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Rousseau-Ralliard D, Valentino SA, Aubrière MC, Dahirel M, Lallemand MS, Archilla C, Jouneau L, Fournier N, Richard C, Aioun J, Vitorino Carvalho A, Jérôme L, Slama R, Duranthon V, Cassee FR, Chavatte-Palmer P, Couturier-Tarrade A. Effects of first-generation in utero exposure to diesel engine exhaust on second-generation placental function, fatty acid profiles and foetal metabolism in rabbits: preliminary results. Sci Rep 2019; 9:9710. [PMID: 31273257 PMCID: PMC6609606 DOI: 10.1038/s41598-019-46130-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 05/31/2018] [Accepted: 06/19/2019] [Indexed: 12/19/2022] Open
Abstract
Atmospheric pollution has major health effects on directly exposed subjects but intergenerational consequences are poorly characterized. We previously reported that diesel engine exhaust (DE) could lead to structural changes in the placenta of in utero exposed rabbits (first generation, F1). The effects of maternal exposure to DE were further studied on second-generation (F2) rabbits. Pregnant F0 females were exposed to filtered, diluted DE (1 mg/m3, median particle diameter: 69 nm) or clean filtered air (controls) for 2 h/day, 5 days/week by nose-only exposure during days 3–27 post-conception (dpc). Adult female offspring (F1) were mated to control males: F1 tissues and F2 foeto-placental units were collected at 28 dpc and placental structure and gene expression (microarray) analysed. Fatty acid profiles were determined in foetal and maternal plasma, maternal liver and placenta. In F1, compared to controls, hepatic neutral lipid contents were increased in exposed animals without change in the blood biochemistry. In F2, the placental lipid contents were higher, with higher monounsaturated fatty acids and reduced pro-inflammatory arachidonic acid (AA), without placental structural changes. Conversely, the proportion of anti-inflammatory n-3 polyunsaturated fatty acids in F2 plasma was increased while that of AA was decreased. Gene set enrichment analyses (GSEA) of F2 placenta transcriptomic data identified that the proteasome complex and ubiquitin pathways genes were over-represented and ion channel function and inflammation pathways genes were under-represented in exposed animals. These preliminary results demonstrate that diesel engine exhaust exposure and in utero indirect exposure should be considered as a programming factor within the context of the DOHaD (Developmental Origins of Health and Disease) with a probable intergenerational transmission.
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Affiliation(s)
- Delphine Rousseau-Ralliard
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France. .,PremUp Foundation, Paris, France.
| | - Sarah A Valentino
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | - Marie-Christine Aubrière
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | - Michèle Dahirel
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | - Marie-Sylvie Lallemand
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | | | - Luc Jouneau
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France
| | - Natalie Fournier
- University Paris-Sud, EA 4041/4529 Lip (Sys)2, UFR de Pharmacie, Châtenay-Malabry, France.,Hôpital Européen Georges Pompidou (AP-HP), Laboratoire de Biochimie, UF Cardio-Vasculaire, Paris, France
| | - Christophe Richard
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | - Josiane Aioun
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | | | | | - Rémy Slama
- Inserm, Univ. Grenoble Alpes, CNRS, IAB joint Research Center, Team of Environmental Epidemiology Applied to Reproduction and Respiratory Health, Grenoble, France
| | | | - Flemming R Cassee
- Centre for Sustainability, Environment and Health, National Institute for Public Health and the Environment, Bilthoven, Netherlands.,Institute of Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands
| | - Pascale Chavatte-Palmer
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France.,PremUp Foundation, Paris, France
| | - Anne Couturier-Tarrade
- UMR BDR, INRA, ENVA, Université Paris Saclay, Jouy en Josas, France. .,PremUp Foundation, Paris, France.
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Robles M, Couturier-Tarrade A, Derisoud E, Geeverding A, Dubois C, Dahirel M, Aioun J, Prezelin A, Calvez J, Richard C, Wimel L, Chavatte-Palmer P. Effects of dietary arginine supplementation in pregnant mares on maternal metabolism, placental structure and function and foal growth. Sci Rep 2019; 9:6461. [PMID: 31015538 PMCID: PMC6478728 DOI: 10.1038/s41598-019-42941-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 11/14/2018] [Accepted: 03/27/2019] [Indexed: 12/17/2022] Open
Abstract
Foals born to primiparous mares are lighter and less mature than those born to multiparous dams. Factors driving this difference are not totally understood. Using 7 multiparous and 6 primiparous standardbred mares, we demonstrated that, in late gestation, primiparous mares were less insulin resistant compared to multiparous mares, and that their foals had reduced plasma amino-acid concentrations at birth compared to foals born to multiparous mares. Vascular development, as observed through structure and gene expression, and global DNA methylation were also reduced in primiparous placentas. Another group of 8 primiparous mares was orally supplemented with L-arginine (100 g/day, 210d to term). L-arginine improved pregnancy-induced insulin resistance and increased maternal L-arginine and L-ornithine plasma concentrations but foal plasma amino acid concentrations were not affected at birth. At birth, foal weight and placental biometry, structure, ultra-structure and DNA methylation were not modified. Placental expression of genes involved in glucose and fatty acid transfers was increased. In conclusion, maternal insulin resistance in response to pregnancy and placental function are reduced in primiparous pregnancies. Late-gestation L-arginine supplementation may help primiparous mares to metabolically adapt to pregnancy and improve placental function. More work is needed to confirm these effects and ascertain optimal treatment conditions.
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Affiliation(s)
- Morgane Robles
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | | | - Emilie Derisoud
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - Audrey Geeverding
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - Cedric Dubois
- IFCE, Station Expérimentale de la Valade, 19370 Chamberet, France
| | - Michele Dahirel
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - Josiane Aioun
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - Audrey Prezelin
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - Juliane Calvez
- UMR PNCA, AgroParisTech, INRA, Université Paris Saclay, 75005 Paris, France
| | - Christophe Richard
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - Laurence Wimel
- IFCE, Station Expérimentale de la Valade, 19370 Chamberet, France
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Bernal-Meléndez E, Lacroix MC, Bouillaud P, Callebert J, Olivier B, Persuy MA, Durieux D, Rousseau-Ralliard D, Aioun J, Cassee F, Couturier-Tarrade A, Valentino S, Chavatte-Palmer P, Schroeder H, Baly C. Repeated gestational exposure to diesel engine exhaust affects the fetal olfactory system and alters olfactory-based behavior in rabbit offspring. Part Fibre Toxicol 2019; 16:5. [PMID: 30654819 PMCID: PMC6335688 DOI: 10.1186/s12989-018-0288-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 12/20/2018] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Airborne pollution, especially from diesel exhaust (DE), is known to have a negative effect on the central nervous system in exposed human populations. However, the consequences of gestational exposure to DE on the fetal brain remain poorly explored, with various effects depending on the conditions of exposure, as well as little information on early developmental stages. We investigated the short-term effects of indirect DE exposure throughout gestation on the developing brain using a rabbit model. We analyzed fetal olfactory tissues at the end of gestation and tested behaviors relevant to pups' survival at birth. Pregnant dams were exposed by nose-only inhalation to either clean air or DE with a content of particles (DEP) adjusted to 1 mg/m3 by diluting engine exhaust, for 2 h/day, 5 days/week, from gestational day 3 (GD3) to day 27 (GD27). At GD28, fetal olfactory mucosa, olfactory bulbs and whole brains were collected for anatomical and neurochemical measurements. At postnatal day 2 (PND2), pups born from another group of exposed or control female were examined for their odor-guided behavior in response to the presentation of the rabbit mammary pheromone 2-methyl-3-butyn-2-ol (2MB2). RESULTS At GD28, nano-sized particles were observed in cilia and cytoplasm of the olfactory sensory neurons in the olfactory mucosa and in the cytoplasm of periglomerular cells in the olfactory bulbs of exposed fetuses. Moreover, cellular and axonal hypertrophies were observed throughout olfactory tissues. Concomitantly, fetal serotoninergic and dopaminergic systems were affected in the olfactory bulbs. Moreover, the neuromodulatory homeostasis was disturbed in a sex-dependent manner in olfactory tissues. At birth, the olfactory sensitivity to 2MB2 was reduced in exposed PND2 pups. CONCLUSION Gestational exposure to DE alters olfactory tissues and affects monoaminergic neurotransmission in fetuses' olfactory bulbs, resulting in an alteration of olfactory-based behaviors at birth. Considering the anatomical and functional continuum between the olfactory system and other brain structures, and due to the importance of monoamine neurotransmission in the plasticity of neural circuits, such alterations could participate to disturbances in higher integrative structures, with possible long-term neurobehavioral consequences.
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Affiliation(s)
- Estefanía Bernal-Meléndez
- NeuroBiologie de l'Olfaction, INRA, Université Paris-Saclay, 78350, Jouy-en-Josas, France.,CALBINOTOX, Université de Lorraine, EA7488, Vandœuvre-lès-Nancy, France
| | | | | | - Jacques Callebert
- Service de Biochimie et Biologie Moléculaire, Hôpital Lariboisière, Paris, France
| | - Benoit Olivier
- CALBINOTOX, Université de Lorraine, EA7488, Vandœuvre-lès-Nancy, France
| | - Marie-Annick Persuy
- NeuroBiologie de l'Olfaction, INRA, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Didier Durieux
- NeuroBiologie de l'Olfaction, INRA, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | | | - Josiane Aioun
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350, Jouy-en-Josas, France
| | - Flemming Cassee
- Center for Sustainability, Environment and Health, National Institute for Public Health and the Environment, Bilthoven, Netherlands.,Institute of Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands
| | | | - Sarah Valentino
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350, Jouy-en-Josas, France
| | | | - Henri Schroeder
- CALBINOTOX, Université de Lorraine, EA7488, Vandœuvre-lès-Nancy, France
| | - Christine Baly
- NeuroBiologie de l'Olfaction, INRA, Université Paris-Saclay, 78350, Jouy-en-Josas, France.
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Valentino S, Duranthon V, Tarrade A, Rousseau-Ralliard, Mourier E, Richard C, Aioun J, Daniel N, Archilla C, Peynot N, Fournier N, Guinot M, Jolivet G, Levy R, Bourdon M, Torres-Rovira L, Jouneau L, Charlier M, Boere J, Agier L, Slama R, Cassee F, Chavatte-Palmer P. Reproductive effects of gestational exposure to diesel exhaust in a rabbit model. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.07.100] [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: 10/20/2022]
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Valentino SA, Tarrade A, Aioun J, Mourier E, Richard C, Dahirel M, Rousseau-Ralliard D, Fournier N, Aubrière MC, Lallemand MS, Camous S, Guinot M, Charlier M, Aujean E, Al Adhami H, Fokkens PH, Agier L, Boere JA, Cassee FR, Slama R, Chavatte-Palmer P. Maternal exposure to diluted diesel engine exhaust alters placental function and induces intergenerational effects in rabbits. Part Fibre Toxicol 2016; 13:39. [PMID: 27460165 PMCID: PMC4962477 DOI: 10.1186/s12989-016-0151-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [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: 02/08/2016] [Accepted: 07/19/2016] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Airborne pollution is a rising concern in urban areas. Epidemiological studies in humans and animal experiments using rodent models indicate that gestational exposure to airborne pollution, in particular diesel engine exhaust (DE), reduces birth weight, but effects depend on exposure duration, gestational window and nanoparticle (NP) concentration. Our aim was to evaluate the effects of gestational exposure to diluted DE on feto-placental development in a rabbit model. Pregnant females were exposed to diluted (1 mg/m(3)), filtered DE (NP diameter ≈ 69 nm) or clean air (controls) for 2 h/day, 5 days/week by nose-only exposure (total exposure: 20 days in a 31-day gestation). RESULTS DE exposure induced early signs of growth retardation at mid gestation with decreased head length (p = 0.04) and umbilical pulse (p = 0.018). Near term, fetal head length (p = 0.029) and plasma insulin and IGF1 concentrations (p = 0.05 and p = 0.019) were reduced. Placental function was also affected, with reduced placental efficiency (fetal/placental weight) (p = 0.049), decreased placental blood flow (p = 0.009) and fetal vessel volume (p = 0.002). Non-aggregated and "fingerprint" NP were observed at various locations, in maternal blood space, in trophoblastic cells and in the fetal blood, demonstrating transplacental transfer. Adult female offspring were bred with control males. Although fetoplacental biometry was not affected near term, second generation fetal metabolism was modified by grand-dam exposure with decreased plasma cholesterol (p = 0.008) and increased triglyceride concentrations (p = 0.015). CONCLUSIONS Repeated daily gestational exposure to DE at levels close to urban pollution can affect feto-placental development in the first and second generation.
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Affiliation(s)
- Sarah A. Valentino
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Anne Tarrade
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Josiane Aioun
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Eve Mourier
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Christophe Richard
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Michèle Dahirel
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Delphine Rousseau-Ralliard
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Natalie Fournier
- UFR de Pharmacie, Univ Paris-Sud, EA 4041/4529 Lip (Sys), Châtenay-Malabry, France
- Hôpital Européen Georges Pompidou (AP-HP), Laboratoire de Biochimie, UF Cardio-Vasculaire, Paris, France
| | - Marie-Christine Aubrière
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Marie-Sylvie Lallemand
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Sylvaine Camous
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Marine Guinot
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Madia Charlier
- INRA, UMR1313 Génétique Animale et Biologie Intégrative, Jouy en Josas, France
| | - Etienne Aujean
- INRA, UMR1313 Génétique Animale et Biologie Intégrative, Jouy en Josas, France
| | - Hala Al Adhami
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
| | - Paul H. Fokkens
- Centre for Sustainability, Environment and Health, National Institute for Public Health and the Environment, Bilthoven, Netherlands
| | - Lydiane Agier
- Inserm and Univ. Grenoble Alpes, U823, IAB Research Center, Team of Environmental Epidemiology Applied to Reproduction and Respiratory Health, Grenoble, France
| | - John A. Boere
- Centre for Sustainability, Environment and Health, National Institute for Public Health and the Environment, Bilthoven, Netherlands
| | - Flemming R. Cassee
- Centre for Sustainability, Environment and Health, National Institute for Public Health and the Environment, Bilthoven, Netherlands
- Institute of Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands
| | - Rémy Slama
- Inserm and Univ. Grenoble Alpes, U823, IAB Research Center, Team of Environmental Epidemiology Applied to Reproduction and Respiratory Health, Grenoble, France
| | - Pascale Chavatte-Palmer
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
- PremUp Foundation, Paris, France
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Mony MC, Aioun J, Larras-Regard E. Comparative localization and quantification of electrolytes in cardiac cells after chemical or rapid freeze fixation. A secondary ion mass spectrometry study (SIMS) in control and Li-treated mice. Biol Cell 2012. [DOI: 10.1016/0248-4900(88)90132-3] [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: 11/24/2022]
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Baly C, Aioun J, Badonnel K, Lacroix MC, Durieux D, Schlegel C, Salesse R, Caillol M. Leptin and its receptors are present in the rat olfactory mucosa and modulated by the nutritional status. Brain Res 2006; 1129:130-41. [PMID: 17169337 DOI: 10.1016/j.brainres.2006.10.030] [Citation(s) in RCA: 56] [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: 08/17/2006] [Revised: 10/17/2006] [Accepted: 10/17/2006] [Indexed: 12/15/2022]
Abstract
Leptin is an adipocyte-derived cytokine that regulates body weight mainly via the long form of the leptin receptor (Ob-Rb). Leptin and its receptors are expressed in several tissues, suggesting that leptin might also be effective peripherally. We hypothesized that, as shown in taste cells, leptin and its receptors isoforms (Ob-Rs) could be present in the rat olfactory mucosa (OM). Using RT-PCR, light and electron microscopy immunohistochemistry (ICC), we found that different isoforms of the receptor were expressed in OM and localized in sustentacular cells and in a subpopulation of maturating neurons; in addition, immunoreactivity was also present in differentiated neurons and enriched at the cilia membranes, where the odorants bind to their receptors. Moreover, using RT-PCR, ICC and RIA measurements, we showed that leptin is synthesized locally in the olfactory mucosa. In addition, we demonstrate that fasting causes a significant enhanced transcription of both leptin and Ob-Rs in rat OM by quantitative RT-PCR data. Altogether, these results strongly suggested that leptin, acting as an endocrine or a paracrine factor, could be an important regulator of olfactory function, as a neuromodulator of the olfactory message in cilia of mature olfactory receptors neurons (ORN), but also for the homeostasis of this complex tissue, acting on differentiating neurons and on sustentacular cells.
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Affiliation(s)
- Christine Baly
- Equipe Récepteurs et Communication Chimique, UMR1197 Institut National de la Recherche Agronomique-Université Paris 11, CRJ, Domaine de Vilvert, 78352 Jouy-en-Josas Cedex, France.
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8
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Vidic JM, Grosclaude J, Persuy MA, Aioun J, Salesse R, Pajot-Augy E. Quantitative assessment of olfactory receptors activity in immobilized nanosomes: a novel concept for bioelectronic nose. Lab Chip 2006; 6:1026-32. [PMID: 16874373 DOI: 10.1039/b603189g] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We describe how mammalian olfactory receptors (ORs) could be used as sensing elements of highly specific and sensitive bioelectronic noses. An OR and an appropriate G(alpha) protein were co-expressed in Saccharomyces cerevisiae cells from which membrane nanosomes were prepared, and immobilized on a sensor chip. By Surface Plasmon Resonance, we were able to quantitatively evaluate OR stimulation by an odorant, and G protein activation. We demonstrate that ORs in nanosomes discriminate between odorant ligands and unrelated odorants, as in whole cells. This assay also provides the possibility for quantitative assessment of the coupling efficiency of the OR with different G(alpha) subunits, without the interference of the cellular transduction pathway. Our findings will be useful to develop a new generation of electronic noses for detection and discrimination of volatile compounds, particularly amenable to micro- and nano-sensor formats.
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Affiliation(s)
- Jasmina Minic Vidic
- Unité de Neurobiologie de l'Olfaction et de la Prise Alimentaire, Equipe Récepteurs et Communication Chimique, Institut National de la Recherche Agronomique, 78352 Jouy-en-Josas Cedex, France.
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9
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Minic J, Grosclaude J, Aioun J, Persuy MA, Gorojankina T, Salesse R, Pajot-Augy E, Hou Y, Helali S, Jaffrezic-Renault N, Bessueille F, Errachid A, Gomila G, Ruiz O, Samitier J. Immobilization of native membrane-bound rhodopsin on biosensor surfaces. Biochim Biophys Acta Gen Subj 2005; 1724:324-32. [PMID: 15927400 DOI: 10.1016/j.bbagen.2005.04.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [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: 02/23/2005] [Revised: 04/12/2005] [Accepted: 04/13/2005] [Indexed: 11/16/2022]
Abstract
In this paper, we evaluated the grafting of G-protein-coupled receptors (GPCRs) onto functionalized surfaces, which is a primary requirement to elaborate receptor-based biosensors, or to develop novel GPCR assays. Bovine rhodopsin, a prototypical GPCR, was used in the form of receptor-enriched membrane fraction. Quantitative immobilization of the membrane-bound rhodopsin either non-specifically on a carboxylated dextran surface grafted with long alkyl groups, or specifically on a surface coated with anti-rhodopsin antibody was demonstrated by surface plasmon resonance. In addition, a new substrate based on mixed self-assembled multilayer that anchors specific anti-receptor antibodies was developed. Electrochemical impedance spectroscopy performed upon deposition of membrane-bound rhodopsin of increasing concentration exhibited a significant change, until a saturation level was reached, indicating optimum receptor immobilization on the substrate. The structures obtained with this new immobilization procedure of the rhodopsin in its native membrane environment are stable, with a controlled density of specific anchoring sites. Therefore, such receptor immobilization method is attractive for a range of applications, especially in the field of GPCR biosensors.
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Affiliation(s)
- Jasmina Minic
- INRA, Neurobiologie de l'Olfaction et de la Prise Alimentaire, Equipe Récepteurs et Communication Chimique, Domaine de Vilvert, 78352 Jouy-en-Josas Cedex, France
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10
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Minic J, Persuy MA, Godel E, Aioun J, Connerton I, Salesse R, Pajot-Augy E. Functional expression of olfactory receptors in yeast and development of a bioassay for odorant screening. FEBS J 2004; 272:524-37. [PMID: 15654890 DOI: 10.1111/j.1742-4658.2004.04494.x] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.2] [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: 11/29/2022]
Abstract
The functional expression of olfactory receptors (ORs) is a primary requirement to examine the molecular mechanisms of odorant perception and coding. Functional expression of the rat I7 OR and its trafficking to the plasma membrane was achieved under optimized experimental conditions in the budding yeast Saccharomyces cerevisiae. The membrane expression of the receptor was shown by Western blotting and immunolocalization methods. Moreover, we took advantage of the functional similarities between signal transduction cascades of G protein-coupled receptor in mammalian cells and the pheromone response pathway in yeast to develop a novel biosensor for odorant screening using luciferase as a functional reporter. Yeasts were engineered to coexpress I7 OR and mammalian G(alpha) subunit, to compensate for the lack of endogenous Gpa1 subunit, so that stimulation of the receptor by its ligands activates a MAP kinase signaling pathway and induces luciferase synthesis. The sensitivity of the bioassay was significantly enhanced using mammalian G(olf) compared to the G(alpha15) subunit, resulting in dose-dependent responses of the system. The biosensor was probed with an array of odorants to demonstrate that the yeast-borne I7 OR retains its specificity and selectivity towards ligands. The results are confirmed by functional expression and bioluminescence response of human OR17-40 to its specific ligand, helional. Based on these findings, the bioassay using the luciferase reporter should be amenable to simple, rapid and inexpensive odorant screening of hundreds of ORs to provide insight into olfactory coding mechanisms.
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Affiliation(s)
- Jasmina Minic
- INRA, Neurobiologie de l'Olfaction et de la Prise Alimentaire, Récepteurs et Communication Clinique, Domaine de Vilvert, 78352 Jouy-en-Josas, France
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