2022
Impact of chemotherapy on the ovarian reserve: Are all primordial follicles created equal?
Oktay K, Marin L, Titus S. Impact of chemotherapy on the ovarian reserve: Are all primordial follicles created equal? Fertility And Sterility 2022, 117: 396-398. PMID: 34998576, DOI: 10.1016/j.fertnstert.2021.12.007.Peer-Reviewed Original Research
2021
Comparison of open and a novel closed vitrification system with slow freezing for human ovarian tissue cryopreservation
Sugishita Y, Taylan E, Kawahara T, Shahmurzada B, Suzuki N, Oktay K. Comparison of open and a novel closed vitrification system with slow freezing for human ovarian tissue cryopreservation. Journal Of Assisted Reproduction And Genetics 2021, 38: 2723-2733. PMID: 34398400, PMCID: PMC8581089, DOI: 10.1007/s10815-021-02297-9.Peer-Reviewed Original ResearchConceptsFollicle survivalCortical piecesPrimary folliclesHuman ovarian tissue cryopreservationOvarian tissue cryopreservationCell death pathway activationOvarian cortical piecesPrimordial follicle survivalPrimordial follicle densityHuman ovarian tissueClosed vitrification systemTissue cryopreservationDNA damageOvarian tissueHistological analysisPathway activationApoptosis rateDevice groupSlow freezingIndividual-oocyte transcriptomic analysis shows that genotoxic chemotherapy depletes human primordial follicle reserve in vivo by triggering proapoptotic pathways without growth activation
Titus S, Szymanska K, Musul B, Turan V, Taylan E, Garcia- Milian R, Mehta S, Oktay K. Individual-oocyte transcriptomic analysis shows that genotoxic chemotherapy depletes human primordial follicle reserve in vivo by triggering proapoptotic pathways without growth activation. Scientific Reports 2021, 11: 407. PMID: 33431979, PMCID: PMC7801500, DOI: 10.1038/s41598-020-79643-x.Peer-Reviewed Original ResearchMeSH KeywordsAdultAnimalsAntineoplastic Combined Chemotherapy ProtocolsApoptosisCyclophosphamideDNA DamageFemaleGene Expression ProfilingHeterograftsHumansMiceMice, Inbred NODMice, SCIDOocytesOogenesisOvarian FollicleOvarian ReserveOvarySignal TransductionSingle-Cell AnalysisTranscriptomeYoung AdultConceptsPrimordial follicle oocytesFollicle lossGrowth activationHuman ovarian xenograft modelPI3K/PTEN/AktFollicle oocytesDNA damagePI3K/PTEN/Akt pathwayOvarian reserve depletionPrimordial follicle reservePTEN/AKT pathwayIngenuity Pathway AnalysisOvarian xenograft modelPTEN/AKTSevere DNA damageExpression of AktGonadotoxic chemotherapyAnti-apoptotic Bcl2Early menopauseFollicle reserveTranscriptomic analysisCyclophosphamide injectionHuman ovaryPhosphorylation statusRNA sequencing
2020
Unraveling the mechanisms of chemotherapy-induced damage to human primordial follicle reserve: road to developing therapeutics for fertility preservation and reversing ovarian aging
Szymanska K, Tan X, Oktay K. Unraveling the mechanisms of chemotherapy-induced damage to human primordial follicle reserve: road to developing therapeutics for fertility preservation and reversing ovarian aging. Molecular Human Reproduction 2020, 26: 553-566. PMID: 32514568, PMCID: PMC7411370, DOI: 10.1093/molehr/gaaa043.Peer-Reviewed Original ResearchMeSH KeywordsAntineoplastic AgentsApoptosisDNA DamageFemaleFertility PreservationHumansOvarian FollicleOvarian ReserveOvaryConceptsPrimordial follicle reserveChemotherapy-induced damageFollicle reserveOvarian reserveChemotherapy-induced lossOvarian reserve depletionApoptotic deathPrimordial follicle oocytesFertility preservationAcute reductionOvarian agingHuman ovaryFollicle activationPrimordial folliclesAcute exposureStromal damageTranslational evidenceChemotherapeutic agentsApoptotic lossFollicle oocytesDNA double-strand breaksDNA DSBsCurrent literatureDeathActivation
2019
BRCA-related ATM-mediated DNA double-strand break repair and ovarian aging
Turan V, Oktay K. BRCA-related ATM-mediated DNA double-strand break repair and ovarian aging. Human Reproduction Update 2019, 26: 43-57. PMID: 31822904, PMCID: PMC6935693, DOI: 10.1093/humupd/dmz043.Peer-Reviewed Original Research
2001
A technique for laparoscopic transplantation of frozen-banked ovarian tissue
Oktay K, Aydin B, Karlikaya G. A technique for laparoscopic transplantation of frozen-banked ovarian tissue. Fertility And Sterility 2001, 75: 1212-1216. PMID: 11384651, DOI: 10.1016/s0015-0282(01)01776-9.Peer-Reviewed Original ResearchConceptsFrozen-banked ovarian tissueLaparoscopic transplantationOvarian tissueAcademic medical centerSlow-freezing techniqueMenopausal gonadotropinOvarian stimulationSpontaneous mensesOvarian fossaPelvic peritoneumOvarian functionLaparoscopic techniqueOvarian cortexMedical CenterMAIN OUTCOMEMicrosurgical reconstructionProgesterone productionBlood flowFollicle developmentTransplantationPatientsTissueMensesGonadotropinTransplant
2000
Interaction of Extracellular Matrix and Activin-A in the Initiation of Follicle Growth in the Mouse Ovary1
Oktay K, Karlikaya G, Akman O, Ojakian G, Oktay M. Interaction of Extracellular Matrix and Activin-A in the Initiation of Follicle Growth in the Mouse Ovary1. Biology Of Reproduction 2000, 63: 457-461. PMID: 10906050, DOI: 10.1095/biolreprod63.2.457.Peer-Reviewed Original ResearchConceptsFollicle growth initiationFollicle developmentFollicle growthFollicle growth rateFollicle densityRecombinant human activinEarly follicle developmentEarly follicular developmentRole of activinAbsence of activinTotal folliclesFollicular growthExtracellular matrixFollicular developmentTreatment groupsMultilayer folliclesMouse ovariesActivin treatmentHuman activinPresence of lamininActivinExtracellular matrix componentsPrecise mechanismMiceFolliclesThe re-incarnation of an old question— clomid effect on oocyte and embryo?
Oktay K, Berkowitz P, Berkus M, Schenken R, Brzyski R. The re-incarnation of an old question— clomid effect on oocyte and embryo? Fertility And Sterility 2000, 74: 422. PMID: 10970170, DOI: 10.1016/s0015-0282(00)00663-4.Peer-Reviewed Original ResearchTransplantation of cryopreserved human ovarian tissue results in follicle growth initiation in SCID mice
Oktay K, Newton H, Gosden R. Transplantation of cryopreserved human ovarian tissue results in follicle growth initiation in SCID mice. Fertility And Sterility 2000, 73: 599-603. PMID: 10689020, DOI: 10.1016/s0015-0282(99)00548-8.Peer-Reviewed Original ResearchMeSH KeywordsAdultAnimalsCryopreservationFemaleHumansMiceMice, SCIDOvarian FollicleOvaryTransplantation, HeterologousConceptsOvarian tissueSCID miceFrozen-thawed human ovarian tissueFrozen-thawed ovarian tissueAutologous ovarian transplantationFrozen-thawed graftsHuman ovarian tissueFollicle growth initiationLong-term survivalWeeks of graftingHuman primordial folliclesFollicle countOvarian transplantationImmunodeficiency miceMAIN OUTCOMEHealthy folliclesPrimordial folliclesAcademic centersAnimal studiesFollicle stageAdvanced folliclesFolliclesGraftMiceNecrotic cells
1998
Development of human primordial follicles to antral stages in SCID/hpg mice stimulated with follicle stimulating hormone.
Oktay K, Newton H, Mullan J, Gosden R. Development of human primordial follicles to antral stages in SCID/hpg mice stimulated with follicle stimulating hormone. Human Reproduction 1998, 13: 1133-1138. PMID: 9647533, DOI: 10.1093/humrep/13.5.1133.Peer-Reviewed Original ResearchConceptsWeeks of graftingSevere combined immunodeficiencyFollicle growthOvarian xenograftsAntral stageOestradiol levelsLong-term graftHuman ovarian xenograftsHuman follicle developmentHuman ovarian tissueOvarian follicular growthPreantral follicle growthLong-term graftingGranulosa cell layerHuman primordial folliclesCell nuclear antigenFSH administrationHpg miceKidney capsuleGonadotrophin stimulationRenal capsuleHuman ovaryImmunodeficient miceFollicular growthSmall follicles
1997
Ontogeny of Follicle-Stimulating Hormone Receptor Gene Expression in Isolated Human Ovarian Follicles
Oktay K. Ontogeny of Follicle-Stimulating Hormone Receptor Gene Expression in Isolated Human Ovarian Follicles. The Journal Of Clinical Endocrinology & Metabolism 1997, 82: 3748-3751. DOI: 10.1210/jc.82.11.3748.Peer-Reviewed Original ResearchOntogeny of Follicle-Stimulating Hormone Receptor Gene Expression in Isolated Human Ovarian Follicles1
Oktay K, Briggs D, Gosden R. Ontogeny of Follicle-Stimulating Hormone Receptor Gene Expression in Isolated Human Ovarian Follicles1. The Journal Of Clinical Endocrinology & Metabolism 1997, 82: 3748-3751. PMID: 9360535, DOI: 10.1210/jcem.82.11.4346.Peer-Reviewed Original ResearchConceptsMessenger ribonucleic acidPrimordial folliclesFollicle stageElective cesarean sectionHuman ovarian folliclesPreantral follicle developmentFSH receptor geneHormone receptor gene expressionReceptor gene expressionFollicle-stimulating hormone receptor gene expressionCesarean sectionRectus muscleHuman ovaryAntral folliclesFollicular growthFSH expressionHuman folliculogenesisOvarian folliclesOvarian tissueGranulosa cellsMultilaminar folliclesStromal tissueSingle follicleFollicle developmentFolliclesIsolation and characterization of primordial follicles from fresh and cryopreserved human ovarian tissue
Oktay K, Nugent D, Newton H, Salha O, Chatterjee P, Gosden R. Isolation and characterization of primordial follicles from fresh and cryopreserved human ovarian tissue. Fertility And Sterility 1997, 67: 481-486. PMID: 9091334, DOI: 10.1016/s0015-0282(97)80073-8.Peer-Reviewed Original ResearchConceptsHuman ovarian tissuePrimordial folliclesOvarian tissueWhole folliclesElective cesarean sectionLeeds General InfirmaryCryopreserved ovarian tissueHuman primordial folliclesCesarean sectionHealthy womenOvarian biopsyFollicle countingGeneral InfirmaryMAIN OUTCOMEFollicle viabilityUltrastructural signsFrozen-thawed groupFolliclesFresh groupTissuePropidium iodideSuccinimidyl esterViability ratePercent viabilityOocytes
1995
Proliferating Cell Nuclear Antigen Marks the Initiation of Follicular Growth in the Rat1
Oktay K, Schenken R, Nelson J. Proliferating Cell Nuclear Antigen Marks the Initiation of Follicular Growth in the Rat1. Biology Of Reproduction 1995, 53: 295-301. PMID: 7492681, DOI: 10.1095/biolreprod53.2.295.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsFemaleGranulosa CellsImmunohistochemistryOocytesOvarian FollicleProliferating Cell Nuclear AntigenRatsTheca CellsConceptsPCNA expressionPrimary folliclesFollicle growthCell nuclear antigenAntral folliclesFollicular growthPCNA immunoreactivityGranulosa cellsNuclear antigenEarly primary folliclesGranulosa cell layerTransitional folliclesControl ratsAdult ratsPrimordial folliclesSensitive markerPCNA stainingAtretic folliclesRat ovaryOocyte enlargementProliferating Cell Nuclear AntigenEarly signsFolliclesParaffin sectionsPregranulosa cells