Inflammation-induced depression: Its pathophysiology and therapeutic implications.

Area of Science:

• Neuroscience
• Immunology
• Biochemistry

Background:

• Depression pathophysiology involves inflammation, but not exclusively.
• The kynurenine (KYN) pathway of tryptophan (TRY) is a key factor in inflammation-induced depression.
• Impairment of the KYN pathway is noted in depression related to immunotherapy, autoimmune disease, and infection.

Purpose of the Study:

• To review evidence on the immune-KYN pathway's role in inflammation-induced depression.
• To explore the detrimental effects of TRY catabolites and KYN pathway enzymes.
• To investigate potential therapeutic strategies targeting KYN metabolism for depression.

Main Methods:

• Literature review of experimental evidence.
• Analysis of tryptophan metabolism and serotonin depletion.
• Examination of kynurenine pathway enzymes and catabolites.

Main Results:

• The KYN pathway is a significant pathogenic factor in inflammation-induced depression.
• Tryptophan catabolites and specific KYN pathway enzymes contribute to depression.
• Evidence supports the immune-KYN pathway's role in conditions like autoimmune disease and infection.

Conclusions:

• The KYN pathway is central to understanding inflammation-induced depression.
• Immunopharmacology targeting the immune-KYN pathway offers a potential therapeutic avenue.
• Further research is needed to establish clear evidence for developing targeted therapies.