The gene mutated in cystic fibrosis codes for the cystic fibrosis transmembrane conductance regulator (CFTR). Previously, we provided definitive evidence that CFTR functions as a phosphorylation-regulated chloride channel in our planar lipid bilayer studies of the purified, reconstituted protein. Recent patch-clamp studies have lead to the suggestion that CFTR may also be capable of conducting ATP or inducing this function in neighboring channels. In the present study, we assessed the ATP channel activity of purified CFTR and found that the purified protein does not function as an ATP channel in planar bilayer studies of single channel activity nor in ATP flux measurements in proteoliposomes. Hence, CFTR does not possess intrinsic ATP channel activity and its putative role in cellular ATP transport may be indirect.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1074/jbc.271.20.11623 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Novel multipotent conjugate bearing tacrine and donepezil motifs with dual cholinergic inhibition and neuroprotective properties targeting Alzheimer's disease.
RSC Med Chem
January 2025
Área de Neurofisiología celular, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia Medellín Colombia
In this work, we developed potential multifunctional agents to combat Alzheimer's disease. According to our strategy, fragments of tacrine and donepezil were merged in a unique hybrid structure. After successfully synthesizing the compounds, they were evaluated for their dual AChE/BuChE inhibitor potential and neuroprotector response using a glutamate-induced excitotoxicity model.
View Article and Find Full Text PDFTwo-pore channel regulators - Who is in control?
Front Physiol
January 2025
Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig-Maximilians-University, Munich, Germany.
Two-pore channels (TPCs) are adenine nucleotide and phosphoinositide regulated cation channels. NAADP activates and ATP blocks TPCs, while the endolysosomal phosphoinositide PI(3,5)P activates TPCs. TPCs are ubiquitously expressed including expression in the innate as well as the adaptive immune system.
View Article and Find Full Text PDFMCU-i4, a mitochondrial Ca uniporter modulator, induces breast cancer BT474 cell death by enhancing glycolysis, ATP production and reactive oxygen species (ROS) burst.
Oncol Res
January 2025
Department of Physiology, China Medical University, Taichung, 404328, Taiwan.
Objectives: Mitochondrial Ca uniporter (MCU) provides a Ca influx pathway from the cytosol into the mitochondrial matrix and a moderate mitochondrial Ca rise stimulates ATP production and cell growth. MCU is highly expressed in various cancer cells including breast cancer cells, thereby increasing the capacity of mitochondrial Ca uptake, ATP production, and cancer cell proliferation. The objective of this study was to examine MCU inhibition as an anti-cancer mechanism.
View Article and Find Full Text PDFA New target of ischemic ventricular arrhythmias-ITFG2.
Eur J Pharmacol
January 2025
Department of Basic Medicine, Institute of Respiratory Diseases Xiamen Medical College, Xiamen Medical College, Xiamen, Fujian 361023, P. R. China; State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Harbin Medical University, Harbin, Heilongjiang 150081, P. R. China. Electronic address:
ITFG2 is an intracellular protein known to modulate the immune response of T-cells. Our previous investigation revealed that ITFG2 specifically targets ATP5b to regulate ATP energy metabolism and maintain mitochondrial function, thereby protecting the heart from ischemic injury. However, the role of ITFG2 in ischemic ventricular arrhythmias and its underlying mechanisms have not been previously reported.
View Article and Find Full Text PDFThe Arabidopsis eATP receptor, DORN1 and CNGC19 channel act in tandem to regulate plant defense upon Spodoptera litura herbivory.
J Exp Bot
January 2025
National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi 110067, India.
Plants deploy cellular Ca2+ elevation as a signal for environmental stress signaling. Extracellular ATP (eATP) is released into the extracellular matrix when cells are wounded. DOES NOT RESPOND TO NUCLEOTIDES 1 (DORN1), a key legume-type lectin receptor, senses and binds eATP and activates Ca2+ signaling.
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!