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  1. Article ; Online: Neurological outcome following delayed traction and fixation in severe tetraparesis consecutive to posterior decompression for Chiari malformation: a case report.

    Vigneul, Eric / Del Gaudio, Nicole / de Nijs, Loïc / Raftopoulos, Christian

    Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery

    2024  

    Abstract: Background: Chiari malformation type 1 (CM1) is a congenital hindbrain malformation characterized by herniation of the cerebellar tonsils below the foramen magnum. The term Chiari type 1.5 is used when herniation of the brainstem under the McRae line ... ...

    Abstract Background: Chiari malformation type 1 (CM1) is a congenital hindbrain malformation characterized by herniation of the cerebellar tonsils below the foramen magnum. The term Chiari type 1.5 is used when herniation of the brainstem under the McRae line and anomalies of the craniovertebral junction are also present. These conditions are associated with several symptoms and signs, including headache, neck pain, and spinal cord syndrome. For symptomatic patients, surgical decompression is recommended. When radiographic indicators of craniovertebral junction (CVJ) instability or symptoms related to ventral brainstem compression are present, CVJ fixation should also be considered.
    Case description: We report the case of a 13-year-old girl who presented with severe tetraparesis after posterior decompression for Chiari malformation type 1.5, followed 5 days later by partial C2 laminectomy. Several months after the initial surgery, she underwent two fixations, first without and then with intraoperative cervical traction, leading to significant neurological improvement.
    Discussion and conclusion: This case report underscores the importance of meticulous radiological analysis before CM surgery. For CM 1.5 patients with basilar invagination, CVJ fixation is recommended, and C2 laminectomy should be avoided. In the event of significant clinical deterioration due to nonadherence to these guidelines, our findings highlight the importance of traction with increased extension before fixation, even years after initial destabilizing surgery.
    Language English
    Publishing date 2024-02-19
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 605988-0
    ISSN 1433-0350 ; 0302-2803 ; 0256-7040
    ISSN (online) 1433-0350
    ISSN 0302-2803 ; 0256-7040
    DOI 10.1007/s00381-024-06327-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Modified Vertical Parasagittal Sub-Insular Hemispherotomy-Case Series and Technical Note.

    Del Gaudio, Nicole / Ferrao Santos, Susana / Raftopoulos, Christian

    Brain sciences

    2023  Volume 13, Issue 10

    Abstract: 1) Background: Hemispherotomy is the generally accepted treatment for hemispheric drug-resistant epilepsy (DRE). Lateral or vertical approaches are performed according to the surgeon's preference. Multiple technical variations have been proposed since ... ...

    Abstract (1) Background: Hemispherotomy is the generally accepted treatment for hemispheric drug-resistant epilepsy (DRE). Lateral or vertical approaches are performed according to the surgeon's preference. Multiple technical variations have been proposed since Delalande first described his vertical technique. We propose a sub-insular variation of the vertical parasagittal hemispherotomy (VPH) and describe our case series of patients operated on using this procedure. (2) Methods: Data from a continuous series of patients with hemispheric DRE who were operated on by the senior author (CR) using the modified sub-insular VPH technique were analyzed retrospectively. Pre-operative demographic and epilepsy characteristics, functional outcome, and surgical complications were extracted from medical charts. (3) Results: Twenty-five patients were operated on between August 2008 and August 2023; 23 have at least 3 months of follow-up. Of this group, 20 (86.9%) patients are seizure-free. Only two patients developed postoperative hydrocephalus (8.7%). All patients who were able to walk autonomously preoperatively and 20 (86.9%) of those with follow-up were able to walk without assistance. A total of 17 (74%) patients were able to perform adapted social activities at the latest follow-up. (4) Conclusions: Modified sub-insular VPH is a successful surgical technique for hemispheric DRE with seizure freedom rates similar to the largest series reported in the literature. Compared to other series, patients who were operated on with our modified technique had a lower rate of postoperative hydrocephalus and excellent long-term motor and cognitive outcomes.
    Language English
    Publishing date 2023-09-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2651993-8
    ISSN 2076-3425
    ISSN 2076-3425
    DOI 10.3390/brainsci13101395
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  3. Article: A mouse model to study glutathione limitation

    Timson, Rebecca C / Khan, Artem / Uygur, Beste / Saad, Marwa / Yeh, Hsi-Wen / DelGaudio, Nicole / Weber, Ross / Alwaseem, Hanan / Gao, Jing / Yang, Chingwen / Birsoy, Kıvanç

    bioRxiv : the preprint server for biology

    2024  

    Abstract: Glutathione (GSH) is a highly abundant tripeptide thiol that performs diverse protective and biosynthetic functions in cells. While changes in GSH availability are linked to many diseases, including cancer and neurodegenerative disorders, determining the ...

    Abstract Glutathione (GSH) is a highly abundant tripeptide thiol that performs diverse protective and biosynthetic functions in cells. While changes in GSH availability are linked to many diseases, including cancer and neurodegenerative disorders, determining the function of GSH in physiology and disease has been challenging due to its tight regulation. To address this, we generated cell and mouse models that express a bifunctional glutathione-synthesizing enzyme from
    Language English
    Publishing date 2024-01-09
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2024.01.08.574722
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Development of a mouse model expressing a bifunctional glutathione-synthesizing enzyme to study glutathione limitation in vivo.

    Timson, Rebecca C / Khan, Artem / Uygur, Beste / Saad, Marwa / Yeh, Hsi-Wen / DelGaudio, Nicole L / Weber, Ross / Alwaseem, Hanan / Gao, Jing / Yang, Chingwen / Birsoy, Kıvanç

    The Journal of biological chemistry

    2024  Volume 300, Issue 2, Page(s) 105645

    Abstract: Glutathione (GSH) is a highly abundant tripeptide thiol that performs diverse protective and biosynthetic functions in cells. While changes in GSH availability are associated with inborn errors of metabolism, cancer, and neurodegenerative disorders, ... ...

    Abstract Glutathione (GSH) is a highly abundant tripeptide thiol that performs diverse protective and biosynthetic functions in cells. While changes in GSH availability are associated with inborn errors of metabolism, cancer, and neurodegenerative disorders, studying the limiting role of GSH in physiology and disease has been challenging due to its tight regulation. To address this, we generated cell and mouse models that express a bifunctional glutathione-synthesizing enzyme from Streptococcus thermophilus (GshF), which possesses both glutamate-cysteine ligase and glutathione synthase activities. GshF expression allows efficient production of GSH in the cytosol and mitochondria and prevents cell death in response to GSH depletion, but not ferroptosis induction, indicating that GSH is not a limiting factor under lipid peroxidation. CRISPR screens using engineered enzymes further revealed genes required for cell proliferation under cellular and mitochondrial GSH depletion. Among these, we identified the glutamate-cysteine ligase modifier subunit, GCLM, as a requirement for cellular sensitivity to buthionine sulfoximine, a glutathione synthesis inhibitor. Finally, GshF expression in mice is embryonically lethal but sustains postnatal viability when restricted to adulthood. Overall, our work identifies a conditional mouse model to investigate the limiting role of GSH in physiology and disease.
    MeSH term(s) Animals ; Mice ; Buthionine Sulfoximine/pharmacology ; Disease Models, Animal ; Glutamate-Cysteine Ligase/genetics ; Glutamate-Cysteine Ligase/metabolism ; Glutathione/metabolism ; Cell Line, Tumor ; Humans
    Chemical Substances Buthionine Sulfoximine (5072-26-4) ; Glutamate-Cysteine Ligase (EC 6.3.2.2) ; Glutathione (GAN16C9B8O)
    Language English
    Publishing date 2024-01-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1016/j.jbc.2024.105645
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Comparison of Dural Peeling versus Duraplasty for Surgical Treatment of Chiari Type I Malformation: Results and Complications in a Monocentric Patients' Cohort.

    Del Gaudio, Nicole / Vaz, Geraldo / Duprez, Thierry / Raftopoulos, Christian

    World neurosurgery

    2018  Volume 117, Page(s) e595–e602

    Abstract: Objective: Chiari malformation type I is typified by the downward herniation of the cerebellar tonsils through the foramen magnum, which can impede cerebrospinal fluid circulation and may lead to syringomyelia. The usual symptoms of this condition are ... ...

    Abstract Objective: Chiari malformation type I is typified by the downward herniation of the cerebellar tonsils through the foramen magnum, which can impede cerebrospinal fluid circulation and may lead to syringomyelia. The usual symptoms of this condition are neck pain and posterior headaches on Valsalva maneuver. Different surgical procedures have been described for cranio-cervical decompression (CCD), without a consensus being reached about the best suited technique. The primary end point of this study was to compare efficacy and complications rate of CCD using dural peeling (DPe) versus duraplasty (DP). The secondary end point was to find predictive factors of success of DPe.
    Methods: Twenty-eight consecutive patients with Chiari malformation type I (12 women and 16 men) requiring CCD were enrolled at our institution between August 2011 and November 2015. Ten patients (35.7%) underwent DP, and 18 (64.3%) DPe. A standardized magnetic resonance imaging protocol was performed before and at least 3 months after surgery. Symptomatic outcome was evaluated at the last follow-up visit.
    Results: Overall complications were more frequent in the DP (4 patients, 70%) group than in the DPe (none) group (P <0.05). All patients in the DP group improved clinically but only 12 patients (66.7%) in the DPe group (P = 0.1). Morphologic evolution at magnetic resonance imaging was similar in both groups. A moderate trend for changes in cerebellar tonsil conformation was shown in patients with clinical improvement (P = 0.07). Predictive factors of clinical improvement after DPe cannot be identified.
    Conclusions: CCD with DPe was less risky than with DP but had a lower responsive rate (66.7% vs. 100). Larger studies are therefore warranted to assess predictive factors of success of CCD with DPe.
    MeSH term(s) Adolescent ; Adult ; Arnold-Chiari Malformation/diagnostic imaging ; Arnold-Chiari Malformation/surgery ; Child ; Child, Preschool ; Decompression, Surgical ; Dura Mater/diagnostic imaging ; Dura Mater/surgery ; Female ; Follow-Up Studies ; Humans ; Infant ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Postoperative Complications/diagnostic imaging ; Young Adult
    Language English
    Publishing date 2018-06-19
    Publishing country United States
    Document type Comparative Study ; Journal Article
    ZDB-ID 2534351-8
    ISSN 1878-8769 ; 1878-8750
    ISSN (online) 1878-8769
    ISSN 1878-8750
    DOI 10.1016/j.wneu.2018.06.093
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Suppression of epithelial proliferation and tumorigenesis by immunoglobulin A.

    Donaldson, Gregory P / Reis, Gabriella L / Saad, Marwa / Mamede, Izabela / Chen, Guo / DelGaudio, Nicole L / Zhang, Dayu / Aydin, Begüm / Harrer, Caroline E / Castro, Tiago Br / Grivennikov, Sergei / Reis, Bernardo S / Stadtmueller, Beth M / Victora, Gabriel D / Mucida, Daniel

    bioRxiv : the preprint server for biology

    2023  

    Abstract: Immunoglobulin A (IgA) is the most abundant antibody isotype produced across mammals and plays a specialized role in mucosal ... ...

    Abstract Immunoglobulin A (IgA) is the most abundant antibody isotype produced across mammals and plays a specialized role in mucosal homeostasis
    Language English
    Publishing date 2023-10-10
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.10.06.561290
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: A JAK2/IDH1-mutant MPN clone unmasked by ivosidenib in an AML patient without antecedent MPN.

    Xiao, Wenbin / Miles, Linde A / Bowman, Robert L / Durani, Vidushi / Tian, Helen S / DelGaudio, Nicole L / Mishra, Tanmay / Zhu, Menglei / Zhang, Yanming / Stump, Sarah E / Tallman, Martin S / Levine, Ross L / Cai, Sheng F

    Blood advances

    2020  Volume 4, Issue 23, Page(s) 6034–6038

    MeSH term(s) Clone Cells ; Glycine/analogs & derivatives ; Humans ; Isocitrate Dehydrogenase ; Janus Kinase 2/genetics ; Leukemia, Myeloid, Acute/drug therapy ; Leukemia, Myeloid, Acute/genetics ; Pyridines
    Chemical Substances Pyridines ; Isocitrate Dehydrogenase (EC 1.1.1.41) ; IDH1 protein, human (EC 1.1.1.42.) ; JAK2 protein, human (EC 2.7.10.2) ; Janus Kinase 2 (EC 2.7.10.2) ; ivosidenib (Q2PCN8MAM6) ; Glycine (TE7660XO1C)
    Language English
    Publishing date 2020-12-07
    Publishing country United States
    Document type Case Reports ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2915908-8
    ISSN 2473-9537 ; 2473-9529
    ISSN (online) 2473-9537
    ISSN 2473-9529
    DOI 10.1182/bloodadvances.2020003326
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  8. Article ; Online: Genomics analysis of hexanoic acid exposure in Drosophila species.

    Drum, Zachary A / Lanno, Stephen M / Gregory, Sara M / Shimshak, Serena J / Ahamed, Mukshud / Barr, Will / Bekele, Bethlehem / Biester, Alison / Castro, Colleen / Connolly, Lauren / DelGaudio, Nicole / Humphrey, William / Karimi, Helen / Karolczak, Sophie / Lawrence, Tay-Shaun / McCracken, Andrew / Miller-Medzon, Noah / Murphy, Leah / Park, Cameron /
    Park, Sojeong / Qiu, Chloe / Serra, Kevin / Snyder, Gigi / Strauss, Alexa / Tang, Spencer / Vyzas, Christina / Coolon, Joseph D

    G3 (Bethesda, Md.)

    2021  Volume 12, Issue 1

    Abstract: Drosophila sechellia is a dietary specialist endemic to the Seychelles islands that has evolved to consume the fruit of Morinda citrifolia. When ripe, the fruit of M. citrifolia contains octanoic acid and hexanoic acid, two medium-chain fatty acid ... ...

    Abstract Drosophila sechellia is a dietary specialist endemic to the Seychelles islands that has evolved to consume the fruit of Morinda citrifolia. When ripe, the fruit of M. citrifolia contains octanoic acid and hexanoic acid, two medium-chain fatty acid volatiles that deter and are toxic to generalist insects. Drosophila sechellia has evolved resistance to these volatiles allowing it to feed almost exclusively on this host plant. The genetic basis of octanoic acid resistance has been the focus of multiple recent studies, but the mechanisms that govern hexanoic acid resistance in D. sechellia remain unknown. To understand how D. sechellia has evolved to specialize on M. citrifolia fruit and avoid the toxic effects of hexanoic acid, we exposed adult D. sechellia, D. melanogaster and D. simulans to hexanoic acid and performed RNA sequencing comparing their transcriptional responses to identify D. sechellia specific responses. Our analysis identified many more genes responding transcriptionally to hexanoic acid in the susceptible generalist species than in the specialist D. sechellia. Interrogation of the sets of differentially expressed genes showed that generalists regulated the expression of many genes involved in metabolism and detoxification whereas the specialist primarily downregulated genes involved in the innate immunity. Using these data, we have identified interesting candidate genes that may be critically important in aspects of adaptation to their food source that contains high concentrations of HA. Understanding how gene expression evolves during dietary specialization is crucial for our understanding of how ecological communities are built and how evolution shapes trophic interactions.
    MeSH term(s) Animals ; Caproates/metabolism ; Caproates/toxicity ; Drosophila/physiology ; Drosophila melanogaster/genetics ; Genomics ; Species Specificity
    Chemical Substances Caproates ; hexanoic acid (1F8SN134MX)
    Language English
    Publishing date 2021-10-30
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2629978-1
    ISSN 2160-1836 ; 2160-1836
    ISSN (online) 2160-1836
    ISSN 2160-1836
    DOI 10.1093/g3journal/jkab354
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  9. Article ; Online: Plasmacytoid dendritic cell expansion defines a distinct subset of RUNX1-mutated acute myeloid leukemia.

    Xiao, Wenbin / Chan, Alexander / Waarts, Michael R / Mishra, Tanmay / Liu, Ying / Cai, Sheng F / Yao, Jinjuan / Gao, Qi / Bowman, Robert L / Koche, Richard P / Csete, Isabelle S / DelGaudio, Nicole L / Derkach, Andriy / Baik, Jeeyeon / Yanis, Sophia / Famulare, Christopher A / Patel, Minal / Arcila, Maria E / Stahl, Maximilian /
    Rampal, Raajit K / Tallman, Martin S / Zhang, Yanming / Dogan, Ahmet / Goldberg, Aaron D / Roshal, Mikhail / Levine, Ross L

    Blood

    2020  Volume 137, Issue 10, Page(s) 1377–1391

    Abstract: Plasmacytoid dendritic cells (pDCs) are the principal natural type I interferon-producing dendritic cells. Neoplastic expansion of pDCs and pDC precursors leads to blastic plasmacytoid dendritic cell neoplasm (BPDCN), and clonal expansion of mature pDCs ... ...

    Abstract Plasmacytoid dendritic cells (pDCs) are the principal natural type I interferon-producing dendritic cells. Neoplastic expansion of pDCs and pDC precursors leads to blastic plasmacytoid dendritic cell neoplasm (BPDCN), and clonal expansion of mature pDCs has been described in chronic myelomonocytic leukemia. The role of pDC expansion in acute myeloid leukemia (AML) is poorly studied. Here, we characterize patients with AML with pDC expansion (pDC-AML), which we observe in ∼5% of AML cases. pDC-AMLs often possess cross-lineage antigen expression and have adverse risk stratification with poor outcome. RUNX1 mutations are the most common somatic alterations in pDC-AML (>70%) and are much more common than in AML without pDC expansion and BPDCN. We demonstrate that pDCs are clonally related to, as well as originate from, leukemic blasts in pDC-AML. We further demonstrate that leukemic blasts from RUNX1-mutated AML upregulate a pDC transcriptional program, poising the cells toward pDC differentiation and expansion. Finally, tagraxofusp, a targeted therapy directed to CD123, reduces leukemic burden and eliminates pDCs in a patient-derived xenograft model. In conclusion, pDC-AML is characterized by a high frequency of RUNX1 mutations and increased expression of a pDC transcriptional program. CD123 targeting represents a potential treatment approach for pDC-AML.
    MeSH term(s) Adult ; Aged ; Blast Crisis/genetics ; Blast Crisis/pathology ; Core Binding Factor Alpha 2 Subunit/genetics ; Dendritic Cells/metabolism ; Dendritic Cells/pathology ; Female ; Humans ; Leukemia, Myeloid, Acute/genetics ; Leukemia, Myeloid, Acute/pathology ; Male ; Middle Aged ; Mutation
    Chemical Substances Core Binding Factor Alpha 2 Subunit ; RUNX1 protein, human
    Language English
    Publishing date 2020-08-01
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80069-7
    ISSN 1528-0020 ; 0006-4971
    ISSN (online) 1528-0020
    ISSN 0006-4971
    DOI 10.1182/blood.2020007897
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  10. Article ; Online: Leukemia Cell of Origin Influences Apoptotic Priming and Sensitivity to LSD1 Inhibition.

    Cai, Sheng F / Chu, S Haihua / Goldberg, Aaron D / Parvin, Salma / Koche, Richard P / Glass, Jacob L / Stein, Eytan M / Tallman, Martin S / Sen, Filiz / Famulare, Christopher A / Cusan, Monica / Huang, Chun-Hao / Chen, Chun-Wei / Zou, Lihua / Cordner, Keith B / DelGaudio, Nicole L / Durani, Vidushi / Kini, Mitali / Rex, Madison /
    Tian, Helen S / Zuber, Johannes / Baslan, Timour / Lowe, Scott W / Rienhoff, Hugh Y / Letai, Anthony / Levine, Ross L / Armstrong, Scott A

    Cancer discovery

    2020  Volume 10, Issue 10, Page(s) 1500–1513

    Abstract: The cell of origin of oncogenic transformation is a determinant of therapeutic sensitivity, but the mechanisms governing cell-of-origin-driven differences in therapeutic response have not been delineated. Leukemias initiating in hematopoietic stem cells ( ...

    Abstract The cell of origin of oncogenic transformation is a determinant of therapeutic sensitivity, but the mechanisms governing cell-of-origin-driven differences in therapeutic response have not been delineated. Leukemias initiating in hematopoietic stem cells (HSC) are less sensitive to chemotherapy and highly express the transcription factor
    MeSH term(s) Apoptosis ; Gene Expression Regulation, Leukemic/genetics ; Histone Demethylases/antagonists & inhibitors ; Humans ; Leukemia/physiopathology ; Transcription Factors
    Chemical Substances Transcription Factors ; Histone Demethylases (EC 1.14.11.-) ; KDM1A protein, human (EC 1.5.-)
    Language English
    Publishing date 2020-06-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2625242-9
    ISSN 2159-8290 ; 2159-8274
    ISSN (online) 2159-8290
    ISSN 2159-8274
    DOI 10.1158/2159-8290.CD-19-1469
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