Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 32
Filtrar
1.
Diabetes Res Clin Pract ; 213: 111743, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38878867

RESUMO

AIMS: An initiative of continuous monitoring of the quality of diabetes care, promoted by the Association of Medical Diabetologists, is in place in Italy since 2006 (AMD Annals). The initiative was effective in improving quality of care indicators, assessed periodically through standardized measures. Here, we show the 2023 AMD Annals data on type 2 (T2D) and type 1 (T1D) diabetes. METHODS: A network of over 1/3 of diabetes centers in Italy periodically extracts anonymous data from electronic medical records, using a standardized software. Process, treatment and outcome indicators, and a validated score of overall care, the Q-score, were evaluated. RESULTS: 296 centers provided data on 573,164 T2D (mean age 69.7 ± 11.2 years) and 42,611 T1D subjects (mean age 48.6 ± 16.9 years). A HbA1c value ≤ 7.0 % was documented in 56.3 % of patients with T2D and 35.9 % of those with T1D. Only 6.6 % of T2D patients and 3.5 % of those with T1D reached the composite outcome of HbA1c ≤ 7.0 % + LDL-C < 70 mg/dl + BP < 130/80 mmHg. Notably, only 2.8 % and 3.2 % of T2D and T1D patients, respectively, showed a Q score < 15, which correlates with an 80 % higher risk of incident CVD events compared to scores > 25. CONCLUSIONS: We documented an overall good quality of care in both T1D and T2D subjects. However, the failure to achieve the targets of the main risk factors, especially if combined, in a still too large proportion of patients testify the difficulty to apply the more and more stringent indications recommended by guidelines in the everyday clinical practice.


Assuntos
Diabetes Mellitus Tipo 1 , Diabetes Mellitus Tipo 2 , Qualidade da Assistência à Saúde , Humanos , Diabetes Mellitus Tipo 2/terapia , Diabetes Mellitus Tipo 2/epidemiologia , Idoso , Pessoa de Meia-Idade , Diabetes Mellitus Tipo 1/terapia , Diabetes Mellitus Tipo 1/epidemiologia , Feminino , Masculino , Itália/epidemiologia , Hemoglobinas Glicadas/análise , Hemoglobinas Glicadas/metabolismo , Adulto , Idoso de 80 Anos ou mais
3.
J Endocrinol Invest ; 47(8): 2087-2096, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38441838

RESUMO

AIMS: Opportunities and needs for starting insulin therapy in Type 2 diabetes (T2D) have changed overtime. We evaluated clinical characteristics of T2D subjects undergoing the first insulin prescription during a 15-year-observation period in the large cohort of the AMD Annals Initiative in Italy. METHODS: Data on clinical and laboratory variables, complications and concomitant therapies and the effects on glucose control after 12 months were evaluated in T2D patients starting basal insulin as add-on to oral/non-insulin injectable agents, and in those starting fast-acting in add-on to basal insulin therapy in three 5-year periods (2005-2019). RESULTS: We evaluated data from 171.688 T2D subjects who intensified therapy with basal insulin and 137.225 T2D patients who started fast-acting insulin. Overall, intensification with insulin occurred progressively earlier over time in subjects with shorter disease duration. Moreover, the percentage of subjects with HbA1c levels > 8% at the time of basal insulin initiation progressively decreased. The same trend was observed for fast-acting formulations. Clinical characteristics of subjects starting insulin did not change in the three study-periods, although all major risk factors improved overtime. After 12 months from the starting of basal or fast-acting insulin therapy, mean HbA1c levels decreased in all the three investigated time-periods, although mean HbA1c levels remained above the recommended target. CONCLUSIONS: In this large cohort of T2D subjects, a progressively earlier start of insulin treatment was observed during a long observation period, suggesting a more proactive prescriptive approach. However, after 12 months from insulin prescription, in many patients, HbA1c levels were still out-of-target.


Assuntos
Glicemia , Diabetes Mellitus Tipo 2 , Hipoglicemiantes , Insulina , Humanos , Diabetes Mellitus Tipo 2/tratamento farmacológico , Diabetes Mellitus Tipo 2/sangue , Diabetes Mellitus Tipo 2/epidemiologia , Feminino , Masculino , Itália/epidemiologia , Hipoglicemiantes/administração & dosagem , Hipoglicemiantes/uso terapêutico , Pessoa de Meia-Idade , Insulina/administração & dosagem , Insulina/uso terapêutico , Idoso , Glicemia/análise , Glicemia/metabolismo , Glicemia/efeitos dos fármacos , Hemoglobinas Glicadas/análise , Seguimentos , Fatores de Tempo
4.
J Endocrinol Invest ; 47(10): 2595-2602, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-38436903

RESUMO

BACKGROUND: Cardiovascular disease is the leading cause of morbidity and mortality among patients with diabetes, and for this reason, all guidelines for CV risk management provide the same targets in controlling traditional CV risk factors in patients with type 1 or type 2 diabetes at equal CV risk class. Aim of our study was to evaluate and compare CV risk management in patients with type 1 and type 2 diabetes included in AMD Annals Database paying particular attention to indicators of clinical inertia. METHODS: This was a multicenter, observational, retrospective study of AMD Annals Database during year 2022. Patients with diabetes were stratified on the basis of their cardiovascular risk, according to ESC-EASD guidelines. The proportion of patients not treated with lipid-lowering despite LDL cholesterol > to 100 mg/dl or the proportion of patients not treated with antihypertensive drug despite BP > 140/90 mmhg and proportion of patients with proteinuria not treated with angiotensin converting enzyme inhibitors or angiotensinogen receptor blockers (ACE/ARBs) were considered indicators of clinical inertia. The proportion of patients reaching at the same time HbA1c < 7% LDL < 70 mg/dl and BP < 130/80 mmhg were considered to have good multifactorial control. Overall quality of health care was evaluated by the Q-score. RESULTS: Using the inclusion criteria and stratifying patients by ESC/EASD Cardiovascular Risk categories, we included in the analysis 118.442 patients at High Cardiovascular risk and 416.246 patients at Very High Cardiovascular risk. The proportion of patients with good multifactorial risk factor control was extremely low in both T1D and T2D patients in each risk class. At equal risk class, the patients with T1D had lower proportion of subjects reaching HbA1c, LDL, or Blood Pressure targets. Indicators of clinical inertia were significantly higher compared with patients with T2D at equal risk class. Data regarding patients with albuminuria not treated with RAAS inhibitors were available only for those at Very High risk and showed that the proportion of patients not treated was again significantly higher in patients with T1DM. CONCLUSIONS: In conclusion, this study provides evidence of wide undertreatment of traditional cardiovascular risk factors among patients with diabetes included in AMD Annals Database. Undertreatment seems to be more pronounced in individuals with T1D compared to those with T2D and is frequently due to clinical inertia.


Assuntos
Doenças Cardiovasculares , Diabetes Mellitus Tipo 1 , Diabetes Mellitus Tipo 2 , Fatores de Risco de Doenças Cardíacas , Qualidade da Assistência à Saúde , Humanos , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/tratamento farmacológico , Masculino , Doenças Cardiovasculares/etiologia , Doenças Cardiovasculares/prevenção & controle , Doenças Cardiovasculares/epidemiologia , Feminino , Estudos Retrospectivos , Diabetes Mellitus Tipo 1/complicações , Diabetes Mellitus Tipo 1/tratamento farmacológico , Pessoa de Meia-Idade , Qualidade da Assistência à Saúde/normas , Idoso , Fatores de Risco
5.
Diabetes Res Clin Pract ; 199: 110672, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37084893

RESUMO

AIMS: Since 2006, the Italian AMD (Associations of Medical Diabetologists) Annals Initiative promoted a continuous monitoring of the quality of diabetes care, that was effective in improving process, treatment and outcome indicators through a periodic assessment of standardized measures. Here, we show the 2022 AMD Annals data on type 2 diabetes (T2D). METHODS: A network involving ∼1/3 of diabetes centers in Italy periodically extracts anonymous data from electronic clinical records, by a standardized software. Process, treatment and outcome indicators, and a validated score of overall care, the Q-score, were evaluated. RESULTS: 295 centers provided the annual sample of 502,747 T2D patients. Overall, HbA1c value ≤7.0% was documented in 54.6% of patients, blood pressure <130/80 mmHg in 23.0%, and LDL-cholesterol levels <70 mg/dl in 34.3%, but only 5.2% were at- target for all the risk factors. As for innovative drugs, 29.0% of patients were on SGLT2-i, and 27.5% on GLP1-RAs. In particular, 59.7% were treated with either GLP1-RAs or SGLT2-i among those with established cardiovascular disease (CVD), 26.6% and 49.3% with SGLT2-i among those with impaired renal function and heart failure, respectively. Notably, only 3.2% of T2D patients showed a Q score <15, which correlates with a 80% higher risk of incident CVD events compared to scores >25. CONCLUSIONS: The 2022 AMD Annals data show an improvement in the use of innovative drugs and in the overall quality of T2D care in everyday clinical practice. However, additional efforts are needed to reach the recommended targets for HbA1c and major CVD risk factors.


Assuntos
Doenças Cardiovasculares , Diabetes Mellitus Tipo 2 , Humanos , Diabetes Mellitus Tipo 2/tratamento farmacológico , Transportador 2 de Glucose-Sódio/uso terapêutico , Hemoglobinas Glicadas , Fatores de Risco
6.
Diabetes Res Clin Pract ; 192: 110092, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36167264

RESUMO

OBJECTIVE: To develop and validate a model for predicting 5-year eGFR-loss in type 2 diabetes mellitus (T2DM) patients with preserved renal function at baseline. RESEARCH DESIGN AND METHODS: A cohort of 504.532 T2DM outpatients participating to the Medical Associations of Diabetologists (AMD) Annals Initiative was splitted into the Learning and Validation cohorts, in which the predictive model was respectively developed and validated. A multivariate Cox proportional hazard regression model including all baseline characteristics was performed to identify predictors of eGFR-loss. A weight derived from regression coefficients was assigned to each variable and the overall sum of weights determined the 0 to 8-risk score. RESULTS: A set of demographic, clinical and laboratory parameters entered the final model. The eGFR-loss score showed a good performance in the Validation cohort. Increasing score values progressively identified a higher risk of GFR loss: a score ≥ 8 was associated with a HR of 13.48 (12.96-14.01) in the Learning and a HR of 13.45 (12.93-13.99) in the Validation cohort. The 5 years-probability of developing the study outcome was 55.9% higher in subjects with a score ≥ 8. CONCLUSIONS: In the large AMD Annals Initiative cohort, we developed and validated an eGFR-loss prediction model to identify T2DM patients at risk of developing clinically meaningful renal complications within a 5-years time frame.


Assuntos
Diabetes Mellitus Tipo 2 , Humanos , Diabetes Mellitus Tipo 2/complicações , Taxa de Filtração Glomerular , Rim , Fatores de Risco , Estudos de Coortes
7.
Nanotechnology ; 33(5)2021 Nov 12.
Artigo em Inglês | MEDLINE | ID: mdl-34678792

RESUMO

Nitrogen-doping of cadmium sulfide nanostructured compounds was carried out under a nitrogen plasma source to produce CdS-N compounds. Once prepared, it was supported on graphene oxide sheets for producing CdS-N/GO photocatalysts, which were tested in the degradation of lignin and methylene blue (MB) molecules. Photocatalytic reactions were carried out under UV and visible (vis) energy irradiation. To provide insight on the catalytic behavior the CdS, CdS-N, GO, and CdS-N/GO compounds were characterized using different techniques including x-ray diffraction, scanning electron microscopy, Raman, and UV-vis diffuse reflectance spectroscopy. X-ray photoelectron spectroscopy allowed determining the chemical composition in samples. It was observed an outstanding performance in photocatalytic activity tests, attributed to the extended response towards the visible light regime, and the synergistic effect between CdS-N and GO particles. The catalytic activity tests, reveal that the CdS-N/GO compound achieved over 90% lignin degradation and 100% of MB degradation. In addition, a remarkable performance is observed in the CdS-N/GO compound which exhibited stability after performing several reaction cycles.

8.
ESMO Open ; 6(3): 100155, 2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-34020401

RESUMO

Pancreatic cancer (PC) is a common cause of cancer-related death, due to difficulties in detecting early-stage disease, to its aggressive behaviour, and to poor response to systemic therapy. Therefore, developing strategies for early diagnosis of resectable PC is critical for improving survival. Diabetes mellitus is another major public health problem worldwide. Furthermore, diabetes can represent both a risk factor and a consequence of PC: nowadays, the relationship between these two diseases is considered a high priority for research. New-onset diabetes can be an early manifestation of PC, especially in a thin adult without a family history of diabetes. However, even if targeted screening for patients at higher risk of PC could be a promising approach, this is not recommended in asymptomatic adults with new-onset diabetes, due to the much higher incidence of hyperglycaemia than PC and to the lack of a safe and affordable PC screening test. Prompted by a well-established and productive multidisciplinary cooperation, the Italian Association of Medical Oncology (AIOM), the Italian Medical Diabetologists Association (AMD), the Italian Society of Endocrinology (SIE), and the Italian Society of Pharmacology (SIF) here review available evidence on the mechanisms linking diabetes and PC, addressing the feasibility of screening for early PC in patients with diabetes, and sharing a set of update statements with the aim of providing a state-of-the-art overview and a decision aid tool for daily clinical practice.


Assuntos
Diabetes Mellitus , Neoplasias Pancreáticas , Médicos , Consenso , Diabetes Mellitus/diagnóstico , Diabetes Mellitus/epidemiologia , Humanos , Oncologia , Neoplasias Pancreáticas/diagnóstico , Neoplasias Pancreáticas/epidemiologia
9.
ESMO Open ; 6(3): 100153, 2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-33984679

RESUMO

Most anticancer molecules are administered in body-size-based dosing schedules, bringing up unsolved issues regarding pharmacokinetic data in heavy patients. The worldwide spread of obesity has not been matched by improved methods and strategies for tailored drug dosage in this population. The weight or body surface area (BSA)-based approaches may fail to fully reflect the complexity of the anthropometric features besides obesity in cancer patients suffering from sarcopenia. Likewise, there is a lack of pharmacokinetic data on obese patients for the majority of chemotherapeutic agents as well as for new target drugs and immunotherapy. Therefore, although the available findings point to the role of dose intensity in cancer treatment, and support full weight-based dosing, empirical dose capping often occurs in clinical practice in order to avoid toxicity. Thus a panel of experts of the Associazione Italiana Oncologia Medica (AIOM), Associazione Medici Diabetologi (AMD), Società Italiana Endocrinologia (SIE), and Società Italiana Farmacologia (SIF), provides here a consensus statement for appropriate cytotoxic chemotherapy and new biological cancer drug dosing in obese patients.


Assuntos
Antineoplásicos , Neoplasias , Médicos , Consenso , Humanos , Neoplasias/complicações , Neoplasias/tratamento farmacológico , Obesidade/complicações
10.
Int J Bioprint ; 5(2): 189, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-32954039

RESUMO

Alginate is a biocompatible material suitable for biomedical applications, which can be processed under mild conditions on irradiation. This paper investigates the preparation and the rheological behavior of different pre-polymerized and polymerized alginate methacrylate systems for three-dimensional photopolymerization bioprinting. The effect of the functionalization time on the mechanical, morphological, swelling, and degradation characteristics of cross-linked alginate hydrogel is also discussed. Alginate was chemically-modified with methacrylate groups and different reaction times considered. Photocurable alginate systems were prepared by dissolving functionalized alginate with 0.5- 1.5% w/v photoinitiator solutions and cross-linked by ultraviolet light (8 mW/cm2 for 8 minutes).

13.
Nutr Metab Cardiovasc Dis ; 26(10): 879-85, 2016 10.
Artigo em Inglês | MEDLINE | ID: mdl-27212622

RESUMO

BACKGROUND AND AIMS: Diabetic women have a more adverse plasma lipid profile than men. Sex differences in dietary habits may play a role, but are little investigated. The study evaluates the quality of diet, adherence to the nutritional recommendations of the Diabetes and Nutrition Study Group and their relation with plasma lipid in men and women with diabetes. METHODS AND RESULTS: We studied 2573 people, aged 50-75, enrolled in the TOSCA.IT study (clinicaltrials.gov; NCT00700856). Plasma lipids were measured centrally. Diet was assessed with a semi-quantitative food frequency questionnaire. Women had a more adverse plasma lipid profile than men. Women consumed significantly more legumes, vegetables, fruits, eggs, milk, vegetable oils, and added sugar, whereas men consumed more starchy foods, soft drinks and alcoholic beverages. This stands for a higher proportion (%) of energy intake from saturated fat and added sugar (12.0 ± 2.4 vs 11.5 ± 2.5 and 3.4 ± 3.2 vs 2.3 ± 3.2, P < 0.04), and a higher intake of fiber (11.2 ± 2.8 vs 10.4 ± 2.6 g/1000 Kcal/day) in women. Adherence to the recommendations for saturated fat and fiber consumption was associated with significantly lower LDL-cholesterol regardless of sex. Adherence to the recommendations for added sugars was associated with significantly lower triglycerides and higher HDL-cholesterol in men and women. CONCLUSIONS: Men and women with diabetes show significant differences in adherence to nutritional recommendations, but sex differences in plasma lipid profile are unlikely to be explained by nutritional factors. Adherence to the nutritional recommendations is associated with a better plasma lipid profile regardless of sex, thus reinforcing the importance of substituting saturated for unsaturated fat sources, increasing fiber and reducing added sugar intake.


Assuntos
Comportamento de Escolha , Diabetes Mellitus Tipo 2/dietoterapia , Dieta Saudável , Comportamento Alimentar , Lipídeos/sangue , Cooperação do Paciente , Recomendações Nutricionais , Idoso , Biomarcadores/sangue , Diabetes Mellitus Tipo 2/sangue , Diabetes Mellitus Tipo 2/diagnóstico , Diabetes Mellitus Tipo 2/psicologia , Feminino , Preferências Alimentares , Humanos , Itália , Masculino , Pessoa de Meia-Idade , Avaliação Nutricional , Fatores de Risco , Fatores Sexuais , Inquéritos e Questionários , Fatores de Tempo , Resultado do Tratamento
14.
Mater Sci Eng C Mater Biol Appl ; 57: 288-93, 2015 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-26354266

RESUMO

This paper addresses the mechanical characterization of polycaprolactone (PCL)-bioglass (FastOs®BG) composites and scaffolds intended for use in tissue engineering. Tissue engineering scaffolds support the self-healing mechanism of the human body and promote the regrowth of damaged tissue. These implants can dissolve after successful tissue regeneration minimising the immune reaction and the need for revision surgery. However, their mechanical properties should match surrounding tissue in order to avoid strain concentration and possible separation at the interface. Therefore, an extensive experimental testing programme of this advanced material using uni-axial compressive testing was conducted. Tests were performed at low strain rates corresponding to quasi-static loading conditions. The initial elastic gradient, plateau stress and densification strain were obtained. Tested specimens varied according to their average density and material composition. In total, four groups of solid and robocast porous PCL samples containing 0, 20, 30, and 35% bioglass, respectively were tested. The addition of bioglass was found to slightly decrease the initial elastic gradient and the plateau stress of the biomaterial scaffolds.


Assuntos
Substitutos Ósseos/síntese química , Cerâmica/química , Poliésteres/química , Engenharia Tecidual/instrumentação , Alicerces Teciduais , Força Compressiva , Módulo de Elasticidade , Desenho de Equipamento , Análise de Falha de Equipamento , Dureza , Teste de Materiais , Estresse Mecânico , Resistência à Tração
15.
Res Dev Disabil ; 38: 97-107, 2015 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-25575283

RESUMO

This study was aimed at evaluating the spatial abilities in individuals with Prader-Willi syndrome (PWS) by using an ecological large-scale task with multiple rewards. To evaluate the extent of spatial deficit in PWS individuals, we compare their performances with those of individuals with Williams Syndrome (WS) in which the spatial deficits have been widely described. Participants had to explore an open space to search nine rewards placed in buckets arranged according to three spatial configurations: a Cross, a 3×3 Matrix and a Cluster composed by three groups of three buckets each. PWS individuals exhibited an explorative deficit in Cluster and Cross configurations, while WS participants in Matrix and Cross configurations. The findings indicate that the structural affordances of the environment influence the explorative strategies and can be related to how spatial information is processed.


Assuntos
Comportamento Exploratório , Síndrome de Prader-Willi/psicologia , Percepção Espacial/fisiologia , Memória Espacial/fisiologia , Adolescente , Estudos de Casos e Controles , Criança , Cognição , Feminino , Humanos , Masculino , Testes Neuropsicológicos , Síndrome de Prader-Willi/fisiopatologia , Desempenho Psicomotor , Análise e Desempenho de Tarefas , Síndrome de Williams/fisiopatologia , Síndrome de Williams/psicologia , Adulto Jovem
16.
Brain Struct Funct ; 220(5): 2895-904, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25023735

RESUMO

The environmental enrichment (EE) paradigm is widely used to study experience-dependent brain plasticity. In spite of a long history of research, the EE influence on neuronal morphology has not yet been described in relation to the different regions of the cerebellum. Thus, aim of the present study was to characterize the EE effects on density and size of dendritic spines of Purkinje cell proximal and distal compartments in cerebellar vermian and hemispherical regions. Male Wistar rats were housed in an enriched or standard environment for 3.5 months from the 21st post-natal day onwards. The morphological features of Purkinje cell spines were visualized on calbindin immunofluorescence-stained cerebellar vermian and hemispherical sections. Density, area, length and head diameter of spines were manually (ImageJ) or automatically (Imaris) quantified. Results demonstrated that the Purkinje cell spine density was higher in enriched rats than in controls on both proximal and distal dendrite compartments in the hemisphere, while it increased only on distal compartment in the vermis. As for spine size, a significant increase of area, length and head diameter was found in the distal dendrites in both vermis and hemisphere. Thus, the exposure to a complex environment enhances synapse formation and plasticity either in the vermis involved in balance and locomotion and in the hemisphere involved in complex motor adaptations and acquisition of new motor strategies. These data highlight the importance of cerebellar activity-dependent structural plasticity underling the EE-related high-level performances.


Assuntos
Vermis Cerebelar/citologia , Cerebelo/citologia , Espinhas Dendríticas/fisiologia , Meio Ambiente , Plasticidade Neuronal/fisiologia , Células de Purkinje/citologia , Animais , Dendritos/fisiologia , Masculino , Ratos Wistar
17.
Stem Cells Int ; 2014: 376918, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25379040

RESUMO

Skeletal muscle has good regenerative capacity, but the extent of muscle injury and the developed fibrosis might prevent complete regeneration. The in vivo application of human mesenchymal stem cells (HMSCs) of the umbilical cord and the conditioned media (CM) where the HMSCs were cultured and expanded, associated with different vehicles to induce muscle regeneration, was evaluated in a rat myectomy model. Two commercially available vehicles and a spherical hydrogel developed by our research group were used. The treated groups obtained interesting results in terms of muscle regeneration, both in the histological and in the functional assessments. A less evident scar tissue, demonstrated by collagen type I quantification, was present in the muscles treated with HMSCs or their CM. In terms of the histological evaluation performed by ISO 10993-6 scoring, it was observed that HMSCs apparently have a long-term negative effect, since the groups treated with CM presented better scores. CM could be considered an alternative to the in vivo transplantation of these cells, as it can benefit from the local tissue response to secreted molecules with similar results in terms of muscular regeneration. Searching for an optimal vehicle might be the key point in the future of skeletal muscle tissue engineering.

18.
Biomed Res Int ; 2014: 302659, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25121094

RESUMO

In peripheral nerves MSCs can modulate Wallerian degeneration and the overall regenerative response by acting through paracrine mechanisms directly on regenerating axons or upon the nerve-supporting Schwann cells. In the present study, the effect of human MSCs from Wharton's jelly (HMSCs), differentiated into neuroglial-like cells associated to poly (DL-lactide-ε-caprolactone) membrane, on nerve regeneration, was evaluated in the neurotmesis injury rat sciatic nerve model. Results in vitro showed successful differentiation of HMSCs into neuroglial-like cells, characterized by expression of specific neuroglial markers confirmed by immunocytochemistry and by RT-PCR and qPCR targeting specific genes expressed. In vivo testing evaluated during the healing period of 20 weeks, showed no evident positive effect of HMSCs or neuroglial-like cell enrichment at the sciatic nerve repair site on most of the functional and nerve morphometric predictors of nerve regeneration although the nociception function was almost normal. EPT on the other hand, recovered significantly better after HMSCs enriched membrane employment, to values of residual functional impairment compared to other treated groups. When the neurotmesis injury can be surgically reconstructed with an end-to-end suture or by grafting, the addition of a PLC membrane associated with HMSCs seems to bring significant advantage, especially concerning the motor function recovery.


Assuntos
Modelos Animais de Doenças , Células-Tronco Mesenquimais/citologia , Regeneração Nervosa/efeitos dos fármacos , Traumatismos dos Nervos Periféricos/fisiopatologia , Traumatismos dos Nervos Periféricos/terapia , Poliésteres/farmacologia , Geleia de Wharton/citologia , Animais , Fenômenos Biomecânicos/efeitos dos fármacos , Diferenciação Celular/efeitos dos fármacos , Humanos , Imuno-Histoquímica , Cariotipagem , Membranas Artificiais , Transplante de Células-Tronco Mesenquimais , Células-Tronco Mesenquimais/efeitos dos fármacos , Neuroglia/citologia , Neuroglia/efeitos dos fármacos , Traumatismos dos Nervos Periféricos/patologia , Ratos , Tempo de Reação , Reflexo/efeitos dos fármacos , Reprodutibilidade dos Testes , Nervo Isquiático/efeitos dos fármacos , Nervo Isquiático/patologia , Nervo Isquiático/fisiopatologia
19.
Biofabrication ; 5(4): 045004, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24192056

RESUMO

Novel additive manufacturing processes are increasingly recognized as ideal techniques to produce 3D biodegradable structures with optimal pore size and spatial distribution, providing an adequate mechanical support for tissue regeneration while shaping in-growing tissues. With regard to the mechanical and biological performances of 3D scaffolds, pore size and geometry play a crucial role. In this study, a novel integrated automated system for the production and in vitro culture of 3D constructs, known as BioCell Printing, was used only to manufacture poly(ε-caprolactone) scaffolds for tissue engineering; the influence of pore size and shape on their mechanical and biological performances was investigated. Imposing a single lay-down pattern of 0°/90° and varying the filament distance, it was possible to produce scaffolds with square interconnected pores with channel sizes falling in the range of 245-433 µm, porosity 49-57% and a constant road width. Three different lay-down patterns were also adopted (0°/90°, 0°/60/120° and 0°/45°/90°/135°), thus resulting in scaffolds with quadrangular, triangular and complex internal geometries, respectively. Mechanical compression tests revealed a decrease of scaffold stiffness with the increasing porosity and number of deposition angles (from 0°/90° to 0°/45°/90°/135°). Results from biological analysis, carried out using human mesenchymal stem cells, suggest a strong influence of pore size and geometry on cell viability. On the other hand, after 21 days of in vitro static culture, it was not possible to detect any significant variation in terms of cell morphology promoted by scaffold topology. As a first systematic analysis, the obtained results clearly demonstrate the potential of the BioCell Printing process to produce 3D scaffolds with reproducible well organized architectures and tailored mechanical properties.


Assuntos
Materiais Biocompatíveis/química , Bioimpressão/métodos , Células-Tronco Mesenquimais/citologia , Poliésteres/química , Engenharia Tecidual/instrumentação , Alicerces Teciduais , Adesão Celular , Proliferação de Células , Sobrevivência Celular/efeitos dos fármacos , Força Compressiva , Humanos , Teste de Materiais , Células-Tronco Mesenquimais/efeitos dos fármacos , Poliésteres/farmacologia , Porosidade
20.
Acta Biomater ; 9(4): 5997-6005, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23313115

RESUMO

Cellular adhesion and proliferation inside three-dimensional synthetic scaffolds represent a major challenge in tissue engineering. Besides the surface chemistry of the polymers, it is well recognized that scaffold internal architecture, namely pore size/shape and interconnectivity, has a strong effect on the biological response of cells. This study reports for the first time how polycaprolactone (PCL) scaffolds with controlled micro-architecture can be effectively produced via bioextrusion and used to enhance the penetration of plasma deposited species. Low-pressure nitrogen-based coatings were employed to augment cell adhesion and proliferation without altering the mechanical properties of the structures. X-ray photoelectron spectroscopy carried out on different sections of the scaffolds indicates a uniform distribution of nitrogen-containing groups throughout the entire porous structure. In vitro biological assays confirm that plasma deposition sensitively promotes the activity of Saos-2 osteoblast cells, leading to a homogeneous colonization of the PCL scaffolds.


Assuntos
Osteoblastos/citologia , Osteoblastos/fisiologia , Gases em Plasma/química , Poliésteres/química , Engenharia Tecidual/instrumentação , Alicerces Teciduais , Adesão Celular , Linhagem Celular , Força Compressiva , Módulo de Elasticidade , Desenho de Equipamento , Análise de Falha de Equipamento , Humanos , Teste de Materiais , Propriedades de Superfície
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA