They are organized into domains according to the combination of transcription factors that confer them functional specificities (Merkle et al., 2014
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Abbreviations BBB: Bloodbrain barrier CFS: Chronic fatigue syndrome CNS: Central nervous system CoA: Coenzyme A COVID-19: Coronavirus disease 2019 CrAT: Carnitine acetyltransferase CRP: C-reactive protein HPA: Hypothalamicpituitaryadrenal IDO: Indoleamine 2,3-dioxygenase IL-2: Interleukin-2 IMD: Immunometabolic depression MDD: Major depressive disorder ME: Myalgic encephalomyelitis mGluR2: Metabotropic glutamate receptor 2 MS: Multiple sclerosis NMDA: N -Methyl-d-aspartate NMR: Nuclear magnetic resonance Nrf2: Nuclear factor erythroid 2-related factor 2 OCTN2: Organic cation novel type 2 transporter OCT1: Organic cation transporter 1 PAIS: Post-acute infection syndromes PASC: Post-acute sequelae of SARS-CoV-2 infection PDC: Pyruvate dehydrogenase complex PGD2S: Prostaglandin D2 synthase gene QUIN: Quinolinic acid ROS: Reactive oxygen species Trp: Tryptophan TCA: Tricarboxylic acid HO-1: Heme oxygenase 1 PUFAs: Polyunsaturated fatty acids CACT: Carnitine-acylcarnitine translocase MRI: Magnetic resonance imaging [ 18 F]FDG-PET/CT: [ 18 F]Fluorodeoxyglucose positron emission tomography/computed tomography References Abraham NG, Kappas A (2008) Pharmacological and clinical aspects of heme oxygenase

This "cellular cleanup" mechanism is vital for reducing the oxidative stress and neuroinflammation that contribute to the cognitive dysfunction, or "brain fog," so frequently reported in Long COVID
Taken together, our results suggested that the OCCT may serve as a robust tool to identify TMAO-generating phenotypes from carnitine metabolism and to explore relevant microbiome signatures in humans
The authors reported that in obese mice, daily AOD-9604 administration over 14 days produced significant reductions in body weight gain, decreases in adipose tissue mass, and increases in fat oxidation, with effect sizes comparable to those of full-length human growth hormone [1]