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1.
Actas urol. esp ; 41(6): 391-399, jul.-ago. 2017. tab, graf
Article in Spanish | IBECS | ID: ibc-164455

ABSTRACT

Objetivos: Conocer el estado actual de la actividad médico-quirúrgica y de la formación de los residentes de urología en España. Material y método: Se diseñaron 2 encuestas anónimas y fueron cargadas en la herramienta Google Docs© para ser contestadas vía online. El periodo de recolección online fue de septiembre de 2015-enero de 2016. Los datos recolectados fueron procesados utilizando el programa estadístico IBM SPSS para Windows, Versión 21.0 y el programa R versión 3.2.3. Resultados: El número de total de respondedores fue de 163. En referencia al número de guardias de presencia física la mayoría de los residentes realizan entre 4 y 6 guardias al mes. Ochenta y cuatro de los encuestados refieren estar menos de 20 horas semanales en quirófano y 43 de estos incluso menos de 10 horas. El 30% de los encuestados no ha realizado ninguna resección transuretral, la mayoría ha realizado al menos una adenomectomía prostática, pero a su vez no ha realizado ningún procedimiento oncológico mayor, ya sea por vía laparoscópica o abierta. En las preguntas destinadas a entrenamiento y cursos de formación encontramos que la mayoría de los residentes entrena laparoscopia en el hospital o en casa. La satisfacción global de la residencia fue valorada en 2,6. En este sentido podría considerarse la satisfacción global como moderada. Conclusiones: Se deberían orientar esfuerzos para estandarizar la adquisición de habilidades quirúrgicas y no quirúrgicas, garantizar el acceso a cursos de formación, establecer un mínimo de intervenciones requeridas por año y lograr una evaluación objetiva de la especialidad


Objectives: To determine the actual state of medical-surgical activity and training for urology residents in Spain. Material and method: We designed 2 anonymous surveys, which were uploaded with the Google Docs© tool so that the respondents could answer the surveys online. The online collection period was September 2015 to January 2016. The collected data were processing using the statistical programme IBM SPSS for Windows, Version 21.0 and the programme R version 3.2.3. Results: The total number of responders was 163. In reference to the number of physically present on-call residents, the majority conducted between 4 and 6 shifts a month. Eighty-four of those surveyed indicated that they were in the operating room less than 20hours a week, and 43 of these even less than 10hours. Thirty percent of those surveyed had not performed any transurethral resection. The majority had performed at least one prostatic adenomectomy, but had not performed any major oncologic procedure, either laparoscopically or openly. In the questions concerning training and training courses, we found that most of the residents trained in laparoscopy at the hospital or at home. The overall satisfaction for the residence was assessed at 2.6. Based on this score, the overall satisfaction could be considered moderate. Conclusions: Efforts should be directed towards standardising the acquisition of surgical and nonsurgical skills, ensuring access to training courses, establishing a minimum of required operations per year and achieving an objective assessment of the specialty


Subject(s)
Humans , Urology/education , Internship and Residency/trends , Urologic Surgical Procedures/education , Surveys and Questionnaires , Education, Medical/trends , Educational Measurement
2.
Actas Urol Esp ; 41(6): 391-399, 2017.
Article in English, Spanish | MEDLINE | ID: mdl-28336202

ABSTRACT

OBJECTIVES: To determine the actual state of medical-surgical activity and training for urology residents in Spain. MATERIAL AND METHOD: We designed 2 anonymous surveys, which were uploaded with the Google Docs© tool so that the respondents could answer the surveys online. The online collection period was September 2015 to January 2016. The collected data were processing using the statistical programme IBM SPSS for Windows, Version 21.0 and the programme R version 3.2.3. RESULTS: The total number of responders was 163. In reference to the number of physically present on-call residents, the majority conducted between 4 and 6 shifts a month. Eighty-four of those surveyed indicated that they were in the operating room less than 20hours a week, and 43 of these even less than 10hours. Thirty percent of those surveyed had not performed any transurethral resection. The majority had performed at least one prostatic adenomectomy, but had not performed any major oncologic procedure, either laparoscopically or openly. In the questions concerning training and training courses, we found that most of the residents trained in laparoscopy at the hospital or at home. The overall satisfaction for the residence was assessed at 2.6. Based on this score, the overall satisfaction could be considered moderate. CONCLUSIONS: Efforts should be directed towards standardising the acquisition of surgical and nonsurgical skills, ensuring access to training courses, establishing a minimum of required operations per year and achieving an objective assessment of the specialty.


Subject(s)
Internship and Residency , Self Report , Urologic Surgical Procedures/education , Urology/education , Spain
3.
Actas urol. esp ; 40(3): 148-154, abr. 2016. tab, graf
Article in Spanish | IBECS | ID: ibc-150985

ABSTRACT

Objetivo: Describir la evolución de la técnica quirúrgica para el manejo de las masas renales en un centro español e identificar los factores asociados con la decisión de nefrectomía parcial (NP). Materiales y métodos: Un total de 646 pacientes fueron tratados quirúrgicamente por tumores renales localizados entre enero de 2004 y diciembre de 2012. Las técnicas quirúrgicas incluyeron la nefrectomía radical (NR) abierta, NP abierta, NR laparoscópica y NP laparoscópica. Se compararon las características basales y las proporciones de los pacientes tratados por diferentes técnicas mediante estadísticos descriptivos y se determinaron las tendencias anuales en la proporción de procedimientos realizados. Se calculó la proporción de probabilidades (OR) y los intervalos de confianza del 95% para evaluar variables clínicas predictivas de NP. Resultados: Durante el período de 9 años, la proporción de NP aumentó respecto a la NR, pasando del 21 al 55%. Los procedimientos abiertos disminuyeron gradualmente a favor de abordajes mínimamente invasivos (83% en 2004; 4% en 2011-2012). Aunque el tamaño tumoral medio no cambió significativamente durante el período de estudio, la NP laparoscópica se convirtió en el procedimiento más realizado en 2011-2012 (un 49% de todos los procedimientos). Las variables clínicas independientemente predictivas de NP fueron puntuación ASA, función renal basal y tamaño tumoral (todas las p < 0,05). Conclusiones: En nuestra institución, la evolución en el manejo de las masas renales ha establecido la NP como la opción quirúrgica más frecuente. Aunque la NP se utilizó cada vez más durante el período de estudio, se observó un aumento paralelo de los abordajes mínimamente invasivos tanto para NR como para NP


Objective: To describe the temporal trends in surgical techniques for the management of renal masses at a single Spanish academic institution and identify factors associated with partial nephrectomy (PN) decision. Materials and methods: A total of 646 patients were treated by surgery for clinically localised renal masses from January 2004 to December 2012 at a tertiary referral center. Surgical techniques included open radical nephrectomy (RN), open PN, laparoscopic RN, and laparoscopic PN. Descriptive statistics were used to compare baseline characteristics and proportions of patients treated by different surgical techniques. Annual trends in the proportion of procedures performed were determined. Adjusted odds ratios (OR) and 95% confidence intervals were calculated to evaluate clinical variables predictive of PN. Results: During the 9-year study period, the proportion of PN relative to RN increased from 21% to 55%. With regard to surgical approach, open procedures for both RN and PN decreased gradually in favor of minimally invasive approaches (83% in 2004 to 4% in 2011-2012). While median tumor size did not significantly change over the study period, laparoscopic PN became the most commonly performed kidney procedure in 2011-2012 (49% of all procedures). Clinical variables independently predictive of partial nephrectomy were ASA score, baseline renal function and tumor size (all P < .05). Conclusions: At our academic institution, temporal trends in the management of renal masses have established PN as the most common surgical option. Although PN was increasingly used over the study period, a parallel increase in minimally invasive approaches for RN and PN was seen


Subject(s)
Humans , Male , Middle Aged , Female , Aged , Nephrectomy/methods , Practice Patterns, Physicians' , Kidney Neoplasms/surgery , Laparoscopy , Confidence Intervals , Glomerular Filtration Rate/physiology
4.
Leukemia ; 30(5): 1133-42, 2016 05.
Article in English | MEDLINE | ID: mdl-26710888

ABSTRACT

DNA methyltransferase 3A (DNMT3A) mutations are observed in myeloid malignancies, including myeloproliferative neoplasms (MPN), myelodysplastic syndromes (MDS) and acute myeloid leukemia (AML). Transplantation studies have elucidated an important role for Dnmt3a in stem cell self-renewal and in myeloid differentiation. Here, we investigated the impact of conditional hematopoietic Dnmt3a loss on disease phenotype in primary mice. Mx1-Cre-mediated Dnmt3a ablation led to the development of a lethal, fully penetrant MPN with myelodysplasia (MDS/MPN) characterized by peripheral cytopenias and by marked, progressive hepatomegaly. We detected expanded stem/progenitor populations in the liver of Dnmt3a-ablated mice. The MDS/MPN induced by Dnmt3a ablation was transplantable, including the marked hepatomegaly. Homing studies showed that Dnmt3a-deleted bone marrow cells preferentially migrated to the liver. Gene expression and DNA methylation analyses of progenitor cell populations identified differential regulation of hematopoietic regulatory pathways, including fetal liver hematopoiesis transcriptional programs. These data demonstrate that Dnmt3a ablation in the hematopoietic system leads to myeloid transformation in vivo, with cell-autonomous aberrant tissue tropism and marked extramedullary hematopoiesis (EMH) with liver involvement. Hence, in addition to the established role of Dnmt3a in regulating self-renewal, Dnmt3a regulates tissue tropism and limits myeloid progenitor expansion in vivo.


Subject(s)
DNA (Cytosine-5-)-Methyltransferases/physiology , Hematopoietic Stem Cells/cytology , Myeloid Cells/cytology , Animals , Bone Marrow Cells , Cell Movement , Cell Proliferation , Cell Self Renewal , DNA Methyltransferase 3A , Hematopoiesis , Liver/pathology , Mice
5.
Actas Urol Esp ; 40(3): 148-54, 2016 Apr.
Article in English, Spanish | MEDLINE | ID: mdl-26687094

ABSTRACT

OBJECTIVE: To describe the temporal trends in surgical techniques for the management of renal masses at a single Spanish academic institution and identify factors associated with partial nephrectomy (PN) decision. MATERIALS AND METHODS: A total of 646 patients were treated by surgery for clinically localised renal masses from January 2004 to December 2012 at a tertiary referral center. Surgical techniques included open radical nephrectomy (RN), open PN, laparoscopic RN, and laparoscopic PN. Descriptive statistics were used to compare baseline characteristics and proportions of patients treated by different surgical techniques. Annual trends in the proportion of procedures performed were determined. Adjusted odds ratios (OR) and 95% confidence intervals were calculated to evaluate clinical variables predictive of PN. RESULTS: During the 9-year study period, the proportion of PN relative to RN increased from 21% to 55%. With regard to surgical approach, open procedures for both RN and PN decreased gradually in favor of minimally invasive approaches (83% in 2004 to 4% in 2011-2012). While median tumor size did not significantly change over the study period, laparoscopic PN became the most commonly performed kidney procedure in 2011-2012 (49% of all procedures). Clinical variables independently predictive of partial nephrectomy were ASA score, baseline renal function and tumor size (all P<.05). CONCLUSIONS: At our academic institution, temporal trends in the management of renal masses have established PN as the most common surgical option. Although PN was increasingly used over the study period, a parallel increase in minimally invasive approaches for RN and PN was seen.


Subject(s)
Kidney Neoplasms/surgery , Nephrectomy , Practice Patterns, Physicians' , Aged , Female , Humans , Male , Middle Aged , Nephrectomy/methods
6.
Leukemia ; 29(6): 1290-300, 2015 Jun.
Article in English | MEDLINE | ID: mdl-25650089

ABSTRACT

PTPN11 encodes the Shp2 non-receptor protein-tyrosine phosphatase implicated in several signaling pathways. Activating mutations in Shp2 are commonly associated with juvenile myelomonocytic leukemia but are not as well defined in other neoplasms. Here we report that Shp2 mutations occur in human acute myeloid leukemia (AML) at a rate of 6.6% (6/91) in the ECOG E1900 data set. We examined the role of mutated Shp2 in leukemias harboring MLL translocations, which co-occur in human AML. The hyperactive Shp2E76K mutant, commonly observed in leukemia patients, significantly accelerated MLL-AF9-mediated leukemogenesis in vivo. Shp2E76K increased leukemic stem cell frequency and affords MLL-AF9 leukemic cells IL3 cytokine hypersensitivity. As Shp2 is reported to regulate anti-apoptotic genes, we investigated Bcl2, Bcl-xL and Mcl1 expression in MLL-AF9 leukemic cells with and without Shp2E76K. Although the Bcl2 family of genes was upregulated in Shp2E76K cells, Mcl1 showed the highest upregulation in MLL-AF9 cells in response to Shp2E76K. Indeed, expression of Mcl1 in MLL-AF9 cells phenocopies expression of Shp2E76K, suggesting Shp2 mutations cooperate through activation of anti-apoptotic genes. Finally, we show Shp2E76K mutations reduce sensitivity of AML cells to small-molecule-mediated Mcl1 inhibition, suggesting reduced efficacy of drugs targeting MCL1 in patients with hyperactive Shp2.


Subject(s)
Drug Resistance, Neoplasm/genetics , Interleukin-3/pharmacology , Leukemia, Myeloid, Acute/drug therapy , Mutation/genetics , Myeloid Cell Leukemia Sequence 1 Protein/antagonists & inhibitors , Neoplastic Stem Cells/pathology , Protein Tyrosine Phosphatase, Non-Receptor Type 11/genetics , Animals , Apoptosis , Apoptosis Regulatory Proteins , Blotting, Western , Cell Proliferation , Clinical Trials, Phase III as Topic , Female , Humans , Leukemia, Myeloid, Acute/genetics , Leukemia, Myeloid, Acute/pathology , Mice , Mice, Inbred C57BL , Myeloid Cell Leukemia Sequence 1 Protein/genetics , Myeloid Cell Leukemia Sequence 1 Protein/metabolism , Neoplastic Stem Cells/drug effects , Oncogene Proteins, Fusion/genetics , Oncogene Proteins, Fusion/metabolism , RNA, Messenger/genetics , RNA, Small Interfering/genetics , Real-Time Polymerase Chain Reaction , Reverse Transcriptase Polymerase Chain Reaction , Tumor Cells, Cultured
7.
Oncogene ; 34(9): 1073-82, 2015 Feb 26.
Article in English | MEDLINE | ID: mdl-24662818

ABSTRACT

Inappropriate expression or activation of transcription factors can drive patterns of gene expression, leading to the malignant behavior of breast cancer cells. We have found that the transcriptional repressor BCL6 is highly expressed in breast cancer cell lines, and its locus is amplified in about half of primary breast cancers. To understand how BCL6 regulates gene expression in breast cancer cells, we used chromatin immunoprecipitation followed by deep sequencing to identify the BCL6 binding sites on a genomic scale. This revealed that BCL6 regulates a unique cohort of genes in breast cancer cell lines compared with B-cell lymphomas. Furthermore, BCL6 expression promotes the survival of breast cancer cells, and targeting BCL6 with a peptidomimetic inhibitor leads to apoptosis of these cells. Finally, combining a BCL6 inhibitor and a signal transducer and activator of transcription3 inhibitor provided enhanced cell killing in triple-negative breast cancer cell lines, suggesting that combination therapy may be particularly useful. Thus, targeting BCL6 alone or in conjunction with other signaling pathways may be a useful therapeutic strategy for treating breast cancer.


Subject(s)
DNA-Binding Proteins/antagonists & inhibitors , DNA-Binding Proteins/genetics , Gene Amplification , Peptidomimetics/pharmacology , Triple Negative Breast Neoplasms/genetics , Triple Negative Breast Neoplasms/pathology , Binding Sites , Cell Line, Tumor , Cell Survival/drug effects , Chromatin Immunoprecipitation , DNA-Binding Proteins/metabolism , Drug Synergism , Female , High-Throughput Nucleotide Sequencing , Humans , MCF-7 Cells , Molecular Targeted Therapy , Proto-Oncogene Proteins c-bcl-6 , Pyrrolidines/pharmacology , RNA, Small Interfering/pharmacology , Signal Transduction/drug effects , Sulfonamides/pharmacology , Triple Negative Breast Neoplasms/drug therapy
8.
Oncogene ; 34(10): 1231-40, 2015 Mar 05.
Article in English | MEDLINE | ID: mdl-24681958

ABSTRACT

Sex determining region Y-box 11 (SOX11) expression is specific for mantle cell lymphoma (MCL) as compared with other non-Hodgkin's lymphomas. However, the function and direct-binding targets of SOX11 in MCL are largely unknown. We used high-resolution chromatin immunoprecipitation sequencing to identify the direct target genes of SOX11 in a genome-wide, unbiased manner and elucidate its functional significance. Pathway analysis identified WNT, PKA and TGF-beta signaling pathways as significantly enriched by SOX11-target genes. Quantitative chromatin immunoprecipitation sequencing and promoter reporter assays confirmed that SOX11 directly binds to individual genes and modulates their transcription activities in these pathways in MCL. Functional studies using RNA interference demonstrate that SOX11 directly regulates WNT in MCL. We analyzed SOX11 expression in three independent well-annotated tissue microarrays from the University of Wisconsin (UW), Karolinska Institute and British Columbia Cancer Agency. Our findings suggest that high SOX11 expression is associated with improved survival in a subset of MCL patients, particularly those treated with intensive chemotherapy. Transcriptional regulation of WNT and other biological pathways affected by SOX11-target genes may help explain the impact of SOX11 expression on patient outcomes.


Subject(s)
Lymphoma, Mantle-Cell/genetics , Lymphoma, Mantle-Cell/metabolism , SOXC Transcription Factors/metabolism , Antineoplastic Combined Chemotherapy Protocols , Binding Sites , Cell Cycle Checkpoints , Cell Line, Tumor , Cell Proliferation , Cell Survival/drug effects , Chromatin Immunoprecipitation , Gene Expression , Gene Expression Regulation, Neoplastic , High-Throughput Nucleotide Sequencing , Humans , Lymphoma, Mantle-Cell/drug therapy , Lymphoma, Mantle-Cell/mortality , Nucleotide Motifs , Prognosis , Protein Binding , SOXC Transcription Factors/genetics , Signal Transduction , Transcription, Genetic , Wnt Proteins/metabolism , Wnt Signaling Pathway , beta Catenin/metabolism
10.
Transl Psychiatry ; 3: e218, 2013 Jan 22.
Article in English | MEDLINE | ID: mdl-23340501

ABSTRACT

Early life adversity, including adverse gestational and postpartum maternal environment, is a contributing factor in the development of autism, attention deficit hyperactivity disorder (ADHD), anxiety and depression but little is known about the underlying molecular mechanism. In a model of gestational maternal adversity that leads to innate anxiety, increased stress reactivity and impaired vocal communication in the offspring, we asked if a specific DNA methylation signature is associated with the emergence of the behavioral phenotype. Genome-wide DNA methylation analyses identified 2.3% of CpGs as differentially methylated (that is, differentially methylated sites, DMSs) by the adverse environment in ventral-hippocampal granule cells, neurons that can be linked to the anxiety phenotype. DMSs were typically clustered and these clusters were preferentially located at gene bodies. Although CpGs are typically either highly methylated or unmethylated, DMSs had an intermediate (20-80%) methylation level that may contribute to their sensitivity to environmental adversity. The adverse maternal environment resulted in either hyper or hypomethylation at DMSs. Clusters of DMSs were enriched in genes that encode cell adhesion molecules and neurotransmitter receptors; some of which were also downregulated, indicating multiple functional deficits at the synapse in adversity. Pharmacological and genetic evidence links many of these genes to anxiety.


Subject(s)
Anxiety/genetics , CpG Islands/genetics , DNA Methylation/genetics , Dentate Gyrus/metabolism , Receptor, Serotonin, 5-HT1A/genetics , Animals , Cell Adhesion/genetics , Disease Models, Animal , Epigenesis, Genetic , Female , Male , Mice , Mice, Transgenic , Pregnancy , Prenatal Exposure Delayed Effects/genetics , Vocalization, Animal/physiology
11.
Leukemia ; 27(4): 852-60, 2013 Apr.
Article in English | MEDLINE | ID: mdl-23235717

ABSTRACT

Mixed lineage leukemia (MLL)-fusion proteins can induce acute myeloid leukemias (AMLs) from either hematopoietic stem cells (HSCs) or granulocyte-macrophage progenitors (GMPs), but it remains unclear whether the cell of origin influences the biology of the resultant leukemia. MLL-AF9-transduced single HSCs or GMPs could be continuously replated, but HSC-derived clones were more likely than GMP-derived clones to initiate AML in mice. Leukemia stem cells derived from either HSCs or GMPs had a similar immunophenotype consistent with a maturing myeloid cell (LGMP). Gene expression analyses demonstrated that LGMP inherited gene expression programs from the cell of origin including high-level Evi-1 expression in HSC-derived LGMP. The gene expression signature of LGMP derived from HSCs was enriched in poor prognosis human MLL-rearranged AML in three independent data sets. Moreover, global 5'-mC levels were elevated in HSC-derived leukemias as compared with GMP-derived leukemias. This mirrored a difference seen in 5'-mC between MLL-rearranged human leukemias that are either EVI1 positive or EVI1 negative. Finally, HSC-derived leukemias were more resistant to chemotherapy than GMP-derived leukemias. These data demonstrate that the cell of origin influences the gene expression profile, the epigenetic state and the drug response in AML, and that these differences can account for clinical heterogeneity within a molecularly defined group of leukemias.


Subject(s)
Leukemia, Myeloid, Acute/genetics , Myeloid-Lymphoid Leukemia Protein/genetics , Adult , Animals , Antineoplastic Agents/pharmacology , Cytarabine/pharmacology , Gene Expression Profiling , Histone-Lysine N-Methyltransferase , Humans , Mice , Mice, Inbred C57BL
12.
Leukemia ; 26(5): 893-901, 2012 May.
Article in English | MEDLINE | ID: mdl-22033493

ABSTRACT

Acute myeloid leukemia (AML) is a disease of the elderly. Poor outcomes with standard therapies necessitate novel approaches. Outpatient regimens sufficiently potent and well tolerated to induce remissions and enable continuation therapy may be beneficial. In this phase-1 study, we determined the maximum tolerated dose (MTD) and the efficacy for sequential azacitidine and lenalidomide as remission induction and continuation therapy in elderly, previously untreated patients. We investigated the impact on global DNA methylation and bone marrow cytokines, and sought biological predictors of response. Eighteen patients were enrolled. The MTD was not reached. Median follow-up was 8.2 months (10.3 months for survivors). Common adverse events included fatigue, injection site reactions, constipation, nausea, pruritus and febrile neutropenia. Ten patients responded (56%), and the rate of complete remissions (CRs) or CRs with incomplete recovery of blood counts for evaluable patients was 44% (7/16). The median response duration was 6.2 months. DNA demethylation and changes in bone marrow cytokines were observed; responders had a unique cytokine profile and a trend towards lower methylation levels. Sequential azacitidine and lenalidomide was well tolerated with encouraging clinical and biological activity in previously untreated elderly AML patients. This trial is registered at ClinicalTrials.gov (NCT00890929).


Subject(s)
Antineoplastic Combined Chemotherapy Protocols/therapeutic use , Leukemia, Myeloid, Acute/drug therapy , Aged , Aged, 80 and over , Antineoplastic Combined Chemotherapy Protocols/administration & dosage , Antineoplastic Combined Chemotherapy Protocols/adverse effects , Azacitidine/administration & dosage , Cohort Studies , Cytokines/genetics , Cytokines/metabolism , DNA Methylation , Female , Gene Expression Profiling , Humans , Lenalidomide , Leukemia, Myeloid, Acute/genetics , Male , Maximum Tolerated Dose , Middle Aged , Mutation , Thalidomide/administration & dosage , Thalidomide/analogs & derivatives , Treatment Outcome
13.
Leukemia ; 25(1): 130-4, 2011 Jan.
Article in English | MEDLINE | ID: mdl-21030981

ABSTRACT

Loss of function mutations and deletions encompassing the plant homeodomain finger 6 (PHF6) gene are present in about 20% of T-cell acute lymphoblastic leukemias (ALLs). Here, we report the identification of recurrent mutations in PHF6 in 10/353 adult acute myeloid leukemias (AMLs). Genetic lesions in PHF6 found in AMLs are frameshift and nonsense mutations distributed through the gene or point mutations involving the second plant homeodomain (PHD)-like domain of the protein. As in the case of T-ALL, where PHF6 alterations are found almost exclusively in males, mutations in PHF6 were seven times more prevalent in males than in females with AML. Overall, these results identify PHF6 as a tumor suppressor gene mutated in AML and extend the role of this X-linked tumor suppressor gene in the pathogenesis of hematologic tumors.


Subject(s)
Carrier Proteins/genetics , Leukemia, Myeloid, Acute/genetics , Mutation , Adult , Aged , Animals , Female , Genes, Tumor Suppressor , Hematopoietic Stem Cells/metabolism , Humans , Leukemia, Myeloid, Acute/etiology , Male , Mice , Middle Aged , Myeloid Cells/metabolism , Repressor Proteins , Sex Characteristics
14.
Biochem Soc Trans ; 35(Pt 4): 802-6, 2007 Aug.
Article in English | MEDLINE | ID: mdl-17635152

ABSTRACT

DLBCL (diffuse large B-cell lymphoma) is the most common subtype of non-Hodgkin's lymphoma. Current therapy for patients includes chemotherapy and monoclonal antibodies. Although oncogene-targeted therapy is dramatically successful for patients with certain kinds of leukaemias, there are no such agents yet for DLBCL. One reason for this is that several key oncogenes involved in DLBCL pathogenesis are transcription factors, which are difficult to therapeutically target with small molecules. Recent advances in the structural and functional characterization of DLBCL oncogenes have facilitated design of CPPs (cellpenetrating peptides) with potent inhibitory effects on DLBCL and other aggressive lymphomas. CPPs targeting the Bcl (B-cell lymphoma)-6, Bcl-2, Myc and NF-kappaB (nuclear factor kappaB) oncogenic pathways, among others, could improve efficacy and reduce toxicity of anti-lymphoma therapy. Another barrier towards effective therapy in DLBCL is its profound molecular heterogeneity. Combinatorial administration of oncogene-targeted CPPs based on the molecular profiles of individual patient tumours could allow individualized targeted therapy regimens to be developed.


Subject(s)
Genetic Therapy , Lymphoma, B-Cell/therapy , Peptides/therapeutic use , Protein Sorting Signals/physiology , Protein Transport/physiology , Animals , Gene Targeting , Humans , Lymphoma, B-Cell/genetics , Lymphoma, B-Cell/pathology
15.
Curr Top Microbiol Immunol ; 313: 221-43, 2007.
Article in English | MEDLINE | ID: mdl-17217046

ABSTRACT

A significant barrier to experimental therapeutics is the ability to identify and specifically target oncogenic proteins involved in the molecular pathogenesis of disease. In acute promyelocytic leukemia (APL), aberrant transcription factors and their associated machinery play a central role in mediating the malignant phenotype. The mechanism of action of APL chimeric fusion proteins involves their ability to either self-associate or interact with different partner proteins. Thus, targeting protein-protein interactions could have a significant impact in blocking the activity of APL oncoproteins. As therapeutic targets, the interface between interacting proteins may not always be amenable to highly specific small molecule blockade. In contrast, peptides are well-suited to this purpose and can be reliably delivered when fused to cell-permeable peptide domains. Therapeutic peptides can be designed to directly target APL fusion proteins, their downstream effectors, or other potentially synergistic oncogenic mechanisms of importance in APL blasts. In addition to serving as potential therapeutic agents, such reagents could serve as powerful reagents to dissect the molecular pathogenesis of APL.


Subject(s)
Cell Membrane/physiology , Leukemia, Promyelocytic, Acute/drug therapy , Oncogene Proteins, Fusion/metabolism , Peptides/therapeutic use , Protein Transport/physiology , Amino Acid Motifs , Amino Acid Sequence , Cell Membrane/metabolism , Humans , Molecular Sequence Data , Oncogene Proteins, Fusion/genetics , Peptides/chemical synthesis , Peptides/chemistry , Peptides/metabolism , Signal Transduction/physiology
16.
Leukemia ; 19(7): 1109-17, 2005 Jul.
Article in English | MEDLINE | ID: mdl-15858614

ABSTRACT

Molecular lesions of genes encoding for transcriptional regulatory proteins are common oncogenic events in hematologic malignancies. Transcriptional activation and repression both occur by virtue of the choreographed recruitment of multisubunit cofactor complexes to target gene loci. As a consequence, the three-dimensional structure of the target gene is altered and its potential to support transcription is increased or decreased. The complexity of the transcriptional process offers a rich substrate for designing therapeutic agents. The objective of such 'transcription therapy' is to regain control over cohorts of target genes and restore the normal genetic and epigenetic programming of the cancer cell. The success of all-trans retinoic acid in the treatment of acute promyelocytic leukemia indicates that transcription therapy can be highly effective and safe. A classification scheme of these therapeutic strategies is proposed herein, which allows predictions to be made regarding specificity, efficacy, disease spectrum and side effects. This framework could help facilitate discussion of the mechanisms of action of transcription therapy drugs as well as the design of preclinical and clinical trials in the future.


Subject(s)
Antineoplastic Agents/therapeutic use , Hematologic Neoplasms/drug therapy , Antineoplastic Agents/classification , Decision Support Techniques , Humans , Transcription Factors/drug effects , Transcription, Genetic/drug effects , Treatment Outcome
18.
Neurology ; 58(7): 1031-7, 2002 Apr 09.
Article in English | MEDLINE | ID: mdl-11940688

ABSTRACT

BACKGROUND: The term chorea-acanthocytosis describes a heterogeneous group of neurodegenerative disorders with variable clinical features and modes of inheritance. The characteristic acanthocytic appearance of red blood cells is attributed to abnormalities of a membrane protein, band 3, although the relationship between this and the neurodegenerative process has yet to be determined. OBJECTIVE: To describe features of phenotype, inheritance, and neuropathological findings in a family with this disorder. METHODS: Clinical and hematologic evaluations were performed on all available family members and neuropathological examination was performed on one case. RESULTS: Autosomal dominant inheritance was evident, with variable clinical features of chorea or parkinsonism, marked cognitive changes, but no seizures or peripheral neurologic abnormalities. Abnormalities of band 3 were demonstrated on gel electrophoresis of red blood cell membranes. Neuropathological examination revealed severe neuronal loss of the caudate-putamen and intranuclear inclusion bodies in many areas of the cerebral cortex. These inclusion bodies were immunoreactive for ubiquitin, expanded polyglutamine repeats, and torsinA. CONCLUSIONS: This family extends the genetic spectrum of chorea-acanthocytosis to include autosomal dominant inheritance, possibly due to expanded trinucleotide repeats. Intraneuronal inclusion bodies have recently been associated with a wide range of inherited neurodegenerative disorders and may provide a clue to etiopathogenesis, in addition to potentially indicating a function of torsinA.


Subject(s)
Chorea/genetics , Chorea/pathology , Inclusion Bodies/chemistry , Inclusion Bodies/pathology , Neurons/pathology , Peptides/analysis , Acanthocytes/pathology , Adult , Atrophy , Cerebral Cortex/chemistry , Cerebral Cortex/pathology , Female , Humans , Inclusion Bodies/genetics , Magnetic Resonance Imaging/methods , Male , Middle Aged , Neurons/chemistry , Pedigree
19.
Oncogene ; 20(49): 7186-203, 2001 Oct 29.
Article in English | MEDLINE | ID: mdl-11704847

ABSTRACT

Acute promyelocytic leukemia (APL) has been recognized as a distinct clinical entity for over 40 years. Although relatively rare among hematopoietic malignancies (approximately 10% of AML cases), this disease has attracted a particularly good share of attention by becoming the first human cancer in which all-trans-retinoic acid (ATRA), a physiologically active derivative of vitamin A, was able to induce complete remission (CR). ATRA induced remission is not associated with rapid cell death, as in the case of conventional chemotherapy, but with a restoration of the 'normal' granulocytic differentiation pathway. With this remarkable medical success story APL has overnight become a paradigm for the differentiation therapy of cancer. A few years later, excitement with APL was further enhanced by the discovery that a cytogenetic marker for this disease, the t(15:17) reciprocal chromosomal translocation, involves a fusion between the retinoic acid receptor alpha (RARalpha) gene and a previously unknown locus named promyelocytic leukemia (PML). Consequence of this gene rearrangement is expression of the PML-RARalpha chimeric oncoprotein, which is responsible for the cellular transformation as well as ATRA response that is observed in APL. Since this initial discovery, a number of different translocation partner genes of RARalpha have been reported in rarer cases of APL, strongly suggesting that disruption of RARalpha underlies its pathogenesis. This article reviews various rearrangements of the RARalpha gene that have so far been described in literature, functions of the proteins encoded by the different RARalpha partner loci, and implications that these may have for the molecular pathogenesis of APL.


Subject(s)
Leukemia, Promyelocytic, Acute/genetics , Milk Proteins , Receptors, Retinoic Acid/genetics , Translocation, Genetic/genetics , Antigens, Nuclear , Cell Cycle Proteins , DNA-Binding Proteins/genetics , Humans , Leukemia, Promyelocytic, Acute/drug therapy , Neoplasm Proteins/genetics , Nuclear Matrix-Associated Proteins , Nuclear Proteins/genetics , Nucleophosmin , Oncogene Proteins, Fusion/genetics , Retinoic Acid Receptor alpha , STAT5 Transcription Factor , Trans-Activators/genetics , Tretinoin
20.
J Dent Educ ; 65(3): 262-8, 2001 Mar.
Article in English | MEDLINE | ID: mdl-11318092

ABSTRACT

The dental school arose from the premise that a dental school would round out the university and add prestige to the burgeoning Health Professions Division with its five schools and eight health programs. The school was founded in light of the following circumstances. Patient Pool Evaluation of community facilities and services revealed that there was an increasing patient pool, without disturbing the present mix. There was evidence of a need for dental care for large numbers of unserved or underserved people. Financial Considerations Proforma and cash flow budget projections showed financial stability of this project. The university was recognized to have the ability to absorb initial capital costs. HPD had a history of the success in functioning with tuition-dependent budgets. University Factors The university has had success in establishing and operating five health professions schools. A complete and experienced infrastructure has existed for sixteen years in the University and in the Health Professions Division. The university would provide unconditional administrative support.


Subject(s)
Schools, Dental , Universities , Curriculum , Education, Dental , Faculty, Dental , Financial Management , Florida , Humans , Patients/statistics & numerical data , Schools, Dental/economics , Schools, Dental/organization & administration , Students, Dental/statistics & numerical data , Workforce
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