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1.
Reumatismo ; 71(1): 24-30, 2019 Apr 01.
Article in English | MEDLINE | ID: mdl-30932440

ABSTRACT

We performed a retrospective analysis to evaluate the survival on first line biologic drug of rheumatoid arthritis (RA) patients with potential occult HBV infection (pOBI). We analysed longitudinal data of 486 consecutive RA patients starting a first biological drug in a time frame from 1st January 2008 to 31st December 2014. Demographic and disease related characteristics were collected at baseline and at the last observation visit. Baseline serological markers of HBV infection and causes of treatment discontinuation were also recorded. Primary endpoint was the influence of pOBI on drug survival, estimated by Kaplan-Meier life table analysis. Estimates hazard ratios (HRs) of drug discontinuation, adjusted for disease characteristics, biological drug class and HBcAb status were computed by Cox-regression models. The retention rate was significantly lower in pOBI positive patients (58.2%) when compared to pOBI negative ones (67.8%) and this data was confirmed also when only discontinuation due to ineffectiveness was considered (pOBI positive 66.4% vs pOBI negative 75.3%, long rank 7.93, p=0.005). Cox regression models showed a significant association between HBcAb-neg (HR 0.58, 0.41-0.84), higher ESR-DAS28 at baseline (HR 1.07, 1.03-1.11) or RF/ACPA-neg (HR 1.46, 1.04-2.06) and drug discontinuation. Occult HBV infection seems to influence negatively the effectiveness of biological therapies in RA patients.


Subject(s)
Antirheumatic Agents/therapeutic use , Arthritis, Rheumatoid/drug therapy , Hepatitis B/complications , Immunosuppressive Agents/therapeutic use , Medication Adherence/statistics & numerical data , Abatacept/therapeutic use , Antibodies, Monoclonal, Humanized/therapeutic use , Citrullination , DNA, Viral/blood , Etanercept/therapeutic use , Female , Glucocorticoids/therapeutic use , Hepatitis B Core Antigens/blood , Hepatitis B virus/genetics , Hepatitis B virus/immunology , Humans , Kaplan-Meier Estimate , Male , Methotrexate/therapeutic use , Middle Aged , Registries , Retrospective Studies
2.
J Plast Reconstr Aesthet Surg ; 72(4): 656-661, 2019 Apr.
Article in English | MEDLINE | ID: mdl-30808599

ABSTRACT

INTRODUCTION: The navel plays a major role in the aesthetics of the abdomen. A navel that is abnormally shaped, malpositioned or has evident scarring may compromise the outcome of an otherwise well-executed full abdominoplasty. The aim of the technique in question is to recreate a navel that looks natural, with no visible scar, and that is properly positioned. MATERIALS AND METHODS: The technique was performed in 147 abdominoplasties of patients of both sexes (123 females and 24 males), with an average age of 35 years and a mean BMI of 24 kg/m2. The procedure involves the creation of a navel of reduced size, 10 × 5 mm, and its inset in the abdominal wall. Subsequently, the as-yet-not sutured abdominal flap is extended caudally to determine the point of projection of the navel. The abdominal skin is marked, the flap is reversed and an internal suture is carried out. RESULTS: The appearance of the navel is aesthetically pleasant and natural looking and with no visible scarring. In addition, the position of the umbilicus is always correct. At the two-year follow-up, the results remain stable. No major complication occurred. CONCLUSIONS: The technique allows for the attainment of an extremely natural looking navel that satisfies the aesthetic criteria of attractiveness without visible scarring. The navel is always correctly positioned, without requiring measurements during surgery. The procedure is rapid, and although it does require a short learning curve, the results are extremely aesthetically pleasing and reproducible. The patient satisfaction rate is extremely high.


Subject(s)
Abdominoplasty/methods , Umbilicus/surgery , Adult , Cicatrix/prevention & control , Female , Humans , Male , Surgical Flaps/surgery , Suture Techniques
3.
J Anim Physiol Anim Nutr (Berl) ; 102(1): e111-e121, 2018 Feb.
Article in English | MEDLINE | ID: mdl-28444804

ABSTRACT

The effects of resistant starch (RS) intake on nutrient digestibility, microbial fermentation products, faecal IgA, faecal pH, and histological features of the intestinal mucosa of old dogs were evaluated. The same formulation was extruded in two different conditions: one to obtain elevated starch cooking degree with low RS content (0.21%) and the other lower starch cooking with high RS content (1.46%). Eight geriatric Beagles (11.5 ± 0.38 years old) were fed each diet for 61 days in a crossover design. Food intake, nutrient digestibility, fermentation products, faecal pH, and faecal IgA were examined via variance analysis. Histological results of intestinal biopsies were assessed via Wilcoxon test for paired data. The morphometric characteristics of large intestine crypts were evaluated via paired t tests (p < .05). Protein, fat, and energy digestibilities were higher for the low-RS diet (p < .05). Dogs receiving the high-RS diet had lower faecal pH and higher values for propionate, butyrate, total volatile fatty acids, and lactate (p < .05). No differences between diets were found in the histological parameters of the gut mucosa, and only a tendency for deeper crypts in the descending colon was observed for dogs fed the high-RS diet (p = .083). The intake of a corn-based kibble diet manufactured with coarse ground raw material and low starch gelatinization to obtain 1.4% of RS affected microbial fermentation products and faecal pH and tended to increase crypt depth in the descending colon of old dogs.


Subject(s)
Aging , Animal Feed/analysis , Dietary Carbohydrates , Intestinal Mucosa/anatomy & histology , Starch/metabolism , Animals , Biopsy/veterinary , Digestion , Dogs , Feces/chemistry , Female , Fermentation , Gastric Mucosa/anatomy & histology , Gastric Mucosa/pathology , Hydrogen-Ion Concentration , Immunoglobulin A/chemistry , Intestinal Mucosa/pathology , Male
4.
Leukemia ; 31(8): 1760-1769, 2017 08.
Article in English | MEDLINE | ID: mdl-27890933

ABSTRACT

Inhibition of the bromodomain and extra-terminal (BET) proteins is a promising therapeutic strategy for various hematologic cancers. Previous studies suggest that BET inhibitors constrain tumor cell proliferation and survival mainly through the suppression of MYC transcription and activity. However, suppression of the transcription of additional genes also contributes to the antitumor activity of BET inhibitors but is less well understood. Here we examined the therapeutic potential of CPI-0610, a potent BET inhibitor currently undergoing phase I clinical testing, in multiple myeloma (MM). CPI-0610 displays potent cytotoxicity against MM cell lines and patient-derived MM cells through G1 cell cycle arrest and caspase-dependent apoptosis. CPI-0610-mediated BET inhibition overcomes the protective effects conferred by cytokines and bone marrow stromal cells. We also confirmed the in vivo efficacy of CPI-0610 in a MM xenograft mouse model. Our study found IKZF1 and IRF4 to be among the primary targets of CPI-0610, along with MYC. Given that immunomodulatory drugs (IMiDs) stabilize cereblon and facilitate Ikaros degradation in MM cells, we combined it with CPI-0610. Combination studies of CPI-0610 with IMiDs show in vitro synergism, in part due to concomitant suppression of IKZF1, IRF4 and MYC, providing a rationale for clinical testing of this drug combination in MM patients.


Subject(s)
Benzazepines/pharmacology , Isoxazoles/pharmacology , Multiple Myeloma/drug therapy , Nuclear Proteins/antagonists & inhibitors , Protein Serine-Threonine Kinases/antagonists & inhibitors , Transcription Factors/antagonists & inhibitors , Animals , Cell Cycle Proteins , G1 Phase Cell Cycle Checkpoints , Humans , Ikaros Transcription Factor/analysis , Ikaros Transcription Factor/genetics , Interferon Regulatory Factors/analysis , Interferon Regulatory Factors/genetics , Mice , Multiple Myeloma/pathology , Proto-Oncogene Proteins c-myc/analysis , Proto-Oncogene Proteins c-myc/genetics
5.
Blood Cancer J ; 6(8): e462, 2016 08 26.
Article in English | MEDLINE | ID: mdl-27564460

ABSTRACT

Pan proviral integrations of Moloney virus (PIM) inhibition in multiple myeloma (MM) results in reduced cell viability in tested human-derived MM cell lines and reduces tumor burden in xenograft mouse models, making PIMs important therapeutic targets for the disease. PIM kinase inhibitors are currently being tested clinically in MM. We sought to elucidate the role of the various PIMs in MM. Our data demonstrate that Pim2 has a significant role in MM cell cytotoxicity. Our data provide evidence for a novel role for Pim2 in the regulation of the DNA damage response (DDR). Knockdown of Pim2 upregulates several downstream DDR markers, mimicking the effects of doxorubicin (Dox) treatment of MM cells, and suggesting a role for the kinase as a negative regulator of this pathway. Dox-induced DNA damage results in a decrease in Pim2 levels, placing the kinase directly downstream of the site of Dox-DNA binding. Overexpression of Pim2 confers a slight survival advantage against Dox through antiapoptotic activity, further underscoring its relevance in the DDR pathway. These data provide insights into a novel mechanism of PIM kinase activity and provide the framework for designing therapeutic approaches in MM.


Subject(s)
DNA Damage , Multiple Myeloma/genetics , Multiple Myeloma/metabolism , Protein Serine-Threonine Kinases/genetics , Protein Serine-Threonine Kinases/metabolism , Proto-Oncogene Proteins/genetics , Proto-Oncogene Proteins/metabolism , Apoptosis/drug effects , Apoptosis/genetics , Cell Cycle/drug effects , Cell Cycle/genetics , Cell Line, Tumor , Cell Survival/drug effects , Cell Survival/genetics , DNA Damage/drug effects , Enzyme Activation , Gene Knockdown Techniques , Humans , Signal Transduction
8.
Clin Ter ; 165(1): 27-30, 2014.
Article in Italian | MEDLINE | ID: mdl-24589947

ABSTRACT

Case report. Co-morbidity between central serous chorioretinopathy (C.R.S.C.) and narcissistic personality disorder. A reflection on the importance of an integrated approach to this ophthalmological disease through the description of its psychosomatic aspects and the evaluation of the nosographic definition in psychiatry. The central serous chorioretinopathy (C.R.S.C.) is a transudative disease affecting the posterior pole of the eye, that rapidly compromises the visual acuity, although it is a self-limited disease. Narcissism is a personality disorder characterised by an extreme gratification of self, without actually taking care of other people. In the current work both the diseases, along with the respective psychosomatic consequences the patient received, are examined.


Subject(s)
Central Serous Chorioretinopathy/psychology , Narcissism , Adult , Central Serous Chorioretinopathy/physiopathology , Humans , Male , Visual Acuity
9.
Am J Hum Biol ; 26(4): 559-61, 2014.
Article in English | MEDLINE | ID: mdl-24668932

ABSTRACT

OBJECTIVES: Congenital adrenal hyperplasia (CAH) is a disease that occurs during fetal development and can lead to virilization in females or death in newborn males if not discovered early in life. Because of this there is a need to seek morphological markers in order to help diagnose the disease. In order to test the hypothesis that prenatal hormones can affect the sexual dimorphic pattern 2D:4D digit ratio in individual with CAH, the aim of this study was to compare the digit ratio in female and male patients with CAH and control subjects. METHODS: The 2D:4D ratios in both hands of 40 patients (31 females-46, XX, and 9 males-46, XY) were compared with the measures of control individuals without CAH (100 males and 100 females). RESULTS: Females with CAH showed 2D:4D ratios typical of male controls (0.950 and 0.947) in both hands (P < 0.001). In CAH males the left hand 2D:4D ratio (0.983) was statistically different from that of male controls (P < 0.05). CONCLUSIONS: These finding support the idea that sexual dimorphism in skeletal development in early fetal life is associated with differences between the exposure to androgens in males and females, and significant differences associated with adrenal hyperplasia. Although the effects of prenatal androgens on skeletal developmental are supported by numerous studies, further investigation is yet required to clarify the disease and establish the digit ratio as a biomarker for CAH.


Subject(s)
Adrenal Hyperplasia, Congenital/diagnosis , Fingers/anatomy & histology , Adrenal Hyperplasia, Congenital/etiology , Androgens/metabolism , Anthropometry , Brazil , Child , Female , Humans , Male
10.
Leukemia ; 28(9): 1892-901, 2014 Sep.
Article in English | MEDLINE | ID: mdl-24518207

ABSTRACT

Bruton's tyrosine kinase (Btk) modulates B-cell development and activation and has an important role in antibody production. Interestingly, Btk may also affect human osteoclast (OC) function; however, the mechanism was unknown. Here we studied a potent and specific Btk inhibitor, CC-292, in multiple myeloma (MM). In this report, we demonstrate that, although CC-292 increased OC differentiation, it inhibited OC function via inhibition of c-Src, Pyk2 and cortactin, all involved in OC-sealing zone formation. As CC-292 did not show potent in vitro anti-MM activity, we next evaluated it in combination with the proteasome inhibitor, carfilzomib. We first studied the effect of carfilzomib on OC. Carfilzomib did not have an impact on OC-sealing zone formation but significantly inhibited OC differentiation. CC-292 combined with carfilzomib inhibited both sealing zone formation and OC differentiation, resulting in more profound inhibition of OC function than carfilzomib alone. Moreover, the combination treatment in an in vivo MM mouse model inhibited tumor burden compared with CC-292 alone; it also increased bone volume compared with carfilzomib alone. These results suggest that CC-292 combined with carfilzomib augments the inhibitory effects against OC within the bone microenvironment and has promising therapeutic potential for the treatment of MM and related bone disease.


Subject(s)
Acrylamides/administration & dosage , Multiple Myeloma/drug therapy , Oligopeptides/administration & dosage , Osteoclasts/drug effects , Proteasome Inhibitors/administration & dosage , Protein-Tyrosine Kinases/antagonists & inhibitors , Pyrimidines/administration & dosage , Acrylamides/pharmacology , Actins/antagonists & inhibitors , Agammaglobulinaemia Tyrosine Kinase , Animals , Bone Resorption/prevention & control , Cell Differentiation , Cell Line, Tumor , Cell Survival/drug effects , Humans , Mice , Mice, SCID , Multiple Myeloma/pathology , Pyrimidines/pharmacology
12.
SD, Rev. med. int. Síndr. Down (Ed. castell.) ; 17(3): 36-38, sept.-dic. 2013. ilus
Article in Spanish | IBECS | ID: ibc-118459

ABSTRACT

Los portadores de un reordenamiento que afecta al cromosoma 21 tienen un riesgo potencial de concepciones genéticamente desequilibradas que pueden dar origen a niños con síndrome de Down (SD). Los riesgos reproductivos de las parejas portadoras de una translocación robertsoniana equilibrada dependen de los cromosomas reordenados y del sexo del portador. Este artículo tiene como objetivo analizar la tendencia de segregación y reproductiva de una rara translocación 15/21 en cinco generaciones de una familia. Se consideraron los avances actuales en tecnología reproductiva como una posibilidad para evitar la aneuploidía fetal. Dado el riesgo genético, el diagnóstico de preimplantación aparece también como una alternativa para evitar la posibilidad de un aborto posterior no deseado y para obtener una descendencia saludable (AU)


The carriers of a rearrangement involving with chromosome 21 have a potential risk of genetically unbalanced conceptions, which may result in liveborn children with Down syndrome. Reproductive risks for couples carriers of a balanced Robertsonian translocation depends on the rearranged chromosomes and the sex of the carrier. This article aims to analyze the segregation and reproductive trend of a rare 15/21 translocation in five generations of a family. It was considered the current advances in reproductive technology as a possibility to prevent fetal aneuploidia. Given the genetic risk, the preimplantation diagnosis appears also as an alternative to avoid the option of an unwanted later abortion and to obtain a healthy progeny (AU)


Subject(s)
Humans , Male , Female , Down Syndrome/complications , Down Syndrome/genetics , Genetic Counseling/methods , Genetic Counseling/organization & administration , Genetic Counseling/standards , Gene Rearrangement/genetics , Gene Rearrangement/physiology , Genetic Counseling/statistics & numerical data , Genetic Counseling , Chromosomes, Human, Pair 21 , Chromosomes, Human, Pair 21/genetics , Chromosomes, Human, Pair 21/metabolism , Fertility/genetics
13.
SD, Rev. med. int. Síndr. Down (Ed. castell.) ; 17(3): 39-42, sept.-dic. 2013. ilus
Article in Spanish | IBECS | ID: ibc-118460

ABSTRACT

La vida sexual de las personas con síndrome de Down (SD) u otros trastornos asociados con la discapacidad intelectual sigue siendo un tabú, con pocos relatos en la literatura. Los avances en el conocimiento de los aspectos causales y nosológicos, incluidas sus conquistas sociales, llevaron al fortalecimiento del movimiento inclusivo destinado a estas personas. En este artículo se presenta un caso inusual de un matrimonio de una mujer con SD que tiene un hijo. Esta mujer estudió en escuelas especiales y se comunica bien verbalmente. Presentó menarquía a los 13 años de edad, y demostró autonomía en el cuidado de su cuerpo. Ocho años atrás conoció a su actual esposo en una escuela especial. Después de 2 años de matrimonio, ella quedó embarazada de un varón sin este síndrome. La mujer es capaz de atender las necesidades de su hijo, responsabilidad que comparte con su madre, que fue la principal responsable de su educación hacia la autonomía. El cariotipo de la probanda reveló trisomía 21 con mosaicismo cromosómico. Se están produciendo nuevos logros sociales, incluido el establecimiento de relaciones afectivas perdurables. Las posibilidades de reproducción y el riesgo de recurrencia del SD de ben ser considerados en el consejo genético. El cuidado de todos los niños nacidos de estos matrimonios genera responsabilidades compartidas por estos padres especiales y sus familias (AU)


Sex life of people with Down syndrome (DS) or other conditions associated with intellectual disability is still a taboo, with few reports in the literature. Advances in knowledge of causal and nosological aspects, including its social achievements, have led to the strengthening of the inclusive movement aimed at those people. This paper presents an unusual case of successful marriage and reproduction of a woman with DS. The propositus studied in special schools and communicates well verbally. She presented menarche at age of 13, showing autonomy in caring for her body. Eight years ago she met her current husband at the special school she attended. Two years after the wedding, the proband became pregnant of a male child without the syndrome. She is able to take care of her child needs, sharing this responsibility with her own mother, who was primarily responsible for her education directed towards autonomy. The proband's karyotype revealed trisomy 21 with chromosomal mosaicism. New social achievements are occurring, among them the establishment of lasting emotional relationships. The reproductive chances and risks of recurrence of DS should be considered in genetic counseling. The breeding and rearing of any children born from these marriages become new responsibilities shared by these special parents and their families (AU)


Subject(s)
Humans , Male , Female , Pregnancy , Down Syndrome/epidemiology , Down Syndrome/genetics , Down Syndrome/physiopathology , Down Syndrome/complications , Down Syndrome/diagnosis , Mosaicism/chemically induced , Mosaicism , Marriage/legislation & jurisprudence , Marriage/trends , Intellectual Disability/epidemiology , Intellectual Disability/genetics , Intellectual Disability/prevention & control
14.
Leukemia ; 27(12): 2366-75, 2013 Dec.
Article in English | MEDLINE | ID: mdl-23807770

ABSTRACT

Small-molecule multi-targeted cyclin-dependent kinase (CDK) inhibitors (CDKIs) are of particular interest due to their potent antitumor activity independent of p53 gene alterations. P53 deletion is associated with a very poor prognosis in multiple myeloma (MM). In this regard, we tested the anti-MM activity of RGB-286638, an indenopyrazole-derived CDKI with Ki-nanomolar activity against transcriptional CDKs. We examined RGB-286638's mode-of-action in MM cell lines with wild-type (wt)-p53 and those expressing mutant p53. RGB-286638 treatment resulted in MM cytotoxicity in vitro associated with inhibition of MM tumor growth and prolonged survival in vivo. RGB-286638 displayed caspase-dependent apoptosis in both wt-p53 and mutant-p53 cells that was closely associated with the downregulation of RNA polymerase II phosphorylation and inhibition of transcription. RGB-286638 triggered p53 accumulation via nucleolar stress and loss of Mdm2, accompanied by induction of p53 DNA-binding activity. In addition, RGB-286638 mediated p53-independent activity, which was confirmed by cytotoxicity in p53-knockdown and p53-mutant cells. We also demonstrated downregulation of oncogenic miR-19, miR-92a-1 and miR-21. Our data provide the rationale for the development of transcriptional CDKIs as therapeutic agents, which activate p53 in competent cells, while circumventing p53 deficiency through alternative p53-independent cell death mechanisms in p53-mutant/deleted cells.


Subject(s)
Cyclin-Dependent Kinases/antagonists & inhibitors , Multiple Myeloma/pathology , Pyrazoles/pharmacology , Transcription, Genetic/drug effects , Tumor Suppressor Protein p53/physiology , Urea/analogs & derivatives , Animals , Apoptosis/drug effects , Humans , Male , Mice , Phosphorylation , Protein Kinase Inhibitors/pharmacology , Real-Time Polymerase Chain Reaction , Urea/pharmacology , Xenograft Model Antitumor Assays
15.
Leukemia ; 27(8): 1715-21, 2013 Aug.
Article in English | MEDLINE | ID: mdl-23417027

ABSTRACT

Given the prevalence of osteolytic bone disease in multiple myeloma (MM), novel therapies targeting bone microenvironment are essential. Previous studies have identified activin A to be of critical importance in MM-induced osteolysis. Lenalidomide is a known and approved treatment strategy for relapsed MM. Our findings demonstrate that lenalidomide acts directly on bone marrow stromal cells via an Akt-mediated increase in Jun N-terminal kinase-dependent signaling resulting in activin A secretion, with consequent inhibition of osteoblastogenesis. Here, we attempted to augment the antitumor benefits of lenalidomide while overcoming its effects on osteoblastogenesis by combining it with a neutralizing antibody to activin A. Increased activin A secretion induced by lenalidomide was abrogated by the addition of activin A-neutralizing antibody, which effectively restored osteoblast function and inhibited MM-induced osteolysis without negating the cytotoxic effects of lenalidomide on malignant cells. This provides the rationale for an ongoing clinical trial (NCT01562405) combining lenalidomide with an anti-activin A strategy.


Subject(s)
Activins/antagonists & inhibitors , Angiogenesis Inhibitors/pharmacology , Antibodies, Neutralizing/pharmacology , Antineoplastic Agents/pharmacology , Multiple Myeloma/metabolism , Thalidomide/analogs & derivatives , Activins/metabolism , Cell Differentiation/drug effects , Cell Line, Tumor , Humans , Lenalidomide , MAP Kinase Signaling System/drug effects , Multiple Myeloma/genetics , Osteoblasts/cytology , Osteoblasts/drug effects , Osteoblasts/metabolism , Stromal Cells/drug effects , Stromal Cells/metabolism , Thalidomide/pharmacology
16.
Clin Ter ; 163(6): e397-400, 2012 Nov.
Article in Italian | MEDLINE | ID: mdl-23306752

ABSTRACT

AIM: The aim of our study was to highlight the palpebral and ocular signs in patients with thyroid dysfunction. These patients are sometimes poorly evaluated in routine check ups. This information is useful both to the practicing ophthalmologist but also to the specialist in endocrinology. PATIENTS AND METHODS: 100 patients were enrolled. The patients had been diagnosed with the Basedow-Graves-Flajani syndrome or had hypothyroidism or thyroidits. Orbital, adnexal and ocular signs were recorded in all patients. RESULTS: Seventeen oculopalpebral signs were observed in a total of 100 patients (73 females and 27 males). These were as follows: Dalrymple, Von Graefe, Rosenbach, Inglese, Gifford, Enroth, Jellinek, Stellwag, Jeffroy, Topolansky, Moebius, Suker, Sattler, Sainton, Ballet, Cowens, Exphothalmos. DISCUSSION: The specialist in endocrinology has many laboratory and clinical tools in the diagnosis of patients with thyroid dysfunction. However, with a better awareness of the oculopalpebral signs both the ophthalmologist and the endocrinologist can work together in a multidisciplinary team towards the management of these patients.


Subject(s)
Eye Diseases/etiology , Eyelid Diseases/etiology , Thyroid Diseases/complications , Adult , Female , Humans , Male , Middle Aged , Ophthalmology
17.
Leukemia ; 25(7): 1174-81, 2011 Jul.
Article in English | MEDLINE | ID: mdl-21403648

ABSTRACT

Upregulation of cytokines and chemokines is a frequent finding in multiple myeloma (MM). CCL3 (also known as MIP-1α) is a pro-inflammatory chemokine, levels of which in the MM microenvironment correlate with osteolytic lesions and tumor burden. CCL3 and its receptors, CCR1 and CCR5, contribute to the development of bone disease in MM by supporting tumor growth and regulating osteoclast (OC) differentiation. In this study, we identify inhibition of osteoblast (OB) function as an additional pathogenic mechanism in CCL3-induced bone disease. MM-derived and exogenous CCL3 represses mineralization and osteocalcin production by primary human bone marrow stromal cells and HS27A cells. Our results suggest that CCL3 effects on OBs are mediated by ERK activation and subsequent downregulation of the osteogenic transcription factor osterix. CCR1 inhibition reduced ERK phosphorylation and restored both osterix and osteocalcin expression in the presence of CCL3. Finally, treating SCID-hu mice with a small molecule CCR1 inhibitor suggests an upregulation of osteocalcin expression along with OC downregulation. Our results show that CCL3, in addition to its known catabolic activity, reduces bone formation by inhibiting OB function, and therefore contributes to OB/OC uncoupling in MM.


Subject(s)
Bone Remodeling/physiology , Calcification, Physiologic/physiology , Chemokine CCL3/physiology , Gene Expression Regulation, Neoplastic/physiology , Multiple Myeloma/complications , Neoplasm Proteins/physiology , Osteoblasts/physiology , Osteocalcin/biosynthesis , Osteogenesis/physiology , Osteolysis/etiology , Animals , Bone Marrow Cells/metabolism , Cell Line, Tumor/metabolism , Down-Regulation , Extracellular Signal-Regulated MAP Kinases/biosynthesis , Extracellular Signal-Regulated MAP Kinases/genetics , Humans , Mesenchymal Stem Cells/metabolism , Mice , Mice, SCID , Multiple Myeloma/metabolism , Multiple Myeloma/pathology , Neoplasm Proteins/biosynthesis , Neoplasm Proteins/genetics , Neoplasm Transplantation , Osteocalcin/genetics , Osteoclasts/physiology , Osteolysis/metabolism , Osteolysis/pathology , Receptors, CCR1/biosynthesis , Receptors, CCR1/genetics , Receptors, CCR5/biosynthesis , Receptors, CCR5/genetics , Sp7 Transcription Factor , Stromal Cells/metabolism , Transcription Factors/biosynthesis , Transcription Factors/genetics
18.
Oncogene ; 29(16): 2325-36, 2010 Apr 22.
Article in English | MEDLINE | ID: mdl-20101221

ABSTRACT

Dysregulated cell cycling is a universal hallmark of cancer and is often mediated by abnormal activation of cyclin-dependent kinases (CDKs) and their cyclin partners. Overexpression of individual complexes are reported in multiple myeloma (MM), making them attractive therapeutic targets. In this study, we investigate the preclinical activity of a novel small-molecule multi-CDK inhibitor, AT7519, in MM. We show the anti-MM activity of AT7519 displaying potent cytotoxicity and apoptosis; associated with in vivo tumor growth inhibition and prolonged survival. At the molecular level, AT7519 inhibited RNA polymerase II (RNA pol II) phosphorylation, a CDK9, 7 substrate, associated with decreased RNA synthesis confirmed by [(3)H] Uridine incorporation. In addition, AT7519 inhibited glycogen synthase kinase 3beta (GSK-3beta) phosphorylation; conversely pretreatment with a selective GSK-3 inhibitor and shRNA GSK-3beta knockdown restored MM survival, suggesting the involvement of GSK-3beta in AT7519-induced apoptosis. GSK-3beta activation was independent of RNA pol II dephosphorylation confirmed by alpha-amanitin, a specific RNA pol II inihibitor, showing potent inhibition of RNA pol II phosphorylation without corresponding effects on GSK-3beta phosphorylation. These results offer new insights into the crucial, yet controversial role of GSK-3beta in MM and show significant anti-MM activity of AT7519, providing the rationale for its clinical evaluation in MM.


Subject(s)
Apoptosis/drug effects , Cyclin-Dependent Kinases/antagonists & inhibitors , Glycogen Synthase Kinase 3/metabolism , Multiple Myeloma/drug therapy , Piperidines/pharmacology , Pyrazoles/pharmacology , RNA Polymerase II/antagonists & inhibitors , Animals , Cell Cycle/drug effects , Cell Line, Tumor , Cell Proliferation/drug effects , Dose-Response Relationship, Drug , Enzyme Activation/drug effects , Glycogen Synthase Kinase 3 beta , Humans , Male , Mice , Mice, SCID , Multiple Myeloma/pathology
19.
Leukemia ; 23(9): 1679-86, 2009 Sep.
Article in English | MEDLINE | ID: mdl-19369963

ABSTRACT

Earlier studies have shown that ascorbic acid (vitamin C) inhibits bortezomib-induced cytotoxicity against cancer cells in vitro. However, the clinical significance of vitamin C on bortezomib treatment is unclear. In this study, we examined whether daily oral intake of vitamin C inhibits antimultiple myeloma (MM) activities of bortezomib. Vitamin C, at orally achievable concentrations, inhibited in vitro MM cell cytotoxicity of bortezomib and blocked its inhibitory effect on 20S proteasome activity. Specifically, plasma collected from healthy volunteers taking 1 g/day vitamin C reduced bortezomib-induced MM cell death in vitro. This antagonistic effect of vitamin C against proteasome inhibitors is limited to the boronate class of inhibitors (bortezomib and MG262). In vivo activity of this combination treatment was then evaluated using our xenograft model of human MM in SCID (severe combined immune-deficient) mice. Bortezomib (0.1 mg/kg twice a week for 4 weeks) significantly inhibits in vivo MM cell growth, which was blocked by oral vitamin C (40 mg/kg/day). Therefore, our results for the first time show that vitamin C can significantly reduce the activity of bortezomib treatment in vivo; and importantly, suggest that patients receiving treatment with bortezomib should avoid taking vitamin C dietary supplements.


Subject(s)
Antineoplastic Agents/antagonists & inhibitors , Antioxidants/pharmacology , Ascorbic Acid/pharmacology , Boronic Acids/antagonists & inhibitors , Pyrazines/antagonists & inhibitors , Animals , Bortezomib , Cell Line, Tumor , Cell Proliferation/drug effects , Humans , Mice , Multiple Myeloma/drug therapy , Proteasome Inhibitors
20.
Transplant Proc ; 40(6): 2015-8, 2008.
Article in English | MEDLINE | ID: mdl-18675118

ABSTRACT

BACKGROUND: Superimposed acute right ventricular dysfunction in the setting of preexisting pulmonary hypertension is a nearly fatal complication after heart transplantation. The optimal treatment modality remains a matter of debate. Recently, sildenafil citrate, a nonselective pulmonary vasodilator, has gained popularity in the treatment of pulmonary hypertension in transplant candidates. METHODS: Herein we have presented a series of 13 patients in whom sildenafil was used to treat right ventricular dysfunction and pulmonary hypertension as detected by transesophageal echocardiography and Swan-Ganz right heart catheterization after heart transplant. Their characteristics were mean age 49+/-11.4 years; 38.4% with previous cardiac procedures, 30.8% status I, basal pulmonary vascular resistance index 10.4+/-4.6 WoodU, mean transpulmonary gradient 18.7+/-5.4 mmHg. In addition to conventional inodilator support, we administered 1 to 3 mg per kilogram of sildenafil. Complete hemodynamic measurements were obtained before and after the institution of the therapy and at 1-month follow-up. RESULTS: Within the first 72 hours, acute right ventricular dysfunction resolved in all cases without untoward side effects or significant systemic impact. Sildenafil significantly decreased the transpulmonary gradient and pulmonary vascular resistance index relative to baseline values; 5.6+/-1.82 versus 10.4+/-4.6 WU, (P< .05), 13.5+/-3.4 mm Hg versus 18.7+/-5.4 mm Hg (P< .05), respectively. Improved indices of right ventricular function were observed on echocardiographic monitoring. After 1 month, sildenafil treatment was discontinued. CONCLUSION: Management of acute right ventricular dysfunction in heart transplant recipients with pulmonary hypertension using sildenafil proved safe and effective.


Subject(s)
Heart Transplantation/physiology , Hypertension, Pulmonary/drug therapy , Piperazines/therapeutic use , Sulfones/therapeutic use , Vasodilator Agents/therapeutic use , Ventricular Dysfunction, Right/drug therapy , Adult , Cardiac Catheterization , Child , Echocardiography, Transesophageal , Female , Heart Transplantation/adverse effects , Heart Transplantation/mortality , Heart-Assist Devices , Humans , Hypertension, Pulmonary/diagnostic imaging , Hypertension, Pulmonary/etiology , Hypertension, Pulmonary/physiopathology , Middle Aged , Postoperative Complications/drug therapy , Purines/therapeutic use , Radiography , Retrospective Studies , Sildenafil Citrate , Treatment Outcome , Vascular Resistance , Ventricular Dysfunction, Right/etiology
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