Which neurotransmitters are most implicated in depression and anxiety, and how do SSRIs affect their function?

Which neurotransmitters are most implicated in depression and anxiety, and how do SSRIs affect their function?

• A. Serotonin, norepinephrine, and dopamine are implicated; SSRIs block serotonin reuptake, increasing signaling.
• B. GABA and glutamate; SSRIs increase GABA.
• C. Acetylcholine; SSRIs increase acetylcholine.
• D. Endorphins; SSRIs decrease endorphins.

Answer: (A)

Mood disorders are tied to monoamine systems, especially serotonin, along with norepinephrine and dopamine, which help regulate mood and anxiety. The way SSRIs work is by blocking the transporter that reuptakes serotonin into the presynaptic neuron, so more serotonin stays in the synapse and can signal the postsynaptic receptors. This boost in serotonin signaling, developed over several weeks, is what helps alleviate depressive and anxious symptoms. The other neurotransmitters listed aren’t the primary targets of SSRIs—GABA and glutamate are involved in anxiety in other ways and are influenced by different drugs; acetylcholine and endorphins aren’t the main players in how SSRIs treat mood disorders.

Mood disorders are tied to monoamine systems, especially serotonin, along with norepinephrine and dopamine, which help regulate mood and anxiety. The way SSRIs work is by blocking the transporter that reuptakes serotonin into the presynaptic neuron, so more serotonin stays in the synapse and can signal the postsynaptic receptors. This boost in serotonin signaling, developed over several weeks, is what helps alleviate depressive and anxious symptoms. The other neurotransmitters listed aren’t the primary targets of SSRIs—GABA and glutamate are involved in anxiety in other ways and are influenced by different drugs; acetylcholine and endorphins aren’t the main players in how SSRIs treat mood disorders.