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Molecular Insights into the Interaction of Tryptophan Metabolites with the Human Aryl Hydrocarbon Receptor : Tryptophan as Antagonist and no Direct Involvement of Kynurenine.
Front Biosci (Landmark Ed)
September 2024
Pharmacy and Allied Health Sciences, Iqra University, 7580 Karachi, Pakistan.
Background: A direct link between the tryptophan (Trp) metabolite kynurenine (Kyn) and the aryl hydrocarbon receptor (AhR) is not supported by metabolic considerations and by studies demonstrating the failure of Kyn concentrations of up to 100 μM to activate the receptor in cell culture systems using the proxy system of cytochrome 450-dependent metabolism. The Kyn metabolite kynurenic acid (KA) activates the AhR and may mediate the Kyn link. Recent studies demonstrated down regulation and antagonism of activation of the AhR by Trp.
View Article and Find Full Text PDFLight wavelengths that induce oxidation of oxymyoglobin in meat.
Meat Sci
January 2025
Central Research Institute, Itoham Yonekyu Holdings, Inc, Moriya, Japan.
Light wavelengths that induce meat discoloration and the photoreceptors in the meat were studied. We investigated the effects of the light wavelength on the oxidation rate of myoglobin (Mb) by exposing Mb extracts or model solutions containing Mb to light at specific wavelengths with a bandwidth of 5 nm using a fluorescence spectrophotometer. The wavelengths examined comprised 385, 415, 445, 460, 490, 525, 555, 580, 605, 630,660, and 750 nm.
View Article and Find Full Text PDFReveal the mechanism of hepatic oxidative stress in mice induced by photo-oxidation milk using multi-omics analysis techniques.
J Adv Res
July 2024
Key Laboratory of Geriatric Nutrition and Health (Beijing Technology and Business University), Ministry of Education, 100048, China. Electronic address:
Article Synopsis
- Photo-oxidation is identified as a major factor in degrading milk quality, which can pose health risks, yet its effects on human health have not been extensively studied.
- The study aims to explore how consuming photo-oxidized milk leads to oxidative stress in the liver using advanced multi-omics techniques in a mouse model.
- Results show that photo-oxidized milk significantly increases oxidative stress and causes liver damage in mice, affecting lipid metabolism and various metabolic pathways.
Photosynthetic control at the cytochrome b6f complex.
Plant Cell
October 2024
Plants, Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK.
Article Synopsis
- Photosynthetic control (PCON) protects plants from light-induced damage to Photosystem I (PSI) by balancing the production of NADPH and ATP with their use in CO2 fixation, which is crucial since plants can't quickly repair PSI.
- The process is regulated by the transthylakoid ΔpH levels, which increase when there's excess light, allowing PCON to manage the electron flow at a specific point during linear electron transfer (LET).
- This review focuses on angiosperms, examining how PSI damage affects photosynthesis and growth, recent findings on PCON regulation, and the potential for enhancing photosynthetic efficiency in crops through manipulation of this protective mechanism.
Prefrontal photobiomodulation produces beneficial mitochondrial and oxygenation effects in older adults with bipolar disorder.
Front Neurosci
October 2023
Department of Psychology, The University of Texas at Austin, Austin, TX, United States.
There is growing evidence of mitochondrial dysfunction and prefrontal cortex (PFC) hypometabolism in bipolar disorder (BD). Older adults with BD exhibit greater decline in PFC-related neurocognitive functions than is expected for age-matched controls, and clinical interventions intended for mood stabilization are not targeted to prevent or ameliorate mitochondrial deficits and neurocognitive decline in this population. Transcranial infrared laser stimulation (TILS) is a non-invasive form of photobiomodulation, in which photons delivered to the PFC photo-oxidize the mitochondrial respiratory enzyme, cytochrome-c-oxidase (CCO), a major intracellular photon acceptor in photobiomodulation.
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