What neurotransmitter is central to the modern biologic hypothesis of schizophrenia?

What neurotransmitter is central to the modern biologic hypothesis of schizophrenia?

• A. Dopamine
• B. Gamma-aminobutyric acid
• C. Glutamate
• D. Serotonin

Answer: (A)

Dopamine is central to the modern biologic view of schizophrenia. The positive symptoms like delusions and hallucinations are linked to increased dopamine activity in the mesolimbic pathway. This is supported by the clinical action of antipsychotic medications, which block D2 dopamine receptors and often reduce positive symptoms in proportion to how much receptor occupancy they achieve. Pharmacology also reinforces the idea: drugs that boost dopamine release, such as amphetamine, can precipitate or worsen psychosis, while drugs that dampen dopamine signaling tend to alleviate symptoms. There’s more nuance, though—dopamine functioning differs across pathways. Reduced dopaminergic activity in the mesocortical pathway may relate to negative symptoms and cognitive difficulties, illustrating a dysregulated system rather than a simple excess everywhere. Other neurotransmitters like glutamate, GABA, and serotonin interact with this dopaminergic framework and contribute to the full picture, but dopamine remains the central element driving the core biologic hypothesis.

Dopamine is central to the modern biologic view of schizophrenia. The positive symptoms like delusions and hallucinations are linked to increased dopamine activity in the mesolimbic pathway. This is supported by the clinical action of antipsychotic medications, which block D2 dopamine receptors and often reduce positive symptoms in proportion to how much receptor occupancy they achieve. Pharmacology also reinforces the idea: drugs that boost dopamine release, such as amphetamine, can precipitate or worsen psychosis, while drugs that dampen dopamine signaling tend to alleviate symptoms. There’s more nuance, though—dopamine functioning differs across pathways. Reduced dopaminergic activity in the mesocortical pathway may relate to negative symptoms and cognitive difficulties, illustrating a dysregulated system rather than a simple excess everywhere. Other neurotransmitters like glutamate, GABA, and serotonin interact with this dopaminergic framework and contribute to the full picture, but dopamine remains the central element driving the core biologic hypothesis.