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Chemli J, Drira C, Felfel H, Roudijk B, Al Sayah F, Kouki M, Kooli A, Razgallah Khrouf M. Valuing health-related quality of life using a hybrid approach: Tunisian value set for the EQ-5D-3L. Qual Life Res 2021; 30:1445-1455. [PMID: 33447958 PMCID: PMC8068700 DOI: 10.1007/s11136-020-02730-z] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/02/2020] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To develop a value set for EQ-5D-3L based on the societal preferences of the Tunisian population. METHODS A representative sample of the Tunisian general population was obtained through multistage quota sampling involving age, gender and region. Participants (n = 327), aged above 20 years, were interviewed using the EuroQol Portable Valuation Technology in face-to-face computer-assisted interviews. Participants completed 10 composite time trade-off (cTTO) and 10 discrete choice experiments (DCE) tasks. Utility values for the EQ-5D-3L health states were estimated using regression modeling. The cTTO and DCE data were analyzed using linear and conditional logistic regression modeling, respectively. Multiple hybrid models were computed to analyze the combined data and were compared on goodness of fit measured by the Akaike information criterion (AIC). RESULTS A total of 300 participants with complete data that met quality criteria were included. All regression models showed both logical consistency and significance with respect to the parameter estimates. A hybrid model accounting for heteroscedasticity presented the lowest value for the AIC among the hybrid models. Hence, it was used to construct the Tunisian EQ-5D-3L valuation set with a range of predicted values from - 0.796 to 1.0. CONCLUSION This study provides utility values for EQ-5D-3L health states for the Tunisian population. This value set will be used in economic evaluations of health technologies and for Tunisian health policy decision-making.
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Affiliation(s)
- Jaafar Chemli
- Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia.
| | - Chema Drira
- Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
| | - Hajer Felfel
- Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
| | - Bram Roudijk
- EuroQol Research Foundation, Rotterdam, Netherlands
| | - Fatima Al Sayah
- School of Public Health, University of Alberta, Edmonton, AB, Canada
| | - Mokhtar Kouki
- High School of Statistics and Information Analysis, University of Carthage, Tunis, Tunisia
| | | | - Myriam Razgallah Khrouf
- Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
- Quality and Research, Tunis, Tunisia
- Pharmacy and Drug Department, Ministry of Health, Tunis, Tunisia
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Bakkour N, Samp J, Akhras K, El Hammi E, Soussi I, Zahra F, Duru G, Kooli A, Toumi M. Systematic review of appropriate cognitive assessment instruments used in clinical trials of schizophrenia, major depressive disorder and bipolar disorder. Psychiatry Res 2014; 216:291-302. [PMID: 24656516 DOI: 10.1016/j.psychres.2014.02.014] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 02/03/2014] [Accepted: 02/09/2014] [Indexed: 12/01/2022]
Abstract
Cognitive dysfunction is increasingly recognized as a symptom in mental conditions including schizophrenia, major depressive disorder (MDD), and bipolar disorder (BPD). Despite the many available cognitive assessment instruments, consensus is lacking on their appropriate use in clinical trials. We conducted a systematic literature review in Embase, PubMed/Medline and PsychINFO to identify appropriate cognitive function instruments for use in clinical trials of schizophrenia, MDD, and BPD. Instruments were identified from the articles. Instruments and articles were excluded if they did not address schizophrenia, MDD, or BPD. Instrument appropriateness was further assessed by the criteria of the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) initiative: test-retest reliability, utility, relationship to functional status, potential changeability to pharmacological agents, and tolerability and practicality for clinical trials. The database search yielded 173 articles describing 150 instruments used to assess cognitive function. Seventeen additional instruments were identified through Google and clinicaltrials.gov. Among all these, only 30 (18%) were deemed appropriate for use in the diseases of interest. Of these, 27 were studied in schizophrenia, one in MDD and two in BPD. These findings suggest the need for careful selection of appropriate cognitive assessment instruments, as not all may be valid in these disorders.
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Affiliation(s)
- Nadia Bakkour
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Jennifer Samp
- Takeda Pharmaceuticals International, One Takeda Parkway, Deerfield, IL, USA
| | - Kasem Akhras
- Takeda Pharmaceuticals International, One Takeda Parkway, Deerfield, IL, USA
| | - Emna El Hammi
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Imen Soussi
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Fatma Zahra
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Gérard Duru
- University of Lyon, University Claude Bernard Lyon I, UFR d׳Odontologie, 11 rue Guillaume Paradin, 69372 Lyon, Cedex 08, France
| | - Amna Kooli
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Mondher Toumi
- University of Lyon, University Claude Bernard Lyon I, UFR d׳Odontologie, 11 rue Guillaume Paradin, 69372 Lyon, Cedex 08, France.
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El Hammi E, Samp J, Rémuzat C, Auray JP, Lamure M, Aballéa S, Kooli A, Akhras K, Toumi M. Difference of perceptions and evaluation of cognitive dysfunction in major depressive disorder patients across psychiatrists internationally. Ther Adv Psychopharmacol 2014; 4:22-9. [PMID: 24490027 PMCID: PMC3896134 DOI: 10.1177/2045125313507946] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Many studies have suggested that major depressive disorder (MDD) is often associated with cognitive dysfunction. Despite this, guidance addressing assessment of cognitive dysfunction in MDD is lacking. The aim of this study was to examine psychiatrists' perceptions and evaluation of cognitive dysfunction in routine practice in MDD patients across different countries. METHOD A total of 61 psychiatrists in the US, Germany, France, Spain, Hong Kong, and Australia participated in an online survey about perceptions of cognitive dysfunction in MDD patients, evaluation of cognition and instruments used in cognitive evaluation. RESULTS Most psychiatrists reportedly relied on patient history interviews for cognitive evaluation (83% in France and approximately 60% in the USA, Germany, Australia and Hong Kong). The remainder used a cognitive instrument or a combination of cognitive instrument and patient history interview for assessment. Of those using instruments for cognitive assessment, only nine named instruments that were appropriate for cognitive evaluation. The remainder reported other clinical measures not intended for cognitive evaluation. CONCLUSIONS Overall, psychiatrists in routine clinical practice value the assessment of cognitive in MDD. However, there is a lack of standardization in these assessments and misconceptions regarding proper assessment.
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Affiliation(s)
| | - Jennifer Samp
- Takeda Global Research and Development Center, Deerfield, IL, USA
| | | | - Jean-Paul Auray
- University of Lyon, University Claude Bernard Lyon I, Lyon, Cedex, France
| | - Michel Lamure
- University of Lyon, University Claude Bernard Lyon I, Lyon, Cedex, France
| | | | | | - Kasem Akhras
- Takeda Global Research and Development Center, Deerfield, IL, USA
| | - Mondher Toumi
- University of Lyon, University Claude Bernard Lyon I, UFR d'Odontologie, 11 rue Guillaume Paradin, 69372 Lyon, Cedex 08, France
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4
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Belgaied W, Samp J, Vimont A, Rémuzat C, Aballéa S, El Hammi E, Kooli A, Toumi M, Akhras K. Routine clinical assessment of cognitive functioning in schizophrenia, major depressive disorder, and bipolar disorder. Eur Neuropsychopharmacol 2014; 24:133-41. [PMID: 24314852 DOI: 10.1016/j.euroneuro.2013.11.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 10/31/2013] [Accepted: 11/01/2013] [Indexed: 01/04/2023]
Abstract
As more evidence points to the association of cognitive dysfunction with mental health disorders, the assessment of cognitive function in routine clinical care of these disorders is increasingly important. Despite this, it remains unknown how cognitive function is measured in routine clinical practice. The objective of this study was to assess psychiatrists' awareness of cognitive dysfunction in mental health disorders and their methods of cognitive assessment. An online survey was disseminated to psychiatrists in Europe, Asia, Australia and the United States. The survey asked about their perceptions of cognitive dysfunction in several mental health disorders, knowledge of cognitive assessment, method of cognitive assessment, and instruments used to measure cognitive function. Among the 61 respondents, most perceived that schizophrenia was associated with the greatest cognitive dysfunction. Many were unaware whether guidelines were available on cognitive assessment. In schizophrenia, 59% of psychiatrists reportedly used cognitive instruments, while the remainder relied solely on patient history interviews. The use of instruments to assess cognition in major depressive disorder (MDD) and bipolar disorder (BPD) was lower, 38% and 37% respectively. Of the reported instruments used, only a few were actually appropriate for use in the diseases of interest (12% in schizophrenia, 3% in MDD and 0% in BPD). Other instruments reported were clinical measures that did not assess cognition. These findings reveal some inconsistencies in psychiatrists' routine clinical evaluation of cognitive function. There appeared to be low use of true cognitive assessment instruments in clinical practice and confusion regarding what constituted a cognitive assessment instrument.
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Affiliation(s)
- Wael Belgaied
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Jennifer Samp
- Takeda Pharmaceuticals International, Inc. Deerfield, IL, USA
| | | | - Cécile Rémuzat
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Samuel Aballéa
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Emna El Hammi
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Amna Kooli
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA
| | - Mondher Toumi
- Creativ-Ceutical, 500 Lake Cook Road #350, Deerfield, IL, USA; University of Lyon, University Claude Bernard Lyon I, UFR d'Odontologie, 11 rue Guillaume Paradin, 69372 Lyon, Cedex 08, France.
| | - Kasem Akhras
- Takeda Pharmaceuticals International, Inc. Deerfield, IL, USA
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Honoré JC, Kooli A, Hamel D, Alquier T, Rivera JC, Quiniou C, Hou X, Kermorvant-Duchemin E, Hardy P, Poitout V, Chemtob S. Fatty acid receptor Gpr40 mediates neuromicrovascular degeneration induced by transarachidonic acids in rodents. Arterioscler Thromb Vasc Biol 2013; 33:954-61. [PMID: 23520164 DOI: 10.1161/atvbaha.112.300943] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Nitro-oxidative stress exerts a significant role in the genesis of hypoxic-ischemic (HI) brain injury. We previously reported that the ω-6 long chain fatty acids, transarachidonic acids (TAAs), which are nitrative stress-induced nonenzymatically generated arachidonic acid derivatives, trigger selective microvascular endothelial cell death in neonatal neural tissue. The primary molecular target of TAAs remains unidentified. GPR40 is a G protein-coupled receptor activated by long chain fatty acids, including ω-6; it is highly expressed in brain, but its functions in this tissue are largely unknown. We hypothesized that TAAs play a significant role in neonatal HI-induced cerebral microvascular degeneration through GPR40 activation. APPROACH AND RESULTS Within 24 hours of a HI insult to postnatal day 7 rat pups, a cerebral infarct and a 40% decrease in cerebrovascular density was observed. These effects were associated with an increase in nitrative stress markers (3-nitrotyrosine immunoreactivity and TAA levels) and were reduced by treatment with nitric oxide synthase inhibitor. GPR40 was expressed in rat pup brain microvasculature. In vitro, in GPR40-expressing human embryonic kidney (HEK)-293 cells, [(14)C]-14E-AA (radiolabeled TAA) bound specifically, and TAA induced calcium transients, extracellular signal-regulated kinase 1/2 phosphorylation, and proapoptotic thrombospondin-1 expression. In vivo, intracerebroventricular injection of TAAs triggered thrombospondin-1 expression and cerebral microvascular degeneration in wild-type mice, but not in GPR40-null congeners. Additionally, HI-induced neurovascular degeneration and cerebral infarct were decreased in GPR40-null mice. CONCLUSIONS GPR40 emerges as the first identified G protein-coupled receptor conveying actions of nonenzymatically generated nitro-oxidative products, specifically TAAs, and is involved in (neonatal) HI encephalopathy.
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Affiliation(s)
- Jean-Claude Honoré
- Department of Pediatrics, Research Center-CHU Ste-Justine, Montréal, Quebec, Canada
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Honoré JC, Kooli A, Hou X, Hamel D, Rivera JC, Picard É, Hardy P, Tremblay S, Varma DR, Jankov RP, Mancini JA, Balazy M, Chemtob S. Sustained hypercapnia induces cerebral microvascular degeneration in the immature brain through induction of nitrative stress. Am J Physiol Regul Integr Comp Physiol 2010; 298:R1522-30. [DOI: 10.1152/ajpregu.00807.2009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Hypercapnia is regularly observed in chronic lung disease, such as bronchopulmonary dysplasia in preterm infants. Hypercapnia results in increased nitric oxide synthase activity and in vitro formation of nitrates. Neural vasculature of the immature subject is particularly sensitive to nitrative stress. We investigated whether exposure to clinically relevant sustained high CO2 causes microvascular degeneration in the newborn brain by inducing nitrative stress, and whether this microvascular degeneration has an impact on brain growth. Newborn rat pups were exposed to 10% CO2 as inspired gas (PaCO2 = 60–70 mmHg) starting within 24 h of birth until postnatal day 7 (P7). Brains were notably collected at different time points to measure vascular density, determine brain cortical nitrite/nitrate, and trans-arachidonic acids (TAAs; products of nitration) levels as effectors of vessel damage. Chronic exposure of rat pups to high CO2 (PaCO2 ≈ 65 mmHg) induced a 20% loss in cerebrovascular density at P3 and a 15% decrease in brain mass at P7; at P30, brain mass remained lower in CO2-exposed animals. Within 24 h of exposure to CO2, brain eNOS expression and production of nitrite/nitrate doubled, lipid nitration products (TAAs) increased, and protein nitration (3-nitrotyrosine immunoreactivity) was also coincidently augmented on brain microvessels (lectin positive). Intracerebroventricular injection of TAAs (10 μM) replicated cerebrovascular degeneration. Treatment of rat pups with NOS inhibitor (l-Nω-nitroarginine methyl ester) or a peroxynitrite decomposition catalyst (FeTPPS) prevented hypercapnia-induced microvascular degeneration and preserved brain mass. Cytotoxic effects of high CO2 were reproduced in vitro /ex vivo on cultured endothelial cells and sprouting microvessels. In summary, hypercapnia at values frequently observed in preterm infants with chronic lung disease results in increased nitrative stress, which leads to cerebral cortical microvascular degeneration and curtails brain growth.
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Affiliation(s)
- Jean-Claude Honoré
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Amna Kooli
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada
| | - Xin Hou
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
| | - David Hamel
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - José Carlos Rivera
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Émilie Picard
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Pierre Hardy
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Sophie Tremblay
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
| | - Daya R. Varma
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada
| | - Robert P. Jankov
- Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada; and
| | - Joseph A. Mancini
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
| | - Michael Balazy
- Department of Pathology, New York Medical College, New York, New York
| | - Sylvain Chemtob
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada
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Kooli A, Kermorvant-Duchemin E, Sennlaub F, Bossolasco M, Hou X, Honoré JC, Dennery PA, Sapieha P, Varma D, Lachapelle P, Zhu T, Tremblay S, Hardy P, Jain K, Balazy M, Chemtob S. trans-Arachidonic acids induce a heme oxygenase-dependent vasorelaxation of cerebral microvasculature. Free Radic Biol Med 2008; 44:815-25. [PMID: 18082639 DOI: 10.1016/j.freeradbiomed.2007.11.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2007] [Revised: 10/24/2007] [Accepted: 11/07/2007] [Indexed: 10/22/2022]
Abstract
Nitrative stress is an important regulator of vascular tone. We have recently described that trans-arachidonic acids (TAA) are major products of NO(2)(.)-mediated isomerization of arachidonic acid in cell membranes and that nitrative stress increases TAA levels leading to neural microvascular degeneration. In the present study, we explored whether TAA exert acute effects on neuromicrovascular tone and investigated potential mechanisms thereof. TAA induced an endothelium-dependent vasorelaxation of rat brain pial microvasculature. This vasorelaxation was independent of nitric oxide, prostanoids, lipoxygenase products, and CYP(450) metabolite trans-hydroxyeicosatetraenoic acids. However, inhibition of heme oxygenase (using zinc protoporphyrin IX) and of dependent soluble guanylate cyclase (sGC; using ODQ) significantly diminished (by approximately 70%) the TAA-induced vasorelaxation. Consistent with these findings, TAA stimulated heme oxygenase (HO)-2-dependent bilirubin (using siRNA HO-2) and cGMP formation, and the HO product carbon monoxide (using CO-releasing CORM-2) reproduced the sGC-dependent cGMP formation and vasorelaxation. Further exploration revealed that TAA-induced vasorelaxation and bilirubin formation (HO activation) were nearly abrogated by large-conductance calcium-dependent potassium channels (BK(Ca)) (using TEA and iberiotoxin). Opening of BK(Ca) with the selective activator NS1619 induced a concentration-dependent vasorelaxation, which was inhibited by HO and sGC inhibitors. Coimmunoprecipitation suggested a molecular complex interaction between BK(Ca) and HO-2 (but not HO-1). Collectively, these findings identify new properties of TAA, specifically cerebral vasorelaxation through interactive activation of BK(Ca) with HO-2 and, in turn, sGC. Our findings provide new insights into the characterization of nitrative stress-derived TAA products, by showing they can act as acute mediators of nitrative stress on neurovascular tone.
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Affiliation(s)
- Amna Kooli
- Department of Paediatrics, Research Center of Hôpital Ste-Justine, Montréal, Quebec, Canada
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8
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Brault S, Gobeil F, Fortier A, Honoré JC, Joyal JS, Sapieha PS, Kooli A, Martin E, Hardy P, Ribeiro-da-Silva A, Peri K, Lachapelle P, Varma D, Chemtob S. Lysophosphatidic acid induces endothelial cell death by modulating the redox environment. Am J Physiol Regul Integr Comp Physiol 2006; 292:R1174-83. [PMID: 17122328 DOI: 10.1152/ajpregu.00619.2006] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [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: 01/01/2023]
Abstract
Oxidant stress plays a significant role in hypoxic-ischemic injury to the susceptible microvascular endothelial cells. During oxidant stress, lysophosphatidic acid (LPA) concentrations increase. We explored whether LPA caused cytotoxicity to neuromicrovascular cells and the potential mechanisms thereof. LPA caused a dose-dependent death of porcine cerebral microvascular as well as human umbilical vein endothelial cells; cell death appeared oncotic rather than apoptotic. LPA-induced cell death was mediated via LPA(1) receptor, because the specific LPA(1) receptor antagonist THG1603 fully abrogated LPA's effects. LPA decreased intracellular GSH levels and induced a p38 MAPK/JNK-dependent inducible nitric oxide synthase (NOS) expression. Pretreatment with the antioxidant GSH precursor N-acetyl-cysteine (NAC), as well as with inhibitors of NOS [N(omega)-nitro-l-arginine (l-NNA); 1400W], significantly prevented LPA-induced endothelial cell death (in vitro) to comparable extents; as expected, p38 MAPK (SB203580) and JNK (SP-600125) inhibitors also diminished cell death. LPA did not increase indexes of oxidation (isoprostanes, hydroperoxides, and protein nitration) but did augment protein nitrosylation. Endothelial cytotoxicity by LPA in vitro was reproduced ex vivo in brain and in vivo in retina; THG1603, NAC, l-NNA, and combined SB-203580 and SP600125 prevented the microvascular rarefaction. Data implicate novel properties for LPA as a modulator of the cell redox environment, which partakes in endothelial cell death and ensued neuromicrovascular rarefaction.
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Affiliation(s)
- Sonia Brault
- Department of Pediatrics, Research Center, Hôpital Sainte-Justine, 3175 Côte Sainte-Catherine, Montréal, Québec, Canada H3T 1C5
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9
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Leduc M, Kermorvant-Duchemin E, Checchin D, Sennlaub F, Sirinyan M, Kooli A, Lachapelle P, Chemtob S. Hypercapnia- and trans-arachidonic acid-induced retinal microvascular degeneration: implications in the genesis of retinopathy of prematurity. Semin Perinatol 2006; 30:129-38. [PMID: 16813971 DOI: 10.1053/j.semperi.2006.04.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [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: 11/11/2022]
Abstract
High oxygen tension is a major factor in the genesis of retinopathy of prematurity (ROP). However, clinical and experimental evidence suggests a significant role for high carbon dioxide (CO(2)) tension as well. Along these lines, although ischemia is often considered to be synonymous with an oxygen deficit, it is also associated with a concomitant local elevation of CO(2) that can lead to impaired developmental and ischemic neovascularization. The mechanisms by which hypercapnia induces retinal microvascular degeneration, a critical step which precedes the subsequent proliferative preretinal neovascularization, are not known. Nitrative stress has an important role in microvascular degeneration leading to ischemia in conditions such as ROP. Hypercapnia is a facilitator of nitration in vitro. We hereby present evidence that prolonged exposure to CO(2) impairs developmental retinal neovascularization through a mechanism involving increased endothelial nitric oxide synthase and induction of a nitrative stress; effects of hypercapnia are independent of its hyperaemic effects. Moreover, we demonstrate that an in vivo nitrative stress associated with retinal vasoobliteration results in nitration of arachidonic acids into trans-arachidonic acids (TAAs), which can act as mediators of nitrative stress by causing microvascular degeneration by inducing expression of the antiangiogenic factor thrombospondin-1. These recent findings establish a previously unexplored means by which hypercapnia hinders efficient neovascularization and provide new insight into the molecular mechanisms of nitrative stress on microvascular injury involving TAA, and suggest new therapeutic avenues in the management of nitrative stress disorders such as in ischemic retinopathies (of prematurity and of diabetes) and encephalopathies.
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Affiliation(s)
- Martin Leduc
- Department of Pediatrics, Ophthalmology and Pharmacology, Research Center, Hôpital Ste-Justine, 3175 Ch. Côte-Sainte-Catherine, Montréal, Québec, Canada
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10
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Kermorvant-Duchemin E, Sennlaub F, Sirinyan M, Brault S, Andelfinger G, Kooli A, Germain S, Ong H, D'Orleans-Juste P, Gobeil F, Zhu T, Boisvert C, Hardy P, Jain K, Falck J, Balazy M, Chemtob S. Trans-arachidonic acids generated during nitrative stress induce a thrombospondin-1-dependent microvascular degeneration. Nat Med 2005; 11:1339-45. [PMID: 16311602 PMCID: PMC4850227 DOI: 10.1038/nm1336] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2005] [Accepted: 11/01/2005] [Indexed: 12/17/2022]
Abstract
Nitrative stress has an important role in microvascular degeneration leading to ischemia in conditions such as diabetic retinopathy and retinopathy of prematurity. Thus far, mediators of nitrative stress have been poorly characterized. We recently described that trans-arachidonic acids are major products of NO(2)(*)-mediated isomerization of arachidonic acid within the cell membrane, but their biological relevance is unknown. Here we show that trans-arachidonic acids are generated in a model of retinal microangiopathy in vivo in a NO(*)-dependent manner. They induce a selective time- and concentration-dependent apoptosis of microvascular endothelial cells in vitro, and result in retinal microvascular degeneration ex vivo and in vivo. These effects are mediated by an upregulation of the antiangiogenic factor thrombospondin-1, independently of classical arachidonic acid metabolism. Our findings provide new insight into the molecular mechanisms of nitrative stress in microvascular injury and suggest new therapeutic avenues in the management of disorders involving nitrative stress, such as ischemic retinopathies and encephalopathies.
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Affiliation(s)
| | - Florian Sennlaub
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
- Physiopathologie des Maladies Oculaires : Innovations Thérapeutiques
InsermIFR58Université Pierre et Marie Curie - Paris 6Institut Biomédical Des Cordeliers 15 Rue de L'Ecole de Médecine 75270 Paris Cedex 06
- * Correspondence should be addressed to Florian Sennlaub
| | - Mirna Sirinyan
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
- Department of Pharmacology and Therapeutics
McGill University [Montreal]Montréal, Québec
| | - Sonia Brault
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
- Department of Pharmacology and Therapeutics
McGill University [Montreal]Montréal, Québec
| | - Gregor Andelfinger
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
| | - Amna Kooli
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
- Department of Pharmacology and Therapeutics
McGill University [Montreal]Montréal, Québec
| | - Stéphane Germain
- Pathologie Vasculaire et Endocrinologie Rénale
InsermCollège de FranceCollège de France 11 Place Marcelin Berthelot 75231 Paris Cedex 05
| | - Huy Ong
- Faculty of Pharmacy
Université de MontréalMontréal Québec
| | | | - Fernand Gobeil
- Department of Pharmacology
Université de SherbrookeQuebec
| | - Tang Zhu
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
| | - Chantal Boisvert
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
| | - Pierre Hardy
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
| | - Kavita Jain
- Department of Pharmacology
New York Medical CollegeNew York
| | - John Falck
- Department of Biochemistry
University of Texas
| | - Michael Balazy
- Department of Pharmacology
New York Medical CollegeNew York
| | - Sylvain Chemtob
- Department of Pediatrics, Ophthalmology and Pharmacology
Hôpital Sainte-JustineMontréal, Québec
- Department of Pharmacology and Therapeutics
McGill University [Montreal]Montréal, Québec
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Quiniou C, Sennlaub F, Beauchamp MH, Checchin D, Lahaie I, Brault S, Gobeil F, Sirinyan M, Kooli A, Hardy P, Pshezhetsky A, Chemtob S. Dominant Role for Calpain in Thromboxane-Induced Neuromicrovascular Endothelial Cytotoxicity. J Pharmacol Exp Ther 2005; 316:618-27. [PMID: 16214879 DOI: 10.1124/jpet.105.093898] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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: 11/22/2022] Open
Abstract
Thromboxane A(2) (TXA(2)) is an important lipid mediator generated during oxidative stress and implicated in ischemic neural injury. This autacoid was recently shown to partake in this injury process by directly inducing endothelial cytotoxicity. We explored the mechanisms for this TXA(2)-evoked neural microvascular endothelial cell death. Stable TXA(2) mimetics 5-heptenoic acid, 7-[6-(3-hydroxy-1-octenyl)-2-oxabicyclo[2.2.1]hept-5-yl]-[1R-[1alpha,4alpha,5beta(Z),6alpha,(1E,3S)]]-9,11-dedioxy-9alpha,11alpha-methanolpoxy (U-46619) [as well as [1S-[1alpha,2alpha(Z),3beta(1E,3S(*)),4alpha]]-7-[3-[3-hydroxy-4-(4-iodophenoxy)-1-butenyl]-7-oxabicyclo[2.1.1]-hept-2-yl]-5-heptenoic acid; I-BOP] induced a retinal microvascular degeneration in rat pups in vivo and in porcine retinal explants ex vivo and death of porcine brain endothelial cells (in culture). TXA(2) dependence of these effects was corroborated by antagonism using the selective TXA(2) receptor blocker (-)-6,8-difluoro-9-p-methyl-sulfonyl-benzyl-1,2,3,4-tetrahydrocarbazol-1-yl-acetic acid (L670596). In all cases, neurovascular endothelial cell death was prevented by pan-calpain and specific m-calpain inhibitors but not by caspase-3 or pan-caspase inhibitors. Correspondingly, TXA(2) (mimetics) augmented generation of known active m-calpain (but not mu-calpain) form and increased the activity of m-calpain (cleavage of fluorogenic substrate N-succinyl-Leu-Leu-Val-Tyr-7-amino-4-methylcoumarin; and of alpha-spectrin into specific fragments) but not of pan-caspase or specific caspase-3 (respectively, using sulforhodamine-Val-Arg-Asp-fluoromethyl ketone and detecting its active 17- and 12-kDa fragments). Interestingly, these effects were phospholipase C (PLC)-dependent [associated with increase in inositol triphosphate and inhibited by PLC blocker 1-[6-[[17beta-methoxyestra-1,3,5(10)-trien-17-yl]amino]hexyl]-1H-pyrrole-2,5-dione (U73122)] and required calcium but were not associated with increased intracellular calcium. U-46619-induced calpain activation resulted in translocation of Bax to the mitochondria, loss of polarization of the latter (using potentiometric probe 5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolyl-carbocyanine iodide; JC-1) and in turn release of cytochrome c into the cytosol and depletion of cellular ATP; these effects were all blocked by calpain inhibitors. Overall, this work identifies (specifically) m-calpain as a dominant protease in TXA(2)-induced neurovascular endothelial cell death.
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Affiliation(s)
- Christiane Quiniou
- Department of Pediatrics, Centre de Recherche de l'Hôpital Ste-Justine, Université de Montréal, Québec, Canada
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