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Sex-dependent differences in the activity and modulation of N-methyl-d-aspartic acid receptors in rat dorsal root ganglia neurons.

Abstract：

:Women have greater temporal summation of experimental pain stimuli and also have a higher propensity for developing chronic visceral pain conditions. Sex hormone-mediated regulation of N-methyl-d-aspartic acid receptors (NMDARs) in nociceptive pathways is a plausible mechanism that may underlie these phenomena. The aim of this study was to compare the effect of 17-beta-estradiol (E2) in modulation of NMDAR activity in adult male and female rat dorsal root ganglia (DRG) neurons. DRG neurons were collected from adult male or female rats and grown in short-term culture in steroid-free media. NMDAR currents were recorded on small to medium size neurons by whole cell patch clamp using rapid perfusion with saturating concentrations of N-methyl-d-aspartic acid and glycine in the absence of extracellular Mg(2+). We found that the average density of NMDAR currents was 2.8-fold larger in DRG neurons from female rats compared with male rats (P<0.0001). Addition of 100 nM E2 increased NMDAR currents 55+/-15% in female neurons, but only 19+/-7% in male neurons. Potentiation was maximal after 20-40 min and dose dependent with an apparent 50% excitatory concentration of 17-23 nM. This effect was mimicked by E2 conjugated to BSA and attenuated by pretreatment with the protein tyrosine kinase inhibitor lavendustin A (1 microM) or the estrogen receptor (ER) antagonist, ICI 182,780 (1 microM), strongly suggesting activation of a cell surface ER acting through a non-genomic mechanism involving protein tyrosine kinases to increase NMDAR currents. These results identify sex-based differences in both the basal expression and the regulation of the NMDARs in DRG neurons.

journal_name

Neuroscience

journal_title

Neuroscience

authors

McRoberts JA,Li J,Ennes HS,Mayer EA

doi

10.1016/j.neuroscience.2007.07.006

subject

Has Abstract

pub_date

2007-09-21 00:00:00

pages

1015-20

issue

4

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(07)00875-5

journal_volume

148

pub_type

杂志文章

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