In pain pathways, Substance P is often co-released with which excitatory neurotransmitter?

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Multiple Choice

In pain pathways, Substance P is often co-released with which excitatory neurotransmitter?

In pain pathways, signaling relies on both a fast excitatory transmitter and a neuropeptide that boosts that signal. Substance P is a peptide released from nociceptive fibers along with glutamate, the main excitatory neurotransmitter in these pathways. Glutamate activates AMPA and NMDA receptors on dorsal horn neurons, producing quick excitation, while Substance P binds to NK1 receptors to enhance and prolong the signal. This co-release helps amplify pain transmission and can contribute to sensitization. GABA and glycine are inhibitory neurotransmitters, so they serve to dampen rather than amplify pain signals, which is why they aren’t the typical partners with Substance P in this context. Aspartate is another excitatory amino acid, but it is not the primary co-transmitter associated with Substance P in pain pathways.

In pain pathways, signaling relies on both a fast excitatory transmitter and a neuropeptide that boosts that signal. Substance P is a peptide released from nociceptive fibers along with glutamate, the main excitatory neurotransmitter in these pathways. Glutamate activates AMPA and NMDA receptors on dorsal horn neurons, producing quick excitation, while Substance P binds to NK1 receptors to enhance and prolong the signal. This co-release helps amplify pain transmission and can contribute to sensitization.

GABA and glycine are inhibitory neurotransmitters, so they serve to dampen rather than amplify pain signals, which is why they aren’t the typical partners with Substance P in this context. Aspartate is another excitatory amino acid, but it is not the primary co-transmitter associated with Substance P in pain pathways.

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