1
|
Nalio Ramos R, Missolo-Koussou Y, Gerber-Ferder Y, Bromley CP, Bugatti M, Núñez NG, Tosello Boari J, Richer W, Menger L, Denizeau J, Sedlik C, Caudana P, Kotsias F, Niborski LL, Viel S, Bohec M, Lameiras S, Baulande S, Lesage L, Nicolas A, Meseure D, Vincent-Salomon A, Reyal F, Dutertre CA, Ginhoux F, Vimeux L, Donnadieu E, Buttard B, Galon J, Zelenay S, Vermi W, Guermonprez P, Piaggio E, Helft J. Tissue-resident FOLR2 + macrophages associate with CD8 + T cell infiltration in human breast cancer. Cell 2022; 185:1189-1207.e25. [PMID: 35325594 DOI: 10.1016/j.cell.2022.02.021] [Citation(s) in RCA: 137] [Impact Index Per Article: 68.5] [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: 11/16/2020] [Revised: 10/08/2021] [Accepted: 02/15/2022] [Indexed: 12/12/2022]
Abstract
Macrophage infiltration is a hallmark of solid cancers, and overall macrophage infiltration correlates with lower patient survival and resistance to therapy. Tumor-associated macrophages, however, are phenotypically and functionally heterogeneous. Specific subsets of tumor-associated macrophage might be endowed with distinct roles on cancer progression and antitumor immunity. Here, we identify a discrete population of FOLR2+ tissue-resident macrophages in healthy mammary gland and breast cancer primary tumors. FOLR2+ macrophages localize in perivascular areas in the tumor stroma, where they interact with CD8+ T cells. FOLR2+ macrophages efficiently prime effector CD8+ T cells ex vivo. The density of FOLR2+ macrophages in tumors positively correlates with better patient survival. This study highlights specific roles for tumor-associated macrophage subsets and paves the way for subset-targeted therapeutic interventions in macrophages-based cancer therapies.
Collapse
Affiliation(s)
- Rodrigo Nalio Ramos
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Yoann Missolo-Koussou
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Yohan Gerber-Ferder
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Christian P Bromley
- Cancer Inflammation and Immunity Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, Manchester, UK
| | - Mattia Bugatti
- Department of Pathology, University of Brescia, Brescia 25123, Italy
| | - Nicolas Gonzalo Núñez
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Jimena Tosello Boari
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Wilfrid Richer
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Laurie Menger
- PSL University, Institut Curie Research Center, INSERM U932, 75005 Paris, France
| | - Jordan Denizeau
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Christine Sedlik
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Pamela Caudana
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Fiorella Kotsias
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Leticia L Niborski
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Sophie Viel
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Mylène Bohec
- PSL University, Institut Curie Research Center, Institut Curie Genomics of Excellence Platform, 75005 Paris, France
| | - Sonia Lameiras
- PSL University, Institut Curie Research Center, Institut Curie Genomics of Excellence Platform, 75005 Paris, France
| | - Sylvain Baulande
- PSL University, Institut Curie Research Center, Institut Curie Genomics of Excellence Platform, 75005 Paris, France
| | - Laëtitia Lesage
- PSL University, Institut Curie Hospital, Department of Pathology, 75005 Paris, France
| | - André Nicolas
- PSL University, Institut Curie Hospital, Department of Pathology, 75005 Paris, France
| | - Didier Meseure
- PSL University, Institut Curie Hospital, Department of Pathology, 75005 Paris, France
| | - Anne Vincent-Salomon
- PSL University, Institut Curie Hospital, Department of Pathology, 75005 Paris, France
| | - Fabien Reyal
- PSL University, Institut Curie Hospital, Department of Surgery, 75005 Paris, France
| | | | - Florent Ginhoux
- Université Paris-Saclay, Institut Gustave Roussy, INSERM U1015, Villejuif, France; Singapore Immunology Network, Agency for Science, Technology and Research, Singapore 138648, Singapore
| | - Lene Vimeux
- University of Paris, Institut Cochin, INSERM U1016, CNRS UMR 8104, 75014 Paris, France
| | - Emmanuel Donnadieu
- University of Paris, Institut Cochin, INSERM U1016, CNRS UMR 8104, 75014 Paris, France
| | - Bénédicte Buttard
- INSERM, Sorbonne Université, Université de Paris, Centre de Recherche des Cordeliers, Laboratory of Integrative Cancer Immunology, Paris, France
| | - Jérôme Galon
- INSERM, Sorbonne Université, Université de Paris, Centre de Recherche des Cordeliers, Laboratory of Integrative Cancer Immunology, Paris, France
| | - Santiago Zelenay
- Cancer Inflammation and Immunity Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, Manchester, UK
| | - William Vermi
- PSL University, Institut Curie Research Center, INSERM U932, 75005 Paris, France; Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Pierre Guermonprez
- Université de Paris, Centre for Inflammation Research, CNRS ERL8252, INSERM1149, Paris, France
| | - Eliane Piaggio
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France
| | - Julie Helft
- PSL University, Institut Curie Research Center, INSERM U932 & SiRIC, Translational Immunotherapy Team, 75005 Paris, France.
| |
Collapse
|
2
|
Melka J, Helbert A, Lesage L, Moreau K, Romariz K, Berson P, Isabelle M, Delerive P, Tyl B. Ventricular arrhythmia susceptibility in a new porcine model of heart failure (HF) with reduced ejection fraction. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3312] [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
Introduction
Sudden death secondary to ventricular arrhythmias is common in HF patients, with no effective treatment available outside of implantable cardiac defibrillators. While animal models are essential for the discovery of anti-arrhythmic drugs, no reliable large animal HF models with associated ventricular arrhythmias have been described so far.
Objectives
We aimed at evaluating ventricular remodeling and arrhythmia susceptibility in an HF pig model with reduced ejection fraction (EF) following myocardial infarction (MI).
Methods
MI was induced in 53 male Göttingen minipigs (12–15 months, 20–25 kg) by coronary embolization in mid-left anterior descending and mid-left circumflex coronary arteries using endovascular coils. Seven other pigs underwent sham operation and were used as control. Two weeks after surgery, cardiac function was assessed by echocardiography, and animals were included based on EF<50% (n=15/53), assigned either to 12 weeks of vehicle (n=9) or perindopril (n=6, 1 mg/kg/d, per os) group. At the end of the study, their left ventricular (LV) electrical remodeling was studied by echocardiography/electrocardiography and a programmed-electrical stimulation protocol was performed to evaluate the susceptibility to develop ventricular arrhythmias.
Results
At the end of the study, animals in the vehicle group had a significant LV remodeling associated with a reduced EF (p<0.05 vs. sham, see table). This remodeling was associated with cardio-pulmonary congestion, significant increases in LV end-diastolic pressure, left atrial volume, and lung mass (all p<0.05 vs. sham, see table), fully prevented by perindopril treatment. They had also an electrical remodeling as evidenced by an increase in PR, QRS, and QTc intervals, as well as LV effective refractory period (+18%, 14%, 33%, and 13%, respectively, p<0.05, compared to sham animals). Electrical changes were mitigated by perindopril treatment (p=NS vs. sham). LV mechanical dispersion measured with speckle-tracking echocardiography was significantly increased in vehicle group (58±5 vs. 22±1 ms in sham group, respectively) as well as in perindopril group. Programmed-electrical stimulations induced in 6/8 vehicle animals either non-sustained (n=3) or sustained (n=2) ventricular tachycardia, or ventricular fibrillation (n=1). In sham group only 1/7 animal had a ventricular fibrillation. No inducible ventricular arrhythmia was observed in animals treated with Perindopril.
Conclusion
In this new pig model of congestive HF with reduced EF, LV remodeling was associated with electrical remodeling and susceptibility to develop arrhythmias. Chronic angiotensin-converting enzyme inhibitor treatment prevented congestion, mitigated electrical remodeling, and suppressed arrhythmia susceptibility.
Funding Acknowledgement
Type of funding sources: Private company. Main funding source(s): Servier Research Institute - CardioVascular & Metabolic Diseases Center for Therapeutic Innovation Table 1
Collapse
Affiliation(s)
- J Melka
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - A Helbert
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - L Lesage
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - K Moreau
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - K Romariz
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - P Berson
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - M Isabelle
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - P Delerive
- Servier Research Institute, CardioVascular & Metabolic Research Department, Suresnes, France
| | - B Tyl
- Servier Research Institute, CardioVascular & Metabolic Translationnal Department, Suresnes, France
| |
Collapse
|
3
|
Fontaine V, Monteiro E, Brazhnikova E, Lesage L, Balducci C, Guibout L, Feraille L, Elena PP, Sahel JA, Veillet S, Lafont R. Norbixin Protects Retinal Pigmented Epithelium Cells and Photoreceptors against A2E-Mediated Phototoxicity In Vitro and In Vivo. PLoS One 2016; 11:e0167793. [PMID: 27992460 PMCID: PMC5161507 DOI: 10.1371/journal.pone.0167793] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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: 06/24/2016] [Accepted: 11/20/2016] [Indexed: 12/31/2022] Open
Abstract
The accumulation of N-retinylidene-N-retinylethanolamine (A2E, a toxic by-product of the visual pigment cycle) in the retinal pigment epithelium (RPE) is a major cause of visual impairment in the elderly. Photooxidation of A2E results in retinal pigment epithelium degeneration followed by that of associated photoreceptors. Present treatments rely on nutrient supplementation with antioxidants. 9’-cis-Norbixin (a natural diapocarotenoid, 97% purity) was prepared from Bixa orellana seeds. It was first evaluated in primary cultures of porcine retinal pigment epithelium cells challenged with A2E and illuminated with blue light, and it provided an improved photo-protection as compared with lutein or zeaxanthin. In Abca4-/-Rdh8-/- mice (a model of dry AMD), intravitreally-injected norbixin maintained the electroretinogram and protected photoreceptors against light damage. In a standard rat blue-light model of photodamage, norbixin was at least equally as active as phenyl-N-tert-butylnitrone, a free radical spin-trap. Chronic experiments performed with Abca4-/-Rdh8-/- mice treated orally for 3 months with norbixin showed a reduced A2E accumulation in the retina. Norbixin appears promising for developing an oral treatment of macular degeneration. A drug candidate (BIO201) with 9’-cis-norbixin as the active principle ingredient is under development, and its potential will be assessed in a forthcoming clinical trial.
Collapse
Affiliation(s)
- Valérie Fontaine
- Sorbonne Universités, UPMC Univ Paris, INSERM, CNRS, Institut de la Vision, 17 Rue Moreau, Paris, France
- * E-mail:
| | - Elodie Monteiro
- Sorbonne Universités, UPMC Univ Paris, INSERM, CNRS, Institut de la Vision, 17 Rue Moreau, Paris, France
| | - Elena Brazhnikova
- Sorbonne Universités, UPMC Univ Paris, INSERM, CNRS, Institut de la Vision, 17 Rue Moreau, Paris, France
| | - Laëtitia Lesage
- Sorbonne Universités, UPMC Univ Paris, INSERM, CNRS, Institut de la Vision, 17 Rue Moreau, Paris, France
| | - Christine Balducci
- Biophytis, Parc BIOCITECH, 102 Avenue Gaston Roussel, Romainville, France
| | - Louis Guibout
- Biophytis, Parc BIOCITECH, 102 Avenue Gaston Roussel, Romainville, France
| | | | | | - José-Alain Sahel
- Sorbonne Universités, UPMC Univ Paris, INSERM, CNRS, Institut de la Vision, 17 Rue Moreau, Paris, France
| | - Stanislas Veillet
- Biophytis, Parc BIOCITECH, 102 Avenue Gaston Roussel, Romainville, France
| | - René Lafont
- Biophytis, Parc BIOCITECH, 102 Avenue Gaston Roussel, Romainville, France
| |
Collapse
|
4
|
Lucas F, Gonçalves A, Servais P, Rocher V, Masnada S, Therial C, Lesage L, Mouchel J. Variabilité de la qualité microbiologique des eaux usées brutes dans une grande agglomération. ACTA ACUST UNITED AC 2014. [DOI: 10.1051/tsm/201204044] [Citation(s) in RCA: 3] [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: 11/14/2022]
|
5
|
N'Tumba-Byn T, Moison D, Lacroix M, Lecureuil C, Lesage L, Prud'homme SM, Pozzi-Gaudin S, Frydman R, Benachi A, Livera G, Rouiller-Fabre V, Habert R. Differential effects of bisphenol A and diethylstilbestrol on human, rat and mouse fetal leydig cell function. PLoS One 2012; 7:e51579. [PMID: 23284716 PMCID: PMC3524173 DOI: 10.1371/journal.pone.0051579] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [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: 06/28/2012] [Accepted: 11/01/2012] [Indexed: 01/23/2023] Open
Abstract
Endocrine disruptors (ED) have been incriminated in the current increase of male reproductive alterations. Bisphenol A (BPA) is a widely used weak estrogenic environmental ED and it is debated whether BPA concentrations within the average internal exposure are toxic. In the present study we investigated the effects of 10(-12) to 10(-5) M BPA concentrations on fetal Leydig cell function, as fetal life is a critical period of sensitivity to ED effects on male reproductive function. To this aim, fetal testes from human at 6.5-10.5 gestational weeks (GW) or from rat and mouse at a comparable critical period of development (14.5 days post-coitum (dpc) for rat and 12.5 dpc for mouse) were explanted and cultured using our validated organotypic culture system in the presence or absence of BPA for 1-3 days. BPA concentrations as low as 10(-8) M reduced testosterone secretion by human testes from day 1 of culture onwards, but not by mouse and rat testes where concentrations equal to 10(-5) M BPA were required. Similarly, 10(-8) M BPA reduced INSL3 mRNA levels only in human cultured testes. On the contrary, 10(-5) and 10(-6) M diethylstilbestrol (DES), a classical estrogenic compound, affected testosterone secretion only in rat and mouse testis cultures, but not in human testis cultures. Lastly, contrarily to the DES effect, the negative effect of BPA on testosterone produced by the mouse fetal testis was maintained after invalidation of estrogen receptor α (ERα). In conclusion, these results evidenced i) a deleterious effect of BPA on fetal Leydig cells function in human for concentrations from 10(-8) M upwards, ii) species-specific differences raising concerns about extrapolation of data from rodent studies to human risk assessment, iii) a specific signaling pathway for BPA which differs from the DES one and which does not involve ERα.
Collapse
Affiliation(s)
- Thierry N'Tumba-Byn
- Université Paris Diderot, Sorbonne Paris Cité, Laboratory of Development of the Gonads, Unit of Stem Cells and Radiation, Fontenay-aux-Roses, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Scott IM, Gagnon N, Lesage L, Philogène BJR, Arnason JT. Efficacy of botanical insecticides from Piper species (Piperaceae) extracts for control of Ruropean chafer (Coleoptera: Scarabaeidae). J Econ Entomol 2005; 98:845-55. [PMID: 16022313 DOI: 10.1603/0022-0493-98.3.845] [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] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Biopesticides, including botanicals, can offer a safe and effective alternative to conventional insecticides for controlling major insect pests within an integrated pest management program. The current study highlights the practical application of a botanical insecticide for controlling a major insect pest of turfgrass: European chafer, Rhizotrogus majalis (Razoumowsky). Greenhouse and field trials were conducted to test the efficacy of a botanical formulation based on black pepper, Piper nigrum L. (Piperaceae), seed extracts to R. majalis larvae. The 7-d P. nigrum extract LC50 for R. majalis third instars was 2.5%. Successful treatment in the field was accomplished with the application of a 2% P. nigrum formulation to turfgrass infested with R. majalis second and third instars, whereas 4% extract was required in a second field trial with older third instars. The 2% pepper extract activity was comparable with the conventional insecticide diazinon in the first field trial. However, the 4% pepper extracts significantly affected the earthworm populations in treated plots compared with diazinon in the second field trail. The analysis of soil residues for piperamides in the P. nigrum extract determined a half-life of 1 - 2.6 d in the first and second field trials, respectively. This confirmed the expectation that under field conditions the residual activity would be less than conventional insecticides, thereby reducing the environmental risk associated with pesticide use. We recommend the pepper formulation for spot treatment applications when population densities reveal an epicenter of infestation rather than broadcasting over large areas, thus helping to minimize cost and negative affects on nontarget invertebrates.
Collapse
Affiliation(s)
- I M Scott
- Department of Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | | | | | | | | |
Collapse
|
7
|
Scott IM, Jensen H, Nicol R, Lesage L, Bradbury R, Sánchez-Vindas P, Poveda L, Arnason JT, Philogène BJR. Efficacy of Piper (Piperaceae) extracts for control of common home and garden insect pests. J Econ Entomol 2004; 97:1390-1403. [PMID: 15384353 DOI: 10.1093/jee/97.4.1390] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Extracts from three species of the plant family Piperaceae, Piper nigrum [L.], Piper guineense [Schum & Thonn, and Piper tuberculatum [Jacq.], were tested for efficacy against insects from five orders. All three species contain isobutyl amides, plant secondary compounds that act as neurotoxins in insects. These materials are considered safe to mammals because Piper spp. were used for centuries for spice and medicinal purposes. When 24-h P. nigrum LC50 values were compared between common insect pests from eastern Canada and the northeastern United States, the most sensitive species in order of increasing lethal concentration were eastern tent caterpillar, Malacosoma americanum (F.) < European pine sawfly larvae, Neodiprion sertifer (Geoffroy) < spindle ermine moth larvae, Yponomeuta cagnagella [Hübner] < viburnum leaf beetle larvae, Pyrrhalta viburni [Paykull] < stripped cucumber beetle adults, Acalymma vittatum (F.) < Colorado potato beetle adults, Leptinotarsa decemlineata (Say) < Japanese beetle adults, Popillia japonica [Newman] < hairy chinch bug, Blissus leucopterus hirtis [Montandon]. The life stage tested was the point at which each species causes the greatest amount of damage to the host plant and the point at which most gardeners would likely choose to treat with a conventional synthetic insecticide. Greenhouse trials revealed that the pepper formulations also had a repellent activity, thus protecting plant leaves from 1) herbivory (lily leaf beetle, Lilioceris lilii [Scopoli], adults and larvae and stripped cucumber beetle adults) and 2) oviposition [European corn borer, Ostrinia nubilalis (Hübner)]. Combinations with other botanical extracts were additive at best in toxicity and repellent trials. Nontarget toxicity to beneficial invertebrates is a possibility because the P. nigrum LC50 for beneficial ladybird beetles was 0.2%. P. nigrum extracts can provide a reasonable level of control against lepidopteran and European pine sawfly larvae and also will work as a short-term repellent and feeding deterrent. It is recommended that the use of Piper extracts be restricted to small-scale spot treatments in residential areas where insect pest outbreaks have occurred.
Collapse
Affiliation(s)
- I M Scott
- Biology Department, University of Ottawa, Ottawa, Ontario, K1N 6N5 Canada
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Thollon C, Bidouard JP, Cambarrat C, Lesage L, Reure H, Delescluse I, Vian J, Peglion JL, Vilaine JP. Stereospecific in vitro and in vivo effects of the new sinus node inhibitor (+)-S 16257. Eur J Pharmacol 1997; 339:43-51. [PMID: 9450615 DOI: 10.1016/s0014-2999(97)01364-2] [Citation(s) in RCA: 64] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The effects of the two isomers, (+)-S 16257 and (-)-S 16260, of a new bradycardic agent, (+/-)-S 15544 (7,8-dimethoxy 3-[3-[[(4.5-dimethoxybenzocyclobutan-1-yl)methyl] methylamino]propyl]1,3,4,5-tetrahydro-2H-3-benzazepin-2-one), were compared in vitro and in vivo on cardiac spontaneous rate and repolarization time. In the isolated rabbit sino-atrial node, the three compounds (3 microM) were equi-effective to reduce the action potential firing rate. In anesthetized pigs, both isomers (0.03, 0.1, 0.3 and 1 mg kg(-1) i.v.) were equipotent to reduce heart rate. For all compounds, the negative chronotropic effect resulted from a reduction in the slope of diastolic depolarization of pacemaker cells. In sino-atrial node cells, (-)-S 16260 (3 microM) increased action potential duration while (+)-S 16257 had a smaller effect. In driven guinea-pig papillary muscles exposed to increasing concentrations of compounds (0.1 to 10 microM) a small prolongation of action potential duration was observed. This prolongation was more marked in rabbit Purkinje fibers stimulated at a low rate. In all cardiac preparations the highest prolongation was observed with (-)-S 16260. In vivo, (-)-S 16260 prolonged QTc at the two highest doses tested while (+)-S 16257 had no effect. In conclusion, resolution of (+/-)-S 15544 into its two enantiomers yielded compounds with the same bradycardic effects. Of the isomers, (+)-S 16257 has an increased specificity with minimal direct effect on action potential repolarization.
Collapse
Affiliation(s)
- C Thollon
- Division pathologies cardiaques et vasculaires, Institut de Recherches Servier, Suresnes, France
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Record E, Lesage L, Cahagnier B, Marion D, Asther M. Filamentous Fungi with High Cytosolic Phospholipid Transfer Activity in the Presence of Exogenous Phospholipid. Appl Environ Microbiol 1994; 60:3390-5. [PMID: 16349388 PMCID: PMC201814 DOI: 10.1128/aem.60.9.3390-3395.1994] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The phospholipid transfer activity of cell extracts from 15 filamentous fungus strains grown on a medium containing phospholipids as the carbon source was measured by a fluorescence assay. This assay was based on the transfer of pyrene-labeled phosphatidylcholines forming the donor vesicles to acceptor vesicles composed of egg phosphatidylcholines. The highest phosphatidylcholine transfer activity was obtained with cell extracts from
Aspergillus oryzae
. The presence of exogenous phospholipids in the culture medium of
A. oryzae
was shown to increase markedly the activity of phospholipid transfer as well as the pool of exocellular proteins during the primary phase of growth. Modifications in the biochemical marker activities of cellular organelles were observed: succinate dehydrogenase, a mitochondrial marker; inosine diphosphatase, a Golgi system marker; and cytochrome
c
oxidoreductase, an endoplasmic reticulum marker, were increased 7.3-, 2-, and 22-fold, respectively, when
A. oryzae
was grown in the presence of phospholipids.
Collapse
Affiliation(s)
- E Record
- Laboratoire de Biotechnologie des Champignons Filamenteux, Institut National de la Recherche Agronomique, Faculté des Sciences de Luminy, 13288 Marseille Cedex 09, France
| | | | | | | | | |
Collapse
|
10
|
Lesage L, Sauvageot F, Voilley A, Lorient D. Influence de la teneur en NaCl et de la durée d'affinage sur les caractéristiques sensorielles d'un fromage type camembert enrichi en magnésium. ACTA ACUST UNITED AC 1992. [DOI: 10.1051/lait:199215] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
11
|
Asther M, Lesage L, Drapron R, Corrieu G, Odier E. Phospholipid and fatty acid enrichment of Phanerochaete chrysosporium INA-12 in relation to ligninase production. Appl Microbiol Biotechnol 1988. [DOI: 10.1007/bf00251775] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|