ArticleThe Journal of physiology2001
Differential pH sensitivity of Kir4.1 and Kir4.2 potassium channels and their modulation by heteropolymerisation with Kir5.1.
Article in The Journal of physiology, 2001. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 78 papers.
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Who cites it
78 citing papers in PubMed, 131 citations in OpenAlex.
- Carbon Dioxide Euthanasia Selectively Affects Physiology of Murine Retinal Cells, Implicating Carbonic Anhydrase-Expressing Cell Populations.Investigative ophthalmology & visual science · 2026Article
- Cell Settling, Migration, and Stochastic Cancer Gene Expression Suggest Potassium Membrane Flux May Initiate pH Reversal.Biomolecules · 2025Article
- Article
- Parkinson's disease-linked Kir4.2 mutation R28C leads to loss of ion channel function.The Journal of physiology · 2025Article
- Review
- Kir5.1 regulates Kir4.2 expression and is a key component of the 50-pS inwardly rectifying potassium channel in basolateral membrane of mouse proximal tubules.American journal of physiology. Renal physiology · 2025Article
- The physiological characteristics of inward rectifying potassium channel Kir4.2 and its research progress in human diseases.Frontiers in cell and developmental biology · 2025Review
- Role of KThe American journal of pathology · 2025Article
- Role of calcineurin in regulating renal potassium (KActa physiologica (Oxford, England) · 2024Review
- Advancing Kir4.2 Channel Ligand Identification through Collision-Induced Affinity Selection Mass Spectrometry.ACS chemical biology · 2024Article
- Role of Angiotensin II Type 1a Receptor (AT1aR) of Renal Tubules in Regulating Inwardly Rectifying Potassium Channels 4.2 (Kir4.2), Kir4.1, and Epithelial NaHypertension (Dallas, Tex. : 1979) · 2024Article
- Criteria for central respiratory chemoreceptors: experimental evidence supporting current candidate cell groups.Frontiers in physiology · 2023Review
- Diverse functions of the inward-rectifying potassium channel Kir5.1 and its relationship with human diseases.Frontiers in physiology · 2023Review
- Inwardly rectifying KAmerican journal of physiology. Cell physiology · 2022Review
- VU6036720: The First Potent and Selective In Vitro Inhibitor of Heteromeric Kir4.1/5.1 Inward Rectifier Potassium Channels.Molecular pharmacology · 2022Article
- Putative Roles of Astrocytes in General Anesthesia.Current neuropharmacology · 2022Review
- EAST/SeSAME Syndrome and Beyond: The Spectrum of Kir4.1- and Kir5.1-Associated Channelopathies.Frontiers in physiology · 2022Review
- The effect of high-dietary KFrontiers in physiology · 2022Article
- Deletion of renal Nedd4-2 abolishes the effect of high KAmerican journal of physiology. Renal physiology · 2021Article
- Article
18 more citing papers are in PubMed but not listed here.
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Authors and funding
5 authors at 3 institutions in 2 countries.
Funding
Abstract
1. The inwardly rectifying potassium channel Kir5.1 appears to form functional channels only by coexpression with either Kir4.1 or Kir4.2. Kir4.1-Kir5.1 heteromeric channels have been shown to exist in vivo in renal tubular epithelia. However, Kir5.1 is expressed in many other tissues where Kir4.1 is not found. Using Kir5.1-specific antibodies we have localised Kir5.1 expression in the pancreas, a tissue where Kir4.2 is also highly expressed. 2. Heteromeric Kir5.1-Kir4.1 channels are significantly more sensitive to intracellular acidification than Kir4.1 currents. We demonstrate that this increased sensitivity is primarily due to modulation of the intrinsic Kir4.1 pH sensitivity by Kir5.1. 3. Kir4.2 was found to be significantly more pH sensitive (pK(a) = 7.1) than Kir4.1 (pK(a) = 5.99) due to an additional pH-sensing mechanism involving the C-terminus. As a result, coexpression with Kir5.1 does not cause a major shift in the pH sensitivity of the heteromeric Kir4.2-Kir5.1 channel. 4. Cell-attached single channel analysis of Kir4.2 revealed a channel with a high open probability (P(o) > 0.9) and single channel conductance of approximately 25 pS, whilst coexpression with Kir5.1 produced novel bursting channels (P(o) < 0.3) and a principal conductance of approximately 54 pS with several subconductance states. 5. These results indicate that Kir5.1 may form heteromeric channels with Kir4.2 in tissues where Kir4.1 is not expressed (e.g. pancreas) and that these novel channels are likely to be regulated by changes in intracellular pH. In addition, the extreme pH sensitivity of Kir4.2 has implications for the role of this subunit as a homotetrameric channel.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.