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Mitochondrial dysfunction signatures in idiopathic primary male infertility: a validated proteomics-based diagnostic approach.
Front Reprod Health
December 2024
Glickman Urological Institute, Cleveland Clinic Foundation, Cleveland, OH, United States.
Research Question: Male infertility accounts for almost half of all infertility cases worldwide, with idiopathic male infertility accounting for up to 30% of the cases. Sperm proteomics has revealed critical molecular pathway changes in men with infertility. However, the sperm mitochondrial proteome remains poorly understood.
View Article and Find Full Text PDFSelf-assembly of ZnO-Biochar/Kaolinite/Chitosan/GO with 1D/2D/3D heterojunctions for enhanced removal of estrogens and triclosan in water.
BMC Chem
December 2024
Department of Chemical Sciences, Faculty of Natural Sciences, Redeemer's University, PMB 230, Ede, Nigeria.
This Study focuses on the preparation of sustainable and efficient Chitosan catalyst for the removal of three organic pollutants, 17β-Estradiol (E2), 17α-ethynyl estradiol (EE2) and triclosan (TCS) from water. The prepared nanocomposites were characterized by different techniques which confirmed the presence of the key components Chitosan, Carica Papaya seed and Kaolinite. The optical characterization proved the nanocomposite is photoactive with a band gap of 1.
View Article and Find Full Text PDFEarly-Branching Cyanobacteria Grow Faster and Upregulate Superoxide Dismutase Activity Under a Simulated Early Earth Anoxic Atmosphere.
Geobiology
December 2024
Department of Microbiology, University of Kaiserslautern-Landau RPTU, Kaiserslautern, Germany.
The evolution of oxygenic photosynthesis during the Archean (4-2.5 Ga) required the presence of complementary reducing pathways to maintain the cellular redox balance. While the timing of the evolution of superoxide dismutases (SODs), enzymes that convert superoxide to hydrogen peroxide and O, within bacteria and archaea is not resolved, the first SODs appearing in cyanobacteria contained copper and zinc in the reaction center (CuZnSOD).
View Article and Find Full Text PDFSphingolipids modulate redox signalling during human sperm capacitation.
Hum Reprod
December 2024
Experimental Medicine Division, Department of Medicine, McGill University, Montréal, QC, Canada.
Study Question: What role do sphingolipids have in mediating human sperm capacitation?
Summary Answer: Sphingosine 1-phosphate (S1P) mediates the acquisition of fertilizing competency in human spermatozoa by engaging with its Gi-coupled receptor S1PR1 and promoting production of reactive oxygen species such as nitric oxide and superoxide anion.
What Is Known Already: Bioactive sphingolipids, such as S1P, are fundamental for regulating numerous physiological domains and processes, such as cell membranes and signalling, cell death and proliferation, cell migration and invasiveness, inflammation, and central nervous system development.
Study Design, Size, Duration: Semen samples were obtained from a cohort of 10 healthy non-smoking volunteers (18-30 years old) to investigate the role of S1P in sperm.
Verification of radical pair mechanism predictions for weak magnetic field effects on superoxide in planarians.
bioRxiv
November 2024
Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada.
Superoxide concentration and tissue regeneration in planarians exhibit a complex non-monotonic dependence on the strength of an applied weak magnetic field. While this is difficult to understand based on classical physics, a recently proposed quantum model based on a flavin-superoxide radical pair mechanism could replicate the previously observed superoxide concentrations. However, this model also predicts increased superoxide concentrations for both lower and higher fields.
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