Abstract
To clarify the role of angiotensin II (Ang II) in the regulation of sensory signaling, we studied the effect of subpressor dose (150 ng/kg/min) of Ang II on pain-related behavior in relation with neuronal injury and activation of satellite glial cells (SGCs) in the dorsal root ganglia (DRGs) after chronic constriction injury (CCI). Systemic continuous delivery of Ang II induced the tactile, heat and cold hyperlagesia, when measured at 7 days ofpost-injury. Blockade of the AT1 receptor with losartan (2.5 mg/kg/day) prevented tactile hyperalgesia and attenuated cold hyperalgesia, but did not affect the response to noxious heat stimulus. A marked increase of large-sized injured primary afferent neurons, detected by ATF3 immunolabeling, was seen in lower lumbar DRGs on ipsilateral side after Ang II treatment. Subpressor dose of Ang II induced an increase of activated SGCs (detected by GFAP immunolabeling) enveloping large-diameter neurons. Our results suggested that Ang II through the AT1 receptor activation is an important regulatory factor in neuropathic pain perception and plays an important role in the injury of large-sized primary afferent neurons and activation of SGCs elicited by the CCI.
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Acknowledgments
The authors thank Mrs. I. Vrabelova for technical assistance. The study was supported by the VEGA Grants No. 2/0203/10 and No. 2/0191/13, APVV Grant No. 0314-06 and CE NOREG from the Slovak Academy of Sciences, and by ITMS 26220220127 supported by the Research & Development Operational Programme funded by the ERDF.
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Pavel, J., Oroszova, Z., Hricova, L. et al. Effect of Subpressor Dose of Angiotensin II on Pain-Related Behavior in Relation with Neuronal Injury and Activation of Satellite Glial Cells in the Rat Dorsal Root Ganglia. Cell Mol Neurobiol 33, 681–688 (2013). https://doi.org/10.1007/s10571-013-9934-7
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DOI: https://doi.org/10.1007/s10571-013-9934-7