This proposal concerns the regulation of ion-channel function by G-protein-coupled receptor (GPCR) signaling to membrane lipids. It focuses on the hypothesis that the function of many ion channels depends on the concentration of one rare phospholipid, phosphatidylinositol 4,5-bisphosphate (PIP2) in the plasma membrane. The kinetics of signaling steps from M1 muscarinic receptors to phospholipase C will be measured to test the hypothesis that they are fast, perhaps reflecting a preformed signaling complex. The kinetics of the metabolic steps that deplete and replenish PIP2 will be measured to understand the cellular sources and dynamics of PIP2. All results will be fitted with a comprehensive kinetic model to provide additional information on the mechanisms of the signaling cascade. The ability of PIP2 concentration changes and muscarinic signaling to modulate function of KCNQ channels, several voltage-gated K+ channels (Kv channels), and voltage-gated Ca2+ channels (Cav channels) will be studied. The ability of arachidonic acid to modulate KCNQ and Cav channels will be analyzed. Physiological mechanisms for arachidonic acid production initiated by GPCR inputs will be defined. The methods will include patch-clamp electrophysiology, fluorescence resonance energy transfer, dynamic targeting of enzymes to cellular membranes, confocal microscopy, and chemical analysis. Most of the studies will be done on cell lines but a small number will be done in nerve cells of rodents to demonstrate the relevance to mammalian physiology. This work lays the basis for understanding hormonal control of mental state and the actions of many drugs of biological psychiatry. Many drugs of abuse and drugs of psychiatry act on the signaling systems studied here. The involuntary nervous system talks to its targets by the signaling mechanisms elucidated here.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS008174-44
Application #
8269897
Study Section
Neurotransporters, Receptors, and Calcium Signaling Study Section (NTRC)
Program Officer
Stewart, Randall R
Project Start
1974-10-01
Project End
2013-09-29
Budget Start
2012-06-01
Budget End
2013-09-29
Support Year
44
Fiscal Year
2012
Total Cost
$334,425
Indirect Cost
$120,050
Name
University of Washington
Department
Physiology
Type
Schools of Medicine
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195
Hille, Bertil; Dickson, Eamonn J; Kruse, Martin et al. (2015) Phosphoinositides regulate ion channels. Biochim Biophys Acta 1851:844-56
Yu, Haijie; Seo, Jong Bae; Jung, Seung-Ryoung et al. (2015) Noradrenaline upregulates T-type calcium channels in rat pinealocytes. J Physiol 593:887-904
Yoon, Jin-Young; Jung, Seung-Ryoung; Hille, Bertil et al. (2014) Modulation of nicotinic receptor channels by adrenergic stimulation in rat pinealocytes. Am J Physiol Cell Physiol 306:C726-35
Hille, Bertil; Dickson, Eamonn; Kruse, Martin et al. (2014) Dynamic metabolic control of an ion channel. Prog Mol Biol Transl Sci 123:219-47
Dickson, Eamonn J; Falkenburger, Björn H; Hille, Bertil (2013) Quantitative properties and receptor reserve of the IP(3) and calcium branch of G(q)-coupled receptor signaling. J Gen Physiol 141:521-35
Falkenburger, Björn H; Dickson, Eamonn J; Hille, Bertil (2013) Quantitative properties and receptor reserve of the DAG and PKC branch of G(q)-coupled receptor signaling. J Gen Physiol 141:537-55
Kim, Mean-Hwan; Seo, Jong Bae; Burnett, Lindsey A et al. (2013) Characterization of store-operated Ca2+ channels in pancreatic duct epithelia. Cell Calcium 54:266-75
Kruse, Martin; Hille, Bertil (2013) The phosphoinositide sensitivity of the K(v) channel family. Channels (Austin) 7:530-6
Dickson, Eamonn J; Duman, Joseph G; Moody, Mark W et al. (2012) Orai-STIM-mediated Ca2+ release from secretory granules revealed by a targeted Ca2+ and pH probe. Proc Natl Acad Sci U S A 109:E3539-48
Kruse, Martin; Hammond, Gerald R V; Hille, Bertil (2012) Regulation of voltage-gated potassium channels by PI(4,5)P2. J Gen Physiol 140:189-205

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