Amino alcohol- (NPS-2143) and quinazolinone-derived calcilytics (ATF936 and AXT914) differentially mitigate excessive signalling of calcium-sensing receptor mutants causing Bartter syndrome Type 5 and autosomal dominant hypocalcemia

Activating calcium sensing receptor (CaSR) mutations cause autosomal dominant hypocalcemia (ADH) characterized by low serum calcium, inappropriately low PTH and relative hypercalciuria. Four activating CaSR mutations cause additional renal wasting of sodium, chloride and other salts, a condition cal...

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Veröffentlicht in:PloS one 2014-12, Vol.9 (12), p.e115178-e115178
Hauptverfasser: Letz, Saskia, Haag, Christine, Schulze, Egbert, Frank-Raue, Karin, Raue, Friedhelm, Hofner, Benjamin, Mayr, Bernhard, Schöfl, Christof
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container_end_page e115178
container_issue 12
container_start_page e115178
container_title PloS one
container_volume 9
creator Letz, Saskia
Haag, Christine
Schulze, Egbert
Frank-Raue, Karin
Raue, Friedhelm
Hofner, Benjamin
Mayr, Bernhard
Schöfl, Christof
description Activating calcium sensing receptor (CaSR) mutations cause autosomal dominant hypocalcemia (ADH) characterized by low serum calcium, inappropriately low PTH and relative hypercalciuria. Four activating CaSR mutations cause additional renal wasting of sodium, chloride and other salts, a condition called Bartter syndrome (BS) type 5. Until today there is no specific medical treatment for BS type 5 and ADH. We investigated the effects of different allosteric CaSR antagonists (calcilytics) on activating CaSR mutants. All 4 known mutations causing BS type 5 and five ADH mutations were expressed in HEK 293T cells and receptor signalling was studied by measurement of intracellular free calcium in response to extracellular calcium ([Ca2+]o). To investigate the effect of calcilytics, cells were stimulated with 3 mM [Ca2+]o in the presence or absence of NPS-2143, ATF936 or AXT914. All BS type 5 and ADH mutants showed enhanced signalling activity to [Ca2+]o with left shifted dose response curves. In contrast to the amino alcohol NPS-2143, which was only partially effective, the quinazolinone calcilytics ATF936 and AXT914 significantly mitigated excessive cytosolic calcium signalling of all BS type 5 and ADH mutants studied. When these mutants were co-expressed with wild-type CaSR to approximate heterozygosity in patients, ATF936 and AXT914 were also effective on all mutants. The calcilytics ATF936 and AXT914 are capable of attenuating enhanced cytosolic calcium signalling activity of CaSR mutations causing BS type 5 and ADH. Quinazolinone calcilytics might therefore offer a novel treatment option for patients with activating CaSR mutations.
doi_str_mv 10.1371/journal.pone.0115178
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Four activating CaSR mutations cause additional renal wasting of sodium, chloride and other salts, a condition called Bartter syndrome (BS) type 5. Until today there is no specific medical treatment for BS type 5 and ADH. We investigated the effects of different allosteric CaSR antagonists (calcilytics) on activating CaSR mutants. All 4 known mutations causing BS type 5 and five ADH mutations were expressed in HEK 293T cells and receptor signalling was studied by measurement of intracellular free calcium in response to extracellular calcium ([Ca2+]o). To investigate the effect of calcilytics, cells were stimulated with 3 mM [Ca2+]o in the presence or absence of NPS-2143, ATF936 or AXT914. All BS type 5 and ADH mutants showed enhanced signalling activity to [Ca2+]o with left shifted dose response curves. In contrast to the amino alcohol NPS-2143, which was only partially effective, the quinazolinone calcilytics ATF936 and AXT914 significantly mitigated excessive cytosolic calcium signalling of all BS type 5 and ADH mutants studied. When these mutants were co-expressed with wild-type CaSR to approximate heterozygosity in patients, ATF936 and AXT914 were also effective on all mutants. The calcilytics ATF936 and AXT914 are capable of attenuating enhanced cytosolic calcium signalling activity of CaSR mutations causing BS type 5 and ADH. 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genetics</topic><topic>Biology and Life Sciences</topic><topic>Calcium</topic><topic>Calcium (blood)</topic><topic>Calcium (extracellular)</topic><topic>Calcium (intracellular)</topic><topic>Calcium - metabolism</topic><topic>Calcium ions</topic><topic>Calcium Signaling - drug effects</topic><topic>Calcium Signaling - genetics</topic><topic>Calcium signalling</topic><topic>Calcium-sensing receptors</topic><topic>Confidence intervals</topic><topic>Diabetes</topic><topic>Drug dosages</topic><topic>Endocrinology</topic><topic>HEK293 Cells</topic><topic>Heterozygosity</topic><topic>Humans</topic><topic>Hypercalciuria</topic><topic>Hypercalciuria - genetics</topic><topic>Hypocalcemia</topic><topic>Hypocalcemia - genetics</topic><topic>Hypoparathyroidism - congenital</topic><topic>Hypoparathyroidism - genetics</topic><topic>Intracellular signalling</topic><topic>Medical treatment</topic><topic>Medicine and Health Sciences</topic><topic>Mutants</topic><topic>Mutation</topic><topic>Naphthalenes - 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Letz, Saskia</au><au>Haag, Christine</au><au>Schulze, Egbert</au><au>Frank-Raue, Karin</au><au>Raue, Friedhelm</au><au>Hofner, Benjamin</au><au>Mayr, Bernhard</au><au>Schöfl, Christof</au><au>Valenti, Giovanna</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Amino alcohol- (NPS-2143) and quinazolinone-derived calcilytics (ATF936 and AXT914) differentially mitigate excessive signalling of calcium-sensing receptor mutants causing Bartter syndrome Type 5 and autosomal dominant hypocalcemia</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2014-12-15</date><risdate>2014</risdate><volume>9</volume><issue>12</issue><spage>e115178</spage><epage>e115178</epage><pages>e115178-e115178</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Activating calcium sensing receptor (CaSR) mutations cause autosomal dominant hypocalcemia (ADH) characterized by low serum calcium, inappropriately low PTH and relative hypercalciuria. Four activating CaSR mutations cause additional renal wasting of sodium, chloride and other salts, a condition called Bartter syndrome (BS) type 5. Until today there is no specific medical treatment for BS type 5 and ADH. We investigated the effects of different allosteric CaSR antagonists (calcilytics) on activating CaSR mutants. All 4 known mutations causing BS type 5 and five ADH mutations were expressed in HEK 293T cells and receptor signalling was studied by measurement of intracellular free calcium in response to extracellular calcium ([Ca2+]o). To investigate the effect of calcilytics, cells were stimulated with 3 mM [Ca2+]o in the presence or absence of NPS-2143, ATF936 or AXT914. All BS type 5 and ADH mutants showed enhanced signalling activity to [Ca2+]o with left shifted dose response curves. In contrast to the amino alcohol NPS-2143, which was only partially effective, the quinazolinone calcilytics ATF936 and AXT914 significantly mitigated excessive cytosolic calcium signalling of all BS type 5 and ADH mutants studied. When these mutants were co-expressed with wild-type CaSR to approximate heterozygosity in patients, ATF936 and AXT914 were also effective on all mutants. The calcilytics ATF936 and AXT914 are capable of attenuating enhanced cytosolic calcium signalling activity of CaSR mutations causing BS type 5 and ADH. Quinazolinone calcilytics might therefore offer a novel treatment option for patients with activating CaSR mutations.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>25506941</pmid><doi>10.1371/journal.pone.0115178</doi><oa>free_for_read</oa></addata></record>
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subjects Alcohol
Alcohols
Allosteric properties
Antagonists
Bartter Syndrome - genetics
Biology and Life Sciences
Calcium
Calcium (blood)
Calcium (extracellular)
Calcium (intracellular)
Calcium - metabolism
Calcium ions
Calcium Signaling - drug effects
Calcium Signaling - genetics
Calcium signalling
Calcium-sensing receptors
Confidence intervals
Diabetes
Drug dosages
Endocrinology
HEK293 Cells
Heterozygosity
Humans
Hypercalciuria
Hypercalciuria - genetics
Hypocalcemia
Hypocalcemia - genetics
Hypoparathyroidism - congenital
Hypoparathyroidism - genetics
Intracellular signalling
Medical treatment
Medicine and Health Sciences
Mutants
Mutation
Naphthalenes - pharmacology
Parathyroid hormone
Patients
Quinazolinone
Quinazolinones - pharmacology
Receptors, Calcium-Sensing - drug effects
Receptors, Calcium-Sensing - genetics
Salts
Signal transduction
Sodium
Vitamin deficiency
title Amino alcohol- (NPS-2143) and quinazolinone-derived calcilytics (ATF936 and AXT914) differentially mitigate excessive signalling of calcium-sensing receptor mutants causing Bartter syndrome Type 5 and autosomal dominant hypocalcemia
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