Expression of 5alpha-reductase and 3alpha-hydroxisteroid oxidoreductase in the hippocampus of patients with chronic temporal lobe epilepsy.

Abstract:

PURPOSE:The hippocampus is one of the principal target areas for neurosteroidal action, and the major neuroendocrine conversion of progesterone appears to be 5alpha-reduction and 3alpha-hydroxysteroid oxidoreduction, leading to the potent neurosteroid 3alpha,5alpha-tetrahydroxyprogesterone. To investigate whether the human hippocampus is equipped with the enzymes 5alpha-reductase and 3alpha-hydroxysteroid oxidoreductase (3alpha-HSOR), we studied the expression of 5alpha-reductase types 1 and 2 and 3alpha-HSOR types 1 and 2 in the resected hippocampi of patients with medically intractable chronic temporal lobe epilepsy. METHODS:We studied tissue specimens from the hippocampi of 13 women, 25 men, and four children. Quantification of different mRNAs was achieved by competitive reverse transcription-polymerase chain reaction (RT-PCR). RESULTS:5Alpha-reductase 1 mRNA and 3alpha-HSOR 2 mRNA were expressed in hippocampi of children and adults, whereas 5alpha-reductase 2 mRNA and 3alpha-HSOR 1 mRNA were not expressed. Neither 5alpha-reductase 1 mRNA nor 3alpha-HSOR 2 mRNA concentrations in hippocampal tissue showed any statistically significant differences between women and men or between children and adults. CONCLUSIONS:This study demonstrates for the first time mRNA expression of the type 1 isozyme of 5alpha-reductase and the type 2 isozyme of 3alpha-HSOR in the human hippocampus. The finding that both 5alpha-reductase and 3alpha-HSOR are present in the hippocampus leads us to assume the synthesis of neuroactive steroids in this human brain area.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Stoffel-Wagner B,Beyenburg S,Watzka M,Blümcke I,Bauer J,Schramm J,Bidlingmaier F,Elger CE

doi

10.1111/j.1528-1157.2000.tb00133.x

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

140-7

issue

2

eissn

0013-9580

issn

1528-1167

journal_volume

41

pub_type

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