Abstract
Perinatal depression is a prevalent mental disorder among pregnant women, characterized by sleep disturbances, appetite changes, negative emotions, cognitive impairment, and suicidal or homicidal tendencies. These symptoms severely compromise personal well-being, disrupt family life, and burden society. Early detection and intervention are thus crucial. The tryptophan-kynurenine (TRP-KYN) pathway is central to the inflammatory hypothesis of depression and has gained significant attention in perinatal depression research. This pathway encompasses numerous metabolic enzymes and neuroactive metabolites that interact with other physiological systems, influencing neurotransmitter synthesis and neuronal development. Through these interactions, the TRP-KYN pathway exerts psychotropic effects. This article reviews the key metabolites and enzymes of the TRP-KYN pathway and examines its intersection with immune inflammation, hormones, and gut microbiota.
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