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Reply Effects of progesterone or neuroactive steroid?
Journal article   Peer reviewed

Reply Effects of progesterone or neuroactive steroid?

Sheryl S Smith, Qi Hua Gong, Fu-Chun Hsu, Ronald S Markowitz, J. M. H ffrench-Mullen, Xinshe Li and Susan S Smith
Nature (London), v 395(6703), pp 652-653
15 Oct 1998

Abstract

Smith et al. reply - Morrowet al.are incorrect to state that we did not provide direct evidence that 3α-OH-5α-pregnan-20-one (3α,5α-THP, or allopregnanolone) levels were reduced by indomethacin. We pointed out that our previous studies showed that indomethacin administration concomitant with progesterone reduced the level of 3α,5α-THP in the central nervous system from 8.2 6 1.3 ng per g to 2.3 0.35 ng per g without altering levels of 5α-DHP or progesterone. This treatment, which prevented the withdrawal of 3α,5α-THP that normally accompanies progesterone withdrawal, completely prevented the withdrawal effects of progesterone we observed, including acceleration in the decay of GABA-gated current and upregulation of the GABAA-receptor α4 subunit.

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