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Depression: Overview01:18

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
Long-term Depression01:05

Long-term Depression

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.
Long-term Depression01:03

Long-term Depression

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.
Calcium Ion Concentration Mechanism
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Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
Antidepressant Drugs: Overview01:25

Antidepressant Drugs: Overview

Antidepressant drugs are a class of medications primarily used for treating various mood disorders, including major depression, anxiety disorders, and other related conditions. These medicines work by modulating the neurotransmitter balance within the brain, alleviating depressive symptoms. Antidepressants can be broadly categorized into several groups according to their mechanism of action and chemical structure: Selective Serotonin Reuptake Inhibitors (SSRIs), Serotonin-Norepinephrine...
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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Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...

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Related Experiment Video

Updated: May 24, 2026

The Forced Swim Test as a Model of Depressive-like Behavior
05:42

The Forced Swim Test as a Model of Depressive-like Behavior

Published on: March 2, 2015

Nature against depression.

A T El-Alfy1, E A Abourashed, R R Matsumoto

  • 1Department of Pharmaceutical Sciences, College of Pharmacy, Chicago State University, IL 60628-1598, USA. ael-alfy@csu.edu

Current Medicinal Chemistry
|March 15, 2012
PubMed
Summary
This summary is machine-generated.

This review explores herbal medicines for depression, highlighting St. John's wort and saffron. It examines their effectiveness and potential as natural antidepressants.

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Last Updated: May 24, 2026

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Area of Science:

  • Pharmacology
  • Natural Products
  • Integrative Medicine

Background:

  • Depression is a global health issue with significant morbidity.
  • Current antidepressants have limitations like slow action, poor efficacy, and side effects.
  • Growing interest in herbal remedies for depression due to dissatisfaction with conventional treatments.

Purpose of the Study:

  • To review current knowledge on natural products for depression.
  • To evaluate herbal medicines used in clinical trials and animal models.
  • To provide a comprehensive overview of chemical, pharmacological, and clinical data.

Main Methods:

  • Literature review of preclinical and clinical studies.
  • Analysis of herbal medicines including St. John's wort, saffron, Rhodiola, and others.
  • Inclusion of emerging products and marine-derived natural products.

Main Results:

  • Several herbal medicines show promise for treating mild to moderate depression.
  • Clinical trials support the use of St. John's wort and saffron.
  • Preclinical studies indicate antidepressant potential in various plant and marine-derived compounds.

Conclusions:

  • Herbal medicines represent a viable alternative or adjunct therapy for depression.
  • Further research is needed to fully understand the efficacy and safety of these natural products.
  • Natural products offer a promising avenue for developing novel antidepressant treatments.