1
|
Douchin J, Nogueira de Almeida LG, Gonneaud A, Boisvert FM, Dufour A, Giroux V. A153 PYCRL LACTYLATION AS A POTENTIAL REGULATOR OF CANCER STEM CELL METABOLISM IN ESOPHAGEAL SQUAMOUS CELL CARCINOMA (ESCC). J Can Assoc Gastroenterol 2023. [PMCID: PMC9991381 DOI: 10.1093/jcag/gwac036.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Background Patients with esophageal malignancy have a 5-year survival rate of only 14% in Canada. This high mortality rate is due to three factors: late diagnosis, difficulty in surgically removing the tumor because of its localization, and treatment resistance. Resistance can be developed after prolonged exposure to anti-cancer drugs and/or radiation. Indeed 30% of patients will not respond to treatment or will relapse. Resistance has been mainly ascribed to the presence of cancer stem cells (CSCs) inside the tumor. However, no treatment specifically directed against CSCs is available to patients. Purpose Thus, targeting CSCs is a promising strategy to improve the survival of patients with esophageal squamous cell carcinoma (ESCC), the most common type of esophageal cancer worldwide. Therefore, a better understanding of the molecular mechanisms occurring during long-term exposure to cancer treatments is imperative. Method Herein, we developed an unbiased approach to identify new players in chemotherapy and radiotherapy resistance development in ESCC. We established radio- (R), chemo- (C), and radiochemo-resistant (RC) human ESCC cell lines using prolonged exposure to radiation and/or chemotherapeutic agent 5-FU, respectively. Result(s) The enrichment in CSCs in all treated cell lines was demonstrated by an increase of ALDH1high cells and CD24high/CD44high cells in flow cytometry. We then used a proteomic approach to identify new players in treatment resistance. Interestingly, pathway analysis pointed out to alterations in energy metabolism as well as amino acid metabolism. Seahorse assays showed that resistant cell lines have a lower respiration rate than control cells, while glycolysis remains unchanged. To further characterize these metabolic changes, we performed an unbiased metabolomic study and confirmed a decrease in amino acid levels such as proline, in resistant cell lines. Recently, metabolic regulation has been linked to a new post-translational modification, lactylation. Proteomic data were re-analyzed looking for lactylated protein and found, amongst others, PYCRL, an enzyme implicated in proline biosynthesis, as one of the most differentially lactylated proteins in treated cell lines compared to control. PYCRL lactylation was confirmed using immuno-fluorescence colocalization and immuno-precipitation. Lastly, using AlphaFold, preliminary results point toward the importance of PYCRL lactylation impairing PYCRL homomultimerization. Conclusion(s) To conclude, our results suggest an important role of proline metabolism following long-term treatment in ESCC. This study is a first step toward the identification of new targets to fight treatment resistance in ESCC patients. Please acknowledge all funding agencies by checking the applicable boxes below CAG, CIHR, Other Please indicate your source of funding; FRQ Disclosure of Interest None Declared
Collapse
Affiliation(s)
- J Douchin
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke,Centre de Recherche du CHUS, Sherbrooke
| | - L G Nogueira de Almeida
- Departments of Physiology & Pharmacology and Biochemistry & Molecular Biology, University of Calgary, Calgary
| | - A Gonneaud
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke,Centre de Recherche du CHUS, Sherbrooke
| | - F -M Boisvert
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke,Centre de Recherche du CHUS, Sherbrooke
| | - A Dufour
- Departments of Physiology & Pharmacology and Biochemistry & Molecular Biology, University of Calgary, Sherbrooke, Canada
| | - V Giroux
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke,Centre de Recherche du CHUS, Sherbrooke
| |
Collapse
|
2
|
De Almeida LGN, Rosentreter R, Hirota S, Lu C, Dufour A. A38 INVESTIGATION OF POST-TRANSLATIONAL MODIFICATIONS IN SERUM OF CROHN’S DISEASE PATIENTS USING A PROTEOMICS APPROACH. J Can Assoc Gastroenterol 2023. [PMCID: PMC9991388 DOI: 10.1093/jcag/gwac036.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Background Canada has one of the highest prevalences of Crohn’s disease (CD) worldwide. More specifically, fibrostenotic CD is a phenotype with prolonged chronic inflammation and fibrotic strictures often resistant to anti-inflammatory therapies and characterized by luminal narrowing that ultimately requires surgery. Proteins play an essential role in disease pathogenesis, and post-translational modifications (PTMs) can alter their properties. PTMs have been frequently implicated in human diseases. However, they have yet to be explored in the context of CD, which could lead to new avenues for a better understanding of disease mechanisms and the discovery of biomarkers. Purpose Identify post-translational modifications in serum proteins of CD patients. Method Serum samples from patients with strictures or inflammatory phenotype (without strictures) (n=4 per group), as diagnosed by intestinal ultrasound, were analyzed using a shotgun-proteomics approach. Protein identification and PTM prediction were performed with FragPipe. Identified mass shifts determined by an open search in FragPipe were mapped to possible PTMs and confirmed via unimod.org. Statistical significance analysis was performed with MSstatsPTM. Result(s) The prediction analysis identified 363 potential modification sites, including artifacts and chemical derivatives. The addition of all potential PTMs in the analysis would lead to false positives; therefore, it was selected five of the most abundant mass shifts mapped to true PTMs: cysteine oxidation, serine methylation, and three modifications of the protein n-termini (formaldehyde adduct, carbamylation, and formylation). Standard proteomics analysis identified 3635 unique peptides and 317 unique proteins. The addition of the predicted PTMs increased the number of peptides by 9.8%, reaching 3994 unique sequences. Interestingly, a very subtle increase was observed on the protein level, where only two additional proteins were identified. Of the PTMs identified, methylation of a serine residue on the variable chain of immunoglobulin (IGLV1-47) was statistically enriched in inflammatory samples (5.74 fold change, adj. p-value = 0.041). The variable chain participates in the antigen recognition process, and modification of its amino acids could impact antibody specificity. Additionally, structuring patients showed two modifications on thrombin: oxidation of cysteine and methylation of serine. Thrombin was previously shown to be elevated in CD patients compared to healthy controls. As both modifications were not present in inflammatory patients, they constitute potential biomarkers for specific diagnosis of the structuring disease. Conclusion(s) The observed gain in peptide identification demonstrates the diversification promoted by PTMs and exhibits their importance in proteomics studies. Even though the identified modifications require further validation, they can shed light on new players of CD pathogenesis and suggest novel biomarkers for disease diagnosis. Disclosure of Interest None Declared
Collapse
Affiliation(s)
| | | | - S Hirota
- Department of Physiology and Pharmacology,Department of Microbiology, Immunology & Infectious Diseases, University of Calgary, Calgary, Canada
| | | | - A Dufour
- Department of Biochemistry and Molecular Biology,Department of Physiology and Pharmacology
| |
Collapse
|
3
|
Voigt AL, Dardari R, Lara NLM, He T, Steele H, Dufour A, Orwig KE, Dobrinski I. Multiomics approach to profiling Sertoli cell maturation during development of the spermatogonial stem cell niche. Mol Hum Reprod 2023; 29:gaad004. [PMID: 36688722 PMCID: PMC9976880 DOI: 10.1093/molehr/gaad004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 11/10/2022] [Indexed: 01/24/2023] Open
Abstract
Spermatogonial stem cells (SSCs) are the basis of spermatogenesis, a complex process supported by a specialized microenvironment, called the SSC niche. Postnatal development of SSCs is characterized by distinct metabolic transitions from prepubertal to adult stages. An understanding of the niche factors that regulate these maturational events is critical for the clinical application of SSCs in fertility preservation. To investigate the niche maturation events that take place during SSC maturation, we combined different '-omics' technologies. Serial single cell RNA sequencing analysis revealed changes in the transcriptomes indicative of niche maturation that was initiated at 11 years of age in humans and at 8 weeks of age in pigs, as evident by Monocle analysis of Sertoli cells and peritubular myoid cell (PMC) development in humans and Sertoli cell analysis in pigs. Morphological niche maturation was associated with lipid droplet accumulation, a characteristic that was conserved between species. Lipidomic profiling revealed an increase in triglycerides and a decrease in sphingolipids with Sertoli cell maturation in the pig model. Quantitative (phospho-) proteomics analysis detected the activation of distinct pathways with porcine Sertoli cell maturation. We show here that the main aspects of niche maturation coincide with the morphological maturation of SSCs, which is followed by their metabolic maturation. The main aspects are also conserved between the species and can be predicted by changes in the niche lipidome. Overall, this knowledge is pivotal to establishing cell/tissue-based biomarkers that could gauge stem cell maturation to facilitate laboratory techniques that allow for SSC transplantation for restoration of fertility.
Collapse
Affiliation(s)
- A L Voigt
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - R Dardari
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - N L M Lara
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - T He
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - H Steele
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - A Dufour
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Canada
| | - K E Orwig
- Department of Obstetrics, Gynecology and Reproductive Sciences, Magee-Women’s Research Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - I Dobrinski
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| |
Collapse
|
4
|
Voigt AL, Dardari R, Su L, Lara NLM, Sinha S, Jaffer A, Munyoki SK, Alpaugh W, Dufour A, Biernaskie J, Orwig KE, Dobrinski I. Metabolic transitions define spermatogonial stem cell maturation. Hum Reprod 2022; 37:2095-2112. [PMID: 35856882 PMCID: PMC9614685 DOI: 10.1093/humrep/deac157] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 06/23/2022] [Indexed: 11/13/2022] Open
Abstract
STUDY QUESTION Do spermatogonia, including spermatogonial stem cells (SSCs), undergo metabolic changes during prepubertal development? SUMMARY ANSWER Here, we show that the metabolic phenotype of prepubertal human spermatogonia is distinct from that of adult spermatogonia and that SSC development is characterized by distinct metabolic transitions from oxidative phosphorylation (OXPHOS) to anaerobic metabolism. WHAT IS KNOWN ALREADY Maintenance of both mouse and human adult SSCs relies on glycolysis, while embryonic SSC precursors, primordial germ cells (PGCs), exhibit an elevated dependence on OXPHOS. Neonatal porcine SSC precursors reportedly initiate a transition to an adult SSC metabolic phenotype at 2 months of development. However, when and if such a metabolic transition occurs in humans is ambiguous. STUDY DESIGN, SIZE, DURATION To address our research questions: (i) we performed a meta-analysis of publicly available and newly generated (current study) single-cell RNA sequencing (scRNA-Seq) datasets in order to establish a roadmap of SSC metabolic development from embryonic stages (embryonic week 6) to adulthood in humans (25 years of age) with a total of ten groups; (ii) in parallel, we analyzed single-cell RNA sequencing datasets of isolated pup (n = 3) and adult (n = 2) murine spermatogonia to determine whether a similar metabolic switch occurs; and (iii) we characterized the mechanisms that regulate these metabolic transitions during SSC maturation by conducting quantitative proteomic analysis using two different ages of prepubertal pig spermatogonia as a model, each with four independently collected cell populations. PARTICIPANTS/MATERIALS, SETTING, METHODS Single testicular cells collected from 1-year, 2-year and 7-year-old human males and sorted spermatogonia isolated from 6- to 8-day (n = 3) and 4-month (n = 2) old mice were subjected to scRNA-Seq. The human sequences were individually processed and then merged with the publicly available datasets for a meta-analysis using Seurat V4 package. We then performed a pairwise differential gene expression analysis between groups of age, followed by pathways enrichment analysis using gene set enrichment analysis (cutoff of false discovery rate < 0.05). The sequences from mice were subjected to a similar workflow as described for humans. Early (1-week-old) and late (8-week-old) prepubertal pig spermatogonia were analyzed to reveal underlying cellular mechanisms of the metabolic shift using immunohistochemistry, western blot, qRT-PCR, quantitative proteomics, and culture experiments. MAIN RESULTS AND THE ROLE OF CHANCE Human PGCs and prepubertal human spermatogonia show an enrichment of OXPHOS-associated genes, which is downregulated at the onset of puberty (P < 0.0001). Furthermore, we demonstrate that similar metabolic changes between pup and adult spermatogonia are detectable in the mouse (P < 0.0001). In humans, the metabolic transition at puberty is also preceded by a drastic change in SSC shape at 11 years of age (P < 0.0001). Using a pig model, we reveal that this metabolic shift could be regulated by an insulin growth factor-1 dependent signaling pathway via mammalian target of rapamycin and proteasome inhibition. LARGE SCALE DATA New single-cell RNA sequencing datasets obtained from this study are freely available through NCBI GEO with accession number GSE196819. LIMITATIONS, REASONS FOR CAUTION Human prepubertal tissue samples are scarce, which led to the investigation of a low number of samples per age. Gene enrichment analysis gives only an indication about the functional state of the cells. Due to limited numbers of prepubertal human spermatogonia, porcine spermatogonia were used for further proteomic and in vitro analyses. WIDER IMPLICATIONS OF THE FINDINGS We show that prepubertal human spermatogonia exhibit high OXHPOS and switch to an adult-like metabolism only after 11 years of age. Prepubescent cancer survivors often suffer from infertility in adulthood. SSC transplantation could provide a powerful tool for the treatment of infertility; however, it requires high cell numbers. This work provides key insight into the dynamic metabolic requirements of human SSCs across development that would be critical in establishing ex vivo systems to support expansion and sustained function of SSCs toward clinical use. STUDY FUNDING/COMPETING INTEREST(S) This work was funded by the NIH/NICHD R01 HD091068 and NIH/ORIP R01 OD016575 to I.D. K.E.O. was supported by R01 HD100197. S.K.M. was supported by T32 HD087194 and F31 HD101323. The authors declare no conflict of interest.
Collapse
Affiliation(s)
- A L Voigt
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - R Dardari
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - L Su
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - N L M Lara
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - S Sinha
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - A Jaffer
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - S K Munyoki
- Department of Obstetrics, Gynecology and Reproductive Sciences, Magee-Womens Research Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - W Alpaugh
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - A Dufour
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB, Canada
| | - J Biernaskie
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - K E Orwig
- Department of Obstetrics, Gynecology and Reproductive Sciences, Magee-Womens Research Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - I Dobrinski
- Correspondence address. Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada. E-mail:
| |
Collapse
|
5
|
Abdullah N, Defaye M, Hassan A, Cumenal M, Iftinca M, Young D, Ohland CL, Dufour A, McCoy K, Altier C. A230 THE ROLE OF THE MICROBIOTA IN NOCICEPTOR DEVELOPMENT AND PAIN SENSITIVITY. J Can Assoc Gastroenterol 2022. [PMCID: PMC8859168 DOI: 10.1093/jcag/gwab049.229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background Pain is the most common cause of disability in IBD. What causes inter-individual variability in chronic pain after successful treatment of inflammation remains elusive. We have shown that activation of TRPV1+ colonic nociceptors is essential for the establishment of persistent pain in DSS colitis. Nociceptor development coincides with microbial colonization, while early life dysbiosis can lead to visceral hypersensitivity in adulthood. Whether the microbiota dictates nociceptor development and pain susceptibility remains unknown. Here we test the hypothesis that the microbiota programs nociceptor specification during early development, rendering them more susceptible to sensitization later in life. We have identified the aryl hydrocarbon receptor (AHR) that senses bacterial-derived metabolites as a candidate target that orchestrates transcriptional regulation in nociceptors. Aims We investigated the developmental regulation of nociceptors by the microbiome and how it influences pain sensitivity. We will determine the effects of AHR activation on nociceptor lineage and function as well as the long term impact of AHR signaling on pain sensitivity. Methods We have developed a germ-free (GF) TRPV1-GFP reporter mouse that was used to phenotype and visualise TRPV1+ nociceptors in the absence of a microbiota. We will isolate TRPV1+ neurons by FACS to identify genes that are under the control of the microbiota and to characterise the phosphoproteome of TRPV1+ nociceptors in GF conditions. Finally, we will investigate the role of AHR signaling in nociceptors both acutely and during development. Results We showed a reduction in thermal pain threshold and a reduction in capsaicin test responses in GF mice. The number and size of DRG neurons was unchanged in GF mice. Examination of molecular markers for peptidergic (CGRP) and non-peptidergic (IB4) neurons did not show a difference. Finally, there was no difference in the expression of TRPV1, suggesting post-translational modification of the channel. In cultured DRG neurons, we found a decrease in capsaicin induced action potentials and a decrease in the amplitude of the capsaicin response in GF mice. Using RNAscope, we showed that TRPV1+ neurons express AHR. Conclusions Our results highlight the importance of bacterial composition in regulating the development of nociceptors and pain sensitivity in adulthood. Furthermore, we are the first to demonstrate the expression of AHR in sensory neurons. These findings point to a role of the microbiota in programming nociceptors during development. My work will advance our understanding of the role of commensal bacteria in regulating pain and could lead to recommendations for the treatment of neonates in early life to reduce their risk of developing chronic pain later in life. Funding Agencies CAG, CIHR
Collapse
Affiliation(s)
- N Abdullah
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - M Defaye
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - A Hassan
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - M Cumenal
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - M Iftinca
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - D Young
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - C L Ohland
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - A Dufour
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - K McCoy
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - C Altier
- Physiology and Pharmacology, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| |
Collapse
|
6
|
Douchin J, Nogueira de Almeida L, Gonneaud A, Boisvert F, Dufour A, Giroux V. A3 TARGETING PROLINE METABOLISM TO OVERCOME TREATMENT RESISTANCE IN ESOPHAGEAL CANCER. J Can Assoc Gastroenterol 2022. [PMCID: PMC8859203 DOI: 10.1093/jcag/gwab049.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background Patients with esophageal malignancy have a 5-year survival rate of only 14% in Canada. This high mortality rate is due to three factors: late diagnosis, difficulty to surgically remove the tumor due to its localization and treatment resistance. Treatment resistance has been ascribed to the presence of cancer stem cells (CSCs) inside the tumor. However, no treatment specifically directed against CSCs is available to patients. Therefore, targeting CSCs is a promising strategy to improve survival of patients with esophageal squamous cell carcinoma (ESCC), the most common type of esophageal cancer worldwide. Aims Herein, we developed an unbiased approach to identify new players in chemotherapy and radiotherapy resistance in ESCC. Methods We established radioresistant (RR), chemoresistant (CR) and radiochemoresistant (RCR) human ESCC cell lines using weekly radiation and/or continuous treatment with increasing doses of chemotherapeutic agent 5-FU. We validated that the process of resistance acquisition correlates with enrichment in CSCs as revealed by higher ALDH1 expression, and increased proportion of ALDH1high cells and CD24high/CD44high cells in flow cytometry. We then used a proteomic approach to identify new players in treatment resistance. Results Interestingly, pathway analysis demonstrated enrichment in energy metabolism as well as amino acid metabolism. Seahorse assays showed a more quiescent metabolism in all three types of resistant cells compared to the control cell line. More precisely, resistant cell lines have a lower respiration rate than control cell line, while glycolysis remains unchanged. Surprisingly, our results show a metabolic rewiring very different from the well-known Warburg effect. To further characterise these metabolic changes, we performed an unbiased metabolomic pilot study and confirmed a decrease in amino acid levels such as proline, in resistant cell lines. Preliminary data show that when cultured in DMEM with proline addition, CD44high/CD24high cell proportion is decreased in control and RR cell lines suggesting that proline is a key regulator of CSC population in ESCC. Conclusions To conclude, our results suggest an important role of metabolism in ESCC treatment resistance. This study is a first step towards the identification of new targets to fight treatment resistance in ESCC patients. Funding Agencies CAG, CIHRCanada research chair TIER 2
Collapse
Affiliation(s)
- J Douchin
- Biologie cellulaire, Université de Sherbrooke, Sherbrooke, QC, Canada
| | | | - A Gonneaud
- Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - F Boisvert
- Anatomy and Cell Biology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - A Dufour
- University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - V Giroux
- Immunology and Cell Biology, Université de Sherbrooke, Sherbrooke, QC, Canada
| |
Collapse
|
7
|
Juurikka K, Dufour A, Pehkonen K, Mainoli B, Campioni Rodrigues P, Solis N, Klein T, Nyberg P, Overall CM, Salo T, Åström P. MMP8 increases tongue carcinoma cell-cell adhesion and diminishes migration via cleavage of anti-adhesive FXYD5. Oncogenesis 2021; 10:44. [PMID: 34059618 PMCID: PMC8167110 DOI: 10.1038/s41389-021-00334-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/03/2021] [Accepted: 05/14/2021] [Indexed: 12/28/2022] Open
Abstract
Matrix metalloproteinases (MMPs) modify bioactive factors via selective processing or degradation resulting in tumour-promoting or tumour-suppressive effects, such as those by MMP8 in various cancers. We mapped the substrates of MMP8 to elucidate its previously shown tumour-protective role in oral tongue squamous cell carcinoma (OTSCC). MMP8 overexpressing (+) HSC-3 cells, previously demonstrated to have reduced migration and invasion, showed enhanced cell-cell adhesion. By analysing the secretomes of MMP8 + and control cells with terminal amine isotopic labelling of substrates (TAILS) coupled with liquid chromatography and tandem mass spectrometry (LC-MS/MS), we identified 36 potential substrates of MMP8, including FXYD domain-containing ion transport regulator 5 (FXYD5). An anti-adhesive glycoprotein FXYD5 has been previously shown to predict poor survival in OTSCC. Cleavage of FXYD5 by MMP8 was confirmed using recombinant proteins. Furthermore, we detected a loss of FXYD5 levels on cell membrane of MMP8 + cells, which was rescued by inhibition of the proteolytic activity of MMP8. Silencing (si) FXYD5 increased the cell-cell adhesion of control but not that of MMP8 + cells. siFXYD5 diminished the viability and motility of HSC-3 cells independent of MMP8 and similar effects were seen in another tongue cancer cell line, SCC-25. FXYD5 is a novel substrate of MMP8 and reducing FXYD5 levels either with siRNA or cleavage by MMP8 increases cell adhesion leading to reduced motility. FXYD5 being a known prognostic factor in OTSCC, our findings strengthen its potential as a therapeutic target.
Collapse
Affiliation(s)
- K Juurikka
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - A Dufour
- Department of Physiology & Pharmacology, University of Calgary, Calgary, Canada.,Department of Oral Biological and Medical Sciences, Faculty of Dentistry, Centre for Blood Research, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, Canada
| | - K Pehkonen
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - B Mainoli
- Department of Physiology & Pharmacology, University of Calgary, Calgary, Canada
| | - P Campioni Rodrigues
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - N Solis
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, Centre for Blood Research, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, Canada
| | - T Klein
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, Centre for Blood Research, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, Canada
| | - P Nyberg
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland.,Biobank Borealis of Northern Finland, Oulu University Hospital, Oulu, Finland
| | - C M Overall
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, Centre for Blood Research, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, Canada
| | - T Salo
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland.,Department of Oral and Maxillofacial Diseases, Faculty of Medicine, University of Helsinki, Helsinki, Finland.,Helsinki University Hospital, Helsinki, Finland.,Translational Immunology Research Program (TRIMM), University of Helsinki, Helsinki, Finland
| | - P Åström
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland. .,Department of Oral Biological and Medical Sciences, Faculty of Dentistry, Centre for Blood Research, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, Canada. .,Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Oulu, Finland.
| |
Collapse
|
8
|
Nogueira de Almeida L, Mainoli B, Filyk AK, Hirota SA, Lu C, Dufour A. A37 EXPLORING THE PROTEOMICS DIFFERENCES IN CROHN’S DISEASE PATIENTS. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Canada has the highest prevalence rate of Crohn’s disease (CD) in North America. In Alberta, the yearly cost of anti-inflammatory drugs can be more than $25,000 per person; however, half of the patients do not respond to medication. CD is characterized by lesions in the small intestine due to inflammation, promoting diarrhea and abdominal pain. Prolonged chronic inflammation results in fibrotic strictures that are resistant to anti-inflammatory therapies and promote narrowing of the luminal space that ultimately require surgery. Currently, there is no biomarker to distinguish between the inflammatory or stricturing phenotype.
Aims
AIM 1: Profile serum samples from CD patients using a label-free shotgun-proteomics.
AIM 2: Identify signatures and biomarkers that distinguish inflammatory and fibrotic strictures using a bioinformatics approach.
Methods
Serum samples from 15 CD patients with strictures and 15 CD patients without strictures (inflammatory phenotype), as diagnosed by ultrasound imaging, were analyzed by a standard shotgun-proteomics approach. Briefly, 200 µg of serum proteins were processed in a label-free protocol in combination with the filter-aided sample preparation (FASP) method. Liquid chromatography-tandem mass spectrometry was performed on an Orbitrap Fusion Lumos. Protein identification was accomplished by MaxQuant at a 1% false-discovery rate. Statistical significance was determined by the MSstats package, in the R software. To identify the biological significance of disturbed pathways, it was characterized by the protein-protein interactions and pathway enrichment analysis using String-DB and Metascape.
Results
It was identified a statistically significant protein panel between the two phenotypes. Proteins identified in the strictured group include JAK1 (Tyrosine-protein kinase), CD5 antigen-like protein (regulates inflammatory gene expression in Th17 cells), and neogenin (cell adhesion). Of the inflammatory patients, there was a significant elevation of PFK/FBPase 2 (synthesis and degradation of fructose 2,6-bisphosphate), vinculin (cell-matrix adhesion) and MMP-16/MT3-MMP (matrix metalloproteinase).
Conclusions
The identification of a distinct signature between both phenotypes provide important biological information about the disease progression and are a good sign that a biomarker discovery platform will be capable to differentiate between inflammatory and fibrostenotic strictures from serum samples of CD patients.
Funding Agencies
CAG, CIHRNSERC
Collapse
Affiliation(s)
| | - B Mainoli
- University College Dublin School of Medicine, Dublin, Ireland
| | - A K Filyk
- University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - S A Hirota
- University of Calgary Department of Physiology & Pharmacology, Calgary, AB, Canada
| | - C Lu
- University of Calgary Department of Medicine, Calgary, AB, Canada
| | - A Dufour
- University of Calgary Department of Physiology & Pharmacology, Calgary, AB, Canada
| |
Collapse
|
9
|
Abstract
Abstract
Background
Crohn’s disease (CD) is an incurable relapsing-remitting inflammatory bowel disease (IBD) where patients may experience bowel damage with symptoms such as abdominal pain, chronic diarrhea, extraintestinal manifestations and life-long disability. CD is heterogeneous with three distinct phenotypes including a stricturing phenotype marked by intestinal fibrosis. This fibrotic morphology is generally more unresponsive to drug treatment; delaying a patient’s remission, control of the disease and often requiring surgical intervention. Thus, early and accurate identification of fibrostenosis in CD is important to optimize patient treatment and predict response to therapy.
Aims
The aim of our study is to distinguish inflammatory and intestinal fibrostenosis in CD patients using serum protein biomarkers.
Methods
Blood sera from 17 inflammatory and 17 fibrostenotic CD patients were collected. The phenotypic classification was confirmed by intestinal ultrasound and endoscopy. Samples were subjected to Shotgun Proteomics, an unbiased proteomics approach that allows for relative protein quantification. Proteins from each condition were isotopically labelled with formaldehyde (light +28 Da and heavy +34 Da), pooled and digested with trypsin. Following liquid chromatography and tandem mass spectrometry, peptides were then identified by MaxQuant software with a false discovery rate of 1%. Excel (Microsoft), Prism (Graphpad) and Metascape software were used for data filtering and analysis.
Results
Proteomic processing allowed for the identification of novel protein biomarkers in the inflammatory and stricture CD phenotypes. Inflammation was correlated with activation of the complement pathway and fatty acid metabolism; marked by increased levels of immunoglobulin gamma 4 chain (IGHG4), mitochondrial creatinine kinase (CKMT1), apolipoprotein A (LPA) and glutathione peroxidase 3 (GPX3) proteins. Fibrostenosis showed no distinct metabolic pathway, but an elevated expression of SWI/SNF-related matric associated actin (SMARCA5), haptoglobin related protein (HPR), immunoglobulin kappa and immunoglobulin heavy constant proteins.
Conclusions
Our data indicate that inflammation and strictures in CD may be driven by distinct signaling pathways. We identified specific protein signatures for the two phenotypes, which may aid in predicting those who are at risk of developing strictures and in the development of phenotype-specific treatment for CD patients. Future validation of these proteins will be performed to assess this unique protein profile.
Funding Agencies
McCaig Institute for Bone and Joint Health
Collapse
Affiliation(s)
- B Mainoli
- University of Calgary, Calgary, AB, Canada
| | - A K Filyk
- Life Sciences, Queen’s University, Kingston, ON, Canada
| | - C Lu
- Medicine, University of Calgary Cumming School of Medicine, Calgary, AB, Canada
| | - A Dufour
- University of Calgary, Calgary, AB, Canada
| |
Collapse
|
10
|
Lu C, Dufour A, Ueno A, Jijon H, Prowse K, Novak KL, Panaccione R, Hirota SA. A13 PROTEINS AND FIBROSTENOTIC CROHN’S DISEASE; WHO SHOWED UP TO THE PARTY? J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- C Lu
- Gastroenterology, University of Calgary, Calgary AB, AB, Canada
| | - A Dufour
- Gastroenterology, University of Calgary, Calgary AB, AB, Canada
| | - A Ueno
- Gastroenterology, University of Calgary, Calgary AB, AB, Canada
| | - H Jijon
- Gastroenterology, University of Calgary, Calgary AB, AB, Canada
| | - K Prowse
- McMaster University, Hamilton, AB, Canada
| | - K L Novak
- Gastroenterology, University of Calgary, Calgary AB, AB, Canada
| | - R Panaccione
- Gastroenterology, University of Calgary, Calgary AB, AB, Canada
| | - S A Hirota
- Physiology & Pharmacology, University of Calgary, Calgary, AB, Canada
| |
Collapse
|
11
|
Gordon M, Dufour A, MacNaughton W. A35 NEUTROPHIL ELASTASE PROTEOLYTIC ACTIVITY DRIVES A NOVEL PRO-RESOLUTION CELL MIGRATION PHENOTYPE. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M Gordon
- University of Calgary, Calgary, AB, Canada
| | - A Dufour
- University of Calgary, Calgary, AB, Canada
| | | |
Collapse
|
12
|
Cloarec R, Riffault B, Dufour A, Rabiei H, Gouty-Colomer LA, Dumon C, Guimond D, Bonifazi P, Eftekhari S, Lozovaya N, Ferrari DC, Ben-Ari Y. Pyramidal neuron growth and increased hippocampal volume during labor and birth in autism. Sci Adv 2019; 5:eaav0394. [PMID: 30746473 PMCID: PMC6357736 DOI: 10.1126/sciadv.aav0394] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 12/10/2018] [Indexed: 06/09/2023]
Abstract
We report that the apical dendrites of CA3 hippocampal pyramidal neurons are increased during labor and birth in the valproate model of autism but not in control animals. Using the iDISCO clearing method, we show that hippocampal, especially CA3 region, and neocortical volumes are increased and that the cerebral volume distribution shifts from normal to lognormal in valproate-treated animals. Maternal administration during labor and birth of the NKCC1 chloride transporter antagonist bumetanide, which reduces [Cl-]i levels and attenuates the severity of autism, abolished the neocortical and hippocampal volume changes and reduced the whole-brain volume in valproate-treated animals. These results suggest that the abolition of the oxytocin-mediated excitatory-to-inhibitory shift of GABA actions during labor and birth contributes to the pathogenesis of autism spectrum disorders by stimulating growth during a vulnerable period.
Collapse
Affiliation(s)
- R. Cloarec
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - B. Riffault
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - A. Dufour
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - H. Rabiei
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - L.-A. Gouty-Colomer
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - C. Dumon
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - D. Guimond
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - P. Bonifazi
- Biocruces Health Research Institute, Barakaldo, Spain & IKERBASQUE: The Basque Foundation for Science, Bilbao, Spain
| | - S. Eftekhari
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - N. Lozovaya
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - D. C. Ferrari
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| | - Y. Ben-Ari
- Neurochlore, Ben-Ari Institute of Neuroarcheology (IBEN), Zone Luminy Biotech Entreprises, 13288 Cedex 09 , Marseille, France
| |
Collapse
|
13
|
Leone C, Dufour A, Fasolino A, Truini A, Cruccu G. Trigeminal small-fibre function assessed with cold evoked potentials (CEPs) in humans. Clin Neurophysiol 2019. [DOI: 10.1016/j.clinph.2018.09.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
14
|
Orkaby A, Yang L, Dufour A, Travison T, Sesso H, Gaziano J, Driver J, Djousse L. LONG-TERM ASPIRIN USE IS ASSOCIATED WITH A LOWER PREVALENCE OF FRAILTY IN MEN: THE PHYSICIANS’ HEALTH STUDY. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- A Orkaby
- GRECC, VA Boston Healthcare System
| | - L Yang
- Institute for Aging Research, Hebrew SeniorLife, Harvard Medical School
| | - A Dufour
- Institute for Aging Research, Hebrew SeniorLife, Harvard Medical School
| | - T Travison
- Hebrew SeniorLife Institute for Aging Research and Assistant Professor of Medicine at Harvard Medical School
| | | | - J Gaziano
- VA Boston Healthcare System; Brigham & Women’s Hospital, Harvard Medical School
| | - J Driver
- GRECC, VA Boston Healthcare System, Boston, MA, USA
| | - L Djousse
- Div. of Aging, Dept. of Medicine, BWH
| |
Collapse
|
15
|
Affiliation(s)
- M. Nowakowska
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville BP 20451, Nancy 54001 Cedex, France
| | - O. Herbinet
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville BP 20451, Nancy 54001 Cedex, France
| | - A. Dufour
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville BP 20451, Nancy 54001 Cedex, France
| | - P. A. Glaude
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville BP 20451, Nancy 54001 Cedex, France
| |
Collapse
|
16
|
Etienne A, Berthon G, Dufour A, Lamoureux B, Fournier P, Rousset E, Parker R, Chopin M, Revest M, Mailles A. Épidémie de fièvre Q en lien avec la fréquentation d’une ferme ouverte au public, Indre, mars à juillet 2017. Med Mal Infect 2018. [DOI: 10.1016/j.medmal.2018.04.276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
17
|
Dufour A, Gontran E, Deroulers C, Varlet P, Pallud J, Grammaticos B, Badoual M. Modeling the dynamics of oligodendrocyte precursor cells and the genesis of gliomas. PLoS Comput Biol 2018; 14:e1005977. [PMID: 29590097 PMCID: PMC5903643 DOI: 10.1371/journal.pcbi.1005977] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 04/17/2018] [Accepted: 01/10/2018] [Indexed: 11/24/2022] Open
Abstract
Oligodendrocyte precursor cells (OPCs) have remarkable properties: they represent the most abundant cycling cell population in the adult normal brain and they manage to achieve a uniform and constant density throughout the adult brain. This equilibrium is obtained by the interplay of four processes: division, differentiation or death, migration and active self-repulsion. They are also strongly suspected to be at the origin of gliomas, when their equilibrium is disrupted. In this article, we present a model of the dynamics of OPCs, first in a normal tissue. This model is based on a cellular automaton and its rules are mimicking the ones that regulate the dynamics of real OPCs. The model is able to reproduce the homeostasis of the cell population, with the maintenance of a constant and uniform cell density and the healing of a lesion. We show that there exists a fair quantitative agreement between the simulated and experimental parameters, such as the cell velocity, the time taken to close a lesion, and the duration of the cell cycle. We present three possible scenarios of disruption of the equilibrium: the appearance of an over-proliferating cell, of a deadless/non-differentiating cell, or of a cell that lost any contact-inhibition. We show that the appearance of an over-proliferating cell is sufficient to trigger the growth of a tumor that has low-grade glioma features: an invasive behaviour, a linear radial growth of the tumor with a corresponding growth velocity of less than 2 mm per year, as well a cell density at the center which exceeds the one in normal tissue by a factor of less than two. The loss of contact inhibition leads to a more high-grade-like glioma. The results of our model contribute to the body of evidence that identify OPCs as possible cells of origin of gliomas. Gliomas are the most common brain tumors and result in more years of life lost than any other tumor. Standard treatments only confer a limited improvement in overall survival, underscoring the need for new therapies. Finding the type of cells at the origin of these tumors could lead to the development of new drugs, specifically targeted towards these cells. The oligodendrocyte precursor cells are suspected to be these cells of origin, because they continue to proliferate through all the adult life. In this article, we present a model of the dynamics of these cells, first in the normal brain, and then we extrapolate our model to the pathological situation. We study several scenarios where, from the normal situation, a cell appears with one property different from those of the normal cells. We show that the alteration of only one of the properties of these cells in the model can lead to the formation of gliomas with different aggressiveness and very similar to real gliomas, reinforcing the suspicion that the precursor cells are at the origin of gliomas.
Collapse
Affiliation(s)
- Aloys Dufour
- IMNC Laboratory, CNRS, Univ Paris Saclay, Univ Paris-Sud, Univ Paris Diderot, France
| | - Emilie Gontran
- IMNC Laboratory, CNRS, Univ Paris Saclay, Univ Paris-Sud, Univ Paris Diderot, France
| | - Christophe Deroulers
- IMNC Laboratory, CNRS, Univ Paris Saclay, Univ Paris-Sud, Univ Paris Diderot, France
| | - Pascale Varlet
- Department of Neuropathology, Sainte-Anne Hospital, IMA-Brain, INSERM U894, Univ Paris Descartes, Paris, France
| | - Johan Pallud
- Department of Neurosurgery, Sainte-Anne Hospital, IMA-Brain, INSERM U894, Univ Paris Descartes, Paris, France
| | - Basile Grammaticos
- IMNC Laboratory, CNRS, Univ Paris Saclay, Univ Paris-Sud, Univ Paris Diderot, France
| | - Mathilde Badoual
- IMNC Laboratory, CNRS, Univ Paris Saclay, Univ Paris-Sud, Univ Paris Diderot, France
- * E-mail:
| |
Collapse
|
18
|
Abstract
It has been proposed that the 2-D motion signals elicited by the bar endings of a barber-pole stimulus disambiguate 1-D motion signals with a variable strength which depends on depth (Shimojo et al, 1989 Vision Research29 619 – 626): these signals would be ‘abolished’ when they are extrinsic (ie the moving grating is behind the plane of the background containing the aperture), whereas they would be given full strength when they are intrinsic (ie the plane of the grating is in front of the background). These authors have suggested that the intrinsic/extrinsic classification is an early process. However, the very long duration (2300 ms) used in their study suggests other interpretations. Therefore, we tried to test whether the barber-pole illusion could be abolished with a shorter duration when the grating had an uncrossed disparity relative to the aperture plane, as initially described in the above-mentioned study (our 30 observers had to adjust an arrow to indicate the perceived direction of the grating). In accordance with our prediction, we could not replicate their finding with a duration of 400 ms. Surprisingly, increasing the duration up to 2300 ms was not sufficient to obtain a large bias towards 1-D signals. To understand this unexpected result, we tried to isolate the relevant difference between the initial study of Shimojo et al and our. We found that the main determinant of the suppression of the barber-pole illusion was the experimental procedure: when our observers had to assess the perceived direction of the barber-pole by choosing between horizontal and vertical, as in the initial study, the results did show a much larger bias towards 1-D signals. We suggest therefore that the extrinsic/intrinsic classification is a high-level process which can be influenced by the observer's expectations.
Collapse
|
19
|
Mann SK, Dufour A, Glass JJ, De Rose R, Kent SJ, Such GK, Johnston APR. Tuning the properties of pH responsive nanoparticles to control cellular interactions in vitro and ex vivo. Polym Chem 2016. [DOI: 10.1039/c6py01332e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Engineering the properties of nanoparticles to limit non-specific cellular interactions is critical for developing effective drug delivery systems. Differences between interactions with cultured cells and human blood highlights the need for appropriate assays.
Collapse
Affiliation(s)
- S. K. Mann
- Drug Delivery
- Disposition and Dynamics
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
| | - A. Dufour
- Drug Delivery
- Disposition and Dynamics
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
| | - J. J. Glass
- Department of Microbiology and Immunology
- The Peter Doherty Institute for Infection and Immunity
- The University of Melbourne
- Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
| | - R. De Rose
- Department of Microbiology and Immunology
- The Peter Doherty Institute for Infection and Immunity
- The University of Melbourne
- Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
| | - S. J. Kent
- Department of Microbiology and Immunology
- The Peter Doherty Institute for Infection and Immunity
- The University of Melbourne
- Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
| | - G. K. Such
- Department of Chemistry
- The University of Melbourne
- Parkville
- Australia
| | - A. P. R. Johnston
- Drug Delivery
- Disposition and Dynamics
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
| |
Collapse
|
20
|
Mallia-Milanes B, Dufour A, Bailey H, Meakin G, Leme A, Bolton C, Shapiro S, Overall C, Johnson S. S129 A two species proteomics approach to determine MMP-12 substrates in COPD. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
21
|
Tromp D, Dufour A, Lithfous S, Pebayle T, Després O. Episodic memory in normal aging and Alzheimer disease: Insights from imaging and behavioral studies. Ageing Res Rev 2015; 24:232-62. [PMID: 26318058 DOI: 10.1016/j.arr.2015.08.006] [Citation(s) in RCA: 193] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 08/20/2015] [Indexed: 12/30/2022]
Abstract
Age-related cognitive changes often include difficulties in retrieving memories, particularly those that rely on personal experiences within their temporal and spatial contexts (i.e., episodic memories). This decline may vary depending on the studied phase (i.e., encoding, storage or retrieval), according to inter-individual differences, and whether we are talking about normal or pathological (e.g., Alzheimer disease; AD) aging. Such cognitive changes are associated with different structural and functional alterations in the human neural network that underpins episodic memory. The prefrontal cortex is the first structure to be affected by age, followed by the medial temporal lobe (MTL), the parietal cortex and the cerebellum. In AD, however, the modifications occur mainly in the MTL (hippocampus and adjacent structures) before spreading to the neocortex. In this review, we will present results that attempt to characterize normal and pathological cognitive aging at multiple levels by integrating structural, behavioral, inter-individual and neuroimaging measures of episodic memory.
Collapse
Affiliation(s)
- D Tromp
- Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA - UMR 7364 - CNRS/UDS) - 21 rue Becquerel, 67087 Strasbourg, France.
| | - A Dufour
- Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA - UMR 7364 - CNRS/UDS) - 21 rue Becquerel, 67087 Strasbourg, France; Centre d'Investigations Neurocognitives et Neurophysiologiques (CI2N - UMS 3489 - CNRS/UDS) - 21 rue Becquerel, 67087 Strasbourg, France
| | - S Lithfous
- Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA - UMR 7364 - CNRS/UDS) - 21 rue Becquerel, 67087 Strasbourg, France
| | - T Pebayle
- Centre d'Investigations Neurocognitives et Neurophysiologiques (CI2N - UMS 3489 - CNRS/UDS) - 21 rue Becquerel, 67087 Strasbourg, France
| | - O Després
- Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA - UMR 7364 - CNRS/UDS) - 21 rue Becquerel, 67087 Strasbourg, France.
| |
Collapse
|
22
|
Palermo G, Maisel D, Barrett M, Smith H, Duchateau-Nguyen G, Nguyen T, Yeh RF, Dufour A, Robak T, Dornan D, Weisser M. Gene expression of INPP5F as an independent prognostic marker in fludarabine-based therapy of chronic lymphocytic leukemia. Blood Cancer J 2015; 5:e353. [PMID: 26430724 PMCID: PMC4635191 DOI: 10.1038/bcj.2015.82] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 07/24/2015] [Accepted: 08/10/2015] [Indexed: 01/30/2023] Open
Abstract
Chronic lymphocytic leukemia (CLL) is a heterogeneous disease. Various disease-related and patient-related factors have been shown to influence the course of the disease. The aim of this study was to identify novel biomarkers of significant clinical relevance. Pretreatment CD19-separated lymphocytes (n=237; discovery set) and peripheral blood mononuclear cells (n=92; validation set) from the REACH trial, a randomized phase III trial in relapsed CLL comparing rituximab plus fludarabine plus cyclophosphamide with fludarabine plus cyclophosphamide alone, underwent gene expression profiling. By using Cox regression survival analysis on the discovery set, we identified inositol polyphosphate-5-phosphatase F (INPP5F) as a prognostic factor for progression-free survival (P<0.001; hazard ratio (HR), 1.63; 95% confidence interval (CI), 1.35–1.98) and overall survival (P<0.001; HR, 1.47; 95% CI, 1.18–1.84), regardless of adjusting for known prognostic factors. These findings were confirmed on the validation set, suggesting that INPP5F may serve as a novel, easy-to-assess future prognostic biomarker for fludarabine-based therapy in CLL.
Collapse
Affiliation(s)
- G Palermo
- Roche Pharma Research and Early Development, Innovation Center, Basel, Switzerland
| | - D Maisel
- Roche Pharma Research and Early Development, Innovation Center, Penzberg, Germany
| | - M Barrett
- Hoffman-La Roche Pharmaceuticals Ltd, Welwyn, UK
| | - H Smith
- Hoffman-La Roche Ltd, Basel, Switzerland
| | - G Duchateau-Nguyen
- Roche Pharma Research and Early Development, Innovation Center, Basel, Switzerland
| | - T Nguyen
- Roche Pharma Research and Early Development, Innovation Center, Basel, Switzerland
| | - R-F Yeh
- Biostatistics, Genentech, Inc., South San Francisco, CA, USA
| | - A Dufour
- Laboratory for Leukemia Diagnostics, Klinikum Grosshadern, Ludwig Maximilians University, Munich, Germany
| | - T Robak
- Department of Haematology, Medical University, Lodz, Poland, South San Francisco, CA, USA
| | - D Dornan
- Research Oncology Diagnostics, Genentech, Inc., South San Francisco, CA, USA
| | - M Weisser
- Roche Pharma Research and Early Development, Innovation Center, Penzberg, Germany
| | | |
Collapse
|
23
|
Bertin M, Touvier M, Dubuisson C, Dufour A, Havard S, Lafay L, Volatier JL, Lioret S. Dietary patterns of French adults: associations with demographic, socio-economic and behavioural factors. J Hum Nutr Diet 2015; 29:241-54. [DOI: 10.1111/jhn.12315] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- M. Bertin
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
- INSERM U1085-IRSET; Team, Epidemiological Research on Environment; Reproduction and Development Team; Rennes 1 University; Rennes France
- EHESP; School of Public Health; Rennes France
| | - M. Touvier
- Sorbonne Paris Cité Research Center; Nutritional Epidemiology Unit; UMR U557; Inserm, U1125; Inra, CNAM; Paris 13 University SMBH; Paris France
| | - C. Dubuisson
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
| | - A. Dufour
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
| | - S. Havard
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
| | - L. Lafay
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
| | - J.-L. Volatier
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
| | - S. Lioret
- Food and Health Department; French Agency for Food, Environmental and Occupational Health Safety (ANSES); Maisons Alfort Cedex France
- Inserm UMR 1153; Early Origin of the Child's Health And Development Team (ORCHAD); Center for Epidemiology and Statistics Sorbonne Paris Cité; Paris Descartes University; France
| |
Collapse
|
24
|
Salmaggi A, Venegoni E, Eoli M, Lamperti E, Dufour A, Ciusani E, Milanese C, Nespolo A, Novi C. Immunological monitoring in systemic lupus erythematosus. Contrib Nephrol 2015; 99:114-7. [PMID: 1458915 DOI: 10.1159/000421699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- A Salmaggi
- Istituto Neurologico C. Besta, Milano, Magenta, Italia
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Zhou S, Kemp J, Després O, Pebayle T, Dufour A. The association between inhibition and pain tolerance in the elderly: Evidence from event-related potentials. Eur J Pain 2014; 19:669-76. [DOI: 10.1002/ejp.588] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/24/2014] [Indexed: 11/11/2022]
Affiliation(s)
- S. Zhou
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
| | - J. Kemp
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
| | - O. Després
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
| | - T. Pebayle
- Centre d'Investigations Neurocognitives et Neurophysiologiques; UMS 3489; CNRS; Université de Strasbourg; France
| | - A. Dufour
- Laboratoire de Neurociences Cogntitives et Adaptatives; UMR 7364; CNRS; Université de Strasbourg; France
- Centre d'Investigations Neurocognitives et Neurophysiologiques; UMS 3489; CNRS; Université de Strasbourg; France
| |
Collapse
|
26
|
Kemp J, Després O, Pebayle T, Dufour A. Age-related decrease in sensitivity to electrical stimulation is unrelated to skin conductance: An evoked potentials study. Clin Neurophysiol 2014; 125:602-7. [DOI: 10.1016/j.clinph.2013.08.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 07/11/2013] [Accepted: 08/15/2013] [Indexed: 10/26/2022]
|
27
|
Kemp J, Després O, Pebayle T, Dufour A. Differences in age-related effects on myelinated and unmyelinated peripheral fibres: A sensitivity and evoked potentials study. Eur J Pain 2013; 18:482-8. [DOI: 10.1002/j.1532-2149.2013.00388.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/22/2013] [Indexed: 11/08/2022]
Affiliation(s)
- J. Kemp
- Laboratoire de Neurosciences Cognitives et Adaptatives; UdS-CNRS; Strasbourg France
| | - O. Després
- Laboratoire de Neurosciences Cognitives et Adaptatives; UdS-CNRS; Strasbourg France
| | - T. Pebayle
- Centre d'Investigations Neurocognitives et Neurophysiologiques; UdS-CNRS; Strasbourg France
| | - A. Dufour
- Laboratoire de Neurosciences Cognitives et Adaptatives; UdS-CNRS; Strasbourg France
- Centre d'Investigations Neurocognitives et Neurophysiologiques; UdS-CNRS; Strasbourg France
| |
Collapse
|
28
|
Dubuisson C, Lioret S, Dufour A, Volatier JL, Lafay L, Turck D. Associations between usual school lunch attendance and eating habits and sedentary behaviour in French children and adolescents. Eur J Clin Nutr 2012; 66:1335-41. [DOI: 10.1038/ejcn.2012.137] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
29
|
Kuhn P, Zores C, Astruc D, Dufour A, Casper C. [Sensory system development and the physical environment of infants born very preterm]. Arch Pediatr 2011; 18 Suppl 2:S92-102. [PMID: 21763981 DOI: 10.1016/s0929-693x(11)71097-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The sensory systems develop in several sequences, with a process specific to each system and with a transnatal continuum. This development is based partly on interactions between the fetus and the newborn and their physical and human environments. These interactions are key drivers of the child development. The adaptation of the newborn's environment is crucial for his survival, his well-being and his development, especially if he is born prematurely. The physical environment of the hospital where immature infants are immersed differs greatly from the uterine environment from which they were extracted prematurely. There are discrepancies between their sensory expectations originating in the antenatal period and the atypical stimuli that newborns encounter in their postnatal nosocomial environment. These assertions are valid for all sensory modalities. Many studies have proven that very preterm infants are highly sensitive to this environment which can affect their physiological and behavioural well being. Moreover, it can alter their perception of important human sensory signals, particularly the ones coming from their mother. The long term impacts of this environment are more difficult to identify due to the multi-sensory nature of these stimuli and the multifactorial origin of the neurological disorders that these children may develop. However, the adaptation of their physical environment is one of the corner stones of specific developmental care programs, like the NIDCAP program that has been shown to be successful to improve their short and medium term outcomes. The architectural design, technical equipment and used health-care products, and the strategies and organizations of care are the main determinants of the physical environment of these children. Recommendations for the hospital environment, integrating a newborn's developmental perspective, have been made available. They should be applied more widely and should be completed. Technological equipment advances are also expected to allow better compliance to them. All these evolutions are completely in accordance with the concept of humane neonatal care.
Collapse
Affiliation(s)
- P Kuhn
- Service de Médecine et Réanimation Néonatale, Hôpital de Hautepierre, CHU Strasbourg, 28 Avenue Molière 67098 Strasbourg cedex, France.
| | | | | | | | | |
Collapse
|
30
|
Herold T, Jurinovic V, Metzeler KH, Boulesteix AL, Bergmann M, Seiler T, Mulaw M, Thoene S, Dufour A, Pasalic Z, Schmidberger M, Schmidt M, Schneider S, Kakadia PM, Feuring-Buske M, Braess J, Spiekermann K, Mansmann U, Hiddemann W, Buske C, Bohlander SK. An eight-gene expression signature for the prediction of survival and time to treatment in chronic lymphocytic leukemia. Leukemia 2011; 25:1639-45. [PMID: 21625232 DOI: 10.1038/leu.2011.125] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
31
|
Meneton P, Lafay L, Tard A, Dufour A, Ireland J, Ménard J, Volatier JL. Erratum: Dietary sources and correlates of sodium and potassium intakes in the French general population. Eur J Clin Nutr 2010. [DOI: 10.1038/ejcn.2009.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
32
|
Touzalin-Chretien P, Ehrler S, Dufour A. Dominance of Vision over Proprioception on Motor Programming: Evidence from ERP. Cereb Cortex 2009; 20:2007-16. [DOI: 10.1093/cercor/bhp271] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
33
|
Girods P, Dufour A, Fierro V, Rogaume Y, Rogaume C, Zoulalian A, Celzard A. Activated carbons prepared from wood particleboard wastes: characterisation and phenol adsorption capacities. J Hazard Mater 2009; 166:491-501. [PMID: 19128878 DOI: 10.1016/j.jhazmat.2008.11.047] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Revised: 11/16/2008] [Accepted: 11/17/2008] [Indexed: 05/27/2023]
Abstract
The problems of valorisation of particleboard wastes on one hand, and contamination of aqueous effluents by phenolic compounds on the other hand, are simultaneously considered in this work. Preparation of activated carbons from a two steps thermo-chemical process, formerly designed for generating combustible gases, is suggested. The resultant carbonaceous residue is activated with steam at 800 degrees C. Depending on the preparation conditions, surface areas within the range 800-1300 m(2)/g are obtained, close to that of a commercial activated carbon (CAC) specially designed for water treatment and used as a reference material. The present work shows that particleboard waste-derived activated carbons (WAC) are efficient adsorbents for the removal of phenol from aqueous solutions, with maximum measured capacities close to 500 mg/g. However, most of times, the adsorption capacities are slightly lower than that of the commercial material in the same conditions, i.e., at equilibrium phenol concentrations below 300 ppm. Given the extremely low cost of activated carbons prepared from particleboard waste, it should not be a problem to use it in somewhat higher amounts than what is required with a more expensive commercial material. Phenol adsorption isotherms at 298 K were correctly fitted by various equations modelling type I and type II isotherms for CAC and WAC, respectively. Phenol adsorption isotherms of type II were justified by a 3-stages adsorption mechanism.
Collapse
Affiliation(s)
- P Girods
- LERMAB, Nancy-Université, UMR INRA ENGREF 1093, ENSTIB 27, rue du Merle Blanc, BP 1041, 88051 Epinal cedex 9, France
| | | | | | | | | | | | | |
Collapse
|
34
|
Abstract
PURPOSE Investigate the involvement of auditory spatial compensation, which is observed in blind humans, in self-localization processes. METHOD Sighted and early-blind subjects had to indicate, on a two-dimensional view of the experimental room, the position where they previously sat and had passively listened to auditory spatial cues. Two different environments were distinguished. In a first session, auditory cues (i.e., white broadband sounds) were displayed successively in a dark anechoic room. This condition was defined as a simple acoustic environment. In a second session, four different auditory cues were displayed simultaneously at regular intervals in an experimental room, where echo cues were salient. This condition, which is more reminiscent of the natural situation, was described as a complex acoustic environment. RESULTS Self-localization capacities were significantly better in early-blind individuals than in sighted subjects, whatever the type of acoustic environment. CONCLUSIONS Auditory compensation leads to improved self-localization capacities in early-blind humans and indicates that prior visual experience is not essential for the development of spatial competence.
Collapse
Affiliation(s)
- O Després
- Centre d'étude de Physiologie Appliquée, Strasbourg cedex, France.
| | | | | | | |
Collapse
|
35
|
Sirot V, Volatier J, Calamassi-Tran G, Dubuisson C, Ménard C, Dufour A, Leblanc J. Core food of the French food supply: second Total Diet Study. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2009; 26:623-39. [DOI: 10.1080/02652030802695506] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
36
|
Lioret S, Touvier M, Dubuisson C, Dufour A, Calamassi-Tran G, Lafay L, Volatier JL, Maire B. Trends in child overweight rates and energy intake in France from 1999 to 2007: relationships with socioeconomic status. Obesity (Silver Spring) 2009; 17:1092-100. [PMID: 19148118 DOI: 10.1038/oby.2008.619] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Our objectives were (i) to assess the current prevalence of childhood overweight (including obesity) (OWOB) in France and its relationship with comprehensive socioeconomic status (SES) indicators and (ii) to examine trends in OWOB prevalence and changes in energy intake (EI) and sedentary behavior (SED) based on the previous INCA 1 (Individuelle Nationale des Consommations Alimentaires) data (1998-1999). A representative sample of children aged 3-14 (n = 1,030) was taken from the 2006-2007 cross-sectional INCA 2 food consumption survey. Weight and height were measured. The prevalence of OWOB was estimated according to the IOTF (International Obesity Task Force) definition. Average daily EI was evaluated using a 7-day food record. SED (screen time) and SES were reported by answering questionnaires. SES indicators included the occupation and level of education of the head of the household (HH), and variables describing household wealth. Composite indices of SES were computed by correspondence analysis, and relationships with OWOB were explored by logistic regression analysis. In total, 14.5% (95% CI: 12.1-17.0) of the children were OWOB. All SES indicators were inversely correlated to OWOB. Average EI was equal to 1,739 kcal/day. Daily, children spent 113.5 min watching television, and 38.5 min playing video games or using a computer. Compared to the INCA 1 study, OWOB prevalence was not significantly different, EI was lower, and SED was higher. These trends were the same across all occupational categories of heads of household. Although overall rates of childhood OWOB are currently stabilizing, no change was observed in the strong inverse socioeconomic gradient of OWOB between the two studies.
Collapse
Affiliation(s)
- Sandrine Lioret
- Dietary Survey Unit, Nutritional Epidemiology, French Food Safety Agency (Afssa), Maisons-Alfort Cedex, France.
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Girods P, Dufour A, Rogaume Y, Rogaume C, Zoulalian A. Thermal removal of nitrogen species from wood waste containing urea formaldehyde and melamine formaldehyde resins. J Hazard Mater 2008; 159:210-221. [PMID: 18359558 DOI: 10.1016/j.jhazmat.2008.02.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Revised: 01/11/2008] [Accepted: 02/05/2008] [Indexed: 05/26/2023]
Abstract
The removal of nitrogen from wood board waste through a low temperature pyrolysis (523-573 K) is investigated with two analytical methods. The kinetic study of the thermal behaviour of wood board and of its components (wood, UF and MF resins) shows the feasibility of removing thermally nitrogen from wood board waste. Indeed, the range of temperatures associated with the degradation of wood is different from the one obtained for the degradation of UF and MF resin. Isothermal conditions enable the determination of a kinetic model for degradation of wood board and of its components and demonstrate that the thermal behaviour of wood board is not the reflection of the sum of its components' behaviour. FTIR analysis of gas products confirms the feasibility removing nitrogen thermally and enables the evaluation of the optimum treatment conditions (temperature/duration). Elementary analysis of the treated samples and study of their low heating value (LHV) enable to quantify the efficiency of the thermal treatment in terms of nitrogen removal and of energy recovery. Results show that around 70% of the initial nitrogen can be removed from the waste, and that the temperature of treatment (between 523 K and 573 K) does not influence the efficiency in terms of nitrogen removal. Nevertheless, the ratio Residual energy/Initial energy (between 76% and 90%) is improved with the lowest temperature of treatment.
Collapse
Affiliation(s)
- P Girods
- LERMAB, Nancy-Université, UMR 1093, INRA, ENGREF, UHP, ENSTIB 27, rue du Merle Blanc, BP 1041, 88 051 Epinal, France.
| | | | | | | | | |
Collapse
|
38
|
Le Brun I, Dufour A, Crest M, Szabó G, Erdelyi F, Baude A. Differential expression of Nk1 and NK3 neurokinin receptors in neurons of the nucleus tractus solitarius and the dorsal vagal motor nucleus of the rat and mouse. Neuroscience 2008; 152:56-64. [PMID: 18222044 DOI: 10.1016/j.neuroscience.2007.12.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 12/07/2007] [Accepted: 12/11/2007] [Indexed: 12/16/2022]
Abstract
Tachykinins (substance P, neurokinin A and neurokinin B) influence autonomic functions by modulating neuron activity in nucleus tractus solitarius (NTS) and dorsal motor nucleus of the vagus (DMV) through activation of neurokinin receptors NK1 and NK3. Our purpose was to identify and define by neurochemical markers, the subpopulations of NK1 and NK3 expressing neurons in NTS and DMV of rat and mouse. Because the distribution of the NK1 and NK3 expressing neurons overlaps, co-expression for both receptors was tested. By double labeling, we show that NK1 and NK3 were not co-expressed in NTS neurons. In the DMV, most of neurons (87%) were immunoreactive for only one of the receptors and 34% of NK1 neurons, 7% of NK3 neurons and 12% of NK1-NK3 neurons were cholinergic neurons. None of the neurons immunoreactive for NK1 or NK3 were positive for tyrosine hydroxylase, suggesting that catecholaminergic cells of the NTS (A2 and C2 groups) did not express neurokinin receptors. The presence of NK1 and NK3 was examined in GABAergic interneurons of the NTS and DMV by using GAD65-EGFP transgenic mouse. Immunoreactivity for NK1 or NK3 was found in a subpopulation of GAD65-EGFP cells. A majority (60%) of NK3 cells, but only 11% of the NK1 cells, were GAD65-EGFP cells. In conclusion, tachykinins, through differential expression of neurokinin receptors, may influence the central regulation of vital functions by acting on separate neuron subpopulations in NTS and DMV. Of particular interest, tachykinins may be involved in inhibitory mechanisms by acting directly on local GABAergic interneurons. Our results support a larger contribution of NK3 compared with NK1 in mediating inhibition in NTS and DMV.
Collapse
Affiliation(s)
- I Le Brun
- Laboratoire de Neurophysiologie Cellulaire, Université de la Méditerranée, CNRS UMR 6150, IFR Jean-Roche, Faculté de Médecine Nord, Boulevard Pierre Dramard, 13916 Marseille 20, France
| | | | | | | | | | | |
Collapse
|
39
|
Dufour A, Girods P, Masson E, Normand S, Rogaume Y, Zoulalian A. Comparison of two methods of measuring wood pyrolysis tar. J Chromatogr A 2007; 1164:240-7. [PMID: 17628580 DOI: 10.1016/j.chroma.2007.06.049] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2007] [Revised: 06/14/2007] [Accepted: 06/22/2007] [Indexed: 11/25/2022]
Abstract
Two methods for the sampling and analysis of tar produced from wood pyrolysis were compared. The first method used a conventional cold-trapping technique in solvent-filled impingers followed by liquid injection. The second one is a new application of multibed solid-phase adsorbent (SPA) tubes followed by thermal desorption (TD). Both methods are based on gas chromatography (GC) coupled with mass spectrometry (MS). Quantification was performed with a well reproducible GC-MS method with three internal deuterated standards. The SPA/TD method offers several advantages. No solvent is required, the detection levels are improved, and gas chromatography separation is easier. Moreover, sampling time is reduced from about 1h (for the conventional cold-trapping technique in impingers) to a few seconds. No discrimination was observed between the two sampling methods for the 10 quantified compounds (aromatic compounds from benzene to phenanthrene and phenols) except for benzene.
Collapse
Affiliation(s)
- A Dufour
- Gaz de France, Research & Development Division, 361 avenue du Président Wilson, 93 211, Saint Denis la Plaine Cedex, France.
| | | | | | | | | | | |
Collapse
|
40
|
Mallick S, Taksin L, Le Toquin S, Dufour A, Fouques Y, Bensadoun H. POD-01.12: High intensity focused ultrasound therapy for clinically localized prostate cancer: efficacy and morbidity of the minimally invasive procedure. Urology 2007. [DOI: 10.1016/j.urology.2007.06.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
41
|
Schneider F, Bohlander SK, Schneider S, Papadaki C, Kakadyia P, Dufour A, Vempati S, Unterhalt M, Feuring-Buske M, Buske C, Braess J, Wandt H, Hiddemann W, Spiekermann K. AML1-ETO meets JAK2: clinical evidence for the two hit model of leukemogenesis from a myeloproliferative syndrome progressing to acute myeloid leukemia. Leukemia 2007; 21:2199-201. [PMID: 17625612 DOI: 10.1038/sj.leu.2404830] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
42
|
Drobinski P, Saïd F, Ancellet G, Arteta J, Augustin P, Bastin S, Brut A, Caccia JL, Campistron B, Cautenet S, Colette A, Coll I, Corsmeier U, Cros B, Dabas A, Delbarre H, Dufour A, Durand P, Guénard V, Hasel M, Kalthoff N, Kottmeier C, Lasry F, Lemonsu A, Lohou F, Masson V, Menut L, Moppert C, Peuch VH, Puygrenier V, Reitebuch O, Vautard R. Regional transport and dilution during high‐pollution episodes in southern France: Summary of findings from the Field Experiment to Constraint Models of Atmospheric Pollution and Emissions Transport (ESCOMPTE). ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007494] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- P. Drobinski
- Institut Pierre‐Simon Laplace, Service d'Aéronomie Université Pierre et Marie Curie Paris France
| | - F. Saïd
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - G. Ancellet
- Institut Pierre‐Simon Laplace, Service d'Aéronomie Université Pierre et Marie Curie Paris France
| | - J. Arteta
- Laboratoire de Météorologie Physique Université Blaise Pascal Aubière France
| | - P. Augustin
- Laboratoire de Physico‐Chimie de l'Atmosphère Université du Littoral‐Côte d'Opale Dunkerque France
| | - S. Bastin
- Institut Pierre‐Simon Laplace, Service d'Aéronomie Université Pierre et Marie Curie Paris France
| | - A. Brut
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - J. L. Caccia
- Laboratoire de Sondages Electromagnétiques de l'Environnement Terrestre Université du Sud Toulon‐Var Toulon France
| | - B. Campistron
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - S. Cautenet
- Laboratoire de Météorologie Physique Université Blaise Pascal Aubière France
| | - A. Colette
- Institut Pierre‐Simon Laplace, Service d'Aéronomie Université Pierre et Marie Curie Paris France
| | - I. Coll
- Faculté des Sciences et Technologie Laboratoire Inter‐Universitaire des Systèmes Atmosphériques Créteil France
| | - U. Corsmeier
- Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe Universität Karlsruhe Karlsruhe Germany
| | - B. Cros
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - A. Dabas
- Centre National de Recherches Météorologiques Météo‐France Toulouse France
| | - H. Delbarre
- Laboratoire de Physico‐Chimie de l'Atmosphère Université du Littoral‐Côte d'Opale Dunkerque France
| | - A. Dufour
- Centre National de Recherches Météorologiques Météo‐France Toulouse France
| | - P. Durand
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - V. Guénard
- Laboratoire de Sondages Electromagnétiques de l'Environnement Terrestre Université du Sud Toulon‐Var Toulon France
| | - M. Hasel
- Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe Universität Karlsruhe Karlsruhe Germany
| | - N. Kalthoff
- Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe Universität Karlsruhe Karlsruhe Germany
| | - C. Kottmeier
- Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe Universität Karlsruhe Karlsruhe Germany
| | - F. Lasry
- Faculté des Sciences et Technologie Laboratoire Inter‐Universitaire des Systèmes Atmosphériques Créteil France
| | - A. Lemonsu
- Centre National de Recherches Météorologiques Météo‐France Toulouse France
| | - F. Lohou
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - V. Masson
- Centre National de Recherches Météorologiques Météo‐France Toulouse France
| | - L. Menut
- Laboratoire de Météorologie Dynamique Institut Pierre‐Simon Laplace, École Polytechnique Palaiseau France
| | - C. Moppert
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - V. H. Peuch
- Centre National de Recherches Météorologiques Météo‐France Toulouse France
| | - V. Puygrenier
- Laboratoire d'Aérologie Université Paul Sabatier Toulouse France
| | - O. Reitebuch
- Institut für Physik der Atmosphäre Deutsches Zentrum für Luft‐ und Raumfahrt Oberpfaffenhofen Germany
| | - R. Vautard
- Laboratoire des Sciences du Climat et de l'Environnement Institut Pierre Simon Laplace, Commisariat à l'Énergie Atomique Gif‐sur‐Yvette France
| |
Collapse
|
43
|
|
44
|
Dufour A, Touzalin P, Candas V. Rightward shift of the auditory subjective straight ahead in right- and left-handed subjects. Neuropsychologia 2007; 45:447-53. [PMID: 16879840 DOI: 10.1016/j.neuropsychologia.2006.05.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2006] [Revised: 05/22/2006] [Accepted: 05/31/2006] [Indexed: 10/24/2022]
Abstract
While spatial asymmetries have been extensively investigated in the visual modality and to a lesser degree in the tactile modality, there are no reports on auditory spatial asymmetries in neurologically normal subjects. The subjects in this study performed an auditory midline task in which they had to adjust the level of two sounds that were presented simultaneously in different hemispaces so as to make the perceived fused sound appear to emanate from the midsagittal plane. The results showed that subjects reported a sound to be central when it was lateralized to the left (i.e., more intense at the left ear), as if there were a rightward shift in the perceived location. This rightward shift was more pronounced in left-handed than in right-handed subjects, even though all the subjects had to use both hands to adjust the sound level. Gaze direction significantly modulated the shift of the perceived auditory midline: the rightward shift was maximal when the subjects' gaze direction was central and 30 degrees to the right, while it disappeared when the gaze was directed 30 degrees to the left side. These results are compared with data obtained from neglect patients in previous studies and are discussed in terms of the interaction between asymmetrical hemispheric activations in auditory spatial tasks and an asymmetrical allocation of attention between the left and right hemispaces.
Collapse
Affiliation(s)
- A Dufour
- Centre d'Etudes de Physiologie Appliquée, UPS 858 CNRS, 21 rue Becquerel, 67087 Strasbourg, France.
| | | | | |
Collapse
|
45
|
Mallick S, Dufour A, Fouques Y, Bensadoun H. SALVAGE THERAPY USING HIGH-INTENSITY FOCUSED ULTRASOUND FOR LOCAL RECURRENCE OF PROSTATE CANCER AFTER RADIATION THERAPY. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/s1569-9056(06)60446-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
46
|
Després O, Candas V, Dufour A. Auditory compensation in myopic humans: involvement of binaural, monaural, or echo cues? Brain Res 2005; 1041:56-65. [PMID: 15804500 DOI: 10.1016/j.brainres.2005.01.101] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2004] [Revised: 01/27/2005] [Accepted: 01/31/2005] [Indexed: 10/25/2022]
Abstract
The purpose of this paper is to investigate the involvement of various auditory localization mechanisms in the improvement of auditory spatial sensitivity in the case of partial visual deprivation. We compared sensitivity to binaural, monaural, and echo cues between normal-sighted and myopic subjects. In an auditory task, which depended solely upon binaural processing, myopic and normal-sighted subjects showed an almost equal localization performance. We also found that myopic subjects were no more disturbed than normal-sighted subjects when spectral shape cues were removed. On the other hand, near-sighted subjects exhibited better echolocation skills and a higher sensitivity to echo cues than normal-sighted subjects. We can therefore conclude that an improved auditory spatial sensitivity in myopic subjects may result from the increased use of echo information.
Collapse
Affiliation(s)
- O Després
- Centre d'Etudes de Physiologie Appliquée 21, rue Becquerel, 67087 Strasbourg Cedex, France.
| | | | | |
Collapse
|
47
|
Abstract
Our aim was to compare memory and frontal function performance between two groups of patients treated with Guglielmi detachable coil (GDC) following intracranial ruptured aneurysm. The subgroups drawn following the localization of the aneurysm consisted of 19 patients presenting with anterior communicating artery aneurysms and 16 patients exhibiting middle cerebral artery and posterior communicating artery aneurysms. The 35 patients and 35 normal controls were administered extensive neuropsychological assessment. Additionally, a scale of qualitative changes of mood was presented to the patients and patients' relatives. The patients showed a better general performance on memory compared with the executive function performance, which was similarly impaired in both groups. We suggest that executive functions are more vulnerable to differently located lesions than memory functions.
Collapse
Affiliation(s)
- L Manning
- Laboratoire de Neurosciences Comportementales et Cognitives UMR 7521 IFR 37 and ULP, Strasbourg, France.
| | | | | |
Collapse
|
48
|
Adler M, De Vos M, Dufour A, Janssens J, Laurent S, Melange M, Polus M, Op de Beeck B, Schapira M, Van Cutsem E, Van Gossum A. Report on the Belgian consensus meeting on colorectal cancer screening. Acta Gastroenterol Belg 2005; 68:239-40. [PMID: 16013641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Screening and prevention of colorectal cancer must be a public health priority. It is the most frequent malignancy in Europe, the second leading cause of cancer death, including Belgium where more than 6000 new cases occur per year. Various screening modalities, from non invasive to invasive are available and currently in use and they are all cost-effective in comparison with no screening. The decision as to which screening test to use should be made by the patient and clinician. Consensus documents prepared by the Belgian scientific community appear in this issue of Acta Gastroenterologica Belgica, summarizing the scientific evidence in favour as well as the limitations of fecal occult blood tests, flexible sigmoidoscopy, videocolonoscopy and virtual colonoscopy.
Collapse
Affiliation(s)
- M Adler
- Department of Gastroenterology, Erasmus Hospital, ULB, Brussels
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Després O, Candas V, Dufour A. Spatial auditory compensation in early-blind humans: Involvement of eye movements and/or attention orienting? Neuropsychologia 2005; 43:1955-62. [PMID: 16168735 DOI: 10.1016/j.neuropsychologia.2005.03.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2004] [Revised: 02/17/2005] [Accepted: 03/02/2005] [Indexed: 10/25/2022]
Abstract
Several studies have reported that the early-blind displays higher auditory spatial abilities than the sighted. Although many studies have attempted to delineate the cortical structures that undergo functional reorganization in blind people, few have tried to determine which auditory or non-auditory processes mediate these increased auditory spatial abilities. The aim of this paper is to investigate the role of eye movements and orientation of attention in auditory localization in blind humans. Although we found, in a first experiment, that the influence of eye movements on auditory spatial localization is preserved in spite of congenital visual deprivation, the saccade influence on spatial hearing is not more pronounced in the blind than in the sighted. In a second experiment, early-blind and sighted subjects undertook a task involving discrimination of sound elevation in which auditory targets followed uninformative auditory cues on either side with an intermediate elevation. When sounds were emitted from the frontal hemifield, both groups showed similar auditory localization performance. Although the auditory cue did not affect discrimination accuracy in both groups, early-blind subjects exhibited shorter reaction times than sighted subjects when sound sources were placed at far-lateral locations. Attentional cues, however, had similar effects on both groups of subjects, suggesting that improved auditory spatial abilities are not mediated by attention orienting mechanisms.
Collapse
Affiliation(s)
- O Després
- Centre d'Etudes de Physiologie Appliquée 21, rue Becquerel, 67087 Strasbourg Cedex, France.
| | | | | |
Collapse
|
50
|
Hoffmann K, Boeing H, Dufour A, Volatier JL, Telman J, Virtanen M, Becker W, De Henauw S. Estimating the distribution of usual dietary intake by short-term measurements. Eur J Clin Nutr 2002; 56 Suppl 2:S53-62. [PMID: 12082518 DOI: 10.1038/sj.ejcn.1601429] [Citation(s) in RCA: 164] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To estimate the habitual dietary intake distribution in a population on the basis of repeated short-term measurements, especially of multiple 24 h diet recalls. METHODS Six different statistical methods were evaluated and compared. The comparison referred to theoretical assumptions, admitted data transformations, statistical foundations, available software packages, and applications to real data of dietary intake. RESULTS The Nusser method and a simplified version of it proposed in the paper have proved to be universally applicable methods for estimating the usual intake distribution for food groups and nutrients. Also, the Buck method seemed to be a robust estimation procedure suitable for the description of food consumption data, whereas the other considered methods were only applicable for log-normally distributed intake data or required a comprehensive data simulation. Characteristics of the estimated usual intake distribution were a decreased standard deviation, increased lower percentiles, and decreased upper percentiles compared to the observed sample distribution of individual means. Empirical results concerning total fat and vegetable intake in three different European consumption surveys showed that the estimated percentiles of the usual intake distribution did not depend markedly on the number of sampling days. CONCLUSIONS Repeated short-term measurements like 24 h diet recalls can be used to describe the habitual dietary intake distribution in food consumption surveys. Recommended is a sampling design of two non-consecutive sampling days. The sampling days of all participants should be selected in such a way that they cover all seasons and days of the week.
Collapse
Affiliation(s)
- K Hoffmann
- German Institute of Human Nutrition, Potsdam-Rehbrücke, Germany.
| | | | | | | | | | | | | | | |
Collapse
|