2023
Circulating Levels of Leptin and Lipocalin-2 in Patients With X-Linked Hypophosphatemia
Simpson C, Santoro A, Carpenter T, Deng Y, Parziale S, Insogna K. Circulating Levels of Leptin and Lipocalin-2 in Patients With X-Linked Hypophosphatemia. Journal Of The Endocrine Society 2023, 7: bvad116. PMID: 37860221, PMCID: PMC10583534, DOI: 10.1210/jendso/bvad116.Peer-Reviewed Original ResearchLipocalin-2Control subjectsGreater riskLevels of LCN2Excessive weight gainLevels of leptinSerum leptin levelsCirculating LevelsLCN2 levelsSerum levelsYear age cohortLeptin levelsMetabolic abnormalitiesRetrospective studyAge cohortsInsulin sensitivityHigh prevalencePatientsWeight gainXLHLeptinAge 2HypophosphatemiaObesityChildrenA De Novo Deleterious PHEX Variant Without Clinical Features of X-Linked Hypophosphatemia
Kayser M, Jain P, Bale A, Carpenter T. A De Novo Deleterious PHEX Variant Without Clinical Features of X-Linked Hypophosphatemia. JCEM Case Reports 2023, 1: luad082. PMID: 37908207, PMCID: PMC10586592, DOI: 10.1210/jcemcr/luad082.Peer-Reviewed Original ResearchSkewed X-inactivationFibroblast growth factor 23Growth factor 23Intrauterine growth restrictionSingle nucleotide polymorphismsDiagnosis of XLHClinical featuresFactor 23Duodenal atresiaRadiographic featuresGrowth restrictionPostnatal genetic testingAndrogen receptor locusPotential treatmentGenetic testingHypophosphatemiaXLHHereditary ricketsDominant disorderPrenatal identificationCommon formHemizygous malesHeterozygous disruptionRicketsHeterozygous females
2019
Sustained efficacy and safety of burosumab, a fully human anti-FGF23 monoclonal antibody, in children and early adolescents with X-linked hypophosphatemia
Hogler W, Carpenter T, Imel E, Portale A, Boot A, Linglart A, Padidela R, Hoff W, Mao M, Skrinar A, Martin J, Whyte M. Sustained efficacy and safety of burosumab, a fully human anti-FGF23 monoclonal antibody, in children and early adolescents with X-linked hypophosphatemia. Bone Abstracts 2019 DOI: 10.1530/boneabs.7.oc15.Peer-Reviewed Original Research011–X-Linked Hypophosphatemia (XLH): New Knowledge for Nurses Regarding Genetics, Pathophysiology and Clinical Presentation
Couto I, Hart M, Olear E, Imel E, Carpenter T. 011–X-Linked Hypophosphatemia (XLH): New Knowledge for Nurses Regarding Genetics, Pathophysiology and Clinical Presentation. Journal Of Pediatric Nursing 2019, 46: 131. DOI: 10.1016/j.pedn.2019.02.018.Peer-Reviewed Original Research
2018
A Phase 3 randomized, double-blind, placebo-controlled study investigating the efficacy and safety of Burosumab, an anti-FGF23 antibody, in adult X-Linked Hypophosphatemia (XLH)
Kamenicky P, Lachmann R, Carpenter T, Cohen-Solal M, Eastell R, Brandi M, Crowley R, Ralston S, Javaid M, Keen R, Briot K, Il C, Imanishi Y, Ito N, Tanaka H, Zhang L, Theodore-Oklota C, Mealiffe M, Martin J, Insogna K. A Phase 3 randomized, double-blind, placebo-controlled study investigating the efficacy and safety of Burosumab, an anti-FGF23 antibody, in adult X-Linked Hypophosphatemia (XLH). Endocrine Abstracts 2018 DOI: 10.1530/endoabs.56.oc3.1.Peer-Reviewed Original Research
2017
KRN23 effects on phosphate and vitamin D dysregulation in children <5 years old with X-Linked Hypophosphatemia (XLH)
Imel E, Carpenter T, Gottesman G, Martin J, Mao M, Skrinar A, Whyte M. KRN23 effects on phosphate and vitamin D dysregulation in children <5 years old with X-Linked Hypophosphatemia (XLH). Bone Abstracts 2017 DOI: 10.1530/boneabs.6.oc24.Peer-Reviewed Original ResearchVitamin D dysregulationHypophosphatemiaUnexpected widespread hypophosphatemia and bone disease associated with elemental formula use in infants and children
Ballesteros L, S. N, Gordon RJ, Ward L, Backeljauw P, Wasserman H, Weber DR, DiMeglio LA, Gagne J, Stein R, Cody D, Simmons K, Zimakas P, Topor LS, Agrawal S, Calabria A, Tebben P, Faircloth R, Imel EA, Casey L, Carpenter TO. Unexpected widespread hypophosphatemia and bone disease associated with elemental formula use in infants and children. Bone 2017, 97: 287-292. PMID: 28167344, PMCID: PMC5884631, DOI: 10.1016/j.bone.2017.02.003.Peer-Reviewed Original ResearchConceptsElemental formula useFormula useSkeletal diseaseRetrospective chart reviewInadequate dietary intakeCertain clinical settingsFormula productsEffect of treatmentSevere malabsorptionChart reviewSevere hypocalcemiaClinical featuresClinical profileRenal excretionDietary intakeCommon findingMineral metabolismBone diseaseHypophosphatemiaPhosphate supplementationSkeletal radiographsCareful monitoringComplex illnessRenal conservationClinical setting
2016
Hypophosphatemia promotes lower rates of muscle ATP synthesis
Pesta DH, Tsirigotis DN, Befroy DE, Caballero D, Jurczak MJ, Rahimi Y, Cline GW, Dufour S, Birkenfeld AL, Rothman DL, Carpenter TO, Insogna K, Petersen KF, Bergwitz C, Shulman GI. Hypophosphatemia promotes lower rates of muscle ATP synthesis. The FASEB Journal 2016, 30: 3378-3387. PMID: 27338702, PMCID: PMC5024687, DOI: 10.1096/fj.201600473r.Peer-Reviewed Original ResearchConceptsMuscle ATP synthesisATP synthesisMuscle weaknessIsolated muscle mitochondriaSolute carrier familyWild-type littermate controlsSolute carrier family 34Carrier familyLower ratesInsulin-stimulated ratesMuscle mitochondriaChronic hypophosphatemiaHeart failureHypophosphatemic groupHypophosphatemic miceHypophosphatemiaLittermate controlsKnockout miceBlood PLow ratePlasma PPatientsSimilar findingsMember 1Plasma inorganic phosphateAn Unusual Case of Rickets and How Whole Exome Sequencing Helped to Correct a Diagnosis
Peter P, Brownstein C, Yao G, Olear E, Simpson C, Agrawal P, Carpenter T, Insogna K. An Unusual Case of Rickets and How Whole Exome Sequencing Helped to Correct a Diagnosis. AACE Clinical Case Reports 2016, 2: ee278-ee283. DOI: 10.4158/ep15944.cr.Peer-Reviewed Original ResearchWhole-exome sequencingForms of ricketsExome sequencingGrowth factor 23Classic clinical featuresClinical suspicionClinical featuresClinical presentationFactor 23Parathyroid hormoneDihydroxyvitamin D3Correct diagnosisMistaken diagnosisUnusual caseNutritional deficienciesRicketsPatientsDiagnosisDiseaseHypophosphatemiaGenetic defectsCompound heterozygotesCYP27B1Gene sequencing technologyXLH
2015
Contemporary Medical and Surgical Management of X-linked Hypophosphatemic Rickets
Sharkey MS, Grunseich K, Carpenter TO. Contemporary Medical and Surgical Management of X-linked Hypophosphatemic Rickets. Journal Of The American Academy Of Orthopaedic Surgeons 2015, 23: 433-442. PMID: 26040953, DOI: 10.5435/jaaos-d-14-00082.Peer-Reviewed Original ResearchConceptsBony deformityProgressive bony deformityCornerstone of treatmentCareful surgical planningOrthopedic surgical proceduresMedical therapyMedical managementSurgical managementGradual correctionSurgical techniqueDeformity correctionSurgical proceduresBone deformitiesHypophosphatemic ricketsMedical treatmentRenal phosphateHypophosphatemiaContemporary medicalBone pathologySuccessful correctionSurgical planningDeformityInheritable disorderTreatmentAdults
2014
A randomized, double-blind, placebo-controlled, ascending, single-dose study of a human monoclonal anti-FGF23 antibody (KRN23) in X-linked hypophosphatemia
Carpenter T, Imel E, Ruppe M, Weber T, Klausner M, Wooddell M, Kawakami T, Ito T, Zhang X, Humphrey J, Insogna K, Peacock M. A randomized, double-blind, placebo-controlled, ascending, single-dose study of a human monoclonal anti-FGF23 antibody (KRN23) in X-linked hypophosphatemia. Bone Abstracts 2014 DOI: 10.1530/boneabs.3.pp90.Peer-Reviewed Original ResearchPharmacokinetics and pharmacodynamics of a human monoclonal anti-FGF23 antibody (KRN23) after ascending single-dose administration in patients with X-linked hypophosphatemia
Zhang X, Carpenter T, Imel E, Ruppe M, Weber T, Klausner M, Kawakami T, Ito T, Humphrey J, Insogna K, Peacock M. Pharmacokinetics and pharmacodynamics of a human monoclonal anti-FGF23 antibody (KRN23) after ascending single-dose administration in patients with X-linked hypophosphatemia. Bone Abstracts 2014 DOI: 10.1530/boneabs.3.pp91.Peer-Reviewed Original Research
2013
Exome sequencing reveals FAM20c mutations associated with fibroblast growth factor 23–related hypophosphatemia, dental anomalies, and ectopic calcification
Rafaelsen SH, Ræder H, Fagerheim AK, Knappskog P, Carpenter TO, Johansson S, Bjerknes R. Exome sequencing reveals FAM20c mutations associated with fibroblast growth factor 23–related hypophosphatemia, dental anomalies, and ectopic calcification. Journal Of Bone And Mineral Research 2013, 28: 1378-1385. PMID: 23325605, DOI: 10.1002/jbmr.1850.Peer-Reviewed Original ResearchConceptsFibroblast growth factor 23Growth factor 23Factor 23Dental anomaliesExome sequencingAbsence of ricketsFAM20C mutationsCompound heterozygous mutationsWhole-exome sequencingIntracerebral calcificationsFGF23 levelsFamilial hypophosphatemiaHypophosphatemic ricketsEctopic calcificationHypophosphatemiaPutative new mechanismsType 1Heterozygous mutationsUndiagnosed probandsLong bonesNorwegian populationCausal roleHuman subjectsSequence similarity 20Rickets
2011
A clinician's guide to X‐linked hypophosphatemia
Carpenter TO, Imel EA, Holm IA, de Beur S, Insogna KL. A clinician's guide to X‐linked hypophosphatemia. Journal Of Bone And Mineral Research 2011, 26: 1381-1388. PMID: 21538511, PMCID: PMC3157040, DOI: 10.1002/jbmr.340.BooksConceptsTreatment guidelinesRenal phosphate wastingPathophysiologic featuresPrototypic disorderPhosphate wastingClinician's GuideMissed diagnosisSupport groupsConference recommendationsCommon formComplex disorderDearth of informationHypophosphatemiaDisordersGuidelinesPatientsScientific conferencesRicketsCliniciansDiseasePhysiciansDiagnosisWasting
2010
Circulating Levels of Soluble Klotho and FGF23 in X-Linked Hypophosphatemia: Circadian Variance, Effects of Treatment, and Relationship to Parathyroid Status
Carpenter TO, Insogna KL, Zhang JH, Ellis B, Nieman S, Simpson C, Olear E, Gundberg CM. Circulating Levels of Soluble Klotho and FGF23 in X-Linked Hypophosphatemia: Circadian Variance, Effects of Treatment, and Relationship to Parathyroid Status. The Journal Of Clinical Endocrinology & Metabolism 2010, 95: e352-e357. PMID: 20685863, PMCID: PMC2968736, DOI: 10.1210/jc.2010-0589.Peer-Reviewed Original ResearchMeSH KeywordsAdolescentAdultAge FactorsAgedBone Density Conservation AgentsCalcitriolChildCircadian RhythmEnzyme-Linked Immunosorbent AssayFamilial Hypophosphatemic RicketsFemaleFibroblast Growth Factor-23Fibroblast Growth FactorsGenetic Diseases, X-LinkedGlucuronidaseHumansKlotho ProteinsMaleMiddle AgedParathyroid HormonePhosphatesVitamin DConceptsSerum KlothoSerum FGF23Higher klotho levelsHospital research unitRenal phosphate handlingAcademic medical centerEffect of treatmentFibroblast growth factorKlotho levelsPTH secretionMedical therapySoluble KlothoDihydroxyvitamin DFGF23 regulationPhosphate handlingMedical CenterFGF23KlothoXLHCircadian variationGrowth factorPTHAdultsHypophosphatemiaTherapy
2009
Survey of the Enthesopathy of X-Linked Hypophosphatemia and Its Characterization in Hyp Mice
Liang G, Katz LD, Insogna KL, Carpenter TO, Macica CM. Survey of the Enthesopathy of X-Linked Hypophosphatemia and Its Characterization in Hyp Mice. Calcified Tissue International 2009, 85: 235-246. PMID: 19609735, PMCID: PMC2988401, DOI: 10.1007/s00223-009-9270-6.Peer-Reviewed Original ResearchMeSH KeywordsAchilles TendonAdolescentAdultAgedAnimalsBiomarkersCalcinosisChildDisease Models, AnimalDisease ProgressionFamilial Hypophosphatemic RicketsFemaleFibroblast Growth Factor-23Fibroblast Growth FactorsGenetic Diseases, X-LinkedHumansMiceMice, Inbred C57BLMiddle AgedPatellar LigamentPhenotypeQuadriceps MuscleRadiographyRheumatic DiseasesTendinopathyTendonsYoung AdultConceptsFGF-23Fibroblast growth factor receptor 3Hyp miceMajority of patientsHigh circulating levelsPhosphate-regulating hormoneBone spur formationTendon insertion siteGrowth factor receptor 3Insertion siteLigament insertion sitesCirculating LevelsPhosphate excretionBone-forming osteoblastsHeterotopic calcificationOsteophyte formationHistological examinationMurine modelReceptor 3Spur formationHypophosphatemiaEnthesis fibrocartilageBone mineralizationBiochemical milieuMice
2005
Hypophosphatemia leads to rickets by impairing caspase-mediated apoptosis of hypertrophic chondrocytes
Sabbagh Y, Carpenter TO, Demay MB. Hypophosphatemia leads to rickets by impairing caspase-mediated apoptosis of hypertrophic chondrocytes. Proceedings Of The National Academy Of Sciences Of The United States Of America 2005, 102: 9637-9642. PMID: 15976027, PMCID: PMC1172249, DOI: 10.1073/pnas.0502249102.Peer-Reviewed Original ResearchConceptsParathyroid hormone levelsMineral ion homeostasisRachitic changesHormone levelsAbnormal mineral ion homeostasisDihydroxyvitamin D levelsVitamin D deficiencyDegree of hypophosphatemiaHypertrophic chondrocyte layerVitamin D receptorHypertrophic chondrocytesNormal phosphorus levelsGrowth plate maturationD deficiencyD levelsNormal calciumD receptorChondrocyte layerHypophosphatemiaVDR actionChondrocyte apoptosisNull miceRicketsCaspase-mediated apoptosisHypercalcemia
2003
Chapter 25 Familial Hypophosphatemia and Related Disorders
Holm I, Econs M, Carpenter T. Chapter 25 Familial Hypophosphatemia and Related Disorders. 2003, 603-xvi. DOI: 10.1016/b978-012286551-0/50027-0.Peer-Reviewed Original ResearchAutosomal dominant hypophosphatemic ricketsTumor-induced osteomalaciaRelated disordersHypophosphatemic ricketsPathophysiology of XLHDevelopment of ricketsDegenerative joint diseaseHereditary hypophosphatemic ricketsCommon bone diseaseJoint painDental abscessClinical featuresDihydroxyvitamin DFamilial hypophosphatemiaHypophosphatemic diseasesDental diseaseJoint diseaseBone diseaseRenal phosphateEndopeptidase PHEXShort statureHypophosphatemiaXLHDiseaseRickets
1999
Evaluation and Treatment of Heritable Forms of Rickets
Levine B, Carpenter T. Evaluation and Treatment of Heritable Forms of Rickets. The Endocrinologist 1999, 9: 358-365. DOI: 10.1097/00019616-199909000-00006.Peer-Reviewed Original ResearchHereditary ricketsOverall treatment strategySpecific therapeutic guidelinesTherapeutic guidelinesPrimary derangementRadiographic featuresTreatment strategiesCorrect diagnosisSkeletal diseaseRicketsRachitic diseaseHeritable formDiseaseChildrenDisorder resultsHypophosphatemiaMajor formDerangementDiagnosis
1989
Hypercalciuric hypophosphatemic rickets, mineral balance, bone histomorphometry, and therapeutic implications of hypercalciuria.
Chen C, Carpenter T, Steg N, Baron R, Anast C. Hypercalciuric hypophosphatemic rickets, mineral balance, bone histomorphometry, and therapeutic implications of hypercalciuria. Pediatrics 1989, 84: 276-80. PMID: 2787497, DOI: 10.1542/peds.84.2.276.Peer-Reviewed Original ResearchConceptsYears of ageHypophosphatemic ricketsDihydroxyvitamin DVitamin DHigh-dose vitamin DUrinary phosphorus excretionUrinary calcium excretionNormal serum calciumParathyroid hormone concentrationsPhosphorus therapyCalcium excretionSymptomatic nephrolithiasisAppropriate therapySerum calciumAlkaline phosphatase activitySevere ricketsBone histomorphometryHormone concentrationsIntestinal absorptionTherapeutic implicationsCardinal featuresRicketsModest dosageHypercalciuriaHypophosphatemia