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1.
Appl Physiol Nutr Metab ; 49(5): 700-711, 2024 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-38320255

RESUMO

One in three hospitalized children have disease-related malnutrition (DRM) upon admission to hospital, and all children are at risk for further nutritional deterioration during hospital stay; however, systematic approaches to detect DRM in Canada are lacking. To standardise and improve hospital care, the multidisciplinary pediatric working group of the Canadian Malnutrition Taskforce aimed to develop a pediatric, inpatient nutritional care pathway based on available evidence, feasibility of resources, and expert consensus. The working group (n = 13) undertook a total of four meetings: an in-person meeting to draft the pathway based on existing literature and modelled after the Integrated Nutrition Pathway for Acute Care (INPAC) in adults, followed by three online surveys and three rounds of online Delphi consensus meetings to achieve agreement on the draft pathway. In the first Delphi survey, 32 questions were asked, whereas in the second and third rounds 27 and 8 questions were asked, respectively. Consensus was defined as any question/issue in which at least 80% agreed. The modified Delphi process allowed the development of an evidence-informed, consensus-based pathway for inpatients, the Pediatric Integrated Nutrition Pathway for Acute Care (P-INPAC). It includes screening <24 h of admission, assessment with use of Subjective Global Nutritional Assessment (SGNA) <48 h of admission, as well as prevention, and treatment of DRM divided into standard, advanced, and specialized nutrition care plans. Research is necessary to explore feasibility of implementation and evaluate the effectiveness by integrating P-INPAC into clinical practice.


Assuntos
Técnica Delphi , Avaliação Nutricional , Humanos , Criança , Canadá , Procedimentos Clínicos , Consenso , Desnutrição/terapia , Desnutrição/prevenção & controle , Desnutrição/diagnóstico , Estado Nutricional , Transtornos da Nutrição Infantil/terapia , Transtornos da Nutrição Infantil/diagnóstico , Hospitalização
2.
Am J Gastroenterol ; 117(4): 637-646, 2022 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-35132979

RESUMO

INTRODUCTION: There is currently little knowledge on factors associated with the relapse of Crohn's disease (CD) in children. The aims of this study were to describe the risk factors associated with relapse in pediatric CD and the changes in the relapse rate over the past decade. METHODS: Patients younger than 18 years and diagnosed between 2009 and 2019 were included in this retrospective cohort study. Clinical, endoscopic, histological, and laboratory data, as well as induction and maintenance treatments, were collected from the medical records. Survival analyses and Cox regression models were used to assess the impact of these risk factors on relapse. RESULTS: Six hundred thirty-nine patients were included. There was a decrease in the clinical relapse rate over the past decade: 70.9% of the patients diagnosed between 2009 and 2014 relapsed as compared with 49.1% of the patients diagnosed between 2015 and 2019 (P < 0.0001). The following variables were associated with clinical relapse: female sex (adjusted hazard ratio [aHR] = 1.52, P = 0.0007), exposure to oral 5-ASA (aHR = 1.44, P = 0.04), use of immunomodulatory agents compared with tumor necrosis factor-alpha inhibitors (methotrexate aHR = 1.73, P = 0.003; thiopurines aHR = 1.63, P = 0.002), presence of granulomas (aHR = 1.34, P = 0.02) and increased eosinophils on intestinal biopsies (aHR = 1.36, P = 0.02), high levels of C-reactive protein (aHR = 1.01, P < 0.0001) and fecal calprotectin (aHR = 1.08, P < 0.0001), and low serum infliximab levels (aHR = 2.32, P = 0.001). DISCUSSION: Relapse of pediatric CD has decreased in the past decade. The risk of relapse is significantly associated with clinical, endoscopic, histological, and laboratory variables and treatment strategies.


Assuntos
Doença de Crohn , Criança , Doença de Crohn/diagnóstico , Doença de Crohn/tratamento farmacológico , Feminino , Humanos , Infliximab/uso terapêutico , Recidiva , Estudos Retrospectivos , Fatores de Risco
3.
Dig Liver Dis ; 54(3): 343-351, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-34756526

RESUMO

BACKGROUND AND AIMS: The aims of this study were to describe the trends in the behavior of pediatric CD during the last decade and to describe the seasonal variation of disease presentation. METHODS: Patients under 18 years old and diagnosed between 2009 and 2019 were included. The clinical, endoscopic, histological, and laboratory data were collected from the medical records. We analyzed the trends of these parameters according to the year and season of diagnosis. RESULTS: 654 patients were included in the study. The number of incident CD cases increased yearly. Patients diagnosed between 2015 and 2019 were younger at diagnosis (OR 2.53, p = 0.02), had more perianal diseases (OR: 2.30, p < 0.0001) and more granulomas (OR: 1.61, p = 0.003), but fewer eosinophils (OR: 0.35, p < 0.0001) and less chronic lymphoplasmacytic infiltrate (OR: 0.56, p = 0.008) as compared to the 2009-2014 cohort. There was fewer CD diagnosis during winter. Patients diagnosed in the fall had lower PCDAIs, less failure to thrive and less extensive digestive involvement. Colonic disease was significantly more frequent during summer and fall. CONCLUSION: The clinical and histological phenotype of CD has changed over time and there are important seasonal trends in the frequency and severity on disease behavior suggesting possible disease triggers.


Assuntos
Doença de Crohn/patologia , Adolescente , Idade de Início , Criança , Doença de Crohn/complicações , Doença de Crohn/epidemiologia , Progressão da Doença , Feminino , Granuloma/epidemiologia , Granuloma/etiologia , Granuloma/patologia , Humanos , Incidência , Masculino , Fenótipo , Estações do Ano , Índice de Gravidade de Doença
4.
JGH Open ; 5(12): 1373-1381, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34950781

RESUMO

BACKGROUND AND AIM: Data on factors influencing time to remission in pediatric Crohn's disease (CD) are very limited in the literature. The aim of this retrospective cohort study was to describe the trends of time to clinical remission over the past decade and to identify factors associated with time to clinical remission in children with luminal CD. METHODS: Patients under 18 years old diagnosed between 2009 and 2019 were included. All data were collected from the patients' medical records. Survival analyses and linear regression models were used to assess the impact of clinical, laboratory, endoscopic, histological, and therapeutic factors on time to clinical remission. RESULTS: A total of 654 patients were included in the study. There was no change in the time to clinical remission over the decade. Female sex in adolescents (adjusted bêta regression coefficient [aß] = 31.8 days, P = 0.02), upper digestive tract involvement (aß = 46.4 days, P = 0.04) perianal disease (aß = 32.2 days, P = 0.04), presence of active inflammation on biopsies at diagnosis (aß = 46.7 days, P = 0.01) and oral 5-aminosalicylates (5-ASA) exposure (aß = 56.6 days, P = 0.002) were associated with longer time to clinical remission. Antibiotic exposure (aß = -29.3 days, P = 0.04), increased eosinophils (aß = -29.6 days, P = 0.008) and combination of exclusive enteral nutrition with tumor-necrosis-factor-alpha (TNF-alpha) inhibitors as induction therapy (aß = -36.8 days, P = 0.04) were associated with shorter time to clinical remission. CONCLUSION: In children with newly diagnosed Crohn's disease, time to clinical remission did not shorten during the decade. It was associated with baseline clinical and histological data and treatment strategies. Combination of enteral nutrition and TNF-alpha inhibitors was associated with faster clinical remission.

5.
Nutrients ; 13(8)2021 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-34444796

RESUMO

Background: Disease-associated malnutrition (DAM) is common in hospitalized children. This survey aimed to assess current in-hospital practices for clinical care of pediatric DAM in Canada. Methods: An electronic survey was sent to all 15 tertiary pediatric hospitals in Canada and addressed all pillars of malnutrition care: screening, assessment, treatment, monitoring and follow-up. Results: Responses of 120 health care professionals were used from all 15 hospitals; 57.5% were medical doctors (MDs), 26.7% registered dietitians (RDs) and 15.8% nurses (RNs). An overarching protocol for prevention, detection and intervention of pediatric malnutrition was present or "a work in progress", according to 9.6% of respondents. Routine nutritional screening on admission was sometimes or always performed, according to 58.8%, although the modality differed among hospitals and profession. For children with poor nutritional status, lack of nutritional follow-up after discharge was reported by 48.5%. Conclusions: The presence of a standardized protocol for the clinical assessment and management of DAM is uncommon in pediatric tertiary care hospitals in Canada. Routine nutritional screening upon admission has not been widely adopted. Moreover, ongoing nutritional care of malnourished children after discharge seems cumbersome. These findings call for the adoption and implementation of a uniform clinical care pathway for malnutrition among pediatric hospitals.


Assuntos
Desnutrição , Inquéritos Nutricionais , Centros de Atenção Terciária , Canadá , Criança , Criança Hospitalizada , Hospitalização , Hospitais Pediátricos , Humanos , Desnutrição/diagnóstico , Programas de Rastreamento , Enfermeiras e Enfermeiros , Avaliação Nutricional , Estado Nutricional , Nutricionistas , Alta do Paciente , Médicos , Inquéritos e Questionários
7.
JPEN J Parenter Enteral Nutr ; 44(6): 1089-1095, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-31808180

RESUMO

BACKGROUND: Education and training may improve the prescription of pediatric parenteral nutrition. The aim was to evaluate the impact of an e-learning method on parenteral nutrition prescription skills among pediatric residents in 2 pediatric hospitals. METHODS: A randomized double-blind control study was conducted over a 9-month period among pediatric residents in HOSP1, Geneva, Switzerland, where physicians prescribe parenteral nutrition directly, and in HOSP2, Montreal, Canada, where physicians prescribe only occasionally because clinical pharmacists are devoted to this activity. The intervention consisted of an e-learning session about key issues of parenteral nutrition. Physician parenteral nutrition knowledge was evaluated with a standardized questionnaire based on clinical cases before and after the e-learning in the intervention groups; in the control groups, only the 2 tests were conducted. In HOSP1, participants also underwent iterative tests every 2 months to measure the retention of knowledge. RESULTS: Sixty-five physicians participated. Initial knowledge scores were higher in HOSP1 (pretest scores 180 ± 29 vs 133 ± 24, p < 0.001). Overall, there was no significant difference in the impact of the e-learning intervention between the control and e-learning groups (p > 0.05). A significant knowledge improvement was observed in HOSP2 in the e-learning group (p = 0.033). Iterative tests in HOSP1 showed persistence of knowledge without significant differences between the groups. E-learning satisfaction among the participants was outstanding (100%). CONCLUSION: E-learning seems to be an effective method for teaching parenteral nutrition among pediatric residents and fellows at the beginning of the training. High satisfaction with this teaching method was observed in this study.


Assuntos
Instrução por Computador , Nutrição Parenteral , Canadá , Criança , Método Duplo-Cego , Hospitais Universitários , Humanos , Projetos Piloto
8.
Nutrients ; 11(2)2019 Jan 22.
Artigo em Inglês | MEDLINE | ID: mdl-30678232

RESUMO

Presently, undernutrition still goes undetected in pediatric hospitals despite its association with poor clinical outcomes and increased annual hospital costs, thus affecting both the patient and the health care system. The reported prevalence of undernutrition in pediatric patients seeking care or hospitalized varies considerably, ranging from 2.5 to 51%. This disparity is mostly due to the diversity of the origin of populations studied, methods used to detect and assess nutritional status, as well as the lack of consensus for defining pediatric undernutrition. The prevalence among inpatients is likely to be higher than that observed for the community at large, since malnourished children are likely to have a pre-existent disease or to develop medical complications. Meanwhile, growing evidence indicates that the nutritional status of sick children deteriorates during the course of hospitalization. Moreover, the absence of systematic nutritional screening in this environment may lead to an underestimation of this condition. The present review aims to critically discuss studies documenting the prevalence of malnutrition in pediatric hospitals in developed and in-transition countries and identifying hospital practices that may jeopardize the nutritional status of hospitalized children.


Assuntos
Transtornos da Nutrição Infantil/dietoterapia , Transtornos da Nutrição Infantil/etiologia , Criança Hospitalizada , Países em Desenvolvimento , Hospitais Pediátricos/organização & administração , Criança , Humanos
9.
J Pediatr ; 205: 160-167.e6, 2019 02.
Artigo em Inglês | MEDLINE | ID: mdl-30529137

RESUMO

OBJECTIVE: To assess the prevalence, causes, and consequences of malnutrition, as well as the evolution of nutritional status, in Canadian pediatric health care institutions. STUDY DESIGN: In this multicenter prospective cohort study, a total of 371 patients were recruited from pediatric hospitals in 5 Canadian provinces. Subjects were aged 1 month to 18 years; admitted to a medical, surgical, or oncology ward; and had a planned hospital stay of >48 hours. Data on demographics, medical condition, anthropometric measures, and dietary intake were collected. The Screening Tool Risk on Nutritional Status and Growth (STRONGkids) and Subjective Global Nutritional Assessment (SGNA) were applied at admission. Malnutrition was defined as a weight-for-age, height-for-age, body mass index-for-age, or weight-for-length/height z score <-2 SD. RESULTS: Among 307 subjects (median age, 5.3 years; median length of stay, 5 days), 19.5% were malnourished on admission. Both STRONGkids and SGNA classifications were associated with baseline nutritional status. Mean weight-for-age z score was lower at discharge compared with admission (-0.14 vs -0.09; P < .01), and nearly one-half of all patients lost weight during their hospital stay. Only one-half of the children who were malnourished or screened as high risk of malnutrition were visited by a dietitian during their stay. The percentage of patients who lost weight during hospitalization was significantly greater in the group not visited by a dietitian (76.5 vs 23.5%; P < .01). CONCLUSION: Nutritional status deterioration and malnutrition are common in hospitalized Canadian children. Screening tools, anthropometric measurements, and dietitian consultation should be used to establish adequate nutritional support.


Assuntos
Hospitais Pediátricos/estatística & dados numéricos , Desnutrição/epidemiologia , Inquéritos Nutricionais/métodos , Estado Nutricional , Medição de Risco/métodos , Adolescente , Índice de Massa Corporal , Canadá/epidemiologia , Criança , Criança Hospitalizada/estatística & dados numéricos , Pré-Escolar , Feminino , Seguimentos , Humanos , Tempo de Internação/tendências , Masculino , Desnutrição/diagnóstico , Prevalência , Estudos Prospectivos , Fatores de Risco
10.
PLoS One ; 12(3): e0172998, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28253308

RESUMO

It is well established that the formation of radical species centered on various atoms is involved in the mechanism leading to the development of several diseases or to the appearance of deleterious effects of toxic molecules. The detection of free radical is possible using Electron Paramagnetic Resonance (EPR) spectroscopy and the spin trapping technique. The classical EPR spin-trapping technique can be considered as a "hypothesis-driven" approach because it requires an a priori assumption regarding the nature of the free radical in order to select the most appropriate spin-trap. We here describe a "data-driven" approach using EPR and a cocktail of spin-traps. The rationale for using this cocktail was that it would cover a wide range of biologically relevant free radicals and have a large range of hydrophilicity and lipophilicity in order to trap free radicals produced in different cellular compartments. As a proof-of-concept, we validated the ability of the system to measure a large variety of free radicals (O-, N-, C-, or S- centered) in well characterized conditions, and we illustrated the ability of the technique to unambiguously detect free radical production in cells exposed to chemicals known to be radical-mediated toxic agents.


Assuntos
Radicais Livres/química , Marcadores de Spin , Espectroscopia de Ressonância de Spin Eletrônica , Humanos , Células K562
12.
JPEN J Parenter Enteral Nutr ; 41(5): 866-877, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-26838529

RESUMO

BACKGROUND: To examine whether SMOFlipid prevents progression of intestinal failure-associated liver disease (IFALD) in parenteral nutrition (PN)-dependent infants with early IFALD (conjugated bilirubin 17-50 µmol/L, 1-3 mg/dL). STUDY DESIGN: Pilot multicenter blinded randomized controlled trial comparing SMOFlipid with Intralipid. Patients received the trial lipid for up to 12 weeks, unless they achieved full enteral tolerance sooner. The primary clinical outcome was the serum conjugated bilirubin. RESULTS: Twenty-four infants (mean age, 6 weeks) participated in the trial (13 Intralipid and 11 SMOFlipid). At the time of trial enrollment, patients in both groups were receiving 90% of their calories by PN. Mean duration on trial was 8 weeks and did not differ according to treatment ( P = .99). At trial conclusion, patients who received SMOFlipid had a lower conjugated bilirubin than those who received Intralipid (mean difference, -59 µmol/L; P = .03). Patients receiving SMOFlipid were also more likely to have a decrease in serum conjugated bilirubin to 0 µmol/L than those in the Intralipid group over the entire observation period (hazard ratio, 10.6; 95%; P = .03). The time to achievement of full enteral tolerance did not differ statistically (hazard ratio, 1.3; P = .59) between the groups. There was no significant difference in safety outcomes between the groups. CONCLUSIONS: Compared with Intralipid, SMOFlipid reduces the risk of progressive IFALD in children with intestinal failure. This trial was registered at clinicaltrials.gov as NCT00793195.


Assuntos
Emulsões Gordurosas Intravenosas/uso terapêutico , Enteropatias/terapia , Hepatopatias/terapia , Fosfolipídeos/uso terapêutico , Óleo de Soja/uso terapêutico , Bilirrubina/sangue , Emulsões/uso terapêutico , Feminino , Humanos , Lactente , Recém-Nascido , Enteropatias/complicações , Mucosa Intestinal/metabolismo , Intestinos/efeitos dos fármacos , Hepatopatias/complicações , Masculino , Nutrição Parenteral Total , Projetos Piloto , Resultado do Tratamento
13.
Magn Reson Med ; 77(6): 2438-2443, 2017 06.
Artigo em Inglês | MEDLINE | ID: mdl-27364733

RESUMO

PURPOSE: The ability to assess the extracellular pH (pHe) is an important issue in oncology, because extracellular acidification is associated with tumor aggressiveness and resistance to cytotoxic therapies. In this study, a stable triphosphonated triarylmethyl (TPTAM) radical was qualified as a pHe electron paramagnetic resonance (EPR) molecular reporter. METHODS: Calibration of hyperfine splitting as a function of pH was performed using a 1.2-GHz EPR spectrometer. Gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA) was used as an extracellular paramagnetic broadening agent to assess the localization of TPTAM when incubated with cells. In vivo EPR pH-metry was performed in MDA, SiHa, and TLT tumor models and in muscle. Bicarbonate therapy was used to modulate the tumor pHe. EPR measurements were compared with microelectrode readouts. RESULTS: The hyperfine splitting of TPTAM was strongly pH-dependent around the pKa of the probe (pKa = 6.99). Experiments with Gd-DTPA demonstrated that TPTAM remained in the extracellular compartment. pHe was found to be more acidic in the MDA, SiHa, and TLT tumor models compared with muscle. Treatment of animals by bicarbonate induced an increase in pHe in tumors: similar variations in pHe were found when using in vivo EPR or invasive microelectrodes measurements. CONCLUSION: This study demonstrates the potential usefulness of TPTAM for monitoring pHe in tumors. Magn Reson Med 77:2438-2443, 2017. © 2016 International Society for Magnetic Resonance in Medicine.


Assuntos
Espectroscopia de Ressonância de Spin Eletrônica/métodos , Radicais Livres/química , Concentração de Íons de Hidrogênio , Técnicas de Sonda Molecular , Sondas Moleculares/química , Neoplasias Experimentais/química , Neoplasias Experimentais/diagnóstico , Algoritmos , Animais , Humanos , Células K562 , Masculino , Camundongos , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
14.
Neoplasia ; 18(12): 742-752, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27889643

RESUMO

The study of alterations of tumor metabolism should allow the identification of new targets for innovative anticancer strategies. Metabolic alterations are generally established in vitro, and conclusions are often extrapolated to the in vivo situation without further tumor metabolic phenotyping. To highlight the key role of microenvironment on tumor metabolism, we studied the response of glycolytic and oxidative tumor models to metabolic modulations in vitro and in vivo. MDA-MB-231 and SiHa tumor models, characterized in vitro as glycolytic and oxidative, respectively, were studied. Theoretically, when passing from a hypoxic state to an oxygenated state, a Warburg phenotype should conserve a glycolytic metabolism, whereas an oxidative phenotype should switch from glycolytic to oxidative metabolism (Pasteur effect). This challenge was applied in vitro and in vivo to evaluate the impact of different oxic conditions on glucose metabolism. 18F-fluorodeoxyglucose uptake, lactate production, tumor oxygenation, and metabolic fluxes were monitored in vivo using positron emission tomography, microdialysis, electron paramagnetic resonance imaging, and 13C-hyperpolarizated magnetic resonance spectroscopy, respectively. In vitro, MDA-MB-231 cells were glycolytic under both hypoxic and oxygenated conditions, whereas SiHa cells underwent a metabolic shift after reoxygenation. On the contrary, in vivo, the increase in tumor oxygenation (induced by carbogen challenge) led to a similar metabolic shift in glucose metabolism in both tumor models. The major discordance in metabolic patterns observed in vitro and in vivo highlights that any extrapolation of in vitro metabolic profiling to the in vivo situation should be taken cautiously and that metabolic phenotyping using molecular imaging is mandatory in vivo.


Assuntos
Metaboloma , Imagem Multimodal , Neoplasias/diagnóstico por imagem , Neoplasias/metabolismo , Animais , Linhagem Celular Tumoral , Modelos Animais de Doenças , Espectroscopia de Ressonância de Spin Eletrônica , Glucose/metabolismo , Glicólise , Xenoenxertos , Humanos , Espectroscopia de Ressonância Magnética , Oxirredução , Oxigênio/metabolismo , Fenótipo , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada
15.
J Pediatr Gastroenterol Nutr ; 62(5): 734-8, 2016 05.
Artigo em Inglês | MEDLINE | ID: mdl-26529345

RESUMO

OBJECTIVES: The diagnosis of coeliac disease (CD) remains sometimes difficult because the histological criteria are not fully met. The aim of this study was to refine histological diagnostic criteria of CD. METHODS: One hundred seventy-five duodenal bulb D1 (n = 79) and duodenal D2 (n = 96) biopsies of 96 patients with CD (58 girls, mean age 7 years), 135 normal D2 biopsies (69 girls, mean age 12 years), and 64 D2 biopsies of other digestive disorders (DDs) (39 girls, mean age 13 years) obtained from children during a period of 4 years were reviewed. RESULTS: Interobserver agreement was greater for the classification of Corazza-Villanacci than for Marsh-Oberhuber (κ = 0.812 vs κ = 0.409, respectively). Between 40 and 70 intraepithelial lymphocytes (IELs) per 100 epithelial cells (ECs), 32% of patients were CD, whereas 50% had other DD. Above 70 IELs per 100 EC, 53% were CD, and only 6% had other DD. In CD, IELs were significantly located above EC nuclei compared with other DD, (12 IELs/100 EC vs 2 IELs/100 EC, respectively). In 21% of CD cases, D2 were normal and the diagnosis could only be made on D1. Finally, 6% of CD cases showed isolated increase of IELs in D1 without architectural modification. CONCLUSIONS: D1 allowed diagnosis of CD in 21% of cases and IEL >70 per 100 EC correlated strongly with CD. Between 40 and 70 IELs per 100 EC, CD is very likely but other DD must be considered. Finally, the preferential localisation of IELs above EC nuclei favours CD, and increased IEL in D1 may be the sole abnormality.


Assuntos
Doença Celíaca/diagnóstico , Índice de Gravidade de Doença , Adolescente , Biópsia , Doença Celíaca/patologia , Criança , Duodeno/patologia , Diagnóstico Precoce , Feminino , Humanos , Mucosa Intestinal/patologia , Masculino , Valor Preditivo dos Testes
16.
Medicine (Baltimore) ; 93(29): e327, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25546680

RESUMO

Hereditary multiple intestinal atresia (HMIA) is a rare cause of intestinal obstruction in humans associated with a profound combined immune deficiency. Deleterious mutations of the tetratricopeptide repeat domain-7A (TTC7A) gene lead to HMIA, although the mechanism(s) causing the disease in TTC7A deficiency has (have) not yet been clearly identified. To evaluate the consequences of TTC7A deficiency, we studied the morphology of several organs from HMIA patients at different developmental stages, as well as the expression of the TTC7A protein. We performed histological and immunohistochemical analyses on biopsies and autopsies of 6 patients and 1 fetus with HMIA. Moreover, we characterized for the first time the expression of the TTC7A protein by immunostaining it in several organs from control (including fetal samples), infants, and 1 fetus with HMIA. Besides the gastrointestinal tract, HMIA disease was associated with morphological alterations in multiple organs: thymus, lung, spleen, and liver. Moreover, we demonstrated that normal TTC7A protein was expressed in the cytoplasm of epithelial cells of the intestine, thymus, and pancreas. Surprisingly, altered TTC7A protein was highly expressed in tissues from patients, mainly in the epithelial cells. We have established that HMIA associated with a TTC7A defect is characterized by multiorgan impairments. Overall, this report suggests that TTC7A protein is critical for the proper development, preservation, and/or function of thymic and gastrointestinal epithelium.


Assuntos
Síndromes de Imunodeficiência/genética , Atresia Intestinal/genética , Mutação , Proteínas/genética , Apoptose , Atrofia , Calcinose , Canadá , Estudos de Casos e Controles , Estudos de Coortes , Células Epiteliais/metabolismo , Células Epiteliais/patologia , Feminino , Feto , Humanos , Imuno-Histoquímica , Lactente , Recém-Nascido , Mucosa Intestinal/patologia , Obstrução Intestinal/etiologia , Intestinos/anormalidades , Fígado/patologia , Pulmão/patologia , Macrófagos/metabolismo , Masculino , Insuficiência de Múltiplos Órgãos/etiologia , Proteínas/metabolismo , Baço/patologia , Timo/patologia
17.
Appl Physiol Nutr Metab ; 39(7): 745-53, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-24766203

RESUMO

Short bowel syndrome develops when the remnant mass of functioning enterocytes following massive resections cannot support growth or maintain fluid-electrolyte balance and requires parenteral nutrition. Resection itself stimulates the intestine's inherent ability to adapt morphologically and functionally. The capacity to change is very much related to the high turnover rate of enterocytes and is mediated by several signals; these signals are mediated in large part by enteral nutrition. Early initiation of enteral feeding, close clinical monitoring, and ongoing assessment of intestinal adaptation are key to the prevention of irreversible intestinal failure. The length of the functional small bowel remnant is the most important variable affecting outcome. The major objective of intestinal rehabilitation programs is to achieve early oral nutritional autonomy while maintaining normal growth and nutrition status and minimizing total parenteral nutrition related comorbidities such as chronic progressive liver disease. Remarkable progress has been made in terms of survivability and quality of life, especially in the context of coordinated multidisciplinary programs, but much work remains to be done.


Assuntos
Alimentos , Apoio Nutricional , Síndrome do Intestino Curto/terapia , Pré-Escolar , Humanos , Lactente , Recém-Nascido
18.
Adv Exp Med Biol ; 789: 281-288, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23852506

RESUMO

The aim of the study was to sensitively monitor changes in tumor oxygen using the MOBILE (mapping of oxygen by imaging lipids relaxation enhancement) technique. This method was applied in mammary tumor mouse models on an 11.7T Bruker MRI system. MOBILE was compared with functional imaging R2*, R1 of water and with pO2 measurements (using EPR oximetry and O2-dependent fluorescence quenching measurements). MOBILE was shown to be capable to monitor changes in oxygenation in tumor tissues.


Assuntos
Neoplasias da Mama/metabolismo , Oxigênio/metabolismo , Animais , Feminino , Xenoenxertos , Humanos , Aumento da Imagem/métodos , Metabolismo dos Lipídeos , Imageamento por Ressonância Magnética/métodos , Camundongos , Camundongos Nus
19.
J Med Genet ; 50(5): 324-9, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23423984

RESUMO

BACKGROUND: Congenital multiple intestinal atresia (MIA) is a severe, fatal neonatal disorder, involving the occurrence of obstructions in the small and large intestines ultimately leading to organ failure. Surgical interventions are palliative but do not provide long-term survival. Severe immunodeficiency may be associated with the phenotype. A genetic basis for MIA is likely. We had previously ascertained a cohort of patients of French-Canadian origin, most of whom were deceased as infants or in utero. The goal of the study was to identify the molecular basis for the disease in the patients of this cohort. METHODS: We performed whole exome sequencing on samples from five patients of four families. Validation of mutations and familial segregation was performed using standard Sanger sequencing in these and three additional families with deceased cases. Exon skipping was assessed by reverse transcription-PCR and Sanger sequencing. RESULTS: Five patients from four different families were each homozygous for a four base intronic deletion in the gene TTC7A, immediately adjacent to a consensus GT splice donor site. The deletion was demonstrated to have deleterious effects on splicing causing the skipping of the attendant upstream coding exon, thereby leading to a predicted severe protein truncation. Parents were heterozygous carriers of the deletion in these families and in two additional families segregating affected cases. In a seventh family, an affected case was compound heterozygous for the same 4bp deletion and a second missense mutation p.L823P, also predicted as pathogenic. No other sequenced genes possessed deleterious variants explanatory for all patients in the cohort. Neither mutation was seen in a large set of control chromosomes. CONCLUSIONS: Based on our genetic results, TTC7A is the likely causal gene for MIA.


Assuntos
Etnicidade/genética , Exoma/genética , Atresia Intestinal/genética , Proteínas/genética , Sequência de Aminoácidos , Sequência de Bases , Homozigoto , Humanos , Atresia Intestinal/etnologia , Dados de Sequência Molecular , Mutação de Sentido Incorreto/genética , Linhagem , Quebeque , Alinhamento de Sequência , Análise de Sequência de DNA
20.
Paediatr Child Health ; 18(7): 357-9, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24421709

RESUMO

The present case report describes the clinical problems encountered over a five-month period in an infant born with jejunal atresia, extensive midgut volvulus and a microcolon. After an initial surgical resection, the patient had no remaining ileum and his ileocecal valve was also removed. The patient had 35 cm of jejunum, which was successfully lengthened to 60 cm using enteral nutrition and two bowel-lengthening procedures (serial transverse enteropathy procedures). Bouts of cholestatic liver disease, sepsis and small bowel bacterial overgrowth were vigorously treated. The patient was discharged at 5.5 months of age and is now 40 months of age. He is at the 50th percentile for both height and weight, and is developing normally. The outcome for infants with short bowel syndrome has improved significantly in the past few years due to intestinal rehabilitation programs, which integrate nutritional, surgical and pharmacological approaches tailored to individual needs.


Le présent rapport de cas décrit les problèmes cliniques observés pendant une période de cinq mois chez un nourrisson né avec une atrésie jéjunale, un volvulus étendu de l'intestin moyen et un microcôlon. Après une résection chirurgicale initiale, le patient n'avait plus d'iléon et de valve iléocæcale. Il lui restait 40 cm de jéjunum, lequel a pu être allongé à 60 cm grâce à une alimentation entérale et à deux interventions d'allongement intestinal (interventions entéropathiques transverses sérielles). Les épisodes de cholestase intrahépatique, de septicémie et de prolifération bactérienne dans l'intestin grêle ont fait l'objet d'un traitement énergique. Le patient a obtenu son congé à 5,5 mois et en a maintenant 40. Il se situe au 50e percentile sur le plan de la taille et du poids et se développe normalement. Les issues des nourrissons présentant un syndrome de l'intestin court se sont considérablement améliorées ces dernières années, grâce à des programmes de réadaptation intestinale qui intègrent des approches nutritionnelles, chirurgicales et pharmacologiques adaptées à leurs besoins.

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