AI Article Synopsis
- The study used NMR spectroscopy to analyze intracellular ions such as sodium, potassium, and lithium in a perfused frog heart.
- The experiment involved altering the perfusion conditions with ouabain, zero potassium, low calcium, and lithium, resulting in significant changes to intracellular sodium levels.
- NMR measurements revealed a potassium-to-sodium ratio of 2.3, suggesting a large portion of intracellular potassium isn't detected by the NMR techniques, while lithium presence was confirmed during lithium perfusion.
Article Abstract
Intracellular sodium, potassium, and lithium were observed in a perfused frog heart by nuclear magnetic resonance (NMR) spectroscopy. A perfusate buffer containing the shift reagent, dysprosium tripolyphosphate, was used in combination with mathematical filtering or presaturation of the extracellular resonance to separate the intra- and extracellular sodium NMR signals. Addition of 10 microM ouabain to the perfusate, perfusion with a zero potassium, low-calcium buffer, and replacement of 66% of the perfusate sodium with lithium resulted in the following percent changes in the intracellular sodium levels (mean +/- SD): ouabain + 460 +/- 60% (n = 6), zero potassium + 300 +/- 30% (n = 3), and lithium - 51 +/- 6% (n = 3). An increase of 45% in the intracellular sodium was observed when changing the pacing rate from 0 to 60 beats/min (with proportional changes for intermediate pacing rates). The ratio of intracellular potassium to sodium concentration was determined to be 2.3 by NMR, indicating that a substantial amount of the intracellular potassium is undetectable with these NMR methods. In addition, intracellular lithium was observed during perfusion with a lithium-containing perfusate.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1152/ajpheart.1987.252.6.H1138 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unraveling the phenotypic and metabolic responses induced by urea-encapsulated hydrogel beads on (L.) Czern & Coss.
Mol Omics
January 2025
Department of Biology, National Changhua University of Education, Changhua 500, Taiwan.
Hydrogels, three-dimensional polymeric networks capable of absorbing and retaining significant amounts of aqueous solution, offer a promising platform for controlled release of desired compounds. In this study, we explored the effects of urea delivery through galactoxyloglucan-sodium alginate hydrogels on the phenotypic and metabolic responses of , a vital oilseed and vegetable crop. The experiments were conducted with four treatments: control (without hydrogel beads and urea), direct urea supplementation (U), hydrogel beads with urea (HBWU), and hydrogel beads without urea (HBWOU).
View Article and Find Full Text PDFSagittaria sagittifolia polysaccharide extract regulates Nrf2 to improve endoplasmic reticulum stress-mediated apoptosis in rat cataracts and HLEB3 cells.
Int J Biol Macromol
January 2025
School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102446, China. Electronic address:
Age-related cataract (ARC) remains the leading cause of blindness worldwide. Sagittaria sagittifolia polysaccharide (SSP) extract, a key component of Sagittaria sagittifolia L., exhibits anti-oxidant and anti-apoptotic effects with potential applications in ARC.
View Article and Find Full Text PDFSigma-1 Receptor Modulates CFA-Induced Inflammatory Pain via Sodium Channels in Small DRG Neurons.
Biomolecules
January 2025
Department of Physiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Rd., Wuhan 430030, China.
The sigma-1 receptor (Sig-1R) has emerged as a significant target in the realm of pain management and has been the subject of extensive research. Nonetheless, its specific function in inflammatory pain within dorsal root ganglion (DRG) neurons remains inadequately elucidated. This study utilized whole-cell patch clamp techniques, single-cell real-time PCR, and immunohistochemistry to examine the influence of Sig-1R on inflammatory pain induced by complete Freund's adjuvant (CFA) in a rat model.
View Article and Find Full Text PDFDetection of Deaths Caused by Hyperkalemia.
Biomedicines
January 2025
Department of Histology and Embryology, Faculty of Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 85-092 Bydgoszcz, Poland.
Under normal conditions, potassium is predominantly found within cells. The concentration gradient of sodium and potassium ions between intracellular and extracellular spaces enables signal transmission through membrane depolarization. The disruption of this transcellular process leads to elevated potassium ion levels in the extracellular space, and thus in the blood, a condition known as hyperkalemia.
View Article and Find Full Text PDFLysosomes finely control macrophage inflammatory function via regulating the release of lysosomal Fe through TRPML1 channel.
Nat Commun
January 2025
Jiangsu Province Key Laboratory of Anesthesiology, Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou Medical University, Xuzhou, Jiangsu, China.
Lysosomes are best known for their roles in inflammatory responses by engaging in autophagy to remove inflammasomes. Here, we describe an unrecognized role for the lysosome, showing that it finely controls macrophage inflammatory function by manipulating the lysosomal Fe-prolyl hydroxylase domain enzymes (PHDs)-NF-κB-interleukin 1 beta (IL1B) transcription pathway that directly links lysosomes with inflammatory responses. TRPML1, a lysosomal cationic channel, is activated secondarily to ROS elevation upon inflammatory stimuli, which in turn suppresses IL1B transcription, thus limiting the excessive production of IL-1β in macrophages.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!