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1.
Ann Ig ; 2024 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-38899568

RESUMO

Background: In the context of Infections Prevention and Control activities, the training of healthcare-associated infection control figures is crucial; the COVID-19 pandemic further emphasized the necessity of ensuring a widespread and stable level of skills over time for such professionals. The present work aims to identify the number and training needs of the personnel working in the Emilia-Romagna Region's healthcare facilities as "healthcare-associated infection control figures". Methods: Data were collected through a survey created by experts from the Regional Group "Training in the prevention and control of antibiotic resistance". The questionnaire explored the number, professional and educational background, and training requirements of Healthcare-associated infections control figures in Emilia-Romagna. Results: With 73 figures dedicated to Healthcare-associated infections control, the Emilia-Romagna Region appears to be in line with the European standard ratio (1 professional every 125 beds). Professionals with a nursing background, over 50 years old and of female sex prevail in the group, while the training needs expressed include both theoretical and practical aspects. Conclusions: Healthcare assistants and nursing staff represent a fundamental resource for the implementation of infection prevention and control programs in our healthcare facilities; continuous, multidisciplinary and targeted training of these professionals is confirmed as necessary.

2.
EMBO J ; 38(2)2019 01 15.
Artigo em Inglês | MEDLINE | ID: mdl-30498130

RESUMO

Intestinal handling of dietary proteins usually prevents local inflammatory and immune responses and promotes oral tolerance. However, in ~ 1% of the world population, gluten proteins from wheat and related cereals trigger an HLA DQ2/8-restricted TH1 immune and antibody response leading to celiac disease. Prior epithelial stress and innate immune activation are essential for breaking oral tolerance to the gluten component gliadin. How gliadin subverts host intestinal mucosal defenses remains elusive. Here, we show that the α-gliadin-derived LGQQQPFPPQQPY peptide (P31-43) inhibits the function of cystic fibrosis transmembrane conductance regulator (CFTR), an anion channel pivotal for epithelial adaptation to cell-autonomous or environmental stress. P31-43 binds to, and reduces ATPase activity of, the nucleotide-binding domain-1 (NBD1) of CFTR, thus impairing CFTR function. This generates epithelial stress, tissue transglutaminase and inflammasome activation, NF-κB nuclear translocation and IL-15 production, that all can be prevented by potentiators of CFTR channel gating. The CFTR potentiator VX-770 attenuates gliadin-induced inflammation and promotes a tolerogenic response in gluten-sensitive mice and cells from celiac patients. Our results unveil a primordial role for CFTR as a central hub orchestrating gliadin activities and identify a novel therapeutic option for celiac disease.


Assuntos
Doença Celíaca/metabolismo , Regulador de Condutância Transmembrana em Fibrose Cística/genética , Regulador de Condutância Transmembrana em Fibrose Cística/metabolismo , Gliadina/farmacologia , Fragmentos de Peptídeos/farmacologia , Adolescente , Aminofenóis/administração & dosagem , Aminofenóis/farmacologia , Animais , Células CACO-2 , Doença Celíaca/tratamento farmacológico , Doença Celíaca/genética , Linhagem Celular , Criança , Regulador de Condutância Transmembrana em Fibrose Cística/química , Modelos Animais de Doenças , Regulação para Baixo , Feminino , Humanos , Masculino , Camundongos , Ligação Proteica/efeitos dos fármacos , Conformação Proteica , Domínios Proteicos , Quinolonas/administração & dosagem , Quinolonas/farmacologia , Adulto Jovem
3.
Breast Cancer Res Treat ; 180(1): 157-165, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31975316

RESUMO

PURPOSE: To determine whether a red clover preparation plus dietary intervention administered to premenopausal women with breast cancer (BC), improves menopausal symptoms due to anti-oestrogen treatment, and hence promotes compliance with tamoxifen, prevents weight gain and is safe. METHODS: Surgically-treated premenopausal women with oestrogen receptor (ER) positive disease taking tamoxifen were recruited to a prospective double-blind randomized trial (NCT03844685). The red clover group (N = 42) received one oral tablet/day (Promensil® Forte) containing 80 mg red clover extract for 24 months. The placebo group (N = 39) received one oral tablet/day without active ingredient. All women were encouraged to follow a Mediterranean-type diet and keep active. Outcomes were Menopausal Rating Score (MRS), body mass index (BMI), waist and hip girth, insulin resistance, and levels of cholesterol, triglycerides, and sex hormones. As safety indicators, endometrial thickness, breast density, and effects of patient serum on ER-positive BC cell lines were investigated. RESULTS: MRS reduced significantly (p < 0.0001) with no between-group difference (p = 0.69). The red clover group had significantly greater reductions in BMI and waist circumference (p < 0.0001 both cases). HDL cholesterol increased significantly in both groups (p = 0.01). Hormone levels and insulin resistance changed little. Endometrial thickness remained constant (p = 0.93). Breast density decreased significantly in both groups (p < 0.0001). Proliferation and oestrogen-regulated gene expression didn't differ in cell lines treated with serum from each group. CONCLUSIONS: This is the first trial to assess red clover in BC patients on tamoxifen. The preparation proved safe clinically and in vitro, and was associated with reduced BMI and waist circumference, but the diet-lifestyle intervention probably improved the menopausal symptoms.


Assuntos
Antineoplásicos Hormonais/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Neoplasias da Mama/epidemiologia , Suplementos Nutricionais , Estilo de Vida , Menopausa , Tamoxifeno/uso terapêutico , Trifolium , Antineoplásicos Hormonais/administração & dosagem , Antineoplásicos Hormonais/efeitos adversos , Biomarcadores Tumorais , Neoplasias da Mama/diagnóstico , Neoplasias da Mama/etiologia , Terapia Combinada , Feminino , Fogachos/tratamento farmacológico , Fogachos/epidemiologia , Humanos , Pré-Menopausa , Tamoxifeno/administração & dosagem , Tamoxifeno/efeitos adversos , Terapêutica , Trifolium/química
4.
Small ; 16(21): e2000598, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-32363795

RESUMO

The interaction of a living organism with external foreign agents is a central issue for its survival and adaptation to the environment. Nanosafety should be considered within this perspective, and it should be examined that how different organisms interact with engineered nanomaterials (NM) by either mounting a defensive response or by physiologically adapting to them. Herein, the interaction of NM with one of the major biological systems deputed to recognition of and response to foreign challenges, i.e., the immune system, is specifically addressed. The main focus is innate immunity, the only type of immunity in plants, invertebrates, and lower vertebrates, and that coexists with adaptive immunity in higher vertebrates. Because of their presence in the majority of eukaryotic living organisms, innate immune responses can be viewed in a comparative context. In the majority of cases, the interaction of NM with living organisms results in innate immune reactions that eliminate the possible danger with mechanisms that do not lead to damage. While in some cases such interaction may lead to pathological consequences, in some other cases beneficial effects can be identified.


Assuntos
Imunidade Inata , Nanoestruturas , Medição de Risco , Imunidade Adaptativa , Animais , Imunidade Inata/efeitos dos fármacos , Nanoestruturas/toxicidade , Medição de Risco/métodos
5.
EMBO Rep ; 19(7)2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-29752334

RESUMO

Heat-shock factor 1 (HSF1) is the master transcription factor that regulates the response to proteotoxic stress by controlling the transcription of many stress-responsive genes including the heat-shock proteins. Here, we show a novel molecular mechanism controlling the activation of HSF1. We demonstrate that transglutaminase type 2 (TG2), dependent on its protein disulphide isomerase activity, triggers the trimerization and activation of HSF1 regulating adaptation to stress and proteostasis impairment. In particular, we find that TG2 loss of function correlates with a defect in the nuclear translocation of HSF1 and in its DNA-binding ability to the HSP70 promoter. We show that the inhibition of TG2 restores the unbalance in HSF1-HSP70 pathway in cystic fibrosis (CF), a human disorder characterized by deregulation of proteostasis. The absence of TG2 leads to an increase of about 40% in CFTR function in a new experimental CF mouse model lacking TG2. Altogether, these results indicate that TG2 plays a key role in the regulation of cellular proteostasis under stressful cellular conditions through the modulation of the heat-shock response.


Assuntos
Fibrose Cística/genética , Proteínas de Ligação a DNA/genética , Proteínas de Ligação ao GTP/genética , Fatores de Transcrição de Choque Térmico/genética , Transglutaminases/genética , Animais , Fibrose Cística/patologia , Regulação da Expressão Gênica , Resposta ao Choque Térmico/genética , Humanos , Camundongos , Regiões Promotoras Genéticas , Ligação Proteica , Isomerases de Dissulfetos de Proteínas/genética , Proteína 2 Glutamina gama-Glutamiltransferase , Processamento de Proteína Pós-Traducional/genética , Proteostase/genética , Transdução de Sinais
6.
Minerva Pediatr ; 71(4): 362-370, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-30761822

RESUMO

High variability in the response rates to treatments can make the interpretation of data from clinical trials very difficult, particularly in rare genetic diseases in which the enrolment of thousands of patients is problematic. Personalized medicine largely depends on the establishment of appropriate early detectors of drug efficacy that may guide the administration (or discontinuation) of specific treatments. Such biomarkers should be capable of predicting the therapeutic response of individual patients and of monitoring early benefits of candidate drugs before late clinical benefits become evident. The identification of these biomarkers implies a rigorous stepwise process of translation from preclinical evaluation in cultured cells, suitable animal models or patient-derived freshly isolated cells to clinical application. In this review, we will discuss how a process of research translation can lead to the implementation of functional and mechanistic disease-relevant biomarkers. Moreover, we will address how preclinical data can be translated into the clinic in a personalized medical approach that can provide the right drug to the right patient within the right timeframe.


Assuntos
Fibrose Cística/tratamento farmacológico , Medicina de Precisão/métodos , Pesquisa Translacional Biomédica/organização & administração , Animais , Biomarcadores/metabolismo , Modelos Animais de Doenças , Humanos , Doenças Raras/tratamento farmacológico
7.
J Immunol ; 190(10): 5196-206, 2013 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-23606537

RESUMO

We have previously reported that TLR4 signaling is increased in LPS-stimulated cystic fibrosis (CF) macrophages (MΦs), contributing to the robust production of proinflammatory cytokines. The heme oxygenase-1 (HO-1)/CO pathway modulates cellular redox status, inflammatory responses, and cell survival. The HO-1 enzyme, together with the scaffold protein caveolin 1 (CAV-1), also acts as a negative regulator of TLR4 signaling in MΦs. In this study, we demonstrate that in LPS-challenged CF MΦs, HO-1 does not compartmentalize normally to the cell surface and instead accumulates intracellularly. The abnormal HO-1 localization in CF MΦs in response to LPS is due to decreased CAV-1 expression, which is controlled by the cellular oxidative state, and is required for HO-1 delivery to the cell surface. Overexpression of HO-1 or stimulating the pathway with CO-releasing molecules enhances CAV-1 expression in CF MΦs, suggesting a positive-feed forward loop between HO-1/CO induction and CAV-1 expression. These manipulations re-established HO-1 and CAV-1 cell surface localization in CF MΦs. Consistent with restoration of HO-1/CAV-1-negative regulation of TLR4 signaling, genetic or pharmacological (CO-releasing molecule 2) induced enhancement of this pathway decreased the inflammatory response of CF MΦs and CF mice treated with LPS. In conclusion, our results demonstrate that the counterregulatory HO-1/CO pathway, which is critical in balancing and limiting the inflammatory response, is defective in CF MΦs through a CAV-1-dependent mechanism, exacerbating the CF MΦ response to LPS. This pathway could be a potential target for therapeutic intervention for CF lung disease.


Assuntos
Caveolina 1/metabolismo , Regulador de Condutância Transmembrana em Fibrose Cística/metabolismo , Heme Oxigenase-1/metabolismo , Macrófagos/imunologia , Macrófagos/metabolismo , Adolescente , Adulto , Animais , Caveolina 1/biossíntese , Células Cultivadas , Criança , Pré-Escolar , Fibrose Cística/imunologia , Fibrose Cística/metabolismo , Regulador de Condutância Transmembrana em Fibrose Cística/genética , Regulador de Condutância Transmembrana em Fibrose Cística/imunologia , Feminino , Heme Oxigenase-1/biossíntese , Humanos , Inflamação/imunologia , Lipopolissacarídeos/imunologia , Pneumopatias/imunologia , Pneumopatias/metabolismo , Masculino , Proteínas de Membrana/biossíntese , Proteínas de Membrana/metabolismo , Camundongos , Camundongos Knockout , Pólipos Nasais , Espécies Reativas de Oxigênio/metabolismo , Transdução de Sinais , Receptor 4 Toll-Like/metabolismo , Adulto Jovem
8.
J Mater Sci Mater Med ; 25(6): 1483-93, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-24584669

RESUMO

In this study, a sterile and biocompatible chitosan (CHI) gel for wound healing applications was formulated. CHI powder was treated in autoclave (ttCHI) to prepare sterile formulations. The heat treatment modified the CHI molecular weight, as evidenced by GPC analysis, and its physical-chemical features. Differential scanning calorimetry studies indicated that the macromolecules, before and after thermal treatment, differ in the strength of water-polymer interaction leading to different viscoelastic and flow properties. Thermally treated CHI exhibited the following effects: (i) increased the proliferation and migration of human foreskin foetal fibroblasts at 24 h; (ii) accelerated wound healing (measured as area of lesion) at 3 and 10 days in an in vivo model of pressure ulcers. These effects were linked to the increase of the hydroxyproline and haemoglobin content as well as Wnt protein expression. Moreover, we found a reduction of myeloperoxidase activity and TNF-α mRNA expression. These observations suggest the potential of this novel CHI gel in wound healing and other therapeutic applications.


Assuntos
Curativos Hidrocoloides , Quitosana/administração & dosagem , Quitosana/química , Úlcera Cutânea/terapia , Cicatrização/fisiologia , Administração Tópica , Animais , Desenho de Equipamento , Géis/administração & dosagem , Géis/química , Dureza , Masculino , Teste de Materiais , Camundongos , Camundongos Endogâmicos C57BL , Resistência ao Cisalhamento , Úlcera Cutânea/patologia , Resultado do Tratamento , Viscosidade , Cicatrização/efeitos dos fármacos
9.
Microb Biotechnol ; 17(5): e14453, 2024 05.
Artigo em Inglês | MEDLINE | ID: mdl-38683670

RESUMO

Soluble di-iron monooxygenases (SDIMOs) are multi-component enzymes catalysing the oxidation of various substrates. These enzymes are characterized by high sequence and functional diversity that is still not well understood despite their key role in biotechnological processes including contaminant biodegradation. In this study, we analysed a mutant of Rhodoccocus aetherivorans BCP1 (BCP1-2.10) characterized by a transposon insertion in the gene smoA encoding the alpha subunit of the plasmid-located SDIMO SmoABCD. The mutant BCP1-2.10 showed a reduced capacity to grow on propane, lost the ability to grow on butane, pentane and n-hexane and was heavily impaired in the capacity to degrade chloroform and trichloroethane. The expression of the additional SDIMO prmABCD in BCP1-2.10 probably allowed the mutant to partially grow on propane and to degrade it, to some extent, together with the other short-chain n-alkanes. The complementation of the mutant, conducted by introducing smoABCD in the genome as a single copy under a constitutive promoter or within a plasmid under a thiostreptone-inducible promoter, allowed the recovery of the alkanotrophic phenotype as well as the capacity to degrade chlorinated n-alkanes. The heterologous expression of smoABCD allowed a non-alkanotrophic Rhodococcus strain to grow on pentane and n-hexane when the gene cluster was introduced together with the downstream genes encoding alcohol and aldehyde dehydrogenases and a GroEL chaperon. BCP1 smoA gene was shown to belong to the group 6 SDIMOs, which is a rare group of monooxygenases mostly present in Mycobacterium genus and in a few Rhodococcus strains. SmoABCD originally evolved in Mycobacterium and was then acquired by Rhodococcus through horizontal gene transfer events. This work extends the knowledge of the biotechnologically relevant SDIMOs by providing functional and evolutionary insights into a group 6 SDIMO in Rhodococcus and demonstrating its key role in the metabolism of short-chain alkanes and degradation of chlorinated n-alkanes.


Assuntos
Alcanos , Oxigenases de Função Mista , Alcanos/metabolismo , Oxigenases de Função Mista/metabolismo , Oxigenases de Função Mista/genética , Teste de Complementação Genética , Mutagênese Insercional , Biotransformação , Elementos de DNA Transponíveis , Hidrocarbonetos Clorados/metabolismo
10.
Artigo em Inglês | MEDLINE | ID: mdl-36767369

RESUMO

The COVID-19 pandemic has evolved into a severe psychosocial crisis affecting patients, their relatives, friends, and healthcare professionals. In Italy, public health residents (PHRs) remain essential to the national response to the pandemic. To assess their mental sphere, the "Public Mental Health" working group of the medical residents' Assembly of the Italian Society of Hygiene and Preventive Medicine has designed the Public Health Residents' Anonymous Survey in Italy (PHRASI). This is a nation-wide cross-sectional study based on an 88-item self-administered voluntary survey that evaluates how sociodemographic variables are associated with mental issues, including wellness, eating disorders, sleeplessness, alcohol misuse, depression, and anxiety. Data will be gathered by disseminating a Google Forms link across the Assembly network of medical residents. All PHRs enrolled in a four-year program in one of the Italian postgraduate schools of public health will be qualified as participants. PHRASI aims to draw a comprehensive and detailed picture of the mental health state of Italian PHRs. PHRs are a significant group of healthcare professionals that may serve as a future benchmark for developing and enacting regulations intended to support the mental health of healthcare professionals.


Assuntos
COVID-19 , Saúde Pública , Humanos , Saúde Mental , Estudos Transversais , Pandemias , Inquéritos e Questionários , Itália/epidemiologia
11.
Front Endocrinol (Lausanne) ; 14: 1172743, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37293488

RESUMO

Background: Phthalates are non-persistent chemicals largely used as plasticizers and considered ubiquitous pollutants with endocrine disrupting activity. The exposure during sensible temporal windows as pregnancy and early childhood, may influence physiological neurodevelopment. Aims and Scope: The aim of this study is to analyze the relationship between the urinary levels of phthalate metabolites in newborn and infants and the global development measured by the Griffiths Scales of Children Development (GSCD) at six months. Methods: Longitudinal cohort study in healthy Italian term newborn and their mothers from birth to the first 6 months of life. Urine samples were collected at respectively 0 (T0), 3 (T3), 6 (T6) months, and around the delivery for mothers. Urine samples were analyzed for a total of 7 major phthalate metabolites of 5 of the most commonly used phthalates. At six months of age a global child development assessment using the third edition of the Griffith Scales of Child Development (GSCD III) was performed in 104 participants. Results: In a total of 387 urine samples, the seven metabolites analyzed appeared widespread and were detected in most of the urine samples collected at any time of sampling (66-100%). At six months most of the Developmental Quotients (DQs) falls in average range, except for the subscale B, which presents a DQ median score of 87 (85-95). Adjusted linear regressions between DQs and urinary phthalate metabolite concentrations in mothers at T0 and in infants at T0, T3 and T6 identified several negative associations both for infants' and mothers especially for DEHP and MBzP. Moreover, once stratified by children's sex, negative associations were found in boys while positive in girls. Conclusions: Phthalates exposure is widespread, especially for not regulated compounds. Urinary phthalate metabolites were found to be associated to GSCD III scores, showing inverse association with higher phthalate levels related to lower development scores. Our data suggested differences related to the child's sex.


Assuntos
Poluentes Ambientais , Ácidos Ftálicos , Masculino , Criança , Gravidez , Feminino , Recém-Nascido , Humanos , Pré-Escolar , Lactente , Estudos Longitudinais , Ácidos Ftálicos/urina , Parto , Poluentes Ambientais/efeitos adversos , Poluentes Ambientais/metabolismo
12.
Int J Public Health ; 67: 1604804, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35795098

RESUMO

Objectives: The study aimed to assess and compare the global development in six-month-old infants before and during the pandemic restrictive social distancing measures. Methods: This cross-sectional nested study involved infants assessed through the Griffiths Scales of Child Development (GSCD) between September 2019 and April 2021. Infants were classified in a pre-COVID or a COVID group, considering the evaluation date and the restrictive measures in place. GSCD subscales and General Development Scores (GDS) were calculated and compared. Results: One hundred and four healthy term-born infants were evaluated. GDS in the COVID group (n:70; median: 94; IQR: 90-100) appeared significantly lower than in the pre-COVID group (n:34; median: 98; IQR: 97-103; p < 0.001). Language and personal-social-emotional subareas scores appeared the most affected. A decreasing trend of GDS along with the severity of restriction was observed. Conclusion: A reduction in infant development scores was observed during pandemic social distancing. Further studies are needed to systematize these findings and to address effective public health policies for infants and families during long-term forced isolation periods.


Assuntos
COVID-19 , Pandemias , COVID-19/epidemiologia , Criança , Desenvolvimento Infantil , Estudos Transversais , Humanos , Lactente
13.
PLoS One ; 16(1): e0245302, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33412572

RESUMO

This study aims to investigate cholesterol metabolism in a mouse model with cystic fibrosis (CF) by the comparison of affected homozygous versus wild type (WT) mice. In particular, we evaluated the effects of a diet enriched with cholesterol in both mice groups in comparison with the normal diet. To this purpose, beyond serum and liver cholesterol, we analyzed serum phytosterols as indirect markers of intestinal absorption of cholesterol, liver lathosterol as indirect marker of de novo cholesterol synthesis, liver cholestanol (a catabolite of bile salts synthesis) and the liver mRNA levels of LDL receptor (LDLR), 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoAR), acyl CoA:cholesterol acyl transferase 2 (ACAT2), cytochrome P450 7A1 (CYP7A1) and tumor necrosis factor alpha (TNFα). CF mice showed lower intestinal absorption and higher liver synthesis of cholesterol than WT mice. In WT mice, the cholesterol supplementation inhibits the synthesis of liver cholesterol and enhances its catabolism, while in CF mice we did not observe a reduction of LDLR and HMG-CoAR expression (probably due to an altered feed-back), causing an increase of intracellular cholesterol. In addition, we observed a further increase (5-fold) in TNFα mRNA levels. This preliminary study suggests that in CF mice there is a vicious circle in which the altered synthesis/secretion of bile salts may reduce the digestion/absorption of cholesterol. As a result, the liver increases the biosynthesis of cholesterol that accumulates in the cells, triggering inflammation and further compromising the metabolism of bile salts.


Assuntos
Colesterol/metabolismo , Regulador de Condutância Transmembrana em Fibrose Cística/genética , Fibrose Cística/patologia , Metabolismo dos Lipídeos , Fígado/metabolismo , Mutação , Esteroide Hidroxilases/metabolismo , Animais , Fibrose Cística/genética , Fibrose Cística/metabolismo , Feminino , Homozigoto , Masculino , Taxa de Depuração Metabólica , Camundongos
14.
Nanomaterials (Basel) ; 11(12)2021 Nov 23.
Artigo em Inglês | MEDLINE | ID: mdl-34947510

RESUMO

The global economic success of man-made nanoscale materials has led to a higher production rate and diversification of emission sources in the environment. For these reasons, novel nanosafety approaches to assess the environmental impact of engineered nanomaterials are required. While studying the potential toxicity of metal nanoparticles (NPs), we realized that gold nanoparticles (AuNPs) have a growth-promoting rather than a stress-inducing effect. In this study we established stable short- and long-term exposition systems for testing plant responses to NPs. Exposure of plants to moderate concentrations of AuNPs resulted in enhanced growth of the plants with longer primary roots, more and longer lateral roots and increased rosette diameter, and reduced oxidative stress responses elicited by the immune-stimulatory PAMP flg22. Our data did not reveal any detrimental effects of AuNPs on plants but clearly showed positive effects on growth, presumably by their protective influence on oxidative stress responses. Differential transcriptomics and proteomics analyses revealed that oxidative stress responses are downregulated whereas growth-promoting genes/proteins are upregulated. These omics datasets after AuNP exposure can now be exploited to study the underlying molecular mechanisms of AuNP-induced growth-promotion.

15.
Cell Death Discov ; 7(1): 45, 2021 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-33712560

RESUMO

Celiac disease (CD) is a complex immune-mediated chronic disease characterized by a consistent inflammation of the gastrointestinal tract induced by gluten intake in genetically predisposed individuals. Although initiated by the interaction between digestion-derived gliadin, a gluten component, peptides, and the intestinal epithelium, the disorder is highly complex and involving other components of the intestine, such as the immune system. Therefore, conventional model systems, mainly based on two- or three-dimension cell cultures and co-cultures, cannot fully recapitulate such a complex disease. The development of mouse models has facilitated the study of different interacting cell types involved in the disorder, together with the impact of environmental factors. However, such in vivo models are often expensive and time consuming. Here we propose an organ ex vivo culture (gut-ex-vivo system) based on small intestines from gluten-sensitive mice cultivated in a dynamic condition, able to fully recapitulate the biochemical and morphological features of the mouse model exposed to gliadin (4 weeks), in 16 h. Indeed, upon gliadin exposure, we observed: i) a down-regulation of cystic fibrosis transmembrane regulator (CFTR) and an up-regulation of transglutaminase 2 (TG2) at both mRNA and protein levels; ii) increased intestinal permeability associated with deregulated tight junction protein expression; iii) induction and production of pro-inflammatory cytokines such as interleukin (IL)-15, IL-17 and interferon gamma (IFNγ); and iv) consistent alteration of intestinal epithelium/villi morphology. Altogether, these data indicate that the proposed model can be efficiently used to study the pathogenesis of CD, test new or repurposed molecules to accelerate the search for new treatments, and to study the impact of the microbiome and derived metabolites, in a time- and cost- effective manner.

16.
Nanomaterials (Basel) ; 11(6)2021 Jun 09.
Artigo em Inglês | MEDLINE | ID: mdl-34207693

RESUMO

Many components of the innate immune system are evolutionarily conserved and shared across many living organisms, from plants and invertebrates to humans. Therefore, these shared features can allow the comparative study of potentially dangerous substances, such as engineered nanoparticles (NPs). However, differences of methodology and procedure between diverse species and models make comparison of innate immune responses to NPs between organisms difficult in many cases. To this aim, this review provides an overview of suitable methods and assays that can be used to measure NP immune interactions across species in a multidisciplinary approach. The first part of this review describes the main innate immune defense characteristics of the selected models that can be associated to NPs exposure. In the second part, the different modes of exposure to NPs across models (considering isolated cells or whole organisms) and the main endpoints measured are discussed. In this synergistic perspective, we provide an overview of the current state of important cross-disciplinary immunological models to study NP-immune interactions and identify future research needs. As such, this paper could be used as a methodological reference point for future nano-immunosafety studies.

17.
Nutrients ; 13(4)2021 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-33917155

RESUMO

Exposure to gluten, a protein present in wheat rye and barley, is the major inducer for human Celiac Disease (CD), a chronic autoimmune enteropathy. CD occurs in about 1% worldwide population, in genetically predisposed individuals bearing human leukocyte antigen (HLA) DQ2/DQ8. Gut epithelial cell stress and the innate immune activation are responsible for the breaking oral tolerance to gliadin, a gluten component. To date, the only treatment available for CD is a long-term gluten-free diet. Several studies have shown that an altered composition of the intestinal microbiota (dysbiosis) could play a key role in the pathogenesis of CD through the modulation of intestinal permeability and the regulation of the immune system. Here, we show that gliadin induces a chronic endoplasmic reticulum (ER) stress condition in the small intestine of a gluten-sensitive mouse model and that the coadministration of probiotics efficiently attenuates both the unfolded protein response (UPR) and gut inflammation. Moreover, the composition of probiotics formulations might differ in their activity at molecular level, especially toward the three axes of the UPR. Therefore, probiotics administration might potentially represent a new valuable strategy to treat gluten-sensitive patients, such as those affected by CD.


Assuntos
Suplementos Nutricionais , Estresse do Retículo Endoplasmático , Intolerância Alimentar/terapia , Trato Gastrointestinal/patologia , Gliadina/efeitos adversos , Glutens/efeitos adversos , Inflamação/patologia , Probióticos/uso terapêutico , Animais , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/uso terapêutico , Células CACO-2 , Regulador de Condutância Transmembrana em Fibrose Cística/metabolismo , Modelos Animais de Doenças , Estresse do Retículo Endoplasmático/efeitos dos fármacos , Proteínas de Ligação ao GTP/metabolismo , Trato Gastrointestinal/efeitos dos fármacos , Humanos , Camundongos Endogâmicos BALB C , Permeabilidade , Probióticos/administração & dosagem , Proteína 2 Glutamina gama-Glutamiltransferase , Transglutaminases/metabolismo , Regulação para Cima
18.
Cell Cycle ; 19(19): 2411-2425, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32816618

RESUMO

Human skin melanoma is one of the most aggressive and difficult to treat human malignancies, with an increasing incidence over the years. While the resection of the early diagnosed primary tumor remains the best clinical approach, advanced/metastatic melanoma still remains with a poor prognosis. Indeed, although enormous progress in the therapeutic treatment of human tumors has been made in recent years, patients affected by metastatic melanoma are still poorly affected by these clinical advances. Therefore, new valuable therapeutic approaches are urgently needed, to design and define effective treatments to consistently increase the overall survival rate of patients affected by this malignancy. In this review we summarize the main signaling pathways studied to kill human skin melanoma, and introduce the ferroptotic cell death as a new pathway to be explored to eradicate this tumor.


Assuntos
Ferroptose , Melanoma/secundário , Neoplasias Cutâneas/patologia , Animais , Antineoplásicos/uso terapêutico , Ferroptose/efeitos dos fármacos , Humanos , Melanoma/tratamento farmacológico , Melanoma/metabolismo , Terapia de Alvo Molecular , Espécies Reativas de Oxigênio/metabolismo , Transdução de Sinais , Neoplasias Cutâneas/tratamento farmacológico , Neoplasias Cutâneas/metabolismo
19.
Cell Death Dis ; 11(8): 645, 2020 08 18.
Artigo em Inglês | MEDLINE | ID: mdl-32811809

RESUMO

The pathogenesis of Alzheimer's disease (AD), a slowly-developing age-related neurodegenerative disorder, is a result of the action of multiple factors including deregulation of Ca2+ homeostasis, mitochondrial dysfunction, and dysproteostasis. Interaction of these factors in astrocytes, principal homeostatic cells in the central nervous system, is still poorly understood. Here we report that in immortalized hippocampal astrocytes from 3xTg-AD mice (3Tg-iAstro cells) bioenergetics is impaired, including reduced glycolysis and mitochondrial oxygen consumption, and increased production of reactive oxygen species. Shotgun proteomics analysis of mitochondria-ER-enriched fraction showed no alterations in the expression of mitochondrial and OxPhos proteins, while those related to the ER functions and protein synthesis were deregulated. Using ER- and mitochondria-targeted aequorin-based Ca2+ probe we show that, in 3Tg-iAstro cells, ER was overloaded with Ca2+ while Ca2+ uptake by mitochondria upon ATP stimulation was reduced. This was accompanied by the increase in short distance (≈8-10 nm) contact area between mitochondria and ER, upregulation of ER-stress/unfolded protein response genes Atf4, Atf6 and Herp, and reduction of global protein synthesis rate. We suggest that familial AD mutations in 3Tg-iAstro cells induce mitochondria-ER interaction changes that deregulate astrocytic bioenergetics, Ca2+ homeostasis and proteostasis. These factors may interact, creating a pathogenic loop compromising homeostatic and defensive functions of astroglial cells predisposing neurons to dysfunction.


Assuntos
Doença de Alzheimer/metabolismo , Astrócitos/metabolismo , Animais , Encéfalo/metabolismo , Cálcio/metabolismo , Retículo Endoplasmático/metabolismo , Metabolismo Energético , Glicólise/fisiologia , Hipocampo/metabolismo , Homeostase , Humanos , Camundongos , Camundongos Transgênicos , Mitocôndrias/metabolismo , Neurônios/metabolismo , Consumo de Oxigênio/fisiologia , Proteômica , Proteostase , Espécies Reativas de Oxigênio/metabolismo , Resposta a Proteínas não Dobradas
20.
Cell Death Dis ; 10(4): 258, 2019 03 15.
Artigo em Inglês | MEDLINE | ID: mdl-30874543

RESUMO

Under physiological conditions, a finely tuned system of cellular adaptation allows the intestinal mucosa to maintain the gut barrier function while avoiding excessive immune responses to non-self-antigens from dietary origin or from commensal microbes. This homeostatic function is compromised in cystic fibrosis (CF) due to loss-of-function mutations in the CF transmembrane conductance regulator (CFTR). Recently, we reported that mice bearing defective CFTR are abnormally susceptible to a celiac disease-like enteropathy, in thus far that oral challenge with the gluten derivative gliadin elicits an inflammatory response. However, the mechanisms through which CFTR malfunction drives such an exaggerated response to dietary protein remains elusive. Here we demonstrate that the proteostasis regulator/transglutaminase 2 (TGM2) inhibitor cysteamine restores reduced Beclin 1 (BECN1) protein levels in mice bearing cysteamine-rescuable F508del-CFTR mutant, either in homozygosis or in compound heterozygosis with a null allele, but not in knock-out CFTR mice. When cysteamine restored BECN1 expression, autophagy was increased and gliadin-induced inflammation was reduced. The beneficial effects of cysteamine on F508del-CFTR mice were lost when these mice were backcrossed into a Becn1 haploinsufficient/autophagy-deficient background. Conversely, the transfection-enforced expression of BECN1 in human intestinal epithelial Caco-2 cells mitigated the pro-inflammatory cellular stress response elicited by the gliadin-derived P31-43 peptide. In conclusion, our data provide the proof-of-concept that autophagy stimulation may mitigate the intestinal malfunction of CF patients.


Assuntos
Autofagia/efeitos dos fármacos , Cisteamina/farmacologia , Regulador de Condutância Transmembrana em Fibrose Cística/genética , Regulador de Condutância Transmembrana em Fibrose Cística/metabolismo , Fibrose Cística/genética , Gliadina/imunologia , Fragmentos de Peptídeos/imunologia , Animais , Autofagia/genética , Proteína Beclina-1/genética , Proteína Beclina-1/metabolismo , Células CACO-2 , Cisteamina/uso terapêutico , Fibrose Cística/imunologia , Regulador de Condutância Transmembrana em Fibrose Cística/antagonistas & inibidores , Citocinas/metabolismo , Células Epiteliais/efeitos dos fármacos , Células Epiteliais/imunologia , Células Epiteliais/metabolismo , Proteínas de Ligação ao GTP/antagonistas & inibidores , Proteínas de Ligação ao GTP/metabolismo , Gliadina/toxicidade , Heterozigoto , Homozigoto , Humanos , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Fragmentos de Peptídeos/toxicidade , Proteína 2 Glutamina gama-Glutamiltransferase , Transglutaminases/antagonistas & inibidores , Transglutaminases/metabolismo
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