad: 2007-03-27 Senast uppdaterad: 2011-04-07Bibliografiskt granskad

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Strömberg, JessicaHaage, DavidTaube, MagdalenaBäckström, TorbjörnLundgren, Per

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