LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 11

Search options

  1. Book ; Online ; Thesis: Bedeutung der Interaktion von Calcineurin und SORLA für die Regulation des Na+, K+, 2CI--Kotransporters (NKCC2) in der Niere

    Borschewski, Aljona / Bachmann, Sebastian / Gräf, Ralph

    2016  

    Abstract: Der Na⁺-K⁺-2Cl⁻-Kotransporter (NKCC2) wird im distalen Nephron der Niere exprimiert. Seine Verteilung umfasst die Epithelien der medullären und kortikalen Teile der dicken aufsteigenden Henle-Schleife (Thick ascending limb, TAL) und die Macula densa. ... ...

    Title variant Importance of the interaction between calcineurin and SORLA for the regulation of the renal Na+-K+-2CI--cotransporter (NKCC2)
    Author's details vorgelegt von Aljona Borschewski
    Abstract Der Na⁺-K⁺-2Cl⁻-Kotransporter (NKCC2) wird im distalen Nephron der Niere exprimiert. Seine Verteilung umfasst die Epithelien der medullären und kortikalen Teile der dicken aufsteigenden Henle-Schleife (Thick ascending limb, TAL) und die Macula densa. Resorptiver NaCl-Transport über den NKCC2 dient dem renalen Konzentrierungsmechanismus und reguliert systemisch auch Volumenstatus und Blutdruck. Die Aktivität des NKCC2 ist mit der Phosphorylierung seiner N-terminalen Aminosäurereste Serin 126 und Threonin 96/101 verbunden. Vermittelt wird diese durch die homologen Kinasen SPAK (SPS-related proline/alanine-rich kinase) und OSR1 (Oxidative stress responsive kinase 1), die hierzu ihrerseits phosphoryliert werden müssen. Der regulatorische Kontext dieser Kinasen ist mittlerweile gut charakterisiert. Über Mechanismen und Produkte, die den NKCC2 deaktivieren, war hingegen weniger bekannt. Ziel der Arbeit war daher zu untersuchen, welche Wege zur Deaktivierung des Transporters führen. Der intrazelluläre Sortierungsrezeptor SORLA (Sorting-prote…
    Language German
    Size 1 Online-Ressource (II, 86 Blätter), Illustrationen, Diagramme
    Publishing place Potsdam
    Publishing country Germany
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Dissertation, Universität Potsdam, Mathematisch-Naturwissenschaftliche Fakultät, 2016
    HBZ-ID HT019856231
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

    Kategorien

  2. Article ; Online: Caveolin 1 Promotes Renal Water and Salt Reabsorption.

    Willière, Yan / Borschewski, Aljona / Patzak, Andreas / Nikitina, Tatiana / Dittmayer, Carsten / Daigeler, Anna L / Schuelke, Markus / Bachmann, Sebastian / Mutig, Kerim

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 545

    Abstract: Caveolin-1 (Cav1) is essential for the formation of caveolae. Little is known about their functional role in the kidney. We tested the hypothesis that caveolae modulate renal salt and water reabsorption. Wild-type (WT) and Cav1-deficient (Cav1-/-) mice ... ...

    Abstract Caveolin-1 (Cav1) is essential for the formation of caveolae. Little is known about their functional role in the kidney. We tested the hypothesis that caveolae modulate renal salt and water reabsorption. Wild-type (WT) and Cav1-deficient (Cav1-/-) mice were studied. Cav1 expression and caveolae formation were present in vascular cells, late distal convoluted tubule and principal connecting tubule and collecting duct cells of WT but not Cav1-/- kidneys. Urinary sodium excretion was increased by 94% and urine flow by 126% in Cav1-/- mice (p < 0.05). A decrease in activating phosphorylation of the Na-Cl cotransporter (NCC) of the distal convoluted tubule was recorded in Cav1-/- compared to WT kidneys (-40%; p < 0.05). Isolated intrarenal arteries from Cav1-/- mice revealed a fourfold reduction in sensitivity to phenylephrine (p < 0.05). A significantly diminished maximal contractile response (-13%; p < 0.05) was suggestive of enhanced nitric oxide (NO) availability. In line with this, the abundance of endothelial NO synthase (eNOS) was increased in Cav1-/- kidneys +213%; p < 0.05) and cultured caveolae-deprived cells showed intracellular accumulation of eNOS, compared to caveolae-intact controls. Our results suggest that renal caveolae help to conserve water and electrolytes via modulation of NCC function and regulation of vascular eNOS.
    MeSH term(s) Animals ; Caveolin 1/genetics ; Caveolin 1/metabolism ; Cells, Cultured ; Endothelium, Vascular/metabolism ; Endothelium, Vascular/physiology ; Humans ; Kidney/blood supply ; Kidney/metabolism ; Male ; Mice ; Mice, Inbred C57BL ; Nitric Oxide/metabolism ; Nitric Oxide Synthase Type III/metabolism ; Renal Artery/metabolism ; Renal Artery/physiology ; Renal Reabsorption ; Sodium/metabolism ; Sodium-Calcium Exchanger/metabolism
    Chemical Substances Cav1 protein, mouse ; Caveolin 1 ; Sodium-Calcium Exchanger ; Nitric Oxide (31C4KY9ESH) ; Sodium (9NEZ333N27) ; Nitric Oxide Synthase Type III (EC 1.14.13.39)
    Language English
    Publishing date 2018-01-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-19071-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Book ; Online ; Thesis: Bedeutung der Interaktion von Calcineurin und SORLA für die Regulation des Na⁺,K⁺,2Cl⁻-Kotransporters (NKCC2) in der Niere

    Borschewski, Aljona [Verfasser] / Bachmann, Sebastian [Akademischer Betreuer] / Gräf, Ralph [Akademischer Betreuer]

    2015  

    Author's details Aljona Borschewski ; Sebastian Bachmann, Ralph Gräf
    Keywords Biowissenschaften, Biologie ; Life Science, Biology
    Subject code sg570
    Language German
    Publisher Universität Potsdam
    Publishing place Potsdam
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

    More links

    Kategorien

  4. Article ; Online: Caveolin 1 Promotes Renal Water and Salt Reabsorption

    Yan Willière / Aljona Borschewski / Andreas Patzak / Tatiana Nikitina / Carsten Dittmayer / Anna L. Daigeler / Markus Schuelke / Sebastian Bachmann / Kerim Mutig

    Scientific Reports, Vol 8, Iss 1, Pp 1-

    2018  Volume 14

    Abstract: Abstract Caveolin-1 (Cav1) is essential for the formation of caveolae. Little is known about their functional role in the kidney. We tested the hypothesis that caveolae modulate renal salt and water reabsorption. Wild-type (WT) and Cav1-deficient (Cav1−/− ...

    Abstract Abstract Caveolin-1 (Cav1) is essential for the formation of caveolae. Little is known about their functional role in the kidney. We tested the hypothesis that caveolae modulate renal salt and water reabsorption. Wild-type (WT) and Cav1-deficient (Cav1−/−) mice were studied. Cav1 expression and caveolae formation were present in vascular cells, late distal convoluted tubule and principal connecting tubule and collecting duct cells of WT but not Cav1−/− kidneys. Urinary sodium excretion was increased by 94% and urine flow by 126% in Cav1−/− mice (p < 0.05). A decrease in activating phosphorylation of the Na-Cl cotransporter (NCC) of the distal convoluted tubule was recorded in Cav1−/− compared to WT kidneys (−40%; p < 0.05). Isolated intrarenal arteries from Cav1−/− mice revealed a fourfold reduction in sensitivity to phenylephrine (p < 0.05). A significantly diminished maximal contractile response (−13%; p < 0.05) was suggestive of enhanced nitric oxide (NO) availability. In line with this, the abundance of endothelial NO synthase (eNOS) was increased in Cav1−/− kidneys +213%; p < 0.05) and cultured caveolae-deprived cells showed intracellular accumulation of eNOS, compared to caveolae-intact controls. Our results suggest that renal caveolae help to conserve water and electrolytes via modulation of NCC function and regulation of vascular eNOS.
    Keywords Medicine ; R ; Science ; Q
    Subject code 616
    Language English
    Publishing date 2018-01-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  5. Article ; Online: Demonstration of the functional impact of vasopressin signaling in the thick ascending limb by a targeted transgenic rat approach.

    Mutig, Kerim / Borowski, Tordis / Boldt, Christin / Borschewski, Aljona / Paliege, Alexander / Popova, Elena / Bader, Michael / Bachmann, Sebastian

    American journal of physiology. Renal physiology

    2016  Volume 311, Issue 2, Page(s) F411–23

    Abstract: The antidiuretic hormone vasopressin (AVP) regulates renal salt and water reabsorption along the distal nephron and collecting duct system. These effects are mediated by vasopressin 2 receptors (V2R) and release of intracellular Gs-mediated cAMP to ... ...

    Abstract The antidiuretic hormone vasopressin (AVP) regulates renal salt and water reabsorption along the distal nephron and collecting duct system. These effects are mediated by vasopressin 2 receptors (V2R) and release of intracellular Gs-mediated cAMP to activate epithelial transport proteins. Inactivating mutations in the V2R gene lead to the X-linked form of nephrogenic diabetes insipidus (NDI), which has chiefly been related with impaired aquaporin 2-mediated water reabsorption in the collecting ducts. Previous work also suggested the AVP-V2R-mediated activation of Na(+)-K(+)-2Cl(-)-cotransporters (NKCC2) along the thick ascending limb (TAL) in the context of urine concentration, but its individual contribution to NDI or, more generally, to overall renal function was unclear. We hypothesized that V2R-mediated effects in TAL essentially determine its reabsorptive function. To test this, we reevaluated V2R expression. Basolateral membranes of medullary and cortical TAL were clearly stained, whereas cells of the macula densa were unreactive. A dominant-negative, NDI-causing truncated V2R mutant (Ni3-Glu242stop) was then introduced into the rat genome under control of the Tamm-Horsfall protein promoter to cause a tissue-specific AVP-signaling defect exclusively in TAL. Resulting Ni3-V2R transgenic rats revealed decreased basolateral but increased intracellular V2R signal in TAL epithelia, suggesting impaired trafficking of the receptor. Rats displayed significant baseline polyuria, failure to concentrate the urine in response to water deprivation, and hypercalciuria. NKCC2 abundance, phosphorylation, and surface expression were markedly decreased. In summary, these data indicate that suppression of AVP-V2R signaling in TAL causes major impairment in renal fluid and electrolyte handling. Our results may have clinical implications.
    MeSH term(s) Animals ; Carrier Proteins/metabolism ; Cyclic AMP/metabolism ; Cyclooxygenase 2/metabolism ; Diabetes Insipidus, Nephrogenic/genetics ; Epithelium/metabolism ; Genetic Diseases, X-Linked/genetics ; Juxtaglomerular Apparatus/metabolism ; Kidney/physiology ; Kidney/ultrastructure ; Kidney Cortex/metabolism ; Kidney Medulla/metabolism ; Rats ; Rats, Sprague-Dawley ; Rats, Transgenic ; Receptors, Vasopressin/genetics ; Signal Transduction/genetics ; Signal Transduction/physiology ; Solute Carrier Family 12, Member 1/genetics ; Solute Carrier Family 12, Member 1/metabolism ; Vasopressins/genetics ; Vasopressins/physiology
    Chemical Substances Carrier Proteins ; Receptors, Vasopressin ; Slc12a1 protein, rat ; Solute Carrier Family 12, Member 1 ; V2 vasopressin receptor, rat ; Vasopressins (11000-17-2) ; Cyclic AMP (E0399OZS9N) ; Cyclooxygenase 2 (EC 1.14.99.1)
    Language English
    Publishing date 2016-08-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 603837-2
    ISSN 1522-1466 ; 0363-6127
    ISSN (online) 1522-1466
    ISSN 0363-6127
    DOI 10.1152/ajprenal.00126.2016
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Molecular analysis of varicella vaccines and varicella-zoster virus from vaccine-related skin lesions.

    Thiele, Sonja / Borschewski, Aljona / Küchler, Judit / Bieberbach, Marc / Voigt, Sebastian / Ehlers, Bernhard

    Clinical and vaccine immunology : CVI

    2011  Volume 18, Issue 7, Page(s) 1058–1066

    Abstract: To prevent complications that might follow an infection with varicella-zoster virus (VZV), the live attenuated Oka strain (V-Oka) is administered to children in many developed countries. Three vaccine brands (Varivax from Sanofi Pasteur MSD; Varilrix and ...

    Abstract To prevent complications that might follow an infection with varicella-zoster virus (VZV), the live attenuated Oka strain (V-Oka) is administered to children in many developed countries. Three vaccine brands (Varivax from Sanofi Pasteur MSD; Varilrix and Priorix-Tetra, both from Glaxo-Smith-Kline) are licensed in Germany and have been associated with both different degrees of vaccine effectiveness and adverse effects. To identify genetic variants in the vaccines that might contribute to rash-associated syndromes, single nucleotide polymorphism (SNP) profiles of variants from the three vaccines and rash-associated vaccine-type VZV from German vaccinees were quantitatively compared by PCR-based pyrosequencing (PSQ). The Varivax vaccine contained an estimated 3-fold higher diversity of VZV variants, with 20% more wild-type (wt) SNPs than Varilrix and Priorix-Tetra. These minor VZV variants in the vaccines were identified by analyzing cloned full-length open reading frame (ORF) orf62 sequences by chain termination sequencing and PSQ. Some of these sequences amplified from vaccine VZV were very similar or identical to those of the rash-associated vaccine-type VZV from vaccinees and were almost exclusively detected in Varivax. Therefore, minorities of rash-associated VZV variants are present in varicella vaccine formulations, and it can be concluded that the analysis of a core set of four SNPs is required as a minimum for a firm diagnostic differentiation of vaccine-type VZV from wt VZV.
    MeSH term(s) Animals ; Chickenpox Vaccine/adverse effects ; Child ; DNA, Viral/genetics ; Exanthema/etiology ; Exanthema/virology ; Herpesvirus 3, Human/genetics ; Humans ; Polymorphism, Single Nucleotide ; Sequence Analysis, DNA ; Skin Diseases/etiology ; Skin Diseases/virology
    Chemical Substances Chickenpox Vaccine ; DNA, Viral
    Language English
    Publishing date 2011-05-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2221082-9
    ISSN 1556-679X ; 1556-6811
    ISSN (online) 1556-679X
    ISSN 1556-6811
    DOI 10.1128/CVI.05021-11
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Calcineurin and Sorting-Related Receptor with A-Type Repeats Interact to Regulate the Renal Na⁺-K⁺-2Cl⁻ Cotransporter.

    Borschewski, Aljona / Himmerkus, Nina / Boldt, Christin / Blankenstein, Katharina I / McCormick, James A / Lazelle, Rebecca / Willnow, Thomas E / Jankowski, Vera / Plain, Allein / Bleich, Markus / Ellison, David H / Bachmann, Sebastian / Mutig, Kerim

    Journal of the American Society of Nephrology : JASN

    2016  Volume 27, Issue 1, Page(s) 107–119

    Abstract: The furosemide-sensitive Na(+)-K(+)-2Cl(-)-cotransporter (NKCC2) is crucial for NaCl reabsorption in kidney thick ascending limb (TAL) and drives the urine concentrating mechanism. NKCC2 activity is modulated by N-terminal phosphorylation and ... ...

    Abstract The furosemide-sensitive Na(+)-K(+)-2Cl(-)-cotransporter (NKCC2) is crucial for NaCl reabsorption in kidney thick ascending limb (TAL) and drives the urine concentrating mechanism. NKCC2 activity is modulated by N-terminal phosphorylation and dephosphorylation. Serine-threonine kinases that activate NKCC2 have been identified, but less is known about phosphatases that deactivate NKCC2. Inhibition of calcineurin phosphatase has been shown to stimulate transport in the TAL and the distal convoluted tubule. Here, we identified NKCC2 as a target of the calcineurin Aβ isoform. Short-term cyclosporine administration in mice augmented the abundance of phospho-NKCC2, and treatment of isolated TAL with cyclosporine increased the chloride affinity and transport activity of NKCC2. Because sorting-related receptor with A-type repeats (SORLA) may affect NKCC2 phosphoregulation, we used SORLA-knockout mice to test whether SORLA is involved in calcineurin-dependent modulation of NKCC2. SORLA-deficient mice showed more calcineurin Aβ in the apical region of TAL cells and less NKCC2 phosphorylation and activity compared with littermate controls. In contrast, overexpression of SORLA in cultured cells reduced the abundance of endogenous calcineurin Aβ. Cyclosporine administration rapidly normalized the abundance of phospho-NKCC2 in SORLA-deficient mice, and a functional interaction between calcineurin Aβ and SORLA was further corroborated by binding assays in rat kidney extracts. In summary, we have shown that calcineurin Aβ and SORLA are key components in the phosphoregulation of NKCC2. These results may have clinical implications for immunosuppressive therapy using calcineurin inhibitors.
    MeSH term(s) Animals ; Calcineurin/physiology ; Kidney/metabolism ; Male ; Membrane Transport Proteins/physiology ; Mice ; Phosphorylation ; Rats ; Rats, Sprague-Dawley ; Receptors, LDL/physiology ; Sodium-Potassium-Chloride Symporters/physiology
    Chemical Substances Membrane Transport Proteins ; Receptors, LDL ; Sodium-Potassium-Chloride Symporters ; Sorl1 protein, mouse ; Calcineurin (EC 3.1.3.16) ; PPP3CB protein, human (EC 3.1.3.16)
    Language English
    Publishing date 2016-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1085942-1
    ISSN 1533-3450 ; 1046-6673
    ISSN (online) 1533-3450
    ISSN 1046-6673
    DOI 10.1681/ASN.2014070728
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Molecular analysis of varicella vaccines and varicella-zoster virus from vaccine-related skin lesions.

    Thiele, Sonja / Borschewski, Aljona / Küchler, Judit / Bieberbach, Marc / Voigt, Sebastian / Ehlers, Bernhard

    2011  

    Abstract: To prevent complications that might follow an infection with varicella-zoster virus (VZV), the live attenuated Oka strain (V-Oka) is administered to children in many developed countries. Three vaccine brands (Varivax from Sanofi Pasteur MSD; Varilrix and ...

    Abstract To prevent complications that might follow an infection with varicella-zoster virus (VZV), the live attenuated Oka strain (V-Oka) is administered to children in many developed countries. Three vaccine brands (Varivax from Sanofi Pasteur MSD; Varilrix and Priorix-Tetra, both from Glaxo-Smith-Kline) are licensed in Germany and have been associated with both different degrees of vaccine effectiveness and adverse effects. To identify genetic variants in the vaccines that might contribute to rash-associated syndromes, single nucleotide polymorphism (SNP) profiles of variants from the three vaccines and rash-associated vaccine-type VZV from German vaccinees were quantitatively compared by PCR-based pyrosequencing (PSQ). The Varivax vaccine contained an estimated 3-fold higher diversity of VZV variants, with 20% more wild-type (wt) SNPs than Varilrix and Priorix-Tetra. These minor VZV variants in the vaccines were identified by analyzing cloned full-length open reading frame (ORF) orf62 sequences by chain termination sequencing and PSQ. Some of these sequences amplified from vaccine VZV were very similar or identical to those of the rash-associated vaccine-type VZV from vaccinees and were almost exclusively detected in Varivax. Therefore, minorities of rash-associated VZV variants are present in varicella vaccine formulations, and it can be concluded that the analysis of a core set of four SNPs is required as a minimum for a firm diagnostic differentiation of vaccine-type VZV from wt VZV.
    Keywords Medizin ; Animals ; Humans ; Child ; Sequence Analysis DNA ; DNA Viral/genetics ; Chickenpox Vaccine/adverse effects ; Exanthema/etiology ; Exanthema/virology ; Herpesvirus 3 Human/genetics ; Polymorphism Single Nucleotide ; Skin Diseases/etiology ; Skin Diseases/virology ; ddc:610
    Subject code 630
    Language English
    Publishing date 2011-05-11
    Publisher Infektionskrankheiten / Erreger
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  9. Article ; Online: Molecular analysis of varicella vaccines and varicella-zoster virus from vaccine-related skin lesions.

    Thiele, Sonja / Borschewski, Aljona / Küchler, Judit / Bieberbach, Marc / Voigt, Sebastian / Ehlers, Bernhard

    2011  

    Abstract: To prevent complications that might follow an infection with varicella-zoster virus (VZV), the live attenuated Oka strain (V-Oka) is administered to children in many developed countries. Three vaccine brands (Varivax from Sanofi Pasteur MSD; Varilrix and ...

    Abstract To prevent complications that might follow an infection with varicella-zoster virus (VZV), the live attenuated Oka strain (V-Oka) is administered to children in many developed countries. Three vaccine brands (Varivax from Sanofi Pasteur MSD; Varilrix and Priorix-Tetra, both from Glaxo-Smith-Kline) are licensed in Germany and have been associated with both different degrees of vaccine effectiveness and adverse effects. To identify genetic variants in the vaccines that might contribute to rash-associated syndromes, single nucleotide polymorphism (SNP) profiles of variants from the three vaccines and rash-associated vaccine-type VZV from German vaccinees were quantitatively compared by PCR-based pyrosequencing (PSQ). The Varivax vaccine contained an estimated 3-fold higher diversity of VZV variants, with 20% more wild-type (wt) SNPs than Varilrix and Priorix-Tetra. These minor VZV variants in the vaccines were identified by analyzing cloned full-length open reading frame (ORF) orf62 sequences by chain termination sequencing and PSQ. Some of these sequences amplified from vaccine VZV were very similar or identical to those of the rash-associated vaccine-type VZV from vaccinees and were almost exclusively detected in Varivax. Therefore, minorities of rash-associated VZV variants are present in varicella vaccine formulations, and it can be concluded that the analysis of a core set of four SNPs is required as a minimum for a firm diagnostic differentiation of vaccine-type VZV from wt VZV.
    Keywords Animals ; Humans ; Child ; Sequence Analysis DNA ; DNA Viral/genetics ; Chickenpox Vaccine/adverse effects ; Exanthema/etiology ; Exanthema/virology ; Herpesvirus 3 Human/genetics ; Polymorphism Single Nucleotide ; Skin Diseases/etiology ; Skin Diseases/virology ; 610 Medizin ; ddc:610
    Language English
    Publishing date 2011-05-11
    Publisher Robert Koch-Institut, Infektionskrankheiten / Erreger
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  10. Article ; Online: SPAK differentially mediates vasopressin effects on sodium cotransporters.

    Saritas, Turgay / Borschewski, Aljona / McCormick, James A / Paliege, Alexander / Dathe, Christin / Uchida, Shinichi / Terker, Andrew / Himmerkus, Nina / Bleich, Markus / Demaretz, Sylvie / Laghmani, Kamel / Delpire, Eric / Ellison, David H / Bachmann, Sebastian / Mutig, Kerim

    Journal of the American Society of Nephrology : JASN

    2013  Volume 24, Issue 3, Page(s) 407–418

    Abstract: Activation of the Na(+)-K(+)-2Cl(-)-cotransporter (NKCC2) and the Na(+)-Cl(-)-cotransporter (NCC) by vasopressin includes their phosphorylation at defined, conserved N-terminal threonine and serine residues, but the kinase pathways that mediate this ... ...

    Abstract Activation of the Na(+)-K(+)-2Cl(-)-cotransporter (NKCC2) and the Na(+)-Cl(-)-cotransporter (NCC) by vasopressin includes their phosphorylation at defined, conserved N-terminal threonine and serine residues, but the kinase pathways that mediate this action of vasopressin are not well understood. Two homologous Ste20-like kinases, SPS-related proline/alanine-rich kinase (SPAK) and oxidative stress responsive kinase (OSR1), can phosphorylate the cotransporters directly. In this process, a full-length SPAK variant and OSR1 interact with a truncated SPAK variant, which has inhibitory effects. Here, we tested whether SPAK is an essential component of the vasopressin stimulatory pathway. We administered desmopressin, a V2 receptor-specific agonist, to wild-type mice, SPAK-deficient mice, and vasopressin-deficient rats. Desmopressin induced regulatory changes in SPAK variants, but not in OSR1 to the same degree, and activated NKCC2 and NCC. Furthermore, desmopressin modulated both the full-length and truncated SPAK variants to interact with and phosphorylate NKCC2, whereas only full-length SPAK promoted the activation of NCC. In summary, these results suggest that SPAK mediates the effect of vasopressin on sodium reabsorption along the distal nephron.
    MeSH term(s) Animals ; Deamino Arginine Vasopressin/pharmacology ; Enzyme Activation/drug effects ; Kidney/drug effects ; Kidney/metabolism ; Male ; Mice ; Mice, Knockout ; Phosphorylation ; Protein Kinases/metabolism ; Protein-Serine-Threonine Kinases/deficiency ; Protein-Serine-Threonine Kinases/genetics ; Protein-Serine-Threonine Kinases/metabolism ; Rats ; Rats, Brattleboro ; Receptors, Vasopressin/agonists ; Sodium Chloride Symporters/metabolism ; Sodium-Potassium-Chloride Symporters/metabolism ; Solute Carrier Family 12, Member 1
    Chemical Substances Receptors, Vasopressin ; Slc12a1 protein, mouse ; Slc12a1 protein, rat ; Sodium Chloride Symporters ; Sodium-Potassium-Chloride Symporters ; Solute Carrier Family 12, Member 1 ; Protein Kinases (EC 2.7.-) ; Stk39 protein, mouse (EC 2.7.1.-) ; PAS domain kinases (EC 2.7.1.11) ; OXSR1 protein, mouse (EC 2.7.11.1) ; Oxsr1 protein, rat (EC 2.7.11.1) ; Protein-Serine-Threonine Kinases (EC 2.7.11.1) ; Deamino Arginine Vasopressin (ENR1LLB0FP)
    Language English
    Publishing date 2013-02-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1085942-1
    ISSN 1533-3450 ; 1046-6673
    ISSN (online) 1533-3450
    ISSN 1046-6673
    DOI 10.1681/ASN.2012040404
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top