PSYCH 011: Intraneuronal Signalling

While synapses transmit signals between neurons, the real transformation happens within. This chapter explores intraneuronal signalling - the complex cascade of intracellular processes that determine how a neuron responds to incoming information.In this episode, we move inside the neuron to examine how signals are not simply received, but interpreted. Neurotransmitters bind to receptors, triggering intracellular pathways involving second messengers, protein kinases, and gene transcription. These cascades shape everything from immediate responses to long-term changes in structure and function.We explore how the same external signal can produce different outcomes depending on the internal state of the neuron. Context matters - receptor subtype, intracellular environment, and prior activity all influence how a signal is processed.This is where short-term communication becomes long-term adaptation. Intraneuronal signalling underpins plasticity, learning, and memory, but also vulnerability. Dysregulation at this level can alter how information is processed, contributing to psychiatric conditions in ways that are not visible at the level of synapses alone.This chapter reveals a deeper layer of complexity: the brain is not just a network of connections, but a system of interpretive units, each transforming signals into meaning.Key Takeaways* Intraneuronal signalling involves intracellular cascades triggered by receptor activation.* Second messengers and protein kinases play key roles in signal transduction.* Neurons interpret signals rather than simply transmitting them.* The same neurotransmitter can produce different effects depending on intracellular context.* These processes link short-term signalling to long-term changes such as gene expression and plasticity.* Dysregulation can alter how signals are processed, contributing to psychiatric disorders.* Understanding intracellular pathways is key to deeper mechanistic insight in psychiatry. 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