LTP and LTD

Synaptic Tag and Capture

  • Definition and Context

    • Synaptic tag and capture refers to the process by which a weak memory can become strong through synaptic mechanisms.

    • This involves synapses that undergo Long-Term Potentiation (LTP) being capable of stealing AMPA receptors from other synapses.

Long-Term Potentiation (LTP) and Long-Term Depression (LTD)

  • Key Concepts Discussed

    • Interaction of calcium ions in neuronal signaling pathways and their impact on mRNA and transcription factors.

    • Maria's question: How do PREV one and PREV two relate to LTP?

    • Calcium initiates signaling pathways that recruit CREB (cAMP response element-binding protein) to RNA.

    • CREB is a transcription factor that regulates the genes for AMPA receptors important for LTP.

    • Mentioned that there are different signaling pathways and transcription factors involved in synaptic changes.

Synaptogenesis

  • Definition and Explanation

    • Synaptogenesis is the formation of new synapses, which is generally accompanied by an increase in AMPA receptor presence in the membrane and new dendritic spine formation.

  • Inducers of Synaptogenesis

    • Aerobic Exercise: The most studied activity known to induce synaptogenesis.

    • Reference to experiments with mice and rats using running wheels, showing that aerobic activity leads to an increase in synapses in the hippocampus.

    • Encouragement to think about if pets (like guinea pigs or hamsters) exhibit similar behaviors when provided with exercise opportunities.

Potential Downsides of Excess PREV One

  • Discussion on detrimental effects of excessive PREV one.

    • Theoretical outcomes of too much memory formation and the necessity of balance between synaptic strengthening and weakening for optimal memory function.

Mental Illness - Explanation and Discussion

  • Broad Question: What is mental illness?

    • Jordan's definition focused on abnormal brain function; Lily suggested it's a result of brain dysfunction.

    • Students discussed concepts of maladaptive behaviors being tied to mental health definitions.

  • Connection between mental health and life quality

    • Julian emphasized that mental illnesses negatively impact quality of life.

    • Kylie brought up how maladaptive behaviors are part of the conversation on mental health abnormalities.

  • Discussions on whether mental illnesses can develop within the brain, noting that not all brain abnormalities signify mental illness.

Distinctions Between Mental and Physical Illness

  • Discussion on differences and similarities between mental illnesses (like depression or anxiety) and physical illnesses (like diabetes or cancer).

    • Gabrielle emphasized measurable aspects of physical illness, while mental illness lacks clear metrics.

    • Jason noted psychosocial treatments for mental illness compared to biological treatments for physical illnesses.

    • Recognition that physical and mental conditions can influence each other, as suggested by Raquelet.

Sigmund Freud and Psychotherapy

  • Insight on Freud as a pioneer in recognizing the medical basis of mental issues.

    • Freud's concepts such as the Oedipus complex and psychoanalysis were discussed, noting they might be considered outdated.

    • Psychoanalysis aims to uncover latent issues from a person’s past that manifest in adulthood as mental health problems.

Modern Understanding of Mental Illness

  • Introduction to the idea of molecular medicine in researching mental health.

    • Recognizes that many mental illnesses have a genetic component, meaning susceptibility can be inherited.

    • Discussion on the ethical implications of genetic engineering in treating mental health issues, emphasizing complex genetics and environmental factors.

Specific Discussion on Anxiety Disorders

  • Definition of Anxiety: A manifestation of fear that can be prolonged and not linked to an immediate threat.

  • Types of Anxiety Disorders Mentioned

    • Generalized Anxiety Disorder (GAD)

    • Phobias

    • Panic disorders

    • Other disorders (like PTSD and OCD) that have anxiety components.

  • Biological Basis of Anxiety Disorders

    • Linked to dysregulated stress responses, particularly involving the Hypothalamic-Pituitary-Adrenal (HPA) axis.

    • The role of the hypothalamus and brain structures such as the amygdala and hippocampus in regulating stress responses.

Treatments for Anxiety Disorders

  • Major Drug Class: Benzodiazepines (referred to as benzos)

    • Examples include Lorazepam, Valium, Klonopin, Ativan, Xanax.

    • Mechanism of action involves GABA receptor activation, leading to increases in chloride ion permeability, hyperpolarizing the neuron and decreasing neuronal excitability.

  • Data about Benzodiazepine (Benzo) Use

    • Higher prescription rates among older women, with increasing deaths associated with benzodiazepines, especially among males.

Conclusion

  • Acknowledgment of complexity in mental health treatment and the ongoing conversations surrounding prescription practices for anxiety and other mental disorders.