The Effect of Nimodipine on Calcium Homeostasis and Pain Sensitivity in Diabetic Rats
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1. The pathogenesis of diabetic neuropathy is a complex phenomenon, the mechanisms of which are not fully understood. Our previous studies have shown that the intracellular calcium signaling is impaired in primary and secondary nociceptive neurons in rats with streptozotocin (STZ)-induced diabetes. Here, we investigated the effect of prolonged treatment with the L-type calcium channel blocker nimodipine on diabetes-induced changes in neuronal calcium signaling and pain sensitivity.
2. Diabetes was induced in young rats (21 p.d.) by a streptozotocin injection. After 3 weeks of diabetes development, the rats were treated with nimodipine for another 3 weeks. The effect of nimodipine treatment on calcium homeostasis in nociceptive dorsal root ganglion neurons (DRG) and substantia gelatinosa (SG) neurons of the spinal cord slices was examined with fluorescent imaging technique.
3. Nimodipine treatment was not able to normalize elevated resting intracellular calcium ([Ca2+] i ) levels in small DRG neurons. However, it was able to restore impaired Ca2+ release from the ER, induced by either activation of ryanodine receptors or by receptor-independent mechanism in both DRG and SG neurons.
4. The beneficiary effects of nimodipine treatment on [Ca2+] i signaling were paralleled with the reversal of diabetes-induced thermal hypoalgesia and normalization of the acute phase of the response to formalin injection. Nimodipine treatment was also able to shorten the duration of the tonic phase of formalin response to the control values.
5. To separate vasodilating effect of nimodipine Biessels et al., (Brain Res. 1035:86–93) from its effect on neuronal Ca2+ channels, a group of STZ-diabetic rats was treated with vasodilator – enalapril. Enalapril treatment also have some beneficial effect on normalizing Ca2+ release from the ER, however, it was far less explicit than the normalizing effect of nimodipine. Effect of enalapril treatment on nociceptive behavioral responses was also much less pronounced. It partially reversed diabetes-induced thermal hypoalgesia, but did not change the characteristics of the response to formalin injection.
6. The results of this study suggest that chronic nimodipine treatment may be effective in restoring diabetes-impaired neuronal calcium homeostasis as well as reduction of diabetes-induced thermal hypoalgesia and noxious stimuli responses. The nimodipine effect is mediated through a direct neuronal action combined with some vascular mechanism.
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- The Effect of Nimodipine on Calcium Homeostasis and Pain Sensitivity in Diabetic Rats
Cellular and Molecular Neurobiology
Volume 26, Issue 7-8 , pp 1539-1555
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- Kluwer Academic Publishers-Plenum Publishers
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- dorsal horn neurons
- dorsal root ganglion
- endoplasmic reticulum
- Industry Sectors
- Author Affiliations
- 1. Bogomoletz Institute of Physiology, Kiev, Ukraine
- 3. The first two authors contributed equally to this work, Kiev, Ukraine
- 2. International Center of Molecular Physiology, Kiev, Ukraine
- 4. Bogomoletz Institute of Physiology, 4 Bogomoletz St., Kiev, Ukraine, 01024