Abstract:
:We used whole-cell recording to identify, for the first time, GABAergic tonic current in subpopulations of substantia gelatinosa neurons in mouse spinal cord slices. Application of the gamma-aminobutyric acid type A receptor antagonist bicuculline revealed tonic currents in 49 of 73 substantia gelatinosa neurons. These tonic currents were dissected into three groups according to their diverse pharmacological properties. In the first group, furosemide failed to block the tonic current while midazolam and propofol potentiated it. In the second group, furosemide blocked the tonic current but midazolam and propofol failed to enhance the current. In the third group, furosemide blocked and 3alpha, 21-dihydroxy-5alpha-pregnan-20-one enhanced the tonic current. The presence of mRNAs for alpha4, alpha5, delta and epsilon subunits in the substantia gelatinosa (reverse-transcriptase polymerase chain reaction) suggest that gamma-aminobutyric acid type A receptors comprising alpha5betaxgamma2, alphaxbetaxepsilon and alpha4betaxdelta subunits are responsible for tonic currents.
journal_name
Neuroreportjournal_title
Neuroreportauthors
Takahashi A,Mashimo T,Uchida Idoi
10.1097/01.wnr.0000230515.86090.bcsubject
Has Abstractpub_date
2006-08-21 00:00:00pages
1331-5issue
12eissn
0959-4965issn
1473-558Xpii
00001756-200608210-00021journal_volume
17pub_type
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