Journal article
Marked Sexual Dimorphism in the Role of the Ryanodine Receptor in a Model of Pain Chronification in the Rat
Scientific reports, Vol.6(1), p.31221
08/08/2016
DOI: 10.1038/srep31221
PMID: 27499186
Abstract
Hyperalgesic priming, an estrogen dependent model of the transition to chronic pain, produced by agonists at receptors that activate protein kinase C epsilon (PKCε), occurs in male but not in female rats. However, activation of second messengers downstream of PKCε, such as the ryanodine receptor, induces priming in both sexes. Since estrogen regulates intracellular calcium, we investigated the interaction between estrogen and ryanodine in the susceptibility to develop priming in females. The lowest dose of ryanodine able to induce priming in females (1 pg) is 1/100,000th that needed in males (100 ng), an effect dependent on the activation of ryanodine receptors. Treatment of female rats with antisense to estrogen receptor alpha (ERα), but not beta (ERβ), mRNA, prevented the induction of priming by low dose ryanodine and the ERα agonist, PPT, induced ryanodine receptor-dependent priming. In vitro application of ryanodine in low concentration (2 nM) to small DRG neurons cultured from females, significantly potentiated calcium release via ryanodine receptors induced by caffeine. This effect was only observed in IB4+ neurons, cultured in the presence of β-estradiol or PPT. Our results demonstrate a profound regulatory role of ERα in ryanodine receptor-dependent transition to chronic pain.
Details
- Title: Subtitle
- Marked Sexual Dimorphism in the Role of the Ryanodine Receptor in a Model of Pain Chronification in the Rat
- Creators
- Luiz F. Ferrari - University of California, San FranciscoEugen V. Khomula - University of California, San FranciscoDioneiá Araldi - University of California, San FranciscoJon D. Levine - University of California, San Francisco
- Resource Type
- Journal article
- Publication Details
- Scientific reports, Vol.6(1), p.31221
- DOI
- 10.1038/srep31221
- PMID
- 27499186
- NLM abbreviation
- Sci Rep
- ISSN
- 2045-2322
- eISSN
- 2045-2322
- Grant note
- National Institutes of Health (http://data.elsevier.com/vocabulary/SciValFunders/100000002) National Institutes of Health R01NS084545 / National Institute of Neurological Disorders and Stroke (http://data.elsevier.com/vocabulary/SciValFunders/100000065) NS084545 / National Institutes of Health
- Language
- English
- Date published
- 08/08/2016
- Academic Unit
- Neuroscience and Pharmacology
- Record Identifier
- 9985177948702771
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