Analgesia (supraspinal and spinal) is mediated by which receptor combination?

Analgesia (supraspinal and spinal) is mediated by which receptor combination?

• A. mu, kappa, and delta opioid receptors
• B. mu1 opioid receptors
• C. mu2 opioid receptors
• D. delta opioid receptors

Answer: (A)

Analgesia produced by opioids involves activating multiple receptor types in the central nervous system. Both supraspinal (brain) and spinal (dorsal horn) pathways use mu, kappa, and delta opioid receptors to produce pain relief. The mu receptor family is the main driver of analgesia, but kappa and delta receptors also contribute, influencing the overall magnitude and quality of relief as well as other effects. Because all three receptor families participate in mediating analgesia at both levels, the best answer reflects this combined involvement. If you think about it, relying on just one receptor subtype would miss part of the pain-relieving effects you can achieve pharmacologically. For example, delta receptors modulate and fine-tune analgesia, and kappa receptors provide spinal analgesia with a different side-effect profile. Together, their activation accounts for analgesia that spans both brain and spinal cord.

Analgesia produced by opioids involves activating multiple receptor types in the central nervous system. Both supraspinal (brain) and spinal (dorsal horn) pathways use mu, kappa, and delta opioid receptors to produce pain relief. The mu receptor family is the main driver of analgesia, but kappa and delta receptors also contribute, influencing the overall magnitude and quality of relief as well as other effects. Because all three receptor families participate in mediating analgesia at both levels, the best answer reflects this combined involvement.

If you think about it, relying on just one receptor subtype would miss part of the pain-relieving effects you can achieve pharmacologically. For example, delta receptors modulate and fine-tune analgesia, and kappa receptors provide spinal analgesia with a different side-effect profile. Together, their activation accounts for analgesia that spans both brain and spinal cord.