User:Rob Hurt/Retrograde neurotransmission
In neuroscience, retrograde neurotransmission is the process by which a retrograde neurotransmitter is released by a postsynaptic dendrite or cell body, and travels backwards across a chemical synapse to bind to the presynaptic neuron.[1] The primary purpose of retrograde neurotransmission is regulation of neurotransmission.[1] For this reason, retrograde neurotransmission allows neural circuits to create feedback loops.
Formal definition of a retrograde neurotransmitter
[edit]In 2009, Regehr et al. proposed criteria for defining retrograde neurotransmitters. According to their work, a signaling molecule can be considered a retrograde neurotransmitter if it satisfies all of the following criteria:[1]
- The appropriate machinery for synthesizing and releasing the retrograde messenger must be located in the postsynaptic neuron
- Disrupting the synthesis and/or release of the messenger from the postsynaptic neuron must prevent retrograde signaling
- The appropriate targets for the retrograde messenger must be located in the presynaptic bouton
- Disrupting the targets for the retrograde messenger in the presynaptic boutons must eliminate retrograde signaling
- Exposing the presynaptic bouton to the messenger should mimic retrograde signaling provided the presence of the retrograde messenger is sufficient for retrograde signaling to occur
- In cases where the retrograde messenger is not sufficient, pairing the other factor(s) with the retrograde signal should mimic the phenomenon
Types of retrograde neurotransmitters
[edit]The most prevalent endogenous retrograde neurotransmitters are nitric oxide and various cannabinoids.
References
[edit]- ^ a b c Regehr, Wade G.; Carey, Megan R.; Best, Aaron R. (30 July 2009). "Activity-Dependent Regulation of Synapses by Retrograde Messengers". Neuron. 63 (2): 154–170. doi:10.1016/j.neuron.2009.06.021. PMC 3251517. PMID 19640475.