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Abstract
The hypothalamic paraventricular nuclei (PVN) inhibits spinal nociception. Furthermore, projections from the PVN to other structures related to pain modulation exist, but a functional interaction has not yet been fully demonstrated. As an initial approach, we show here that PVN electric stimulation with the same parameters used to induce analgesia in rats enhances c-Fos expression not only in the dorsal horn of the spinal cord but also in the nucleus raphe magnus, locus coeruleus and the periaqueductal gray area. These results suggest that a functional interaction between these structures could occur, possibly to assure a mechanism of endogenous analgesia.
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