A study was carried out of a mathematical model of ion transport through biological membranes along the channels capable of conformational transitions between two states (R, T) with different conductivities. The model describes changes in time of te membrane potential and surface concentration of channels in one of the states (R). It has been shown that there may exist extinguishing oscillations with the frequency close to f0 on such a system may induce the resonance changes of the membrane potential. The resonance frequency f0 increases with an increase of the amplitude of external influence, this induces hesteresis of the membrane resonance parameters.
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J Nanobiotechnology
January 2025
Department of Laboratory, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710032, China.
Background: Cardiac fibrosis plays a critical role in the progression of various forms of heart disease, significantly increasing the risk of sudden cardiac death. However, currently, there are no therapeutic strategies available to prevent the onset of cardiac fibrosis.
Methods And Results: Here, biomimetic ATP-responsive nanozymes based on genetically engineered cell membranes are adapted to specifically recognize activated cardiac fibroblasts (CFs) for the treatment of cardiac fibrosis.
Cell Commun Signal
January 2025
Institute of Animal Reproduction and Food Research, Olsztyn, Poland.
Cryopreservation of bull sperm, crucial for breeding and assisted reproduction, often reduces sperm quality due to oxidative stress. This study examines how oxidative stress during cryopreservation affects peroxiredoxin 5 (PRDX5) and peroxiredoxin 6 (PRDX6) proteins, leading to their translocation and oligomerization in bull sperm. Increased reactive oxygen species (ROS) and nitric oxide (NO) levels were linked to reduced mitochondrial potential, higher DNA fragmentation, and increased membrane fluidity, prompting PRDX5 to move intracellularly and PRDX6 to the cell membrane.
View Article and Find Full Text PDFJ Transl Med
January 2025
Department of Orthopedics, Affiliated Hospital of Nanjing University of Chinese Medicine / Jiangsu Province Hospital of Chinese Medicine, Nanjing, Jiangsu, 210029, China.
Background: Skeletal muscle injury caused by excessive exercise is one of the most commonly seen clinical diseases. It is indispensable to explore drugs for treating and relieving skeletal muscle injury. Gallic acid (GA) is a polyphenolic extract that has anti-inflammatory and antioxidant biological activities.
View Article and Find Full Text PDFNPJ Biofilms Microbiomes
January 2025
Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand.
Chronic infections represent a significant global health and economic challenge. Biofilms, which are bacterial communities encased in an extracellular polysaccharide matrix, contribute to approximately 80% of these infections. In particular, pathogens such as Pseudomonas aeruginosa and Staphylococcus aureus are frequently co-isolated from the sputum of patients with cystic fibrosis and are commonly found in chronic wound infections.
View Article and Find Full Text PDFNat Commun
January 2025
Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark.
Tetrahydrocannabinol (THC) is the principal psychoactive compound derived from the cannabis plant Cannabis sativa and approved for emetic conditions, appetite stimulation and sleep apnea relief. THC's psychoactive actions are mediated primarily by the cannabinoid receptor CB. Here, we determine the cryo-EM structure of HU210, a THC analog and widely used tool compound, bound to CB and its primary transducer, G.
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