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Mazari-Arrighi E, Ayollo D, Farhat W, Marret A, Gontran E, Dupuis-Williams P, Larghero J, Chatelain F, Fuchs A. Construction of functional biliary epithelial branched networks with predefined geometry using digital light stereolithography. Biomaterials 2021; 279:121207. [PMID: 34741977 DOI: 10.1016/j.biomaterials.2021.121207] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 04/12/2021] [Revised: 10/11/2021] [Accepted: 10/20/2021] [Indexed: 12/24/2022]
Abstract
Cholangiocytes, biliary epithelial cells, are known to spontaneously self-organize into spherical cysts with a central lumen. In this work, we explore a promising biocompatible stereolithographic approach to encapsulate cholangiocytes into geometrically controlled 3D hydrogel structures to guide them towards the formation of branched tubular networks. We demonstrate that within the appropriate mix of hydrogels, normal rat cholangiocytes can proliferate, migrate, and organize into branched tubular structures with walls consisting of a cell monolayer, transport fluorescent dyes into the luminal space, and show markers of epithelial maturation such as primary cilia and continuous tight junctions. The resulting structures have dimensions typically found in the intralobular and intrahepatic biliary tree and are stable for weeks, without any requirement of bulk supporting material, thereby offering total access to the external side of these biliary epithelial constructs.
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Affiliation(s)
- Elsa Mazari-Arrighi
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France; CEA, IRIG, F-38000, Grenoble, France
| | - Dmitry Ayollo
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France; CEA, IRIG, F-38000, Grenoble, France
| | - Wissam Farhat
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France; CEA, IRIG, F-38000, Grenoble, France
| | - Auriane Marret
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France; CEA, IRIG, F-38000, Grenoble, France
| | - Emilie Gontran
- INSERM U-1279, Gustave Roussy, Villejuif, F-94805, France; Université Paris-Saclay, Inserm, Physiopathogenèse et traitement des maladies du foie, F-94800, Villejuif, France
| | - Pascale Dupuis-Williams
- Université Paris-Saclay, Inserm, Physiopathogenèse et traitement des maladies du foie, F-94800, Villejuif, France; ESPCI Paris, Université PSL, F-75005, Paris, France
| | - Jerome Larghero
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France
| | - Francois Chatelain
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France; CEA, IRIG, F-38000, Grenoble, France
| | - Alexandra Fuchs
- Université de Paris, Inserm, U976 HIPI, F-75006, Paris, France; AP-HP, Hôpital Saint-Louis, 1 avenue Vellefaux, F-75010, Paris, France; CEA, IRIG, F-38000, Grenoble, France.
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2
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Ribeiro de Oliveira Mendes B, Feliciangeli S, Menard M, Chatelain F, Montnach J, Nicolas S, Ollivier B, Baro I, Schott J, Probst V, Kyndt F, Denjoy I, Lesage F, Loussouarn G, De Waard M. Fast Track hERG phenotyping to evaluate the pathogenicity of KCNH2 genetic variants. Archives of Cardiovascular Diseases Supplements 2021. [DOI: 10.1016/j.acvdsp.2021.04.157] [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]
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3
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Laurent J, Blin G, Chatelain F, Vanneaux V, Fuchs A, Larghero J, Théry M. Convergence of microengineering and cellular self-organization towards functional tissue manufacturing. Nat Biomed Eng 2017; 1:939-956. [DOI: 10.1038/s41551-017-0166-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 11/07/2017] [Indexed: 12/18/2022]
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4
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Abstract
This paper studies a family of distributions constructed from multivariate gamma distributions to model the statistical properties of multisensor synthetic aperture radar (SAR) images. These distributions referred to as multisensor multivariate gamma distributions (MuMGDs) are potentially interesting for detecting changes in SAR images acquired by different sensors having different numbers of looks. The first part of this paper compares different estimators for the parameters of MuMGDs. These estimators are based on the maximum likelihood principle, the method of inference function for margins, and the method of moments. The second part of the paper studies change detection algorithms based on the estimated correlation coefficient of MuMGDs. Simulation results conducted on synthetic and real data illustrate the performance of these change detectors.
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Affiliation(s)
- F Chatelain
- IRIT/ENSEEIHT/TéSA, 31071 Toulouse cedex 7, France.
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5
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Fouqué B, Brachet AG, Gétin S, Pégon P, Obeïd P, Delapierre G, Chatelain F. Improvement of yeast biochip sensitivity using multilayer inorganic sol–gel substrates. Biosens Bioelectron 2007; 22:2151-7. [PMID: 17085034 DOI: 10.1016/j.bios.2006.09.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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: 04/21/2006] [Revised: 09/07/2006] [Accepted: 09/29/2006] [Indexed: 11/30/2022]
Abstract
Today, microarray fluorescence detection is still limited because a great proportion of hybrids remain undetectable. In this paper we describe sol-gel optical multilayers (stacks of low- and high-index layers) deposited on glass slides which increase the fluorescence of DNA microarrays and favour the detection of fluorescent targets. An alternative to the expensive and time-consuming physical vapour deposition technology is proposed. It is a low-cost sol-gel coating of glass slides, each layer being made by "dipping" (alternatively in SiO2 or TiO2 solutions), "draining and drying". After the selection of the best surface layer of the substrates, the multilayer mirrors modelled for one (Cy3) or two (Cy3 and Cy5) fluorophores are spotted with a series of Yeast probes and compared to similar microarrays on standard glass slides through hybridisation experiments. The fluorescence images of the mirrors show increased signals for all the probes. The enhancement factors determined for Cy3 and for Cy3/Cy5 mirrors (10-12 and 4-5, respectively) are consistent with the initial modelling. This allows the assessment of the basal expression levels of Yeast low-expressed genes. Moreover, these substrates show a noticeable increase in sensitivity for induction/repression ratio measurements in differential gene expression experiments. So, they could be considered as promising tools for the analysis of small biological samples.
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Affiliation(s)
- B Fouqué
- CEA, DSV/DRDC/Biopuces, Grenoble F-38054, France.
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6
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Simon A, Girard-Egrot A, Sauter F, Pudda C, Picollet D'Hahan N, Blum L, Chatelain F, Fuchs A. Formation and stability of a suspended biomimetic lipid bilayer on silicon submicrometer-sized pores. J Colloid Interface Sci 2007; 308:337-43. [PMID: 17275017 DOI: 10.1016/j.jcis.2006.11.050] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [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: 09/27/2006] [Revised: 11/28/2006] [Accepted: 11/29/2006] [Indexed: 11/18/2022]
Abstract
We report the fabrication of a thin silicon membrane with an array of micrometer and submicrometer pores that acts as a scaffold for suspending a lipid bilayer. We successfully deposited a lipid bilayer by the Langmuir-Blodgett method on a synthetic silicon membrane bearing arrays of pores with sizes of 1000, 650, and 300 nm. Topographic images obtained by AFM showed a suspended lipid film spanning the pores, whatever the pore size. Higher stability of bilayers supported on smaller pores was shown by AFM characterization. These results represent an important first step to creating a biomimetic environment to study cell membrane dynamics and/or in developing a biosensor.
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Affiliation(s)
- A Simon
- CEA, DSV/DRDC/Biopuces, 38 054 Grenoble cedex 9, France.
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7
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Sordel T, Kermarec-Marcel F, Garnier-Raveaud S, Glade N, Sauter-Starace F, Pudda C, Borella M, Plissonnier M, Chatelain F, Bruckert F, Picollet-D'hahan N. Influence of glass and polymer coatings on CHO cell morphology and adhesion. Biomaterials 2007; 28:1572-84. [PMID: 17140656 DOI: 10.1016/j.biomaterials.2006.10.032] [Citation(s) in RCA: 14] [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: 07/07/2006] [Accepted: 10/30/2006] [Indexed: 10/23/2022]
Abstract
Successful development of cell-on-chip microsystems where living cells are deposited and grown in microfabricated structures is highly dependent on the control of cell/substrate interactions. In this study, several materials of interest were tested for CHO cell growth and morphology: (i) glass, fibronectin-, poly-L-lysine- and 3-aminopropyltriethoxysilane (APTES)--treated glass and UV/O(3)-modified PDMS coating on glass as well as (ii) silicon, poly-L-lysine-, APTES-, O(2) plasma-treated and oxide-coated silicon. In addition, we quantitatively characterized cell adhesion to these substrates using a radial flow detachment assay. Lack of correlation between cell adhesion and cell morphology was systematically observed for all substrates. In particular, we show that PDMS coatings on glass can be finely tuned by UV/O(3) treatment to enhance cell adhesion and induce elongated morphology. Moreover, we observed a low shear stress cell detachment mechanism on silicon oxide coatings on silicon wafers. It is therefore possible with these coatings to selectively influence either cell adhesion or morphology.
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Affiliation(s)
- Thomas Sordel
- BioChip Laboratory-CEA, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
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8
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Hägi M, Crouzet J, Chatelain F, Haffen E, Woronoff A, Monnet E. P13-6 - Variations des comportements suicidaires selon le sexe, l’âge et le lieu de résidence : une étude régionale. Rev Epidemiol Sante Publique 2006. [DOI: 10.1016/s0398-7620(06)76964-4] [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: 11/28/2022] Open
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9
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Fuchs AB, Romani A, Freida D, Medoro G, Abonnenc M, Altomare L, Chartier I, Guergour D, Villiers C, Marche PN, Tartagni M, Guerrieri R, Chatelain F, Manaresi N. Electronic sorting and recovery of single live cells from microlitre sized samples. Lab Chip 2006; 6:121-6. [PMID: 16372078 DOI: 10.1039/b505884h] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Sorting and recovering specific live cells from samples containing less than a few thousand cells have become major hurdles in rare cell exploration such as stem cell research, cell therapy and cell based diagnostics. We describe here a new technology based on a microelectronic chip integrating an array of over 100,000 independent electrodes and sensors which allow individual and parallel single cell manipulation of up to 10,000 cells while maintaining viability and proliferation capabilities. Manipulation is carried out using dynamic dielectrophoretic traps controlled by an electronic interface. We also demonstrate the capabilities of the chip by sorting and recovering individual live fluorescent cells from an unlabeled population.
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Affiliation(s)
- Alexandra B Fuchs
- BioChip Lab/Laboratoire Biopuces - CEA, 17 rue des Martyrs, 38054, Grenoble cedex 9, France.
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10
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Gaugiran S, Gétin S, Fedeli J, Colas G, Fuchs A, Chatelain F, Dérouard J. Optical manipulation of microparticles and cells on silicon nitride waveguides. Opt Express 2005; 13:6956-63. [PMID: 19498716 DOI: 10.1364/opex.13.006956] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We demonstrate the optical manipulation of cells and dielectric particles on the surface of silicon nitride waveguides. Glass particles with 2microm diameter are propelled at velocities of 15microm/s with a guided power of 20mW. This is approximately 20 times more efficient than previously reported, and permits to use this device on low refractive index objects such as cells. Red blood cells and yeast cells can be trapped on the waveguide and pushed along it by the action of optical forces. This kind of system can easily be combined with various integrated optical structures and opens the way to the development of new microsystems for cell sorting applications.
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11
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Fouqué B, Schaack B, Obeïd P, Combe S, Gétin S, Barritault P, Chaton P, Chatelain F. Multiple wavelength fluorescence enhancement on glass substrates for biochip and cell analyses. Biosens Bioelectron 2005; 20:2335-40. [PMID: 15797336 DOI: 10.1016/j.bios.2004.08.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [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: 05/18/2004] [Revised: 07/27/2004] [Accepted: 08/04/2004] [Indexed: 10/26/2022]
Abstract
In microarrays experiments, a serious limitation is the unreliability of low signal intensities data and the lack of reproducibility for the resulting ratios between samples and controls. Most of the light emitted by a fluorophore at the air/glass interface of a glass slide is absorbed by the glass so just a part of the emitted fluorescence is detected. To improve the sensitivity of the fluorescence detection of both common fluorophores Cy3 and Cy5 in DNA microarrays and fluorescent cell analyses, we have designed a multi layer mirror with alternative thin layers of SiO2 and HfO2. This mirror (MOTL) prevents fluorescence absorption, allows the simultaneous enhancement of the fluorescence signals and increases the dynamic range of the slides. Using MOTL slides, Cy3 and Cy5 intensities are enhanced by 5-8-fold, consequently, the fluorescence analysis becomes easier and should allow the detection of low copy number genes or weakly fluorescent cells. With the same approach, other multiple optical thin layer slides could be designed for other series of fluorophores, extending the field of their applications.
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Affiliation(s)
- B Fouqué
- CEA/Direction des Sciences du Vivant DRDC/Biopuces, 17 rue de Martyrs, 38054 Grenoble Cedex 9, France.
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12
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Butler JH, Cronin M, Anderson KM, Biddison GM, Chatelain F, Cummer M, Davi DJ, Fisher L, Frauendorf AW, Frueh FW, Gjerstad C, Harper TF, Kernahan SD, Long DQ, Pho M, Walker JA, Brennan TM. In situ synthesis of oligonucleotide arrays by using surface tension. J Am Chem Soc 2001; 123:8887-94. [PMID: 11552795 DOI: 10.1021/ja003758r] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This work describes the in situ synthesis of oligonucleotide arrays on glass surfaces. These arrays are composed of features defined and separated by differential surface tension (surface tension arrays). Specifically, photolithographic methods were used to create a series of spatially addressable, circular features containing an amino-terminated organosilane coupled to the glass through a siloxane linkage. Each feature is bounded by a perfluorosilanated surface. The differences in surface energies between the features and surrounding zones allow for chemical reactions to be readily localized within a defined site. The aminosilanation process was analyzed using contact angle, X-ray photoelectron spectroscopy (XPS), and time-of-flight/secondary ion mass spectroscopy (TOF-SIMS). The efficiency of phosphoramidite-based oligonucleotide synthesis on these surface tension arrays was measured by two methods. One method, termed step-yields-by-hybridization, indicates an average synthesis efficiency for all four (A,G,C,T) bases of 99.9 +/- 1.1%. Step yields measured for the individual amidite bases showed efficiencies of 98.8% (dT), 98.0% (dA), 97.0% (dC), and 97.6% (dG). The second method for determining the amidite coupling efficiencies was by capillary electrophoresis (CE) analysis. Homopolymers of dT (40- and 60mer), dA (40mer), and dC (40mer) were synthesized on an NH(4)OH labile linkage. After cleavage, the products were analyzed by CE. Synthesis efficiencies were calculated by comparison of the full-length product peak with the failure peaks. The calculated coupling efficiencies were 98.8% (dT), 96.8% (dA), and 96.7% (dC).
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Affiliation(s)
- J H Butler
- GenePharm Inc., 136 South Wolfe Road, Sunnyvale, CA 94086, USA.
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13
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Louet JF, Chatelain F, Decaux JF, Park EA, Kohl C, Pineau T, Girard J, Pegorier JP. Long-chain fatty acids regulate liver carnitine palmitoyltransferase I gene (L-CPT I) expression through a peroxisome-proliferator-activated receptor alpha (PPARalpha)-independent pathway. Biochem J 2001; 354:189-97. [PMID: 11171094 PMCID: PMC1221643 DOI: 10.1042/0264-6021:3540189] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Liver carnitine palmitoyltransferase I (L-CPT I) catalyses the transfer of long-chain fatty acid (LCFA) for translocation across the mitochondrial membrane. Expression of the L-CPT I gene is induced by LCFAs as well as by lipid-lowering compounds such as clofibrate. Previous studies have suggested that the peroxisome-proliferator-activated receptor alpha (PPARalpha) is a common mediator of the transcriptional effects of LCFA and clofibrate. We found that free LCFAs rather than acyl-CoA esters are the signal metabolites responsible for the stimulation of L-CPT I gene expression. Using primary culture of hepatocytes we found that LCFAs failed to stimulate L-CPT I gene expression both in wild-type and PPARalpha-null mice. These results suggest that the PPARalpha-knockout mouse does not represent a suitable model for the regulation of L-CPT I gene expression by LCFAs in the liver. Finally, we determined that clofibrate stimulates L-CPT I through a classical direct repeat 1 (DR1) motif in the promoter of the L-CPT I gene while LCFAs induce L-CPT I via elements in the first intron of the gene. Our results demonstrate that LCFAs can regulate gene expression through PPARalpha-independent pathways and suggest that the regulation of gene expression by dietary lipids is more complex than previously proposed.
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MESH Headings
- Animals
- Base Sequence
- Carnitine O-Palmitoyltransferase/genetics
- Cells, Cultured
- Clofibrate/pharmacology
- DNA Primers
- Enzyme Inhibitors/pharmacology
- Fatty Acids/physiology
- Female
- Gene Expression Regulation, Enzymologic/physiology
- Hepatocytes/drug effects
- Hepatocytes/metabolism
- Liver/enzymology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Promoter Regions, Genetic
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/physiology
- Transcription Factors/genetics
- Transcription Factors/physiology
- Tumor Cells, Cultured
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Affiliation(s)
- J F Louet
- Endocrinologie Métabolisme et Développement, CNRS UPR 1524, 9, rue Jules Hetzel, 92190 Meudon, France
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14
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Chatelain F, Pégorier JP, Minassian C, Bruni N, Tarpin S, Girard J, Mithieux G. Development and regulation of glucose-6-phosphatase gene expression in rat liver, intestine, and kidney: in vivo and in vitro studies in cultured fetal hepatocytes. Diabetes 1998; 47:882-9. [PMID: 9604863 DOI: 10.2337/diabetes.47.6.882] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.7] [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: 11/13/2022]
Abstract
The mRNA and the activity of glucose-6-phosphatase (Glc-6-Pase) were present in the liver, kidney, and small intestine of 15-day-old suckling rats, but were absent from the stomach, colon, lung, white and brown adipose tissues, muscle, heart, brain, and spleen. The mRNA encoding Glc-6-Pase was present in the liver of 21-day-old fetal rats and increased markedly immediately after birth. From 5 days after birth to the end of the suckling period, it returned to 50% of the level found in the liver of 48-h starved adult rats. When rats were weaned at 21 days onto a high-carbohydrate, low-fat (HCLF) diet, the concentration of liver Glc-6-Pase mRNA was markedly increased. In the fetal rat jejunum, the activity and mRNA of Glc-6-Pase were very low. It increased during the 5 days after birth and then declined to reach very low levels. Neither mRNA nor activity of Glc-6-Pase was present in the fetal kidney. They appeared and increased slowly during the suckling period to reach maximal levels 15 days after birth and then remained constant. Weaning onto the HCLF diet did not change the Glc-6-Pase gene expression, neither in the jejunum nor in the kidney. The regulation of Glc-6-Pase gene expression by hormones and nutrients was studied in cultured hepatocytes from 20-day-old rat fetuses. Bt2cAMP stimulated the Glc-6-Pase gene expression in a dose-dependent manner. This probably resulted from an increased gene transcription since the half-life of the transcript was not affected by dibutyryl cAMP (Bt2cAMP). The Bt2cAMP-induced Glc-6-Pase mRNA accumulation was antagonized by insulin in a dose-dependent manner. Long-chain fatty acids (LCFAs), but not medium-chain fatty acids, induced the accumulation of Glc-6-Pase mRNA and the stabilization of the transcript. The peroxisome proliferator, clofibrate, induced a threefold increase in Glc-6-Pase mRNA concentration. Both stimulation of Glc-6-Pase mRNA by LCFAs and clofibrate were inhibited by insulin. Increasing concentrations of glucose (from 0 to 20 mmol/l) did not affect the Bt2cAMP-induced Glc-6-Pase gene expression. By contrast, high glucose concentration (25 mmol/l) markedly induced the Glc-6-Pase gene expression in fed adult rat hepatocytes. The difference in the response to glucose between fetal and adult rat hepatocytes is discussed. We conclude that the rapid increase in hepatic Glc-6-Pase mRNA levels that accompanies the fetal-to-neonatal transition in the rat is triggered by the reciprocal change in circulating insulin and LCFA concentrations, coupled to the rise in liver cAMP concentration.
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MESH Headings
- Aging/metabolism
- Animals
- Animals, Newborn
- Bucladesine/pharmacology
- Cells, Cultured
- Clofibrate/pharmacology
- Diet, Fat-Restricted
- Dietary Carbohydrates
- Fatty Acids, Nonesterified/pharmacology
- Fatty Acids, Unsaturated/pharmacology
- Female
- Fetus
- Gene Expression Regulation, Developmental/drug effects
- Gene Expression Regulation, Enzymologic/drug effects
- Glucose-6-Phosphatase/biosynthesis
- Insulin/pharmacology
- Intestinal Mucosa/enzymology
- Intestinal Mucosa/growth & development
- Intestine, Small/enzymology
- Intestine, Small/growth & development
- Kidney/enzymology
- Kidney/growth & development
- Liver/enzymology
- Liver/growth & development
- Organ Specificity
- RNA, Messenger/biosynthesis
- Rats
- Rats, Wistar
- Transcription, Genetic/drug effects
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Affiliation(s)
- F Chatelain
- Endocrinologie, Métabolisme et Développement, CNRS (UPR 1524), Meudon-Bellevue, France
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15
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Pégorier JP, Chatelain F, Thumelin S, Girard J. Role of long-chain fatty acids in the postnatal induction of genes coding for liver mitochondrial beta-oxidative enzymes. Biochem Soc Trans 1998; 26:113-20. [PMID: 9649730 DOI: 10.1042/bst0260113] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- J P Pégorier
- Endocrinologie, Métabolisme et Développement, CNRS UPR 1524, Meudon-Bellevue, France
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16
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17
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Chatelain F, Kohl C, Esser V, McGarry JD, Girard J, Pegorier JP. Cyclic AMP and fatty acids increase carnitine palmitoyltransferase I gene transcription in cultured fetal rat hepatocytes. Eur J Biochem 1996; 235:789-98. [PMID: 8654430 DOI: 10.1111/j.1432-1033.1996.00789.x] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In the rat, the gene for liver mitochondrial carnitine palmitoyltransferase I (CPT I), though dormant prior to birth, is rapidly activated postnatally. We sought to elucidate which hormonal and/or nutritional factors might be responsible for this induction. In cultured hepatocytes from 20-day-old rat fetus, the concentration of CPT I mRNA, which initially was very low, increased dramatically in a dose-dependent manner after exposure of the cells to dibutyryl cAMP (Bt2cAMP). Similar results were obtained when long-chain fatty acids (LCFA), but not medium-chain fatty acids, were added to the culture medium. The effects of Bt2cAMP and LCFA were antagonized by insulin, also dose dependently. In contrast, CPT II gene expression, which was already high in fetal hepatocytes, was unaffected by any of the above manipulations. Bt2cAMP stimulated CPT I gene expression even when endogenous triacylglycerol breakdown was suppressed by lysosomotropic agents suggesting that the actions of cAMP and LCFA were distinct. Moreover, half-maximal concentrations of Bt2cAMP and linoleate produced an additive effect CPT I mRNA accumulation. While linoleate and Bt2cAMP stimulated CPT I gene transcription by twofold and fourfold, respectively, the fatty acid also increased the half-life of CPT I mRNA (50%). When hepatocytes were cultured in the presence of 2-bromopalmitate, (which is readily converted by cells into its non-metabolizable CoA ester) CPT I mRNA accumulation was higher than that observed with oleate or linoleate. Similarly, the CPT I inhibitor, tetradecylglycidate, which at a concentration of 20 microM did not itself influence the CPT I mRNA level, enhanced the stimulatory effect of linoleate. The implication is that induction of the CPT I message by LCFA does not require mitochondrial metabolism of these substrates; however, formation of their CoA esters is a necessary step. Unlike linoleate, the peroxisome proliferator, clofibrate, increased both CPT I and CPT II mRNA levels and neither effect was offset by insulin. It thus appears that the mechanism of action of LCFA differs from that utilized by clofibrate, which presumably works through the peroxisome proliferator activated receptor. We conclude that the rapid increase in hepatic CPT I mRNA level that accompanies the fetal to neonatal transition in the rat is triggered by the reciprocal change in circulating insulin and LCFA concentrations, coupled with elevation of the liver content of cAMP.
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Affiliation(s)
- F Chatelain
- Centre de Recherche sur 1'Endocrinologie Moléculaire et le Développement, CNRS, Meudon, France
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Prip-Buus C, Thumelin S, Chatelain F, Pegorier JP, Girard J. Hormonal and nutritional control of liver fatty acid oxidation and ketogenesis during development. Biochem Soc Trans 1995; 23:500-6. [PMID: 8566401 DOI: 10.1042/bst0230500] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- C Prip-Buus
- Centre de Recherche sur l'Endocrinologie Moléculaire et le Développement, CNRS, Meudon, France
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Peponnet C, Schaeffer V, Lepage V, Chatelain F, Rodde I, Alsayed J, Boucher P, Hermans P, Monplaisir/Cassius de Linval N, Charron D. Comparison of two HLA-DRB high resolution microtiter plate reverse hybridization typing methods: advantage of a codon-86 valine or glycine PCR segregation. Tissue Antigens 1995; 45:129-38. [PMID: 7792760 DOI: 10.1111/j.1399-0039.1995.tb02430.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Two rapid, nonisotopic, high-resolution HLA-DRB typing methods have been developed for DRB1, DRB3, DRB4 and DRB5 alleles. These methods are based on a single procedure consisting of the reverse hybridization of biotinylated amplicons to oligonucleotide probes that are covalently attached to a microtiter plate. Detection is by an enzymatic reaction with a fluorescent substrate. The 1 Generic Amplification (1GA) method amplifies all HLA-DRB alleles in the same reaction mix. The 2 Allelic Subset Amplification (2SA) method uses two distinct amplification reactions that distributes all DRB alleles into two equal-size subsets, according to the codon 86 Gly or Val polymorphism; this adds an extra discrimination level to the typing. 108 samples were typed using the 1GA and the 2SA methods and no discrepancies were found. Typing indeterminations due to overlapping probe combinations were compared; it was found that the 2SA method, with the extra discrimination level at the PCR step, greatly improved resolution.
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Goldwater SH, Chatelain F. Taking time to communicate. Am J Hosp Pharm 1994; 51:232, 235. [PMID: 8160674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Abstract
The purpose of this article is to review some mathematical models which are available to calibrate immunoassays and interpolate analyte concentration. Several curve fitting methods are available, but few of them are currently used. Point-to-point linear interpolation is prone to bias when the rate of curvature of the calibration curve or when the random error are high. Polygonal interpolation connects each neighboring pair of data points with multiple connected line segments. Neither smooths the data. Smoothing models are often preferred because they can correct some of the random error. Weighted least squares must be used when the calibration points have nonhomogeneous variance. The most used methods are empirical (spline function) or semi-empirical (logit-log, logistic). The logitlog straight line is often too rigid. Logistic equation can fit numerous assays. The best empirical model is the smoothed cubic spline. Model-based methods attempt to describe the data in terms of a given theoretical model for the assay chemistry. The choice of a method to efficiently control calculations must take into account the quality of the fit, the robustness with outliers, the proper computation of confidence limits and the user-friendliness. Errors associated with the different processing steps can also be due to the calibration point distribution, the axes in which the curve is shown, the model used, and, of course the measurement errors.
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Affiliation(s)
- M Baud
- Laboratoire de Biophysique Faculté de Médecine et Pharmacie, Besançon, FR
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Abstract
We first studied the effects of tricyclic antidepressants (TCAs) on thyroid function in rats in the learned helplessness paradigm. TCAs (clomipramine 32 mg/kg, desipramine 16, 24 mg/kg, or imipramine 8, 16, 32 mg/kg per day) were injected IP for 5 consecutive days. Blood samples were collected 1 hr after the last administration of the antidepressant for radioimmunoassay determination of triiodothyronine (T3) and thyrotropin. Whereas inducing helplessness did not result in any change in T3 and thyroid-stimulating hormone (TSH) levels, TCA therapy dose dependently decreased the T3 levels without changing TSH levels in helpless animals and in naive control rats. To further the investigation, the effects of TCAs on thyroid function were examined using two models of experimentation, one involving diabetes induction, the other using food deprivation; both are known to induce a resistance to TCAs that is reversible under T3 treatment. In both models, a decreased T3 level existed prior to the TCA administration. Although they had no effect on behavior, TCAs further decreased the T3 levels in diabetic and food-restricted rats. This study confirms that TCAs decrease thyroid function and suggests that the antidepressant effect of TCAs is not related to their T3 decreasing effects.
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Affiliation(s)
- J Massol
- Département de Pharmacologie, Faculté de Médicine, Pitié-Salpêtrière, Paris, France
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Wendling D, Mas J, Chatelain F, Guidet M. [Serum beta 2-microglobulin and ankylosing spondylitis]. Rev Rhum Mal Osteoartic 1989; 56:441-3. [PMID: 2662375] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The serum beta-2-microglobulin (B2-m) was evaluated by radio-immunoassay in 28 patients with ankylosing spondylarthritis. The mean B2-m level is within normal limits. There is no overall correlation with other biological or immunological parameters (Sed Rate, IgA, CD3+, CD4+, CD8+, Leu 7, NK activity). There is no difference between treated and untreated patients, between patients with recent or old disease. On the contrary, the mean the mean B2-m level is significantly lower in patients B27 positive, as compared with B27 negative. The possible role of anti-B2-m antibodies interfering with the serum B2-m assay discussed.
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Affiliation(s)
- D Wendling
- Service de Rhumatologie, Hôpital J.-Minjoz, Besançon
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Abstract
Diabetes is reportedly associated with alterations in peripheral and central noradrenergic systems. The latter might be involved in the antidepressant effects of imipramine-like drugs in both humans and animals. Therefore, it is possible that diabetics show an impaired responsiveness to tricyclics. To test this possibility the effects of streptozotocin (STZ)-induced experimental diabetes in mice were assessed in two psychopharmacological tests: 1) the reversal of apomorphine- (16 mg/kg) induced hypothermia and 2) the hypoactivity induced by a direct beta-agonist (clenbuterol 0.06 mg/kg). At day 15 after STZ or vehicle treatment, imipramine (4 mg/kg) antagonized the apomorphine-induced hypothermia in diabetic (D) and nondiabetic (ND) mice and clenbuterol produced hypoactivity in both groups. At day 30 and 45, the ability of imipramine (1, 2, 4, 8, 16 mg/kg), clomipramine (8 mg/kg) and desipramine (2 mg/kg) to reverse apomorphine-induced hypothermia disappeared at the same time that clenbuterol lost its ability to induce hypomotility in D mice. These impaired responses on both tests were corrected by a short period of insulin therapy. These two tests may reflect central beta-adrenergic functions. Therefore, these data suggest that the impaired responsiveness of diabetic mice might be due at least in part to a noradrenergic dysfunction. Possibly, in diabetes, a beta-adrenoceptor desensitization identical to that observed at the peripheral level occurs in the central nervous system. The possibility that a thyroid hormone deficiency may be involved was also tested. Decreased T3 plasma levels were found in D mice concomitant with the impaired pharmacological responses and T3 supplementation turned these responses to normal.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Massol
- Service de Diabétologie-Endocrinologie, Hôpital J. Minjoz, Besançon, France
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Humbert P, Mas J, Monnier G, Carbillet JP, Chatelain F, Montcuquet P, Dupond JL. [Denny-Brown sensory neuropathy disclosing a bilateral ovarian adenocarcinoma]. Rev Fr Gynecol Obstet 1988; 83:723-6. [PMID: 3206097] [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] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The authors report the case of a 76 year-old woman examined because of occurrence of a paraneoplastic sensory neuropathy. Three months later, she developed a left inguinal adenopathy, metastasis of a bilateral ovarian adenocarcinoma. This case of particular interest in view of the way the neoplasm was discovered. The sensory neuropathy was previously reported to be associated with an ovarian cancer in only one case of the literature. Besides the tumor masse only limited to a left inguinal adenopathy, in this case emphasizes the ability of these rare metastasis. The ovarian cancer-associated antigen CA 125 is particularly useful for the diagnosis when high levels are found. In the absence of a pelvic tumor masse, the paraneoplastic sensory neuropathy, as well as the high levels of CA 125, have resulted in an exploratory laparotomy with extemporaneous examination of the ovaries, enabling to make the diagnosis of bilateral ovarian adenocarcinoma.
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Affiliation(s)
- P Humbert
- Département de Médecine Interne, CHU Jean-Minjoz, Besançon
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Gernez-Lestradet C, Mollet E, Chatelain F, Massol J. [Unusual etiology of free hyperthyroxinemia]. Arch Fr Pediatr 1987; 44:231-2. [PMID: 3579488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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