Morphine and Orexin-A bidirectionally interact in rat NAc to modulate acute pain

The nucleus accumbens (NAc) is a critical brain region for integrating motivational, reward-related, and nociceptive information, playing a pivotal role in how pain is experienced. While both the opioidergic and orexinergic systems within the NAc are independently recognized for their involvement in pain modulation, the precise nature of their functional interaction during acute nociception has remained largely unexplored. Understanding this intricate crosstalk is essential for identifying novel therapeutic targets that could enhance the body's natural pain-relief mechanisms and potentially reduce reliance on conventional opioid analgesics.