Curcumin treatment leads to better cognitive and mood function in a model of Gulf War Illness with enhanced neurogenesis, and alleviation of inflammation and mitochondrial dysfunction in the hippocampus

• Published in: Brain, behavior, and immunity Vol. 69; pp. 499 - 514
• Main Authors: Kodali, M., Hattiangady, B., Shetty, G.A., Bates, A., Shuai, B., Shetty, A.K.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Inc 01.03.2018
• Subjects: Affect - drug effects; Animals; Anti-Inflammatory Agents, Non-Steroidal - pharmacology; Anti-Inflammatory Agents, Non-Steroidal - therapeutic use; Cognition - drug effects; Curcumin; Curcumin - pharmacology; Curcumin - therapeutic use; DEET; Disease Models, Animal; Gulf War Illness; Hippocampal neurogenesis; Hippocampus - drug effects; Hippocampus - metabolism; Inflammation - drug therapy; Inflammation - metabolism; Inflammation - psychology; Male; Memory impairment; Mitochondria; Mitochondria - drug effects; Mitochondria - metabolism; Mood dysfunction; Neurogenesis - drug effects; Neuroinflammation; Oxidative stress; Oxidative Stress - drug effects; Permethrin; Persian Gulf Syndrome - chemically induced; Persian Gulf Syndrome - drug therapy; Persian Gulf Syndrome - metabolism; Persian Gulf Syndrome - psychology; Rats; Reactive oxygen species; Memory impairment; Oxidative stress; Mitochondria; Reactive oxygen species; Mood dysfunction; Gulf War Illness; Hippocampal neurogenesis; Neuroinflammation; Curcumin
• ISSN: 0889-1591; 1090-2139
• DOI: 10.1016/j.bbi.2018.01.009

•Curcumin maintains better cognitive and mood function in a model of Gulf War Illness.•Curcumin alleviates neuroinflammation in a model of Gulf War Illness.•Curcumin enhances hippocampal neurogenesis in a model of Gulf War Illness.•Curcumin normalizes mitochondrial function in a model of Gulf War Illness.•Curcumin enhances the expression of genes that encode antioxidant activity. Diminished cognitive and mood function are among the most conspicuous symptoms of Gulf War Illness (GWI). Our previous studies in a rat model of GWI have demonstrated that persistent cognitive and mood impairments are associated with substantially declined neurogenesis, chronic low-grade inflammation, increased oxidative stress and mitochondrial dysfunction in the hippocampus. We tested the efficacy of curcumin (CUR) to maintain better cognitive and mood function in a rat model of GWI because of its neurogenic, antiinflammatory, antioxidant, and memory and mood enhancing properties. Male rats were exposed daily to low doses of GWI-related chemicals, pyridostigmine bromide, N,N-diethyl-m-toluamide (DEET) and permethrin, and 5-minutes of restraint stress for 28 days. Animals were next randomly assigned to two groups, which received daily CUR or vehicle treatment for 30 days. Animals also received 5′-bromodeoxyuridine during the last seven days of treatment for analysis of neurogenesis. Behavioral studies through object location, novel object recognition and novelty suppressed feeding tests performed sixty days after treatment revealed better cognitive and mood function in CUR treated GWI rats. These rats also displayed enhanced neurogenesis and diminished inflammation typified by reduced astrocyte hypertrophy and activated microglia in the hippocampus. Additional studies showed that CUR treatment to GWI rats enhanced the expression of antioxidant genes and normalized the expression of multiple genes related to mitochondrial respiration. Thus, CUR therapy is efficacious for maintaining better memory and mood function in a model of GWI. Enhanced neurogenesis, restrained inflammation and oxidative stress with normalized mitochondrial respiration may underlie better memory and mood function mediated by CUR treatment.