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1.
Artigo em Inglês | MEDLINE | ID: mdl-32085465

RESUMO

A mother's milk offers several benefits to infant's health, but, some factors may lead to a reduction in the duration of breastfeeding, such as maternal stress. The objective of our study is to determine if the rate of breastfeeding can be influenced by stress induced by infants' hospitalization. A preliminary observational non-randomized study was carried out in Bambino Gesù Children's Hospital between October 2016 and January 2017, in order to elucidate a possible relationship between breastfeeding and maternal stress, linked to hospitalization. We modeled the modified version of the PSS NICU (Parental Stressor Scale-neonatal intensive care unit) questionnaire, which investigated parental stress during hospitalization. This included 33 items with a score from 0 to 5. The overall score, high stress, was established at 85 points or higher. The principal statistically significant correlation was between 'high PSS score' and reduced breastfeeding during hospitalization (p-value: 0.048; OR: 2.865, 95%; CI: 1.008-8.146). This relation was not influenced by other descriptive characteristics of the mother. The PSS questionnaire can be an instrument to evaluate the influence of stress in breastfeeding and to monitor the rate and success of lactation. Our study highlights that the stress from hospitalization could influence the success of breastfeeding, mostly in intensive settings and during long hospitalizations.


Assuntos
Aleitamento Materno , Cesárea , Mães , Estresse Psicológico , Adulto , Aleitamento Materno/psicologia , Criança , Feminino , Hospitalização , Humanos , Recém-Nascido , Unidades de Terapia Intensiva Neonatal , Leite Humano , Mães/psicologia , Gravidez , Adulto Jovem
2.
Poult Sci ; 99(1): 612-619, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-32416849

RESUMO

A study was carried out to evaluate meat quality traits in fast-growing chickens stimulated in ovo with trans-galactoolighosaccarides (GOS) and exposed to heat stress. On day 12 of egg incubation, 3,000 fertilized eggs (Ross 308) were divided into prebiotic group (GOS) injected with 3.5 mg GOS/egg, saline group (S) injected with physiological saline, and control group (C) uninjected. After hatching, 900 male chicks (300 chicks/treatment) were reared in floor pens in either thermoneutral (TN; 6 pens/group, 25 birds/pen) or heat stress conditions (HS, 30°C from 32 to 42 D; 6 pens/group, 25 birds/pen). At 42 D of age, 15 randomly chosen birds/treatment/temperature were slaughtered and the pectoral muscle (PM) was removed for analyses. Data were analyzed by GLM in a 3 × 2 factorial design. In ovo treatment had no effect on PM weight, pH, water-holding capacity, and shear force. GOS and S birds had lighter (L*, P < 0.01) PM than C group, whereas the latter showed a higher (P < 0.05) yellowness index (b*) compared to S group. Proximate composition, cholesterol, and intramuscular collagen properties were not affected by treatment. As for fatty acid composition, only total polyunsaturated fatty acids (PUFA) content and n-6 PUFA were slightly lower in GOS group compared to S. Heat stress had a detrimental effect on PM weight (P < 0.01) and increased meat pH (P < 0.01). PM from HS chickens was darker with a higher b* index (P < 0.05) and had a higher (P < 0.01) lipid content and a lower (P < 0.05) total collagen amount. Total saturated fatty acids (SFA), monounsaturated fatty acids (MUFA), and PUFA were similar among groups. Significant interactions between factors were found for fatty acid composition: GOS decreased (P < 0.01) SFA and increased (P < 0.05) MUFA contents in HS birds. In conclusion, in ovo injection of GOS could mitigate the detrimental effect of heat stress on some meat quality traits.


Assuntos
Galinhas , Resposta ao Choque Térmico/efeitos dos fármacos , Carne/análise , Oligossacarídeos/administração & dosagem , Prebióticos/administração & dosagem , Animais , Galinhas/crescimento & desenvolvimento , Injeções/veterinária , Masculino , Óvulo/fisiologia , Distribuição Aleatória
3.
J Child Orthop ; 13(5): 478-485, 2019 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-31695815

RESUMO

PURPOSE: Diméglio (DimS) and Pirani (PirS) scores are the most commonly used scoring systems for evaluation of clubfoot, with many centres performing both. Interobserver reliability of their global score has been rated high in a few studies, but agreement of their subcomponents has been poorly investigated. The aim of the study was to assess interrater reliability of global scores and of items in a clinical setting and to analyse overlapping features of the two scores. METHODS: Fifty-six consecutive idiopathic clubfeet undergoing correction using the Ponseti method were independently evaluated at each casting session by two trained paediatric orthopaedic surgeons using both scores. Interobserver reliability of collected data was analysed; a kappa coefficient > 0.60 was considered adequate. RESULTS: For DimS and PirS, the Pearson correlation coefficients were 0.87 and 0.91 (p < .0001) respectively, and kappa coefficients were 0.23 and 0.31. Among subcomponents, kappa values were rated > 0.60 only for equinus and curvature of lateral border in PirS; muscular abnormality in DimS was rated 0.74 but a high prevalence index (0.94) indicated influence of scarce prevalence of this feature. All other items showed k < 0.60 and were considered to be improved.For overlapping features: posterior and medial crease showed similar agreement in the two systems, items describing equinus and midfoot adduction were much more reliable in PirS than in DimS. CONCLUSIONS: In a clinical setting, despite a high correlation of evaluations for total scores, the interobserver agreement of DimS and PirS was not adequate and only a few items were substantially reliable. Simultaneous use of two scores seemed redundant and some overlapping features showed different reliability according to criterion or scale used. Future scoring systems should improve these limitations. LEVEL OF EVIDENCE: Level I - Diagnostic studies.

4.
J Child Orthop ; 13(5): 471-477, 2019 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-31695814

RESUMO

PURPOSE: A mild delay in gross motor milestones and walking age has been reported in infants with clubfoot. The influence of different treatments on motor development has been poorly investigated. Some parents and physical therapists express concern that the Ponseti method (PM) and its constraints (abduction brace, casts) would affect development more than the French physical therapy method (FM) due to greater immobilization and lesser stimulation.The purpose of this study was to evaluate achievement of three motor milestones (pull-to-standing, cruising and independent walking) in two groups of clubfoot patients treated at two experienced institutes respectively with the PM and FM. METHODS: In all, 52 consecutive infants (full-term at birth, mean age at beginning of treatment 24.3 days (sd 10), mean Dimeglio score 12 (sd 3.4)) were prospectively enrolled (26 patients per centre) and followed up to walking age recording milestones. RESULTS: The two groups were not different in terms of age at the beginning of treatment (p = 0.067) and rate of tenotomy. Age at tenotomy was significantly lower in the PM group (p = 0.000). Severity (p = 0.004) and number of bilateral cases (p = 0.012) were higher in the PM group. A non-significant difference was found for age of achievement of pull-to-standing (p = 0.109), cruising (p = 0.253) and independent ambulation (p = 0.349) between the two groups. Overall, milestones were achieved approximately two months later than normal population. Sex, severity, laterality and need of tenotomy were not found to significantly influence milestones. CONCLUSION: Our results confirmed that infants with clubfoot are expected to have a minimum delay in motor development. Infants treated with the PM and those treated with the FM did not show significant differences in gross motor milestones achievement at walking age. LEVEL OF EVIDENCE: Level II - Prospective comparative therapeutic studies.

5.
Ann Nutr Metab ; 53(3-4): 155-61, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-19011278

RESUMO

BACKGROUND: Severe obesity is a major worldwide public health concern affecting 0.5-5% of the adult population. Adiponectin (Acpr30), an adipokine secreted from adipocytes, shows pleiotropic beneficial effects on obesity and related disorders. In this study, sequence analysis of Acpr30 gene (ACDC) was performed in a highly selected population of severely obese young adult patients from Southern Italy to investigate the associations between polymorphisms in the ACDC gene and the development of severe obesity concomitantly with other features of the metabolic syndrome. METHODS: The ACDC gene was analyzed by direct sequencing in the severely obese patients (n=220) and compared to healthy controls (n=116). The associations between the ACDC gene single-nucleotide polymorphisms (SNPs) and the levels of serum Acpr30 as well as the correlation with the presence of severe obesity jointly associated with other features of the metabolic syndrome were also investigated. Total serum Acpr30 concentrations were measured by the ELISA method. RESULTS: ACDC gene molecular screening revealed the presence of previously described SNPs and a new nucleotide alteration, c.355T>G, leading to a protein variant, p.L119V. Measurement of serum concentration of Acpr30 demonstrated lower levels of Acpr30 in the obese population compared to controls (30.5+/-28.3 vs. 43.9+/-35.7 microg/ml, p<0.01); in particular, significantly lower Acpr30 concentrations were observed in obese patients bearing c.-11377C>G SNP CG+GG genotypes than in those with CC genotype (22.9+/-20.5 vs. 33.1+/-29.4 microg/ml, p<0.05). CONCLUSIONS: Our results confirmed that low serum levels of Acpr30 are related to severe obesity and a difference in protein expression is associated with variants in ACDC gene promoter region.


Assuntos
Obesidade Mórbida/sangue , Obesidade Mórbida/genética , Polimorfismo de Nucleotídeo Único , Adiponectina/sangue , Adiponectina/genética , Adulto , Índice de Massa Corporal , Estudos de Casos e Controles , Distribuição de Qui-Quadrado , Feminino , Genótipo , Humanos , Itália/epidemiologia , Masculino , Síndrome Metabólica/sangue , Síndrome Metabólica/genética , Mutação , Polimorfismo de Nucleotídeo Único/genética , Regiões Promotoras Genéticas
6.
Meat Sci ; 80(3): 623-31, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22063574

RESUMO

The study aimed to evaluate, with regard to the human nutrition, the lipid profile of meat and backfat from gilts and barrows of the Italian autochthonous genotype Casertana and its crossbreed (Casertana×Large White) slaughtered at two different live weights. Meat from the Casertana cross was nutritionally comparable to that from the purebreed and both would be considered healthy, irrespective of sex and weight, due to the relatively low levels of intramuscular lipids and cholesterol. Muscle cholesterol was considerably lower in the heavy pigs than in the light ones and, as weight increased, cholesterol decreased but only in gilts. Females supply meat with higher polyunsaturated fatty acids (PUFA) and slightly lower saturated fatty acids (SFA) respect to barrows and, thus, higher PUFA/SFA ratio. Casertana crossbreds can represent a good alternative to pure Casertana, mainly in the production of Colonnata lard, due to the better fatty acid profile of the subcutaneous adipose tissue. From the nutritional point of view, the optimal slaughtering weight was about 150kg for both genotypes. Heavy pigs, compared to the light ones, produced loin with lower atherogenic and thrombogenic indexes, lower SFA/unsaturated fatty acids ratio, and higher PUFA/SFA ratio.

7.
Ital J Pediatr ; 44(1): 75, 2018 Jul 03.
Artigo em Inglês | MEDLINE | ID: mdl-29970173

RESUMO

BACKGROUND: Newborns with congenital diaphragmatic hernia (CDH) and esophageal atresia (EA) might experience breastfeeding difficulties. The aim of this study was to detect the prevalence of breastfeeding in newborns with CDH and EA at different time points. METHODS: We performed an epidemiological study and retrospective survey on the prevalence of breastfeeding in CDH and EA affected newborns. We identified 40 CDH and 25 EA newborns who were fed through breastfeeding procedures according to WHO categorized definitions, and compared the breastfeeding procedures at the beginning of hospitalization and at three months of life. RESULTS: Although all the mothers attempted breastfeeding after birth, only 44 (67.7%) were still breastfeeding at the time of discharge. Exclusive breastfeeding was successful for only 19 (29%) mothers. The rate of exclusive breastfeeding at three months of life did not differ statistically from discharge and between the two groups of study. CONCLUSION: A large percentage of mothers of children with CDH and EA who breastfed at the beginning of hospitalization did not continue at three months. It would be important to increase the breastfeeding rate in CDH and EA affected newborns by following specific steps for vulnerable infants and sustaining breastfeeding after discharge.


Assuntos
Aleitamento Materno , Atresia Esofágica/epidemiologia , Hérnias Diafragmáticas Congênitas/epidemiologia , Feminino , Humanos , Lactente , Recém-Nascido , Itália/epidemiologia , Masculino , Leite Humano , Mães/psicologia , Prevalência , Estudos Retrospectivos
8.
J Clin Invest ; 101(10): 2119-28, 1998 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-9593768

RESUMO

Ex vivo gene therapy of primary myopathies, based on autologous transplantation of genetically modified myogenic cells, is seriously limited by the number of primary myogenic cells that can be isolated, expanded, transduced, and reimplanted into the patient's muscles. We explored the possibility of using the MyoD gene to induce myogenic conversion of nonmuscle, primary cells in a quantitatively relevant fashion. Primary human and murine fibroblasts from skin, muscle, or bone marrow were infected by an E1-deleted adenoviral vector carrying a retroviral long terminal repeat-promoted MyoD cDNA. Expression of MyoD caused irreversible withdrawal from the cell cycle and myogenic differentiation in the majority (from 60 to 90%) of cultured fibroblasts, as defined by activation of muscle-specific genes, fusion into contractile myotubes, and appearance of ultrastructurally normal sarcomagenesis in culture. 24 h after adenoviral exposure, MyoD-converted cultures were injected into regenerating muscle of immunodeficient (severe combined immunodeficiency/beige) mice, where they gave rise to beta-galactosidase positive, centrally nucleated fibers expressing human myosin heavy chains. Fibers originating from converted fibroblasts were indistinguishable from those obtained by injection of control cultures of lacZ-transduced satellite cells. MyoD-converted murine fibroblasts participated to muscle regeneration also in immunocompetent, syngeneic mice. Although antibodies from these mice bound to adenoviral infected cells in vitro, no inflammatory infiltrate was present in the graft site throughout the 3-wk study period. These data support the feasibility of an alternative approach to gene therapy of primary myopathies, based on implantation of large numbers of genetically modified primary fibroblasts massively converted to myogenesis by adenoviral delivery of MyoD ex vivo.


Assuntos
Adenoviridae/genética , Técnicas de Transferência de Genes , Vetores Genéticos/genética , Desenvolvimento Muscular , Proteína MyoD/genética , Animais , Diferenciação Celular , DNA Viral/genética , Fibroblastos , Expressão Gênica/genética , Terapia Genética/métodos , Humanos , Imuno-Histoquímica , Camundongos , Camundongos SCID , Músculos/citologia , Músculos/ultraestrutura , Distrofias Musculares/genética , Distrofias Musculares/terapia , Cadeias Pesadas de Miosina/metabolismo , RNA Mensageiro/análise , Regeneração/fisiologia
9.
Eur J Clin Nutr ; 61(10): 1213-9, 2007 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17299491

RESUMO

OBJECTIVE: To evaluate the prevalence of beta(3)-adrenergic receptor (ADRB3) Trp64Arg polymorphism and its relationship with the metabolic syndrome in severe obesity. DESIGN: Cross-sectional outpatients study. PATIENTS AND METHODS: In 265 (100 men) severely obese non-diabetic subjects and 78 (25 men) healthy volunteers, genomic DNA was isolated from peripheral leukocytes. In obese patients, plasma concentrations of leptin, lipids, glucose and insulin, the homeostasis model assessment index and blood pressure have been measured. The Trp64Arg mutation was identified with the real-time TaqMan method. RESULTS: Neither genotype distribution nor allele frequency differed between the two groups. The metabolic syndrome prevalence was 59% in obese subjects, and was higher in men than in women (65 vs 55%: P=0.03). The body mass index (BMI) was related to age tertiles (beta=0.08; P<0.001; multiple linear regression) in Trp64Arg-positive obese subjects. CONCLUSION: We confirm the high prevalence of the metabolic syndrome among severely obese subjects. ADRB3 polymorphism was significantly related to insulin resistance only in obese male subjects. Moreover, increased BMI was related to age in obese subjects with the ADRB3 polymorphism.


Assuntos
Síndrome Metabólica/genética , Obesidade Mórbida/complicações , Polimorfismo Genético , Receptores Adrenérgicos beta 3/genética , Adulto , Fatores Etários , Glicemia/análise , Índice de Massa Corporal , Estudos Transversais , Feminino , Frequência do Gene , Predisposição Genética para Doença , Genótipo , Humanos , Insulina/sangue , Itália/epidemiologia , Leptina/sangue , Leucócitos/metabolismo , Modelos Lineares , Lipídeos/sangue , Masculino , Síndrome Metabólica/epidemiologia , Mutação , Obesidade Mórbida/sangue , Obesidade Mórbida/genética , Fatores Sexuais
10.
Bone Joint Res ; 6(8): 481-488, 2017 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28790037

RESUMO

OBJECTIVES: Intramedullary fixation is considered the most stable treatment for pertrochanteric fractures of the proximal femur and cut-out is one of the most frequent mechanical complications. In order to determine the role of clinical variables and radiological parameters in predicting the risk of this complication, we analysed the data pertaining to a group of patients recruited over the course of six years. METHODS: A total of 571 patients were included in this study, which analysed the incidence of cut-out in relation to several clinical variables: age; gender; the AO Foundation and Orthopaedic Trauma Association classification system (AO/OTA); type of nail; cervical-diaphyseal angle; surgical wait times; anti-osteoporotic medication; complete post-operative weight bearing; and radiological parameters (namely the lag-screw position with respect to the femoral head, the Cleveland system, the tip-apex distance (TAD), and the calcar-referenced tip-apex distance (CalTAD)). RESULTS: The incidence of cut-out across the sample was 5.6%, with a higher incidence in female patients. A significantly higher risk of this complication was correlated with lag-screw tip positioning in the upper part of the femoral head in the anteroposterior radiological view, posterior in the latero-lateral radiological view, and in the Cleveland peripheral zones. The tip-apex distance and the calcar-referenced tip-apex distance were found to be highly significant predictors of the risk of cut-out at cut-offs of 30.7 mm and 37.3 mm, respectively, but the former appeared more reliable than the latter in predicting the occurrence of this complication. CONCLUSION: The tip-apex distance remains the most accurate predictor of cut-out, which is significantly greater above a cut-off of 30.7 mm.Cite this article: G. Caruso, M. Bonomo, G. Valpiani, G. Salvatori, A. Gildone, V. Lorusso, L. Massari. A six-year retrospective analysis of cut-out risk predictors in cephalomedullary nailing for pertrochanteric fractures: Can the tip-apex distance (TAD) still be considered the best parameter?. Bone Joint Res 2017;6:481-488. DOI: 10.1302/2046-3758.68.BJR-2016-0299.R1.

11.
Int J Artif Organs ; 29(2): 187-96, 2006 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-16552666

RESUMO

A case of refractory fluid overload due to congestive heart failure and consequent renal insufficiency is reported. The case was approached multidisciplinarily, at the beginning with conservative and pharmacological therapy, subsequently with extracorporeal fluid removal in which a specific attention was payed to the maintenance of circulating blood volume and achievement of dry weight, and finally with chronic peritoneal dialysis as a maintenance therapy. The case seems to summarize the pathway of many patients seen initially in intensive care and cardiology departments and subsequently in nephrological wards.


Assuntos
Líquidos Corporais , Insuficiência Cardíaca/complicações , Hemofiltração , Insuficiência Renal/terapia , Idoso , Cuidados Críticos , Humanos , Masculino , Diálise Peritoneal , Insuficiência Renal/etiologia
12.
Transplant Proc ; 37(7): 3226-9, 2005 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-16213354

RESUMO

Transplant patient plasma produces an increased rate of mononuclear cell apoptosis despite a normal serum creatinine value. Immunosuppressive medications may be one factor that causes an altered apoptotic pattern. We evaluated the in vitro effects of various doses of cyclosporine, mycophenolate mofetil, and steroids on apoptosis of a cultured human monocytic U937 cell line, using estimates by fluorescence microscopy and annexin V assays. Increasing cyclosporine concentrations (100 to 800 ng/mL) progressively increased apoptosis rates (16% to 32%). The combination of steroid (0.01 microg/mL) and cyclosporine increased the apoptosis rate to 45%. Mycophenolate mofetil alone (0.3 microg/mL) led to an apoptosis rate of 34%. Therapeutic levels of mycophenolate mofetil from 3 to 7 microg/mL led to apoptosis rates from 56% to 67%. The combination of cyclosporine, steroid, and mycophenolate mofetil increased the rate of apoptosis to 95%. Immunosuppressive therapy may contribute to the high rate of apoptosis observed among mononuclear cells of transplanted patients. This effect may alter patient susceptibility to infections and contribute to a unique mechanism of immunosuppression.


Assuntos
Apoptose/efeitos dos fármacos , Ciclosporina/farmacologia , Ácido Micofenólico/análogos & derivados , Anexina A5/metabolismo , Linhagem Celular Tumoral , Relação Dose-Resposta a Droga , Humanos , Ácido Micofenólico/farmacologia , Esteroides/farmacologia , Células U937
13.
Meat Sci ; 71(3): 557-62, 2005 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22060933

RESUMO

The present study was undertaken to evaluate the effect of age on lipid content and composition of lamb meat. Thirty suckling ram lambs of the Italian Merino breed, reared according to a traditional semi-extensive management, were slaughtered at 30, 50 and 70 days of age to evaluate total lipids and fatty acid profile in three different muscles: longissimus dorsi (LD), semimembranosus (SM) and quadriceps femoris (QF). Age did not dramatically modify lipid content and composition, even if effects of nutritional interest were observed. Meat from lambs slaughtered at 70 days of age presented the best fatty acid profile, because they had the highest PUFA content and ratio to SFA, as well as the lowest thrombogenic index. The SM muscle had better nutritional quality than the LD and the QF, as a result of a higher PUFA percentage and PUFA/SFA ratio, together with a lower thrombogenic index. These characteristics were also associated with slightly lower amounts of intramuscular lipids and SFA.

14.
Anesteziol Reanimatol ; (2): 87-91, 2005.
Artigo em Russo | MEDLINE | ID: mdl-15938108

RESUMO

Sepsis is the leading cause of disability and mortality among critical patients; moreover, it causes high economic expenditures. Although very much is known about the pathophysiology of this condition and its mediators despite great investments directed to its control, mortality rates remain high. Recent treatment manuals emphasize the value of early goal-oriented therapy and also point to the high efficacy of activated protein C. Extracorporeal blood clearance may potentially become a new approach to treating this condition. There are reports on its positive clinical results that are likely associated with the effective removal of septic mediators. Human and animal studies, few and rather alike as they are, have yielded promising results. It is evident that the use of these procedures is justified; however, their efficiency in sepsis requires large-scale, correctly conducted studies.


Assuntos
Circulação Extracorpórea/métodos , Sepse/terapia , Desintoxicação por Sorção/métodos , Humanos
15.
Int J Dev Biol ; 44(6): 699-706, 2000.
Artigo em Inglês | MEDLINE | ID: mdl-11061434

RESUMO

In amniotes, myogenic commitment appears to be dependent upon signaling from neural tube and dorsal ectoderm, that can be replaced by members of the Wnt family and by Sonic hedgehog. Once committed, myoblasts undergo different fates, in that they can differentiate immediately to form the myotome, or later to give rise to primary and secondary muscle fibers. With fiber maturation, satellite cells are first detected; these cells contribute to fiber growth and regeneration during post-natal life. We will describe recent data, mainly from our laboratory, that suggest a different origin for some of the cells that are incorporated into the muscle fibers during late development. We propose the possibility that these myogenic cells are derived from the vasculature, are multi-potent and become committed to myogenesis by local signaling, when ingressing a differentiating muscle tissue. The implications for fetal and perinatal development of the whole mesoderm will also be discussed.


Assuntos
Linhagem da Célula , Mesoderma/metabolismo , Músculos/citologia , Músculos/fisiologia , Transativadores , Proteínas de Peixe-Zebra , Animais , Diferenciação Celular , Embrião de Mamíferos/citologia , Embrião de Mamíferos/metabolismo , Proteínas Hedgehog , Camundongos , Modelos Biológicos , Proteínas/metabolismo , Proteínas Proto-Oncogênicas/metabolismo , Proteínas Wnt
16.
Hum Gene Ther ; 6(6): 733-42, 1995 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-7548273

RESUMO

Genetically modified myogenic cells have a number of potentially relevant applications for gene therapy of genetic defects. Retroviral vectors proved to be a safe and efficient tool to transfer and express genes into satellite cells and their differentiated progeny, although muscle-specific regulation of the transferred gene is very difficult to achieve in a conventional vector framework. We modified a Moloney murine leukemia virus (MoMLV)-derived retroviral vector containing a bacterial beta-galactosidase (beta-Gal) reporter gene by inserting a muscle creatinine kinase (MCK) enhancer element into the U3 region of the viral long terminal repeat (LTR). The resulting vector (mLBSN) was transferred into cells of different histological origin, including undifferentiated murine and human myogenic cells, which were unable to express the transgene at detectable levels. Instead, gene expression from the modified LTR was obtained in a mouse myogenic cell line and in human primary satellite cells upon induction of differentiation into myotubes in culture, and correlated with the activation of the muscle differentiation program. beta-Gal-negative, mLBSN-transduced human satellite cells were also transplanted into the quadricep muscle of immunodeficient mice, where activation of the transgene expression was observed in vivo after differentiation and fusion into muscle fibers. These results show that retroviral vectors carrying LTRs modified in the enhancer sequences may be used to target tissue- and differentiation-specific gene expression into the muscle. For practical purposes, satellite cells engineered by muscle-specific retroviral vectors might represent an effective tool to deliver expression of a given gene product specifically into the muscle tissue, avoiding undesired protein accumulation in mononucleated cells. More generally, this type of vector might be useful whenever regulated expression of a transferred gene is necessary in a target cell or tissue.


Assuntos
Elementos Facilitadores Genéticos , Regulação Viral da Expressão Gênica/genética , Vetores Genéticos , Vírus da Leucemia Murina de Moloney/genética , Músculo Esquelético/metabolismo , Animais , Diferenciação Celular , Linhagem Celular , Transplante de Células , Creatina Quinase/genética , Humanos , Camundongos , Camundongos Nus , Músculo Esquelético/citologia , Músculo Esquelético/enzimologia
17.
Hum Gene Ther ; 4(6): 713-23, 1993 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-8186286

RESUMO

Primary human myogenic cells isolated from fetal and adult muscle were infected with a high-titer, Moloney murine leukemia virus (MoMLV)-derived retroviral vector expressing a bacterial beta-galactosidase (beta-gal) gene under long terminal repeat (LTR) control. Gene transfer efficiency averaged 50% in both fetal myoblasts and adult satellite cells, as revealed by beta-gal staining. The reporter gene was stably integrated, faithfully inherited, and expressed at significant levels in myogenic cells for at least 10 generations under clonal growth conditions, and throughout the culture life span upon differentiation into myotubes. Comparable gene transfer efficiency was obtained in myogenic cells from muscle biopsies of patients affected by a number of genetic or acquired myopathies, including Duchenne muscular dystrophy. Transduced normal human satellite cells were injected into regenerating muscle of immunodeficient mice, where they formed new muscle fibers in which the product of the reporter gene was detectable for 2 months after injection. These results show that retroviral vectors can be used to transfer foreign genes with high efficiency into normal or abnormal primary human myogenic cells, leading to stable expression into mature muscle. Satellite cells engineered in this way might represent an effective tool for gene therapy of muscular dystrophies as well as for systemic delivery of recombinant gene products for correction of inherited and acquired disorders. The human-mouse model described here will allow in vivo testing of such gene therapy approaches.


Assuntos
Técnicas de Transferência de Genes , Vetores Genéticos , Vírus da Leucemia Murina de Moloney/genética , Músculos/metabolismo , Adolescente , Adulto , Idoso , Animais , Diferenciação Celular , Transplante de Células , Células Cultivadas , Criança , Células Clonais , Feminino , Terapia Genética , Genoma Viral , Humanos , Hospedeiro Imunocomprometido , Masculino , Camundongos , Camundongos Nus , Pessoa de Meia-Idade , Músculos/citologia , Músculos/embriologia , Doenças Musculares/terapia , Provírus/genética , Integração Viral , beta-Galactosidase/genética
18.
Hum Gene Ther ; 10(10): 1607-17, 1999 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-10428206

RESUMO

Myogenic cells have a limited life span in culture, which prevents expansion at clinically relevant levels, and seriously limits any potential use in cell replacement or ex vivo gene therapy. We developed a strategy for reversibly immortalizing human primary myogenic cells, based on retrovirus-mediated integration of a wild-type SV40 large-T antigen (Tag), excisable by means of the Cre-Lox recombination system. Myogenic cells were transduced with a vector (LTTN-LoxP) expressing the SV40 Tag under the control of an LTR modified by the insertion of a LoxP site in the U3 region. Clonal isolates of Tag-positive cells showed modified growth characteristics and a significantly extended life span, while maintaining a full myogenic potential. Transient expression of Cre recombinase, delivered by transfection or adenoviral vector transduction, allowed excision of the entire provirus with up to >90% efficiency. Cultures of Cre-treated (Tag-) or untreated (Tag+) myogenic cells were genetically labeled with a lacZ retroviral vector, and injected into the regenerating muscle of SCID/bg immunodeficient mice. Tag- cells underwent terminal differentiation in vivo, giving rise to clusters of beta-Gal+ hybrid fibers with an efficiency comparable to that of control untransduced cells. Tag+ cells could not be detected after injection. Neither Tag+ nor Tag- cells formed tumor in this xenotransplantation model. Reversible immortalization by Tag therefore allows the expansion of primary myogenic cells in culture without compromising their ability to differentiate in vivo, and could represent a safe method by which to increase the availability of these cells for clinical application.


Assuntos
Antígenos Transformantes de Poliomavirus/genética , Técnicas de Transferência de Genes , Vetores Genéticos , Integrases , Vírus da Leucemia Murina de Moloney , Proteínas Virais , Células 3T3 , Adulto , Animais , Diferenciação Celular , Divisão Celular , Transformação Celular Viral , Células Cultivadas , Pré-Escolar , Humanos , Camundongos , Músculos/citologia , Oncogenes
19.
Acta Trop ; 83(2): 159-68, 2002 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12088857

RESUMO

We report here the evaluation of an antigen from Taenia crassiceps cysticercus as a potential reagent in an enzyme-immunoelectrotransfer blotting assay (EITB) and an enzyme-linked immunosorbent assay (ELISA) for the serodiagnosis of neurocysticercosis (NC) using clinical specimens obtained from patients in different phases of the disease. Serum and cerebrospinal fluid (CSF) samples from 64 patients suspected of having NC according to clinical manifestation and brain computed tomography were tested by ELISA with Taenia solium total saline antigen (ELISA-Tso) and by immunoblotting with T. crassiceps glycoproteins antigen (EITB-gpTcra). Forty-five serum samples were also tested immunoblotting with T. solium glycoproteins antigen (EITB-gpTso) and 30 were tested by ELISA with T. crassiceps 14 kDa glycoprotein (ELISA-gp14Tcra). Serum samples from apparently healthy individuals without any parasitic disease and from patients with other parasitic diseases were included as controls. The results of ELISA-Tso analysis with CSF obtained from 64 patients with NC showed that 53 (83%) were reactive. EITB-gpTcra analysis with serum from the same group of patients showed a sensitivity of 91%. Results of EITB-gpTso and EITB-gpTcra analysis with serum samples demonstrated an agreement of 100% between both tests. ELISA-gp14Tcra was positive in 23 (77%) sera, 22 with paired CSF positive. When ELISA-gp14Tcra results were compared to EITB-Tso results, a relative sensitivity of 95% was observed. All serum samples from the control group were negative in ELISA-gp14Tcra and only one serum from an individual with Taenia saginata was reactive in this assay, showing a specificity of 99% for ELISA-gp14Tcra. This fraction was purified in only one step with a good yield for use in immunoassays. We suggest that the gp14Tcra antigen can be used for detecting anti-cysticercus antibodies in serum samples for epidemiological investigation purposes and also for diagnostic screening of NC patients.


Assuntos
Antígenos de Helmintos , Neurocisticercose/diagnóstico , Taenia/imunologia , Animais , Anticorpos Anti-Helmínticos/sangue , Brasil , Estudos de Casos e Controles , Ensaio de Imunoadsorção Enzimática/métodos , Humanos , Neurocisticercose/sangue
20.
Acta Diabetol ; 41(1): 18-24, 2004 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-15057550

RESUMO

Anorectic patients who achieve complete recovery from the eating disorder can obtain a favorable psychosocial outcome but the long-term nutritional outcome is ill-defined. We investigated the time course of total and distrectual body composition during and after refeeding in 32 female patients with anorexia nervosa. Patients were enrolled at their lowest weight (T0) and re-examinated after a 15% weight gain (at a mean of 3 months, T1; n=17) and after 3 years of stable weight recovery (T2; n=8). At T2 patients were compared to a control group of 8 healthy females matched for age and body mass index. All subjects underwent dual X-ray absorptiometry and anthropometry at each visit. At T0, the 32 subjects were at 61%+/-8% of ideal body weight (IBW) with severe reductions in fat mass (FM; 7.1%+/-4.5%), fat free mass (FFM) and bone mineral content (BMC). At T2, the 8 subjects had gained 40% of initial weight, but remained at 85.1%+/-7.7% of IBW ( p<0.01 vs. controls), with a percent FM comparable to that of controls and an absolute FFM still deficient. BMC did not improve at T2 and remained 79% of that in controls. FM depletion was more severe in the limbs than in the trunk and at T2 the trunk/limb FM ratio remained greater than that in controls. These data strongly suggest that continued nutritional surveillance and support is necessary throughout these patients' lives, even after correction of the psychiatric illness and of severe underweight.


Assuntos
Anorexia Nervosa/dietoterapia , Anorexia Nervosa/reabilitação , Aumento de Peso/fisiologia , Índice de Massa Corporal , Densidade Óssea , Comportamento Alimentar , Feminino , Humanos , Fatores de Tempo
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