Abstract
Relative 17β-estradiol (E2) deprivation and excessive production of mitochondrial oxygen free radicals (OFRs) with a high amount of Ca2+ influx TRPA1, TRPM2, and TRPV1 activity is one of the main causes of neurodegenerative disease in postmenopausal women. In addition to the roles of tamoxifen (TMX) and raloxifene (RLX) in cancer and bone loss treatments, regulator roles in Ca2+ influx and mitochondrial oxidative stress in neurons have not been reported. The aim of this study was to evaluate whether TMX and RLX interactions with TRPA1, TRPM2, and TRPV1 in primary hippocampal (HPC) and dorsal root ganglion (DRG) neuron cultures of ovariectomized (OVX) rats. Forty female rats were divided into five groups: a control group, an OVX group, an OVX+E2 group, an OVX+TMX group, and an OVX+RLX group. The OVX+E2, OVX+TMX, and OVX+RLX groups received E2, TMX, and RLX, respectively, for 14 days after the ovariectomy. E2, ovariectomy-induced TRPA1, TRPM2, and TRPV1 current densities, as well as accumulation of cytosolic free Ca2+ in the neurons, were returned to the control levels by E2, TMX, and RLX treatments. In addition, E2, TMX, and RLX via modulation of TRPM2 and TRPV1 activity reduced ovariectomy-induced mitochondrial membrane depolarization, apoptosis, and cytosolic OFR production. TRPM2, TRPV1, PARP, and caspase-3 and caspase-9 expressions were also decreased in the neurons by the E2, TMX, and RLX treatments. In conclusion, we first reported the molecular effects of E2, TMX, and RLX on TRPA1, TRPM2, and TRPV1 channel activation in the OVX rats. In addition, we observed neuroprotective effects of E2, RLX, and TMX on oxidative and apoptotic injuries of the hippocampus and peripheral pain sensory neurons (DRGs) in the OVX rats.
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Abbreviations
- [Ca2+]i :
-
Cytosolic free calcium ion
- ACA:
-
N-(p-Amylcinnamoyl) anthranilic acid
- ADPR:
-
ADP-ribose
- CAP:
-
Capsaicin
- CHPx:
-
Cumene hydroperoxide
- CPZ:
-
Capsazepine
- DMSO:
-
Dimethyl sulfoxide
- DRG:
-
Dorsal root ganglion
- E2:
-
17β-Estradiol
- EGTA:
-
Ethylene glycol-bis[2-aminoethyl-ether]-N,N,N,N-tetraacetic acid
- HPC:
-
Hippocampal
- MPT:
-
Permeability transition
- OFR:
-
Oxygen free radials
- PARP:
-
Poly(ADP-ribose) polymerase
- RLX:
-
Raloxifene
- TMX:
-
Tamoxifen
- TRP:
-
Transient receptor potential
- TRPA1:
-
Transient receptor potential ankyrin 1
- TRPM2:
-
Transient receptor potential melastatin
- TRPV1:
-
Transient receptor potential vanilloid 1
- VGCC:
-
Voltage-gated calcium channels
- WC:
-
Whole cell
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Acknowledgments
The abstracts of the study were presented at the 6th World Congress of Oxidative Stress, Calcium Signaling and TRP Channels, held on 24 and 27 May 2016 in Isparta, Turkey (www.cmos.org.tr). The authors wish to thank the researcher technicians İshak Suat Övey and Muhammet Şahin (Neuroscience Research Center, SDU, Isparta, Turkey) for helping with the Western blot and plate reader analyses.
Authorship Contributions
MN formulated the hypothesis and was responsible for writing the report. Ovariectomy of rats was performed by MN. The analyses were performed by YY.
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Unit of Scientific Research Project (BAP) of Suleyman Demirel University.
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This study was partially supported by the Unit of Scientific Research Project (BAP) of Suleyman Demirel University in Isparta, Turkey (Project Number BAP: 4135-YL2-14). There is no financial disclosure for the current study.
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The authors declare that they have no conflict of interest.
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Yazğan, Y., Nazıroğlu, M. Ovariectomy-Induced Mitochondrial Oxidative Stress, Apoptosis, and Calcium Ion Influx Through TRPA1, TRPM2, and TRPV1 Are Prevented by 17β-Estradiol, Tamoxifen, and Raloxifene in the Hippocampus and Dorsal Root Ganglion of Rats. Mol Neurobiol 54, 7620–7638 (2017). https://doi.org/10.1007/s12035-016-0232-5
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DOI: https://doi.org/10.1007/s12035-016-0232-5