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Deen PMT, Boone M, Schweer H, Olesen ETB, Carmone C, Wetzels JFM, Fenton RA, Kortenoeven MLA. A Vasopressin-Induced Change in Prostaglandin Receptor Subtype Expression Explains the Differential Effect of PGE2 on AQP2 Expression. Front Physiol 2022; 12:787598. [PMID: 35126177 PMCID: PMC8814457 DOI: 10.3389/fphys.2021.787598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/07/2021] [Indexed: 11/20/2022] Open
Abstract
Arginine vasopressin (AVP) stimulates the concentration of renal urine by increasing the principal cell expression of aquaporin-2 (AQP2) water channels. Prostaglandin E2 (PGE2) and prostaglandin2α (PGF2α) increase the water absorption of the principal cell without AVP, but PGE2 decreases it in the presence of AVP. The underlying mechanism of this paradoxical response was investigated here. Mouse cortical collecting duct (mkpCCDc14) cells mimic principal cells as they endogenously express AQP2 in response to AVP. PGE2 increased AQP2 abundance without desmopressin (dDAVP), while in the presence of dDAVP, PGE2, and PGF2α reduced AQP2 abundance. dDAVP increased the cellular PGD2 and PGE2 release and decreased the PGF2α release. MpkCCD cells expressed mRNAs for the receptors of PGE2 (EP1/EP4), PGF2 (FP), and TxB2 (TP). Incubation with dDAVP increased the expression of EP1 and FP but decreased the expression of EP4. In the absence of dDAVP, incubation of mpkCCD cells with an EP4, but not EP1/3, agonist increased AQP2 abundance, and the PGE2-induced increase in AQP2 was blocked with an EP4 antagonist. Moreover, in the presence of dDAVP, an EP1/3, but not EP4, agonist decreased the AQP2 abundance, and the addition of EP1 antagonists prevented the PGE2-mediated downregulation of AQP2. Our study shows that in mpkCCDc14 cells, reduced EP4 receptor and increased EP1/FP receptor expression by dDAVP explains the differential effects of PGE2 and PGF2α on AQP2 abundance with or without dDAVP. As the V2R and EP4 receptor, but not the EP1 and FP receptor, can couple to Gs and stimulate the cyclic adenosine monophosphate (cAMP) pathway, our data support a view that cells can desensitize themselves for receptors activating the same pathway and sensitize themselves for receptors of alternative pathways.
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Affiliation(s)
- Peter M. T. Deen
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | - Michelle Boone
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | - Horst Schweer
- Department of Pediatrics, Philipps-University Marburg, Marburg, Germany
| | - Emma T. B. Olesen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Endocrinology and Nephrology, North Zealand Hospital, Hillerød, Denmark
| | - Claudia Carmone
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | - Jack F. M. Wetzels
- Department of Nephrology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | | | - Marleen L. A. Kortenoeven
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
- *Correspondence: Marleen L. A. Kortenoeven
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Bouley R, Nunes P, Andriopoulos B, McLaughlin M, Webber MJ, Lin HY, Babitt JL, Gardella TJ, Ausiello DA, Brown D. Heterologous downregulation of vasopressin type 2 receptor is induced by transferrin. Am J Physiol Renal Physiol 2012; 304:F553-64. [PMID: 23235478 DOI: 10.1152/ajprenal.00438.2011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Vasopressin (VP) binds to the vasopressin type 2 receptor (V2R) to trigger physiological effects including body fluid homeostasis and blood pressure regulation. Signaling is terminated by receptor downregulation involving clathrin-mediated endocytosis and V2R degradation. We report here that both native and epitope-tagged V2R are internalized from the plasma membrane of LLC-PK1 kidney epithelial cells in the presence of another ligand, transferrin (Tf). The presence of iron-saturated Tf (holo-Tf; 4 h) reduced V2R binding sites at the cell surface by up to 33% while iron-free (apo-Tf) had no effect. However, no change in green fluorescent protein-tagged V2R distribution was observed in the presence of bovine serum albumin, atrial natriuretic peptide, or ANG II. Conversely, holo-Tf did not induce the internalization of another G protein-coupled receptor, the parathyroid hormone receptor. In contrast to the effect of VP, Tf did not increase intracellular cAMP or modify aquaporin-2 distribution in these cells, although addition of VP and Tf together augmented VP-induced V2R internalization. Tf receptor coimmunoprecipitated with V2R, suggesting that they interact closely, which may explain the additive effect of VP and Tf on V2R endocytosis. Furthermore, Tf-induced V2R internalization was abolished in cells expressing a dominant negative dynamin (K44A) mutant, indicating the involvement of clathrin-coated pits. We conclude that Tf can induce heterologous downregulation of the V2R and this might desensitize VP target cells without activating downstream V2R signaling events. It also provides new insights into urine-concentrating defects observed in rat models of hemochromatosis.
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Affiliation(s)
- Richard Bouley
- 1Nephrology Division, MGH Center for Systems Biology, Program in Membrane Biology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.
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Kohan DE, Rossi NF, Inscho EW, Pollock DM. Regulation of blood pressure and salt homeostasis by endothelin. Physiol Rev 2011; 91:1-77. [PMID: 21248162 DOI: 10.1152/physrev.00060.2009] [Citation(s) in RCA: 276] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Endothelin (ET) peptides and their receptors are intimately involved in the physiological control of systemic blood pressure and body Na homeostasis, exerting these effects through alterations in a host of circulating and local factors. Hormonal systems affected by ET include natriuretic peptides, aldosterone, catecholamines, and angiotensin. ET also directly regulates cardiac output, central and peripheral nervous system activity, renal Na and water excretion, systemic vascular resistance, and venous capacitance. ET regulation of these systems is often complex, sometimes involving opposing actions depending on which receptor isoform is activated, which cells are affected, and what other prevailing factors exist. A detailed understanding of this system is important; disordered regulation of the ET system is strongly associated with hypertension and dysregulated extracellular fluid volume homeostasis. In addition, ET receptor antagonists are being increasingly used for the treatment of a variety of diseases; while demonstrating benefit, these agents also have adverse effects on fluid retention that may substantially limit their clinical utility. This review provides a detailed analysis of how the ET system is involved in the control of blood pressure and Na homeostasis, focusing primarily on physiological regulation with some discussion of the role of the ET system in hypertension.
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Affiliation(s)
- Donald E Kohan
- Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah 84132, USA.
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Wang MH, Fok A, Huang MH, Wong NLM. Interaction between endothelin and angiotensin II in the up-regulation of vasopressin messenger RNA in the inner medullary collecting duct of the rat. Metabolism 2007; 56:1372-6. [PMID: 17884447 DOI: 10.1016/j.metabol.2007.05.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2006] [Accepted: 05/15/2007] [Indexed: 11/29/2022]
Abstract
Recent studies in our laboratory have demonstrated that angiotensin (ANG) II and endothelin (ET) 1 up-regulate the expression of arginine vasopressin V(2) receptor in the inner medullary collecting duct (IMCD) of the rat. The present studies were performed to explore the interaction between ANG II and ET-1 in up-regulating the expression of arginine vasopressin V(2) receptor in the IMCD of the rat. Two sets of studies were done. In the first set of studies, rat IMCD tissue was isolated and incubated with ANG II in combination with ET(A) or ET(B) antagonist. In the second set of experiments, rat IMCD tissue was incubated with ET-1 with ANG receptor antagonist saralasin. Tissue samples were then analyzed by means of quantitative reverse transcriptase polymerase chain reaction and Western blotting. The ANG II treatment resulted in increased V(2) messenger RNA (mRNA) from control level of 138 +/- 12 amol/microg of total RNA to 385 +/- 63 amol/microg of total RNA (P < .01). The ANG II/ET(A) treatment resulted in no significant decrease in V(2) mRNA expression (319 +/- 59 amol/microg of total RNA), whereas ET-1/ET(B) antagonist and ET-1/ET(A)/ET(B) antagonist treatments resulted in reducing V(2) mRNA to control levels of 214 +/- 25 and 176 +/- 22 amol/microg of total RNA, respectively. The ET-1 treatment increased V(2) mRNA expression from control level of 221 +/- 25 amol/microg of total RNA to 383 +/- 43 amol/microg of total RNA (P < .02). The ET-1-induced increase in V(2) mRNA expression was significantly reduced to control level (210 +/- 36 amol/microg of total RNA) after saralasin treatment. Western blotting revealed that changes in protein expression in the different treatment conditions were comparable with changes in V(2) mRNA expression. These data suggested that the up-regulation of V(2) receptor induced by ANG II and ET-1 is mediated by both vasoconstricting hormones. These 2 systems interact in up-regulating the expression of V(2) receptors in the kidney.
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Affiliation(s)
- Min Hui Wang
- Department of Medicine, University of British Columbia, Vancouver Hospital and Health Sciences Center, Vancouver, British Columbia, Canada
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Lo ACY, Chen AYS, Hung VKL, Yaw LP, Fung MKL, Ho MCY, Tsang MCS, Chung SSM, Chung SK. Endothelin-1 overexpression leads to further water accumulation and brain edema after middle cerebral artery occlusion via aquaporin 4 expression in astrocytic end-feet. J Cereb Blood Flow Metab 2005; 25:998-1011. [PMID: 15815585 DOI: 10.1038/sj.jcbfm.9600108] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Stroke patients have increased levels of endothelin-1 (ET-1), a strong vasoconstrictor, in their plasma or cerebrospinal fluid. Previously, we showed high level of ET-1 mRNA expression in astrocytes after hypoxia/ischemia. It is unclear whether the contribution of ET-1 induction in astrocytes is protective or destructive in cerebral ischemia. Here, we generated a transgenic mouse model that overexpress ET-1 in astrocytes (GET-1) using the glial fibrillary acidic protein promoter to examine the role of astrocytic ET-1 in ischemic stroke by challenging these mice with transient middle cerebral artery occlusion (MCAO). Under normal condition, GET-1 mice showed no abnormality in brain morphology, cerebrovasculature, absolute cerebral blood flow, blood-brain barrier (BBB) integrity, and mean arterial blood pressure. Yet, GET-1 mice subjected to transient MCAO showed more severe neurologic deficits and increased infarct, which were partially normalized by administration of ABT-627 (ET(A) antagonist) 5 mins after MCAO. In addition, GET-1 brains exhibited more Evans blue extravasation and showed decreased endothelial occludin expression after MCAO, correlating with higher brain water content and increased cerebral edema. Aquaporin 4 expression was also more pronounced in astrocytic end-feet on blood vessels in GET-1 ipsilateral brains. Our current data suggest that astrocytic ET-1 has deleterious effects on water homeostasis, cerebral edema and BBB integrity, which contribute to more severe ischemic brain injury.
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Affiliation(s)
- Amy C Y Lo
- Institute of Molecular Biology, The University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
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