PSYCH 009: Novel Neurotransmitters

For decades, psychiatry has centred on a core set of neurotransmitters - dopamine, serotonin, noradrenaline. Yet the brain’s chemical language is far richer than once imagined. This chapter explores emerging and “novel” neurotransmitters that challenge traditional models and open new pathways for understanding and treatment.In this episode, we examine systems such as glutamatergic modulation beyond classical pathways, endocannabinoids, nitric oxide, and other unconventional signalling molecules. These do not always conform to the standard rules of neurotransmission - some act retrogradely, some diffuse freely, and others influence entire systems without clear synaptic boundaries.We explore how these systems contribute to plasticity, perception, mood regulation, and stress response. Their roles are often subtle but profound - shaping how signals are filtered, integrated, and prioritised.Importantly, these discoveries are reshaping psychiatric treatment. The emergence of agents targeting glutamate systems, for example, has transformed approaches to conditions such as depression, moving beyond traditional monoamine frameworks.This chapter represents a frontier - a reminder that our current models are incomplete, and that the biology of the mind is still being uncovered.Key Takeaways* Novel neurotransmitters expand beyond classical monoamine and amino acid systems.* These include endocannabinoids, nitric oxide, and advanced glutamatergic mechanisms.* Some act in unconventional ways (e.g. retrograde signalling, diffusion-based transmission).* They play roles in plasticity, mood regulation, perception, and stress response.* These systems challenge traditional models of neurotransmission.* Emerging treatments increasingly target these pathways (e.g. glutamate modulation).* Psychiatry is evolving as new biological mechanisms are discovered. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe