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  1. Article ; Online: New functions and roles of the Na

    Dominguez Rieg, Jessica A / Rieg, Timo

    Pflugers Archiv : European journal of physiology

    2024  Volume 476, Issue 4, Page(s) 505–516

    Abstract: The sodium/proton exchanger isoform 3 (NHE3) is expressed in the intestine and the kidney, where it contributes to hydrogen secretion and sodium (re)absorption. The roles of this transporter have been studied by the use of the respective knockout mice ... ...

    Abstract The sodium/proton exchanger isoform 3 (NHE3) is expressed in the intestine and the kidney, where it contributes to hydrogen secretion and sodium (re)absorption. The roles of this transporter have been studied by the use of the respective knockout mice and by using pharmacological inhibitors. Whole-body NHE3 knockout mice suffer from a high mortality rate (with only ∼30% of mice surviving into adulthood), and based on the expression of NHE3 in both intestine and kidney, some conclusions that were originally derived were based on this rather complex phenotype. In the last decade, more refined models have been developed that added temporal and spatial control of NHE3 expression. For example, novel mouse models have been developed with a knockout of NHE3 in intestinal epithelial cells, tubule/collecting duct of the kidney, proximal tubule of the kidney, and thick ascending limb of the kidney. These refined models have significantly contributed to our understanding of the role of NHE3 in a tissue/cell type-specific manner. In addition, tenapanor was developed, which is a non-absorbable, intestine-specific NHE3 inhibitor. In rat and human studies, tenapanor lowered intestinal P
    MeSH term(s) Animals ; Humans ; Mice ; Rats ; Isoquinolines ; Mice, Knockout ; Sodium/metabolism ; Sodium-Hydrogen Exchanger 3/metabolism ; Sodium-Hydrogen Exchangers/genetics ; Sodium-Hydrogen Exchangers/metabolism ; Sulfonamides
    Chemical Substances Isoquinolines ; Sodium (9NEZ333N27) ; Sodium-Hydrogen Exchanger 3 ; Sodium-Hydrogen Exchangers ; Sulfonamides ; tenapanor (WYD79216A6) ; SLC9A3 protein, human
    Language English
    Publishing date 2024-03-07
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 6380-0
    ISSN 1432-2013 ; 0031-6768
    ISSN (online) 1432-2013
    ISSN 0031-6768
    DOI 10.1007/s00424-024-02938-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Npt2a as a target for treating hyperphosphatemia.

    Thomas, Linto / Dominguez Rieg, Jessica A / Rieg, Timo

    Biochemical Society transactions

    2022  Volume 50, Issue 1, Page(s) 439–446

    Abstract: Hyperphosphatemia results from an imbalance in phosphate (Pi) homeostasis. In patients with and without reduced kidney function, hyperphosphatemia is associated with cardiovascular complications. The current mainstays in the management of ... ...

    Abstract Hyperphosphatemia results from an imbalance in phosphate (Pi) homeostasis. In patients with and without reduced kidney function, hyperphosphatemia is associated with cardiovascular complications. The current mainstays in the management of hyperphosphatemia are oral Pi binder and dietary Pi restriction. Although these options are employed in patients with chronic kidney disease (CKD), they seem inadequate to correct elevated plasma Pi levels. In addition, a paradoxical increase in expression of intestinal Pi transporter and uptake may occur. Recently, studies in rodents targeting the renal Na+/Pi cotransporter 2a (Npt2a), responsible for ∼70% of Pi reabsorption, have been proposed as a potential treatment option. Two compounds (PF-06869206 and BAY-767) have been developed which are selective for Npt2a. These Npt2a inhibitors significantly increased urinary Pi excretion consequently lowering plasma Pi and PTH levels. Additionally, increases in urinary excretions of Na+, Cl- and Ca2+ have been observed. Some of these results are also seen in models of reduced kidney function. Responses of FGF23, a phosphaturic hormone that has been linked to the development of left ventricular hypertrophy in CKD, are ambiguous. In this review, we discuss the recent advances on the role of Npt2a inhibition on Pi homeostasis as well as other pleiotropic effects observed with Npt2a inhibition.
    MeSH term(s) Animals ; Female ; Humans ; Hyperphosphatemia/drug therapy ; Male ; Mice ; Mice, Knockout ; Parathyroid Hormone/metabolism ; Phosphates/metabolism ; Renal Insufficiency, Chronic/drug therapy ; Renal Insufficiency, Chronic/metabolism ; Sodium-Phosphate Cotransporter Proteins, Type IIa/metabolism
    Chemical Substances Parathyroid Hormone ; Phosphates ; Sodium-Phosphate Cotransporter Proteins, Type IIa
    Language English
    Publishing date 2022-01-07
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Review
    ZDB-ID 184237-7
    ISSN 1470-8752 ; 0300-5127
    ISSN (online) 1470-8752
    ISSN 0300-5127
    DOI 10.1042/BST20211005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Intravenous ferric carboxymaltose and ferric derisomaltose alter the intestinal microbiome in female iron-deficient anemic mice.

    Rieg, Timo / Xue, Jianxiang / Stevens, Monica / Thomas, Linto / White, James R / Dominguez Rieg, Jessica A

    Bioscience reports

    2023  Volume 43, Issue 9

    Abstract: Iron deficiency anemia (IDA) is a leading global health concern affecting approximately 30% of the population. Treatment for IDA consists of replenishment of iron stores, either by oral or intravenous (IV) supplementation. There is a complex ... ...

    Abstract Iron deficiency anemia (IDA) is a leading global health concern affecting approximately 30% of the population. Treatment for IDA consists of replenishment of iron stores, either by oral or intravenous (IV) supplementation. There is a complex bidirectional interplay between the gut microbiota, the host's iron status, and dietary iron availability. Dietary iron deficiency and supplementation can influence the gut microbiome; however, the effect of IV iron on the gut microbiome is unknown. We studied how commonly used IV iron preparations, ferric carboxymaltose (FCM) and ferric derisomaltose (FDI), affected the gut microbiome in female iron-deficient anemic mice. At the phylum level, vehicle-treated mice showed an expansion in Verrucomicrobia, mostly because of the increased abundance of Akkermansia muciniphila, along with contraction in Firmicutes, resulting in a lower Firmicutes/Bacteroidetes ratio (indicator of dysbiosis). Treatment with either FCM or FDI restored the microbiome such that Firmicutes and Bacteroidetes were the dominant phyla. Interestingly, the phyla Proteobacteria and several members of Bacteroidetes (e.g., Alistipes) were expanded in mice treated with FCM compared with those treated with FDI. In contrast, several Clostridia class members were expanded in mice treated with FDI compared with FCM (e.g., Dorea spp., Eubacterium). Our data demonstrate that IV iron increases gut microbiome diversity independently of the iron preparation used; however, differences exist between FCM and FDI treatments. In conclusion, replenishing iron stores with IV iron preparations in clinical conditions, such as inflammatory bowel disease or chronic kidney disease, could affect gut microbiome composition and consequently contribute to an altered disease outcome.
    MeSH term(s) Female ; Animals ; Mice ; Iron ; Gastrointestinal Microbiome ; Disaccharides ; Iron, Dietary ; Bacteroidetes ; Firmicutes
    Chemical Substances ferric derisomaltose (AHU547PI9H) ; ferric carboxymaltose (6897GXD6OE) ; Iron (E1UOL152H7) ; Disaccharides ; Iron, Dietary
    Language English
    Publishing date 2023-09-06
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 764946-0
    ISSN 1573-4935 ; 0144-8463
    ISSN (online) 1573-4935
    ISSN 0144-8463
    DOI 10.1042/BSR20231217
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Sodium phosphate cotransporter 2a inhibitors: potential therapeutic uses.

    Xue, Jianxiang / Thomas, Linto / Dominguez Rieg, Jessica A / Rieg, Timo

    Current opinion in nephrology and hypertension

    2022  Volume 31, Issue 5, Page(s) 486–492

    Abstract: Purpose of review: Targeting sodium phosphate cotransporter 2a (Npt2a) offers a novel strategy for treating hyperphosphatemia in chronic kidney disease (CKD). Here we review recent studies on the efficacy of Npt2a inhibition, its plasma phosphate (Pi)- ... ...

    Abstract Purpose of review: Targeting sodium phosphate cotransporter 2a (Npt2a) offers a novel strategy for treating hyperphosphatemia in chronic kidney disease (CKD). Here we review recent studies on the efficacy of Npt2a inhibition, its plasma phosphate (Pi)-lowering effects, as well as potential "off-target" beneficial effects on cardiovascular consequences.
    Recent findings: Two novel Npt2a-selective inhibitors (PF-06869206 and BAY-767) have been developed. Pharmacological Npt2a inhibition shows a significant phosphaturic effect and consequently lowers plasma Pi and parathyroid hormone (PTH) levels regardless of CKD. However, plasma fibroblast growth factor 23 (FGF23), a master regulator of Pi homeostasis, shows inconsistent responses between these two inhibitors (no effect by PF-06869206 vs. reduction by BAY-767). In addition to the effects on Pi homeostasis, Npt2a inhibition also enhances urinary excretions of Na+, Cl-, and Ca2+, which is recapitulated in animal models with reduced kidney function. The effect of Npt2a inhibition by BAY-767 on vascular calcification has been studied, with positive results showing that oral treatment with BAY-767 (10 mg kg-1) attenuated the increases in plasma Pi and Ca2+ content in the aorta under the setting of vascular calcification induced by a pan-FGF receptor inhibitor. Together, Npt2a inhibition offers a promising therapeutic approach for treating hyperphosphatemia and reducing cardiovascular complications in CKD.
    Summary: Npt2a inhibition significantly increases urinary Pi excretion and lowers plasma Pi and PTH levels; moreover, it exerts pleiotropic "off-target" effects, providing a novel treatment for hyperphosphatemia and exhibiting beneficial potential for cardiovascular complications in CKD.
    MeSH term(s) Animals ; Calcium/metabolism ; Fibroblast Growth Factors/metabolism ; Humans ; Hyperphosphatemia/drug therapy ; Hyperphosphatemia/etiology ; Parathyroid Hormone/metabolism ; Phosphates/metabolism ; Renal Insufficiency, Chronic/complications ; Renal Insufficiency, Chronic/drug therapy ; Sodium-Phosphate Cotransporter Proteins, Type IIa/antagonists & inhibitors ; Vascular Calcification
    Chemical Substances Parathyroid Hormone ; Phosphates ; Sodium-Phosphate Cotransporter Proteins, Type IIa ; Fibroblast Growth Factors (62031-54-3) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2022-07-18
    Publishing country England
    Document type Journal Article ; Review ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1151092-4
    ISSN 1473-6543 ; 1535-3842 ; 1062-4813 ; 1062-4821
    ISSN (online) 1473-6543 ; 1535-3842
    ISSN 1062-4813 ; 1062-4821
    DOI 10.1097/MNH.0000000000000828
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Epac induces ryanodine receptor-dependent intracellular and inter-organellar calcium mobilization in mpkCCD cells.

    Yip, Kay-Pong / Ribeiro-Silva, Luisa / Cha, Byeong / Rieg, Timo / Sham, James S K

    Frontiers in physiology

    2023  Volume 14, Page(s) 1250273

    Abstract: Arginine vasopressin (AVP) induces an increase in intracellular ... ...

    Abstract Arginine vasopressin (AVP) induces an increase in intracellular Ca
    Language English
    Publishing date 2023-08-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2564217-0
    ISSN 1664-042X
    ISSN 1664-042X
    DOI 10.3389/fphys.2023.1250273
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book: Über Leichen zum Examen?

    Rieg, Timo

    Tierversuche im Studium ; ein Diskussions- und Arbeitsbuch

    (Tierschutz aktiv ; 1)

    1996  

    Institution Bundesverband Studentischer Arbeitsgruppen gegen Tiermissbrauch im Studium
    Author's details Bundesverband SATIS e.V. (Hrsg.). Von Timo Rieg
    Series title Tierschutz aktiv ; 1
    Collection
    Keywords Education, Medical ; Biology / education ; Ethics, Institutional ; Animals, Laboratory ; Animal Testing Alternatives ; Animal Welfare ; Medizinstudium ; Tierversuch
    Subject Experiment ; Tierexperiment ; Medizin ; Medizinisches Studium
    Language German
    Size 458 S. : Ill.
    Edition 2., überarb. Aufl.
    Publisher Timona-Verl
    Publishing place Bochum
    Publishing country Germany
    Document type Book
    HBZ-ID HT007341464
    ISBN 3-928781-32-4 ; 978-3-928781-32-9
    Database Catalogue ZB MED Medicine, Health

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  7. Article ; Online: Intestine-Specific NHE3 Deletion in Adulthood Causes Microbial Dysbiosis.

    Xue, Jianxiang / Dominguez Rieg, Jessica A / Thomas, Linto / White, James R / Rieg, Timo

    Frontiers in cellular and infection microbiology

    2022  Volume 12, Page(s) 896309

    Abstract: In the intestine, the ... ...

    Abstract In the intestine, the Na
    MeSH term(s) Adult ; Animals ; Bacteroidetes ; Dysbiosis/microbiology ; Firmicutes ; Gastrointestinal Microbiome ; Humans ; Inflammatory Bowel Diseases/microbiology ; Intestines/microbiology ; Mice ; Sodium-Hydrogen Exchanger 3/genetics
    Chemical Substances SLC9A3 protein, human ; Slc9a3 protein, mouse ; Sodium-Hydrogen Exchanger 3
    Language English
    Publishing date 2022-05-26
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2619676-1
    ISSN 2235-2988 ; 2235-2988
    ISSN (online) 2235-2988
    ISSN 2235-2988
    DOI 10.3389/fcimb.2022.896309
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: NHE3 in the thick ascending limb is required for sustained but not acute furosemide-induced urinary acidification.

    Xue, Jianxiang / Thomas, Linto / Dominguez Rieg, Jessica A / Fenton, Robert A / Rieg, Timo

    American journal of physiology. Renal physiology

    2022  Volume 323, Issue 2, Page(s) F141–F155

    Abstract: ... ...

    Abstract Na
    MeSH term(s) Alkalosis ; Animals ; Furosemide/pharmacology ; Hydrogen-Ion Concentration ; Mice ; Sodium/metabolism ; Sodium-Hydrogen Exchanger 3/genetics ; Sodium-Hydrogen Exchangers/genetics ; Sodium-Hydrogen Exchangers/metabolism
    Chemical Substances Sodium-Hydrogen Exchanger 3 ; Sodium-Hydrogen Exchangers ; Furosemide (7LXU5N7ZO5) ; Sodium (9NEZ333N27)
    Language English
    Publishing date 2022-05-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural
    ZDB-ID 603837-2
    ISSN 1522-1466 ; 0363-6127
    ISSN (online) 1522-1466
    ISSN 0363-6127
    DOI 10.1152/ajprenal.00013.2022
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Die rechtlichen Regelungen von Eingriffen und Behandlungen an Tieren zur Aus-, Fort- und Weiterbildung 123 128 DE Rieg Timo D-Bochum Löblein Claus-M. The German constitution (1948) states that University professors have the complete freedom in the choice of aims and means for their teaching, and that no other law of regulation may restrict this freedom. This unconditional academic freedom ("akademische Lehrfreiheit") comes into conflict with the more recent Animal Rights Law ("Tierschutzgesetz) which e.g. restricts the use of animals for demonstration purposes. The following dissertation explains the regulations concerning animal experiments in education, the question of the protection of animals as guaranteed in the constitution, and possible ethical limits of the academic freedom. Very recently an Animal Protection Authority has issued an order to forestall animal experiments in teaching. This official attempt has now been annulled by a temporary injunction of the administrative Court, Kassel.

    Rieg, Timo / Löblein, Claus-M.

    ALTEX

    1995  Volume 12, Issue 3, Page(s) 123–128

    Abstract: The German constitution (1948) states that University professors have the complete freedom in the choice of aims and means for their teaching, and that no other law of regulation may restrict this freedom. This unconditional academic freedom (" ... ...

    Title translation The regulations concerning animal experiments in education by the German Animal Rights Law
    Abstract The German constitution (1948) states that University professors have the complete freedom in the choice of aims and means for their teaching, and that no other law of regulation may restrict this freedom. This unconditional academic freedom ("akademische Lehrfreiheit") comes into conflict with the more recent Animal Rights Law ("Tierschutzgesetz) which e.g. restricts the use of animals for demonstration purposes. The following dissertation explains the regulations concerning animal experiments in education, the question of the protection of animals as guaranteed in the constitution, and possible ethical limits of the academic freedom. Very recently an Animal Protection Authority has issued an order to forestall animal experiments in teaching. This official attempt has now been annulled by a temporary injunction of the administrative Court, Kassel.
    Language English
    Publishing date 1995
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 165707-0
    ISSN 1868-596X ; 1018-4562 ; 0946-7785
    ISSN 1868-596X ; 1018-4562 ; 0946-7785
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Tubular effects of sodium-glucose cotransporter 2 inhibitors: intended and unintended consequences.

    Dominguez Rieg, Jessica A / Xue, Jianxiang / Rieg, Timo

    Current opinion in nephrology and hypertension

    2020  Volume 29, Issue 5, Page(s) 523–530

    Abstract: Purpose of review: Sodium-glucose cotransporter 2 (SGLT2) inhibitors are antihyperglycemic drugs that act by inhibiting renal sodium-glucose cotransport. Here we present new insights into 'off target', or indirect, effects of SGLT2 inhibitors.: Recent ...

    Abstract Purpose of review: Sodium-glucose cotransporter 2 (SGLT2) inhibitors are antihyperglycemic drugs that act by inhibiting renal sodium-glucose cotransport. Here we present new insights into 'off target', or indirect, effects of SGLT2 inhibitors.
    Recent findings: SGLT2 inhibition causes an acute increase in urinary glucose excretion. In addition to lowering blood glucose, there are several other effects that contribute to the overall beneficial renal and cardiovascular effects. Reabsorption of about 66% of sodium is accomplished in the proximal tubule and dependent on the sodium-hydrogen exchanger isoform 3 (NHE3). SGLT2 colocalizes with NHE3, and high glucose levels reduce NHE3 activity. The proximal tubule is also responsible for the majority of phosphate (Pi) reabsorption. SGLT2 inhibition is associated with increases in plasma Pi, fibroblast growth factor 23 and parathyroid hormone levels in nondiabetics and type 2 diabetes mellitus. Studies in humans identified a urate-lowering effect by SGLT2 inhibition which is possibly mediated by urate transporter 1 (URAT1) and/or glucose transporter member 9 in the proximal tubule. Of note, magnesium levels were also found to increase under SGLT2 inhibition, an effect that was preserved in nondiabetic patients with hypomagnesemia.
    Summary: Cardiorenal effects of SGLT2 inhibition might involve, in addition to direct effects on glucose homeostasis, effects on NHE3, phosphate, urate, and magnesium homeostasis.
    MeSH term(s) Humans ; Hypoglycemic Agents/pharmacology ; Kidney Tubules, Proximal/drug effects ; Kidney Tubules, Proximal/metabolism ; Magnesium/metabolism ; Sodium-Glucose Transporter 2 Inhibitors/pharmacology ; Sodium-Hydrogen Exchanger 3/metabolism
    Chemical Substances Hypoglycemic Agents ; Sodium-Glucose Transporter 2 Inhibitors ; Sodium-Hydrogen Exchanger 3 ; Magnesium (I38ZP9992A)
    Language English
    Publishing date 2020-07-22
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1151092-4
    ISSN 1473-6543 ; 1535-3842 ; 1062-4813 ; 1062-4821
    ISSN (online) 1473-6543 ; 1535-3842
    ISSN 1062-4813 ; 1062-4821
    DOI 10.1097/MNH.0000000000000632
    Database MEDical Literature Analysis and Retrieval System OnLINE

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