Abstract
Summary
Calcitonin may relieve pain by modulating central serotonin activity. Calcitonin partly reversed the hypersensitivity to pain induced by ovariectomy. This suggests that the anti-nociceptive effects of calcitonin in the treatment of osteoporosis may be mediated by alterations in neural serotonin transporter (SERT) activity.
Introduction
This study used a rat model of osteoporosis to evaluate the role of the cerebral serotonin system in the anti-nociceptive effect of calcitonin, a drug used to treat post-menopausal osteoporosis.
Methods
Osteoporosis was induced in rats by ovariectomy (OVX). Rats were then randomized to the following four groups: sham operation, OVX, OVX plus calcitonin, or OVX plus alendronate.
Results
OVX led to alterations in bone micro-architecture; alendronate strongly reversed this effect, and calcitonin moderately reversed this effect. OVX increased hyperalgesia (determined as the time for hind paw withdrawal from a heat source); calcitonin reduced this effect, but alendronate had no effect. OVX increased the expression of c-Fos (a neuronal marker of pain) in the thalamus; calcitonin strongly reversed this effect, and alendronate moderately reversed this effect. OVX also reduced SERT but increased 5-HT1A receptor expression and activity; calcitonin aggravated this effect, but alendronate had no effect on recovery of SERT/5-HT1A activity and expression.
Conclusions
Our study of a rat model of osteoporosis suggests that OVX-induced enhancement of the serotonergic system may protect against hyperalgesia. However, the anti-nociceptive effects of calcitonin in osteoporosis may be mediated by decreased neural SERT activity and increased activation of 5-HT1 receptors in the thalamus.
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Acknowledgments
This research was partly supported by research grants to J.-F. Shyu from the National Defense Medical Center (MAB-102-56), the Tri-Service General Hospital (TSGH-C102-124), and the Ministry of Science and Technology (MOST 104-2320-B-016-008) of Taiwan.
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Yeh, CB., Weng, SJ., Chang, KW. et al. Calcitonin alleviates hyperalgesia in osteoporotic rats by modulating serotonin transporter activity. Osteoporos Int 27, 3355–3364 (2016). https://doi.org/10.1007/s00198-016-3652-1
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DOI: https://doi.org/10.1007/s00198-016-3652-1