Journal ArticleDOI
OTRPC4, a nonselective cation channel that confers sensitivity to extracellular osmolarity.
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TLDR
A new TRP (transient receptor potential)-like channel protein, OTRPC4, that is expressed at high levels in the kidney, liver and heart is identified and proposed as a candidate for a molecular sensor that confers osmosensitivity on mammalian cells.Abstract:
Ca2+-permeable channels that are involved in the responses of mammalian cells to changes in extracellular osmolarity have not been characterized at the molecular level. Here we identify a new TRP (transient receptor potential)-like channel protein, OTRPC4, that is expressed at high levels in the kidney, liver and heart. OTRPC4 forms Ca2+-permeable, nonselective cation channels that exhibit spontaneous activity in isotonic media and are rapidly activated by decreases in, and are inhibited by increases in, extracellular osmolarity. Changes in osmolarity of as little as 10% result in significant changes in intracellular Ca2+ concentration. We propose that OTRPC4 is a candidate for a molecular sensor that confers osmosensitivity on mammalian cells.read more
Citations
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Cellular and Molecular Mechanisms of Pain
TL;DR: Genetic, electrophysiological, and pharmacological studies are elucidating the molecular mechanisms that underlie detection, coding, and modulation of noxious stimuli that generate pain.
Journal ArticleDOI
TRP channels as cellular sensors
TL;DR: TRP channels are the vanguard of the authors' sensory systems, responding to temperature, touch, pain, osmolarity, pheromones, taste and other stimuli, but their role is much broader than classical sensory transduction.
Journal ArticleDOI
ANKTM1, a TRP-like Channel Expressed in Nociceptive Neurons, Is Activated by Cold Temperatures
Gina M. Story,Andrea M. Peier,Alison J. Reeve,Samer R. Eid,Johannes Mosbacher,Todd R. Hricik,Taryn J. Earley,Anne C. Hergarden,David Andersson,Sun Wook Hwang,Peter McIntyre,Timothy Jegla,Stuart Bevan,Ardem Patapoutian,Ardem Patapoutian +14 more
TL;DR: The characterization of ANKTM1 is described, a cold-activated channel with a lower activation temperature compared to the cold and menthol receptor, TRPM8, which is found in a subset of nociceptive sensory neurons where it is coexpressed with TRPV1/VR1 (the capsaicin/heat receptor) but not TRPM 8.
Journal ArticleDOI
A TRP Channel that Senses Cold Stimuli and Menthol
Andrea M. Peier,Aziz Moqrich,Anne C. Hergarden,Alison J. Reeve,David Andersson,Gina M. Story,Taryn J. Earley,Ilaria Dragoni,Peter McIntyre,Stuart Bevan,Ardem Patapoutian,Ardem Patapoutian +11 more
TL;DR: This work describes the cloning and characterization of TRPM8, a distant relative of VR1 that is specifically expressed in a subset of pain- and temperature-sensing neurons and implicates an expanded role for this family of ion channels in somatic sensory detection.
Journal ArticleDOI
Physiology of cell volume regulation in vertebrates.
TL;DR: Current knowledge regarding the molecular identity of these transport pathways and their regulation by, e.g., membrane deformation, ionic strength, Ca(2+), protein kinases and phosphatases, cytoskeletal elements, GTP binding proteins, lipid mediators, and reactive oxygen species are reviewed.
References
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Journal ArticleDOI
The capsaicin receptor: a heat-activated ion channel in the pain pathway
Michael J. Caterina,Mark Schumacher,Makoto Tominaga,Tobias A. Rosen,Jon D. Levine,David Julius +5 more
TL;DR: The cloned capsaicin receptor is also activated by increases in temperature in the noxious range, suggesting that it functions as a transducer of painful thermal stimuli in vivo.
Journal ArticleDOI
Thapsigargin, a tumor promoter, discharges intracellular Ca2+ stores by specific inhibition of the endoplasmic reticulum Ca2(+)-ATPase.
TL;DR: The results suggest that thapsigargin increases the concentration of cytosolic free Ca2+ in sensitive cells by an acute and highly specific arrest of the endoplasmic reticulum Ca 2+ pump, followed by a rapid Ca2+.
Journal ArticleDOI
The Cloned Capsaicin Receptor Integrates Multiple Pain-Producing Stimuli
Makoto Tominaga,Michael J. Caterina,Annika B. Malmberg,Tobias A. Rosen,Heather Gilbert,Kate Skinner,Brigitte E Raumann,Allan I. Basbaum,David Julius +8 more
TL;DR: It is shown that protons decrease the temperature threshold for VR1 activation such that even moderately acidic conditions (pH < or = 5.9) activate VR1 at room temperature, and VR1 can be viewed as a molecular integrator of chemical and physical stimuli that elicit pain.
Journal ArticleDOI
Functional Significance of Cell Volume Regulatory Mechanisms
Florian Lang,Gillian L. Busch,Markus Ritter,Harald Völkl,Siegfried Waldegger,Erich Gulbins,Dieter Häussinger +6 more
TL;DR: Cell volume may be considered a second message in the transmission of hormonal signals, and alterations of cell volume and volume regulatory mechanisms participate in a wide variety of cellular functions including epithelial transport, metabolism, excitation, hormone release, migration, cell proliferation, and cell death.
Journal ArticleDOI
Muscarinic activation of ionic currents measured by a new whole-cell recording method
Richard Horn,Alain Marty +1 more
TL;DR: Nystatin, applied extracellularly, is shown to cause a rapid and reversible increase of membrane conductance to cations, and dose-response curves for the effect of ACh on Ca-activated K currents are obtained.