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Chas M, Boivin L, Arbion F, Jourdan ML, Body G, Ouldamer L. Clinicopathologic predictors of lymph node metastasis in breast cancer patients according to molecular subtype. J Gynecol Obstet Hum Reprod 2018; 47:9-15. [DOI: 10.1016/j.jogoh.2017.10.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 10/23/2017] [Accepted: 10/30/2017] [Indexed: 01/28/2023]
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2
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Miard S, Girard MJ, Joubert P, Carter S, Gonzales A, Guo H, Morpurgo B, Boivin L, Golovko A, Picard F. Absence of Malat1 does not prevent DEN-induced hepatocarcinoma in mice. Oncol Rep 2017; 37:2153-2160. [PMID: 28260109 DOI: 10.3892/or.2017.5468] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 01/12/2017] [Indexed: 11/06/2022] Open
Abstract
Long non-coding RNAs (lncRNA) are key regulators of gene expression both at the transcriptional and post-transcriptional levels. The lncRNA metastasis associated lung adenocarcinoma transcript 1 (Malat1) is overexpressed in many types of cancer, including hepatocarcinoma, and induces cell proliferation in several cell lines in vitro. However, the direct causal effects of Malat1 on hepatocyte proliferation and liver carcinogenesis in vivo are not fully understood. To better determine the contribution of Malat1 to hepatocarcinoma oncogenesis, this study was aimed at testing the hypothesis that its absence confers resistance to the development of liver tumors. Male Malat1-/- mice and their wild-type (WT) littermates were studied one year after treatment with the genotoxic agent diethylnitrosamine (DEN), a potent inducer of liver cancer. As expected, in WT mice, Malat1 expression was significantly higher in hepatic tumors than in healthy liver regions. Altered hepatic mRNA levels of Ki67, HDAC3, NFκB and p27 were observed in DEN-treated Malat1-/- mice. Despite this, these mice were characterized by similar liver weight, prevalence of tumors, and histological features compared to those of their WT littermates. In parallel, plasma lipids and glucose homeostasis did not significantly differ between DEN-treated groups. These findings support a role for Malat1 as a marker of liver carcinogenesis, but also suggest that its role in the regulation of hepatocyte hyperproliferation in mice is either minimal or masked by redundant and/or overwhelming mechanisms.
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Affiliation(s)
- Stéphanie Miard
- Research Center, Quebec Heart and Lung Institute, Laval University, Québec, QC G1V 4G5, Canada
| | - Marie-Josée Girard
- Research Center, Quebec Heart and Lung Institute, Laval University, Québec, QC G1V 4G5, Canada
| | - Philippe Joubert
- Research Center, Quebec Heart and Lung Institute, Laval University, Québec, QC G1V 4G5, Canada
| | - Sophie Carter
- Research Center, Quebec Heart and Lung Institute, Laval University, Québec, QC G1V 4G5, Canada
| | - Amy Gonzales
- Texas A&M Institute for Genomic Medicine, College Station, TX 77843, USA
| | - Huiping Guo
- Texas A&M Institute for Genomic Medicine, College Station, TX 77843, USA
| | - Benjamin Morpurgo
- Texas A&M Institute for Genomic Medicine, College Station, TX 77843, USA
| | - Louise Boivin
- Research Center, Quebec Heart and Lung Institute, Laval University, Québec, QC G1V 4G5, Canada
| | - Andrei Golovko
- Texas A&M Institute for Genomic Medicine, College Station, TX 77843, USA
| | - Frédéric Picard
- Research Center, Quebec Heart and Lung Institute, Laval University, Québec, QC G1V 4G5, Canada
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3
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Fecteau SM, Boivin L, Trudel M, Corbett BA, Harrell FE, Viau R, Champagne N, Picard F. Parenting stress and salivary cortisol in parents of children with autism spectrum disorder: Longitudinal variations in the context of a service dog’s presence in the family. Biol Psychol 2017; 123:187-195. [DOI: 10.1016/j.biopsycho.2016.12.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 12/03/2016] [Accepted: 12/12/2016] [Indexed: 10/20/2022]
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4
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Sallé-Lefort S, Miard S, Nolin MA, Boivin L, Paré MÈ, Debigaré R, Picard F. Hypoxia upregulates Malat1 expression through a CaMKK/AMPK/HIF-1α axis. Int J Oncol 2016; 49:1731-6. [PMID: 27499160 DOI: 10.3892/ijo.2016.3630] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Accepted: 06/17/2016] [Indexed: 11/06/2022] Open
Abstract
Increased expression levels of the long non-coding RNA metastasis-associated lung adenocarcinoma transcript 1 (Malat1) have been associated with enhanced proliferation and metastasis of several cancer cell types. Hypoxia, a hallmark characteristic of solid tumors, has been linked to an increase in the activity of the ATP-generating AMPK protein. Since Malat1 was recently shown to be upregulated during hypoxia, the objective of this study was to determine the contribution of AMPK in the mechanistic pathways regulating Malat1 expression in low oxygen conditions. Compared to those cultured in 21% O2 conditions, HeLa cells incubated in 1.5% O2 expressed more Malat1 transcripts. This observation was mimicked in HEK293T cells using a synthetic reporter construct containing 5.6 kb of the human Malat1 promoter, suggesting that hypoxia directly impacted Malat1 gene transcription. Interestingly, pharmacological stimulation of AMPK increased Malat1 promoter transactivation in 21% O2 conditions, whereas inhibition of either AMPK or its upstream activator CaMKK completely abolished the augmentation of Malat1 under hypoxia. Pharmacological modulation of LKB1, another major regulator of AMPK, had no impact on Malat1 promoter transactivation, suggesting that calcium inputs are important in the control of Malat1 expression by AMPK. Overexpression of hypoxia-inducible factor-1α (HIF-1α) increased Malat1 expression in 21% O2 conditions, whereas pharmacological inhibition of HIF-1α blocked the impact of hypoxia on the Malat1 promoter. Taken together, these findings strongly suggest that Malat1 expression is regulated in hypoxic conditions by a CaMKK/AMPK/HIF-1α axis. More research is needed in physiological settings to test the clinical relevance of this pathway.
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Affiliation(s)
| | - Stéphanie Miard
- IUCPQ Research Center, Quebec Heart and Lung Institute, Québec, Canada
| | | | - Louise Boivin
- IUCPQ Research Center, Quebec Heart and Lung Institute, Québec, Canada
| | - Marie-Ève Paré
- IUCPQ Research Center, Quebec Heart and Lung Institute, Québec, Canada
| | - Richard Debigaré
- IUCPQ Research Center, Quebec Heart and Lung Institute, Québec, Canada
| | - Frédéric Picard
- IUCPQ Research Center, Quebec Heart and Lung Institute, Québec, Canada
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Cisbani G, Drouin-Ouellet J, Gibrat C, Saint-Pierre M, Lagacé M, Badrinarayanan S, Lavallée-Bourget M, Charest J, Chabrat A, Boivin L, Lebel M, Bousquet M, Lévesque M, Cicchetti F. Cystamine/cysteamine rescues the dopaminergic system and shows neurorestorative properties in an animal model of Parkinson's disease. Neurobiol Dis 2015; 82:430-444. [DOI: 10.1016/j.nbd.2015.07.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 07/08/2015] [Accepted: 07/22/2015] [Indexed: 12/22/2022] Open
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6
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Carter S, Miard S, Roy-Bellavance C, Boivin L, Li Z, Pibarot P, Mathieu P, Picard F. Sirt1 inhibits resistin expression in aortic stenosis. PLoS One 2012; 7:e35110. [PMID: 22493735 PMCID: PMC3320872 DOI: 10.1371/journal.pone.0035110] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [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: 10/17/2011] [Accepted: 03/09/2012] [Indexed: 12/17/2022] Open
Abstract
The development of human calcified aortic stenosis (AS) includes age-dependent processes that have been involved in atherosclerosis, such as infiltration of macrophages in aortic valves, which then promote production of many pro-inflammatory cytokines, including resistin. However, the molecular mechanisms contributing to these processes are not established. Since Sirt1 has been shown to modulate macrophage biology and inflammation, we examined its levels in human AS and tested its impact on resistin expression. Sirt1 mRNA (p = 0.01) and protein (p<0.05) levels were reduced in explanted valves from AS patients (n = 51) compared to those from control (n = 11) patients. Sirt1 mRNA levels were negatively associated with resistin mRNA levels quantified in AS valves (p = 0.02). Stimulation of Sirt1 by resveratrol or virus-driven overexpression robustly diminished resistin mRNA and protein expression in macrophages, whereas down-regulation of Sirt1 triggered a large increase in resistin expression. These effects were direct, as chromatin immunoprecipitation assays showed that Sirt1 physically interacted with the resistin promoter region at an AP-1 response element. Moreover, Sirt1 blocked c-jun-induced resistin transactivation in gene reporter assays. These findings demonstrate that, in calcified AS, levels of Sirt1 are reduced whereas those of resistin are increased within aortic valve leaflets. Our results also suggest that this loss of Sirt1 expression alleviates its inhibition of resistin transcription in macrophages. Although the overall contribution of this process to the underlying mechanisms for AS disease development remains unresolved, these observations suggest that modification of Sirt1 expression and/or activity could represent a novel approach against inflammation in AS.
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Affiliation(s)
- Sophie Carter
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
| | - Stéphanie Miard
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
| | | | - Louise Boivin
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
| | - Zhuo Li
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
| | - Philippe Pibarot
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
| | - Patrick Mathieu
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
| | - Frédéric Picard
- Quebec Heart and Lung Research Center, Laval University, Québec, Québec City, Canada
- * E-mail:
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7
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Miard S, Dombrowski L, Carter S, Boivin L, Picard F. Aging alters PPARgamma in rodent and human adipose tissue by modulating the balance in steroid receptor coactivator-1. Aging Cell 2009; 8:449-59. [PMID: 19485965 DOI: 10.1111/j.1474-9726.2009.00490.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Age is an important risk factor for the development of metabolic diseases (e.g. obesity, diabetes and atherosclerosis). Yet, little is known about the molecular mechanisms occurring upon aging that affect energy metabolism. Although visceral white adipose tissue (vWAT) is known for its key impact on metabolism, recent studies have indicated it could also be a key regulator of lifespan, suggesting that it can serve as a node for age-associated fat accretion. Here we show that aging triggers changes in the transcriptional milieu of the nuclear receptor peroxisome proliferator-activated receptor gamma (PPARgamma) in vWAT, which leads to a modified potential for transactivation of target genes upon ligand treatment. We found that in vWAT of mice, rats and men, aging induced a specific decrease in the expression of steroid receptor coactivator-1 (SRC-1), whose recruitment to PPARgamma is associated with improved insulin sensitivity and low adipogenic activity. In contrast, aging and oxidative stress did not impact on PPARgamma expression and PPARgamma ligand production. Age-induced loss of PPARgamma/SRC-1 interactions increased the binding of PPARgamma to the promoter of the adipogenic gene aP2. These findings suggest that strategies aimed at increasing SRC-1 expression and recruitment to PPARgamma upon aging might help improve age-associated metabolic disorders.
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Affiliation(s)
- Stéphanie Miard
- Laval Hospital Research Center, Laval University, Québec, QC, Canada
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8
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Sabatier A, Dourlhes N, Boivin L, Petitpas S, Robert P. 641 Complications vitréo-rétiniennes sous Buprénorphine intra-veineuse (Subutex®). J Fr Ophtalmol 2008. [DOI: 10.1016/s0181-5512(08)71240-3] [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: 11/26/2022]
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Abstract
We demonstrate tomographic T-ray imaging, using the timing information present in terahertz (THz) pulses in a reflection geometry. THz pulses are reflected from refractive-index discontinuities inside an object, and the time delays of these pulses are used to determine the positions of the discontinuities along the propagation direction. In this fashion a tomographic image can be constructed.
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Abstract
We show that an intense linearly polarized pulse propagating in a nonbirefringent fiber squeezes the perpendicularly polarized vacuum f luctuations through cross-phase modulation. Unlike the generation of squeezed vacuum through self-phase modulation, the mechanism discussed here does not require the use of a nonlinear Sagnac interferometer to separate the pump from the squeezed vacuum.
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11
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Kärtner FX, Boivin L. Quantum noise of the fundamental soliton. Phys Rev A 1996; 53:454-466. [PMID: 9912902 DOI: 10.1103/physreva.53.454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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12
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Boivin L. Sagnac-loop squeezer at zero dispersion with a response time for the Kerr nonlinearity. Phys Rev A 1995; 52:754-766. [PMID: 9912300 DOI: 10.1103/physreva.52.754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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13
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Abstract
The continuous-time quantum theory of self-phase modulation (SPM) in lossless, dispersionless, single-mode fiber requires a nonzero response time, to capture the classical SPM limit properly, and an accompanying Raman noise, to ensure commutator preservation. The continuous-wave, four-wave mixing limit of this theory is shown to harbor a Raman-noise limit on fiber-based squeezed-state generation.
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Boivin L, Kärtner FX, Haus HA. Analytical solution to the quantum field theory of self-phase modulation with a finite response time. Phys Rev Lett 1994; 73:240-243. [PMID: 10057120 DOI: 10.1103/physrevlett.73.240] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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15
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Massicotte D, Péronnet F, Brisson G, Boivin L, Hillaire-Marcel C. Oxidation of exogenous carbohydrate during prolonged exercise in fed and fasted conditions. Int J Sports Med 1990; 11:253-8. [PMID: 2228353 DOI: 10.1055/s-2007-1024802] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The oxidation of glucose and fructose ingested during moderate exercise performed on a cycle ergometer (120 min, 52% VO2max) was compared in ten young males fasted (n = 5) or fed (n = 5) before exercise. The subjects ingested randomly 1.33 g/kg body weight (approximately 96 +/- 9 g) of either enriched 13C-glucose (G), 13C-fructose (F), or water only (W); the solutions were evenly distributed over the exercise period. The fasted subjects began the three exercises with a lower blood glucose (P less than or equal to 0.05 for F only) and insulin (P less than or equal to 0.05) levels and a higher free fatty acid (FFA) concentration (P less than or equal to 0.05) than the fed ones. Throughout the exercise period, blood glucose level was maintained in fasted as well as in fed group for G and F ingestions, while it decreased (P less than or equal to 0.05 at the 100th min in fasted subjects) with water ingestion. Insulin level was similar in both fed and fasted conditions with F and W ingestions and lower than G trials for the fed subjects. For the three ingestions, FFA was lower (P less than or equal to 0.05) in the fasted than in the fed group over the exercise period. Over the 2-h period of exercise, a greater (P less than or equal to 0.05) amount of exogenous F was oxidized in the fasted (49 +/- 6 g) than in the fed (36 +/- 5 g) group, which represent 31% and 20% of the total carbohydrate energy supply, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D Massicotte
- Département de Kinanthropologie, Université du Québec à Montréal, Canada
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