Send to

Choose Destination
See comment in PubMed Commons below
Neuromuscul Disord. 2008 Nov;18(11):869-72. doi: 10.1016/j.nmd.2008.07.004. Epub 2008 Sep 23.

Non-genomic effects of sex hormones on CLC-1 may contribute to gender differences in myotonia congenita.

Author information

  • 1MRC Centre for Neuromuscular Disease, UCL Institute of Neurology and National Hospital for Neurology, Queen Square, London WC1N 3BG, UK.


Myotonia congenita is caused by mutations in the voltage-gated chloride channel ClC-1. It is more severe in men than women and often worsens during pregnancy, but the basis for these gender differences is not known. We show here that both testosterone and progesterone rapidly and reversibly inhibit wild-type ClC-1 channels expressed in Xenopus oocytes by causing a prominent rightward shift in the voltage dependence of their open probability. In contrast, 17beta-estradiol at similar concentrations causes only a small shift. Progesterone and testosterone also profoundly inhibit ClC-1 channels containing the mutation F297S associated with dominantly inherited myotonia congenita. The effects of sex hormones are likely to be non-genomic because of their speed of onset and reversibility. These results suggest a possible mechanism to explain how the severity of myotonia congenita can be modulated by sex hormones.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center