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Depressive Disorders: Etiology01:27

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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Late-Onset Depression in an Aging World: A Multidimensional Perspective on Risks, Mechanisms, and Treatment.

Antonio Maria D'Onofrio1, Gaspare Filippo Ferrajoli2, Lodovico Maria Balzoni1

  • 1Department of Neuroscience, Section of Psychiatry, Università Cattolica del Sacro Cuore, 00168 Rome, Italy.

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Summary

Late-onset depression (LOD) is a distinct subtype of late-life depression, characterized by apathy, cognitive issues, and links to dementia risk. Integrated care addressing biological and psychosocial factors is crucial for effective treatment in aging populations.

Keywords:
ageinglate-life depressionlate-onset depressionneuroinflammationvascular depression

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Area of Science:

  • Geriatric Psychiatry
  • Neuroscience
  • Epidemiology

Background:

  • Late-onset depression (LOD) is a unique clinical and biological presentation of depression in older adults.
  • It is increasingly recognized due to global population aging.
  • LOD is associated with distinct symptoms and increased risk for other health conditions.

Purpose of the Study:

  • To synthesize current evidence on the epidemiology, risk factors, and treatment of LOD.
  • To integrate biological, psychological, and social dimensions of LOD.
  • To inform clinical practice and future research for this specific patient group.

Main Methods:

  • This study conducted a narrative review of recent scientific literature.
  • It synthesized evidence on epidemiology, clinical features, neurobiology, and treatment of LOD.
  • Findings from the broader late-life depression literature were incorporated where relevant.

Main Results:

  • LOD is a distinct entity, presenting with apathy, psychomotor slowing, and cognitive impairment.
  • It is linked to frailty, medical comorbidities, and elevated dementia risk.
  • Key pathophysiological mechanisms involve vascular, inflammatory, oxidative, and neuroplasticity pathways, influenced by psychosocial factors.

Conclusions:

  • Late-onset depression is a distinct subtype of late-life depression requiring integrated, personalized care.
  • Effective treatment necessitates addressing neurovascular mechanisms and psychosocial adversity.
  • Coordinated geriatric and psychiatric strategies are vital for improving outcomes in aging populations.