2020
Different elemental infant formulas show equivalent phosphorus and calcium bioavailability in healthy volunteers
Bergwitz C, Eussen SRBM, Janssens PLHR, Visser M, Carpenter TO, van Helvoort A. Different elemental infant formulas show equivalent phosphorus and calcium bioavailability in healthy volunteers. Nutrition Research 2020, 85: 71-83. PMID: 33450668, DOI: 10.1016/j.nutres.2020.11.004.Peer-Reviewed Original ResearchConceptsGeometric mean ratiosAcid-suppressive medicationsArea under the curveHealthy volunteersSerum phosphateCalcium bioavailabilityGastric acid-suppressive medicationsRetrospective chart reviewSerum calcium concentrationBioavailability of phosphorusCross-over studyInfant formulaElemental formula useSingle oral doseCalcium excretionDouble-blindGram of phosphorusSingle-centerChart reviewOral doseOvernight fastingSerum phosphorusBioequivalence criteriaWashout periodMean ratios
2019
Endocrine regulation of MFS2 by branchless controls phosphate excretion and stone formation in Drosophila renal tubules
Rose E, Lee D, Xiao E, Zhao W, Wee M, Cohen J, Bergwitz C. Endocrine regulation of MFS2 by branchless controls phosphate excretion and stone formation in Drosophila renal tubules. Scientific Reports 2019, 9: 8798. PMID: 31217461, PMCID: PMC6584732, DOI: 10.1038/s41598-019-45269-x.Peer-Reviewed Original ResearchConceptsDrosophila renal tubulesFly life spanGenetic ablationRNAi-mediated knockdownInorganic phosphate (Pi) homeostasisHigh-Pi mediumPi transportersAdult fliesControl of FGF signalingHigher speciesPi mediumInduces expressionMFS2FGF signalingExcretion of PiPhosphate homeostasisDrosophilaFly longevityEndocrine regulationHormone fibroblast growth factor 23Renal tubulesHormonal controlPi transportFibroblast growth factor 23Genetic overexpression
2017
Response of Npt2a knockout mice to dietary calcium and phosphorus
Li Y, Caballero D, Ponsetto J, Chen A, Zhu C, Guo J, Demay M, Jüppner H, Bergwitz C. Response of Npt2a knockout mice to dietary calcium and phosphorus. PLOS ONE 2017, 12: e0176232. PMID: 28448530, PMCID: PMC5407772, DOI: 10.1371/journal.pone.0176232.Peer-Reviewed Original ResearchConceptsCompared to WT miceWT miceDietary calciumDietary phosphateCalcium x phosphorus productUrine phosphate levelsUrinary calcium excretionUrine anion gapDevelopment of novel therapiesWild-typeRenal stone diseaseWild-type miceNpt2a-knockout (KO) miceCalcium excretionFGF23 levelsNovel therapiesPreventing nephrolithiasisPlasma phosphateStone diseaseAnion gapAddition of calciumKnockout micePhosphorus productCalcium phosphate depositionHuman carriers
2010
Autoimmune Hypocalciuric Hypercalcemia Unresponsive to Glucocorticoid Therapy in a Patient with Blocking Autoantibodies against the Calcium-Sensing Receptor
Pallais JC, Kemp EH, Bergwitz C, Kantham L, Slovik DM, Weetman AP, Brown EM. Autoimmune Hypocalciuric Hypercalcemia Unresponsive to Glucocorticoid Therapy in a Patient with Blocking Autoantibodies against the Calcium-Sensing Receptor. The Journal Of Clinical Endocrinology & Metabolism 2010, 96: 672-680. PMID: 21159843, PMCID: PMC3047232, DOI: 10.1210/jc.2010-1739.Peer-Reviewed Original ResearchMeSH KeywordsAgedAntibodies, AntinuclearAntibodies, BlockingAutoantibodiesAutoimmune DiseasesCalciumDrug ResistanceExtracellular Signal-Regulated MAP KinasesFemaleGlucocorticoidsHumansHypercalcemiaImmunoglobulin EImmunoprecipitationInositol PhosphatesParathyroid HormonePhosphorylationReceptors, Calcium-SensingStimulation, ChemicalType C PhospholipasesConceptsAutoimmune hypocalciuric hypercalcemiaUrinary calcium excretionCalcium-sensing receptorGlucocorticoid therapyGlucocorticoid treatmentPTH levelsCalcium excretionAutoantibody titersAccumulation of inositol-1-phosphateTrial of glucocorticoid therapyHypocalciuric hypercalcemiaEffect of extracellular Ca(2Regulation of PTH secretionSerum PTH levelsElevated PTH levelsInositol-1-phosphate accumulationPTH-mediated hypercalcemiaIonized calcium concentrationAntibody-mediated inhibitionExtracellular Ca(2PTH secretionBlocking autoantibodiesAutoimmune disordersSerum totalHypercalcemia
2002
Cyclic-adenosine 3′,5′-monophosphate-stimulated c-fos gene transcription involves distinct calcium pathways in single β-cells
Schöfl C, Waring M, Bergwitz C, Arseniev L, von zur Mühlen A, Brabant G. Cyclic-adenosine 3′,5′-monophosphate-stimulated c-fos gene transcription involves distinct calcium pathways in single β-cells. Molecular And Cellular Endocrinology 2002, 186: 121-131. PMID: 11850128, DOI: 10.1016/s0303-7207(01)00609-8.Peer-Reviewed Original ResearchConceptsSerum response elementCa(2+)-influxC-fos gene transcriptionC-fos promoterCAMP response elementC-fosBeta-cellsModes of Ca(2+) entryGene transcriptionCa(2+) entryCa(2+C-fos mRNA expressionCa(2+) signalingForskolin-induced riseCa(2+)-free mediumForskolin-induced increaseCytosolic free calciumActivation of c-fos transcriptionCa(2+)-dependent pathwaysSingle B cellsCa(2+)-mediated mechanismsBeta-cell activityC-fos promoter activityC-fos transcriptionEffect of cAMP
2001
Familial isolated parathyroid adenoma in a consanguineous family
Bergwitz C, Bremer B, Soudah B, Mayr B, Brabant G. Familial isolated parathyroid adenoma in a consanguineous family. Journal Of Endocrinological Investigation 2001, 24: 349-355. PMID: 11407655, DOI: 10.1007/bf03343872.Peer-Reviewed Original ResearchConceptsPrimary hyperparathyroidismSecond-degree relativesParathyroid adenomaMultiple endocrine neoplasia 1Recessive mode of inheritanceLeft lower neckRecurrent parathyroid adenomaGood healthGenetic testingSigns or symptomsGerm-cell mutationsBilateral hearing lossPre-term childrenSternocleidomastoid muscleSymptomatic hypercalcemiaMode of inheritanceOncocytic differentiationParathyroid massGentamicin treatmentGerm cell mutationsUltrasound scanRare formLower neckSubsequent autotransplantationEndocrine studies