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Telles CJ, Decker SE, Motley WW, Peters AW, Mehr AP, Frizzell RA, Forrest JN. Functional and molecular identification of a TASK-1 potassium channel regulating chloride secretion through CFTR channels in the shark rectal gland: implications for cystic fibrosis. Am J Physiol Cell Physiol 2016; 311:C884-C894. [PMID: 27653983 PMCID: PMC5206301 DOI: 10.1152/ajpcell.00030.2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 09/18/2016] [Indexed: 11/22/2022]
Abstract
In the shark rectal gland (SRG), apical chloride secretion through CFTR channels is electrically coupled to a basolateral K+ conductance whose type and molecular identity are unknown. We performed studies in the perfused SRG with 17 K+ channel inhibitors to begin this search. Maximal chloride secretion was markedly inhibited by low-perfusate pH, bupivicaine, anandamide, zinc, quinidine, and quinine, consistent with the properties of an acid-sensitive, four-transmembrane, two-pore-domain K+ channel (4TM-K2P). Using PCR with degenerate primers to this family, we identified a TASK-1 fragment in shark rectal gland, brain, gill, and kidney. Using 5' and 3' rapid amplification of cDNA ends PCR and genomic walking, we cloned the full-length shark gene (1,282 bp), whose open reading frame encodes a protein of 375 amino acids that was 80% identical to the human TASK-1 protein. We expressed shark and human TASK-1 cRNA in Xenopus oocytes and characterized these channels using two-electrode voltage clamping. Both channels had identical current-voltage relationships (outward rectifying) and a reversal potential of -90 mV. Both were inhibited by quinine, bupivicaine, and acidic pH. The pKa for current inhibition was 7.75 for shark TASK-1 vs. 7.37 for human TASK-1, values similar to the arterial pH for each species. We identified this protein in SRG by Western blot and confocal immunofluorescent microscopy and detected the protein in SRG and human airway cells. Shark TASK-1 is the major K+ channel coupled to chloride secretion in the SRG, is the oldest 4TM 2P family member identified, and is the first TASK-1 channel identified to play a role in setting the driving force for chloride secretion in epithelia. The detection of this potassium channel in mammalian lung tissue has implications for human biology and disease.
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Affiliation(s)
- Connor J Telles
- Nephrology Division, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
| | - Sarah E Decker
- Nephrology Division, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
| | - William W Motley
- Nephrology Division, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
| | - Alexander W Peters
- Nephrology Division, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
| | - Ali Poyan Mehr
- Nephrology Division, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
| | - Raymond A Frizzell
- Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; and
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
| | - John N Forrest
- Nephrology Division, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut;
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine
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Draz EI, Oreby MM, Elsheikh EA, Khedr LA, Atlam SA. Marijuana use in acute coronary syndromes. THE AMERICAN JOURNAL OF DRUG AND ALCOHOL ABUSE 2016; 43:576-582. [DOI: 10.1080/00952990.2016.1240800] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Eman I. Draz
- Department of Forensic Medicine & Clinical Toxicology, Faculty of Medicine, Tanta University, Egypt
| | - Mervat M. Oreby
- Department of Forensic Medicine & Clinical Toxicology, Faculty of Medicine, Tanta University, Egypt
| | - Eman A. Elsheikh
- Department of Cardiovascular Diseases, Faculty of Medicine, Tanta University, Egypt
| | - Lamia A. Khedr
- Department of Cardiovascular Diseases, Faculty of Medicine, Tanta University, Egypt
| | - Salwa A. Atlam
- Department of Public Health, Faculty of Medicine, Tanta University, Egypt
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Baik J, Ok SH, Kim EJ, Kang D, Hong JM, Shin IW, Lee HK, Chung YK, Cho Y, Lee SH, Kang S, Sohn JT. Mepivacaine attenuates vasodilation induced by ATP-sensitive potassium channels in rat aorta. Can J Physiol Pharmacol 2016; 94:1211-1219. [PMID: 27636507 DOI: 10.1139/cjpp-2016-0041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The goal of this in vitro study was to investigate the effect of mepivacaine on vasodilation induced by the ATP-sensitive potassium (KATP) channel opener levcromakalim in isolated endothelium-denuded rat aortas. The effects of mepivacaine and the KATP channel inhibitor glibenclamide, alone or in combination, on levcromakalim-induced vasodilation were assessed in the isolated aortas. The effects of mepivacaine or combined treatment with a protein kinase C (PKC) inhibitor, GF109203X, and mepivacaine on this vasodilation were also investigated. Levcromakalim concentration-response curves were generated for isolated aortas precontracted with phenylephrine or a PKC activator, phorbol 12,13-dibutyrate (PDBu). Further, the effects of mepivacaine and glibenclamide on levcromakalim-induced hyperpolarization were assessed in rat aortic vascular smooth muscle cells. Mepivacaine attenuated levcromakalim-induced vasodilation, whereas it had no effect on this vasodilation in isolated aortas pretreated with glibenclamide. Combined treatment with GF109203X and mepivacaine enhanced levcromakalim-induced vasodilation compared with pretreatment with mepivacaine alone. This vasodilation was attenuated in aortas precontracted with PDBu compared with those precontracted with phenylephrine. Mepivacaine and glibenclamide, alone or in combination, attenuated levcromakalim-induced membrane hyperpolarization. Taken together, these results suggest that mepivacaine attenuates vasodilation induced by KATP channels, which appears to be partly mediated by PKC.
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Affiliation(s)
- Jiseok Baik
- a Department of Anesthesia and Pain Medicine, School of Medicine, Pusan National University, Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan-si, 602-739, Republic of Korea
| | - Seong-Ho Ok
- b Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Eun-Jin Kim
- c Department of Physiology, Gyeongsang National University School of Medicine, Jinju-si, 52727, Republic of Korea
| | - Dawon Kang
- c Department of Physiology, Gyeongsang National University School of Medicine, Jinju-si, 52727, Republic of Korea
| | - Jeong-Min Hong
- a Department of Anesthesia and Pain Medicine, School of Medicine, Pusan National University, Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan-si, 602-739, Republic of Korea
| | - Il-Woo Shin
- b Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Heon Keun Lee
- b Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Young-Kyun Chung
- b Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Youngil Cho
- d Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Soo Hee Lee
- d Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Sebin Kang
- d Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea
| | - Ju-Tae Sohn
- b Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju-si, 52727, Republic of Korea.,e Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
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Abstract
This paper is the thirtieth consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2007 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior, and the roles of these opioid peptides and receptors in pain and analgesia; stress and social status; tolerance and dependence; learning and memory; eating and drinking; alcohol and drugs of abuse; sexual activity and hormones, pregnancy, development and endocrinology; mental illness and mood; seizures and neurologic disorders; electrical-related activity and neurophysiology; general activity and locomotion; gastrointestinal, renal and hepatic functions; cardiovascular responses; respiration and thermoregulation; and immunological responses.
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, 65-30 Kissena Blvd.,Flushing, NY 11367, United States.
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Raimundo JM, Pontes LB, Antunes F, Sudo RT, Trachez MM, Zapata-Sudo G. COMPARATIVE EFFECTS OF TRAMADOL ON VASCULAR REACTIVITY IN NORMOTENSIVE AND SPONTANEOUSLY HYPERTENSIVE RATS. Clin Exp Pharmacol Physiol 2008; 35:1197-203. [DOI: 10.1111/j.1440-1681.2008.04979.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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