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Oxytocin (OXT), which is a well-known neurohypophysial hormone that is synthesized in the paraventricular (PVN) and supraoptic nuclei (SON) of the hypothalamus, is secreted from the posterior pituitary (PP) into the systemic circulation, where it plays an essential role in reproduction, especially during and after childbirth. Many recent studies have shown that OXT contributes to the modulation of several functions, such as social recognition, trust building, anti-nociception, anti-inflammation, stress relief and suppression of feeding. However, little is known about the neuronal networks responsible for OXT effects. Endogenious OXT has two regulations: the 1st regulation is humoral regulation, in which OXT is delivered to target organs from PP via the bloodstream; the 2nd regulation is nerve regulations, in which OXT from parvocellular neurosecretory neurons in the PVN directly project to the central nerve system (CNS). OXT binding sites, as well as OXT receptor expression, are located in various regions of the CNS, including the dorsal horn of spinal cord in rats, where it plays an important role in nociception. We examined the response to acute and chronic nociception/-inflammation in rat models using OXT-monomeric red fluorescent protein 1 (mRFP1) transgenic rats. We used formalin test as acute nociceptive/-inflammatory rat models and adjuvant arthritis as chronic nociceptive/-inflammatory rat models. We studied the effects of acute and chronic nociception/-inflammation on OXT-mRFP1 expression in the hypothalamus, posterior pituitary and spinal cord, and examined the role that OXT plays in acute and chronic nociceptive responses in rats. This review focuses on pain modulation and anti-inflammation by OXT according to previous clinical and animal research.

Relationship Between Oxytocin and Pain Modulation and Inflammation