2024
Both enantiomers of β-aminoisobutyric acid BAIBA regulate Fgf23 via MRGPRD receptor by activating distinct signaling pathways in osteocytes
Sakamoto E, Kitase Y, Fitt A, Zhu Z, Awad K, Brotto M, White K, Welc S, Bergwitz C, Bonewald L. Both enantiomers of β-aminoisobutyric acid BAIBA regulate Fgf23 via MRGPRD receptor by activating distinct signaling pathways in osteocytes. Cell Reports 2024, 43: 114397. PMID: 38935499, PMCID: PMC11350516, DOI: 10.1016/j.celrep.2024.114397.Peer-Reviewed Original ResearchActivate distinct signaling pathwaysSignaling pathwayFibroblast growth factor 23Urinary phosphate excretionReceptor type DInduce FGF23Urine phosphateElevated FGF23Phosphate excretionFGF23L-BAIBAExercise-induced increasePhosphate homeostasisSclerostinPhosphate metabolismReceptorsD-enantiomerBonePathway
2021
Phosphorus bioaccessibility measured in four amino acid–based formulas using in-vitro batch digestion translates well into phosphorus bioavailability in mice
Chande S, Dijk F, Fetene J, Yannicelli S, Carpenter TO, van Helvoort A, Bergwitz C. Phosphorus bioaccessibility measured in four amino acid–based formulas using in-vitro batch digestion translates well into phosphorus bioavailability in mice. Nutrition 2021, 89: 111291. PMID: 34111672, PMCID: PMC8588148, DOI: 10.1016/j.nut.2021.111291.Peer-Reviewed Original ResearchConceptsPhosphorus bioavailabilityAmino acid-based formulaProton pump inhibitorsDigestion modelBioavailability analysisPlasma phosphorus levelsLow phosphorus dietDigestion conditionsBioaccessibilityBioavailabilityStomach acidificationDigestive conditionsIntact fibroblast growth factor 23Phosphorus dietFibroblast growth factor 23Stomach pH.Intact parathyroid hormoneAcid-suppressive medicationsDihydroxy vitamin DGrowth factor 23Phosphorus levelsPhosphorus bioaccessibilityAcidificationPhosphorusIntact fibroblast growth factorFGF23 signalling and physiology.
Ho BB, Bergwitz C. FGF23 signalling and physiology. Journal Of Molecular Endocrinology 2021, 66: r23-r32. PMID: 33338030, PMCID: PMC8782161, DOI: 10.1530/jme-20-0178.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsO-glycosylation of FGF23FGF23 signalingSubtilisin-like proprotein convertase furinSuppressing phosphate reabsorptionProprotein convertase furinPost-translationallyO-glycosylationIntact FGF23C-terminusGenetic activityPrevent proteolysisParacrine FGFsHigh-affinity binding sitesFibroblast growth factor 23Fruit flyActive intact FGF23Convertase furinChronic kidney diseaseFGF23 fragmentsGrowth factor 23Physiological roleEndocrine FGFsDihydroxyvitamin D synthesisHyperphosphatemic disordersIntestinal phosphate absorption
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
2018
Hereditary hypophosphatemic rickets with hypercalciuria: pathophysiology, clinical presentation, diagnosis and therapy
Bergwitz C, Miyamoto KI. Hereditary hypophosphatemic rickets with hypercalciuria: pathophysiology, clinical presentation, diagnosis and therapy. Pflügers Archiv - European Journal Of Physiology 2018, 471: 149-163. PMID: 30109410, DOI: 10.1007/s00424-018-2184-2.ChaptersConceptsElevated 1,25(OH)2D levelsHereditary hypophosphatemic ricketsHypophosphatemic ricketsActive vitamin D analoguesEnhanced intestinal calcium absorptionActive vitamin D analogsFibroblast growth factor 23Kidney stonesRare autosomal recessive disorderIntestinal calcium absorptionGrowth factor 23Risk of kidney stonesUrinary phosphate wastingDistal renal tubulesVitamin D analogsX-linked hypophosphatemiaAutosomal recessive disorderDevelopment of kidney stonesLoss-of-function mutationsSecondary hyperparathyroidismClinical presentationFactor 23Parathyroid hormoneBone lossCalcium absorption
2012
FGF23 and Syndromes of Abnormal Renal Phosphate Handling
Bergwitz C, Jüppner H. FGF23 and Syndromes of Abnormal Renal Phosphate Handling. Advances In Experimental Medicine And Biology 2012, 728: 41-64. PMID: 22396161, PMCID: PMC5234086, DOI: 10.1007/978-1-4614-0887-1_3.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsLoss-of-function mutationsParathyroid hormoneAutosomal dominant hypophosphatemic ricketsDentin matrix protein 1Ecto-nucleotide pyrophosphatase/phosphodiesterase 1O-glycosylation of FGF23Hypophosphatemic ricketsAbnormal renal phosphate handlingImpaired O-glycosylationFibroblast growth factor 23Hormonal bone-parathyroid-kidney axisGrowth factor 23Serum phosphate levelsRenal phosphate excretionRenal phosphate handlingFamilial hyperphosphatemic tumoral calcinosisSodium-phosphate cotransporters NaPi-IIaHereditary hypophosphatemic ricketsHyperphosphatemic tumoral calcinosisIncreased serum phosphate levelsFunction mutationsPhosphate-regulating geneRare genetic disorderCotransporter NaPi-IIaDominant hypophosphatemic rickets
2010
Regulation of Phosphate Homeostasis by PTH, Vitamin D, and FGF23
Bergwitz C, Jüppner H. Regulation of Phosphate Homeostasis by PTH, Vitamin D, and FGF23. Annual Review Of Medicine 2010, 61: 91-104. PMID: 20059333, PMCID: PMC4777331, DOI: 10.1146/annurev.med.051308.111339.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsParathyroid hormoneDentin matrix protein 1Regulation of phosphate homeostasisVitamin DPhosphate homeostasisFibroblast growth factor 23Serum phosphorus levelsGrowth factor 23Renal phosphate excretionSecretion of FGF23Secretion of parathyroid hormoneSodium-phosphate cotransporters NaPi-IIaCotransporter NaPi-IIaIncreases renal phosphate excretionGenetically engineered miceRegulation of calcium homeostasisHomologies to endopeptidasesKidney axisMatrix protein 1Sodium-phosphate cotransporter NaPi-IIaFactor 23Serum phosphorusPhosphate excretionParathyroid glandsHormonal bone-parathyroid-kidney axis
2009
Disorders of Phosphate Homeostasis and Tissue Mineralisation
Bergwitz C, Jüppner H. Disorders of Phosphate Homeostasis and Tissue Mineralisation. Endocrine Development 2009, 16: 133-156. PMID: 19494665, PMCID: PMC3810012, DOI: 10.1159/000223693.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsDisorders of phosphate homeostasisPhosphate homeostasisFibroblast growth factor 23Secretion of parathyroid hormoneAbnormal phosphate homeostasisDentin matrix protein 1Tissue mineralizationGrowth factor 23Co-receptor KlothoBone-kidney axisReabsorption of phosphateExpression of FGF23Renal proximal tubulesHomologies to endopeptidasesMatrix protein 1Phosphate-regulating geneCirculating phosphate concentrationClinical presentationFactor 23Parathyroid hormoneUDP-N-acetyl-alpha-D-galactosamineParathyroid glandsDiagnostic evaluationProximal tubulesD-galactosamine