pharmacy Notes on Serotonin, Neurotransmission, and Molecular Processes

Serotonin and Its Effects

  • Serotonin has beneficial impacts over the long term when one is under its influence.

Prolonged Activation of Receptors

  • Prolonged activation of receptors leads to changes in receptor sensitivity.
  • Key Point: The changes discussed relate to nuclear proteins.

Nuclear Proteins

  • These proteins remain within the nucleus.
  • They play a critical role in processes such as transcription and translation.
Cytoplasmic Proteins
  • Nuclear cytoplasmic proteins are ubiquitous and essential for translating mRNA to proteins.

Ribosomes and Their Types

  • There are major categories of ribosomes important for protein synthesis.

Freight Polyzones

  • Definition: Freight polyzones are a type of ribosome that translates mRNA specifically into proteins that will not be used in the cytoplasm outside the nucleus.
  • Relation to Genomic Activation: They are involved in the process following genomic activation.
  • Example: Vesicles, which have a phospholipid bilayer.
Vesicles
  • Structure: Cell vesicles are composed of various proteins, represented visually in diagrams as orange.
  • Composition: Vesicles are constructed from about 13 actin filaments aggregated together.
  • Function: Microtubules enable the transportation of proteins within the cell.

Neurotransmission Processes

  • There are three major types of neurotransmission processes through which ligands are delivered:
    1. Classic neurotransmission
    2. Retrograde neurotransmission
    3. Ballistic neurotransmission

Mechanisms of Synaptic Communication

  • The synapse is the primary mechanism for neurotransmission.
  • Distance: The typical distance across a synapse is about 2.5 to 3 nanometers.
    • Synapses are not empty gaps or hollows; they are filled with microfilaments and proteins that help anchor the membranes together, facilitating effective communication.
Importance of Synaptic Structure
  • The structure of synapses enables discrete and clear messaging, critical for effective neurotransmission.

Conclusion

  • Classic neurotransmission can occur through neural circuits, establishing a network of interconnected neurons, highlighting that not only neurons A and B are involved.