1
|
Zubillaga M, Tau J, Rosa D, Bellini MJ, Arnal N. Sex-dependent effect of sublethal copper concentrations on de novo cholesterol synthesis in astrocytes and their possible links to variations in cholesterol and amyloid precursor protein levels in neuronal membranes. Biol Sex Differ 2024; 15:4. [PMID: 38191520 PMCID: PMC10775608 DOI: 10.1186/s13293-023-00578-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 12/21/2023] [Indexed: 01/10/2024] Open
Abstract
BACKGROUND Cholesterol (Cho) is an essential lipophilic molecule in cells; however, both its decrease and its increase may favor the development of neurological diseases such as Alzheimer's disease (AD). Although copper (Cu) is an essential trace metal for cells, the increased plasma concentration of its free form has been linked with AD development and severity. AD affects aged people, but its prevalence and severity are higher in women than in men. We have previously shown that Cu promotes Cho de novo synthesis in immature neurons as well as increased Cho in membrane rafts and Aβ levels in culture medium, but there are no results yet regarding sex differences in the effects of sublethal Cu exposure on Cho de novo synthesis. METHODS We examined the potential sex-specific impact of sublethal Cu concentrations on de novo Cho synthesis in primary cultures of male and female astrocytes. We also explored whether this had any correlation with variations in Cho and APP levels within neuronal membrane rafts. RESULTS Flow cytometry analysis demonstrated that Cu treatment leads to a greater increase in ROS levels in female astrocytes than in males. Furthermore, through RT-PCR analysis, we observed an upregulation of SREBP-2 and HMGCR. Consistently, we observed an increase in de novo Cho synthesis. Finally, western blot analysis indicated that the levels of ABCA1 increase after Cu treatment, accompanied by a higher release of radiolabeled Cho and an elevation in Cho and APP levels in neuronal membrane rafts. Importantly, all these results were significantly more pronounced in female astrocytes than in males. CONCLUSIONS Our findings confirm that Cu stimulates Cho synthesis in astrocytes, both in a ROS-dependent and -independent manner. Moreover, female astrocytes displayed elevated levels of HMGCR, and de novo Cho synthesis compared to males following TBH and Cu treatments. This corresponds with higher levels of Cho released into the culture medium and a more significant Cho and APP rise within neuronal rafts. We consider that the increased risk of AD in females partly arises from sex-specific responses to metals and/or exogenous substances, impacting key enzyme regulation in various biochemical pathways, including HMGCR.
Collapse
Affiliation(s)
- Marlene Zubillaga
- Laboratorio de Neurociencia, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina
| | - Julia Tau
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina
| | - Diana Rosa
- Laboratorio de Nutrición Mineral, Fac. Cs Veterinarias, UNLP (Universidad Nacional de La Plata), Calle 60, CP 1900, La Plata, Argentina
| | - M José Bellini
- Laboratorio de Neurobiología y Cognición en el Envejecimiento y Enfermedades Neurodegenerativas, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina
| | - Nathalie Arnal
- Laboratorio de Neurociencia, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina.
| |
Collapse
|
2
|
Zubillaga M, Rosa D, Astiz M, Tricerri MA, Arnal N. Effect of Sublethal Copper Overload on Cholesterol De Novo Synthesis in Undifferentiated Neuronal Cells. ACS Omega 2022; 7:25022-25030. [PMID: 35910134 PMCID: PMC9330139 DOI: 10.1021/acsomega.2c00703] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
Although copper (Cu) is an essential trace metal for cells, it can induce harmful effects as it participates in the Fenton reaction. Involuntary exposure to Cu overload is much more common than expected and has been linked with neurodegeneration, particularly with Alzheimer's disease (AD) evidenced by a positive correlation between free Cu in plasma and the severity of the disease. It has been suggested that Cu imbalance alters cholesterol (Chol) homeostasis and that high membrane Chol promotes the amyloidogenic processing of the amyloid precursor protein (APP) secreting the β-amyloid (Aβ) peptide. Despite the wide knowledge on the effects of Cu in mature brain metabolism, the consequence of its overload on immature neurons remains unknown. Therefore, we used an undifferentiated human neuroblastoma cell line (SH-SY5Y) to analyze the effect of sublethal concentrations of Cu on 1- de novo Chol synthesis and membrane distribution; 2-APP levels in cells and its distribution in membrane rafts; 3-the levels of Aβ in the culture medium. Our results demonstrated that Cu increases reactive oxygen species (ROS) and favors Chol de novo synthesis in both ROS-dependent and independent manners. Also, at least part of these effects was due to the activation of 3-hydroxy-3-methyl glutaryl CoA reductase (HMGCR). In addition, Cu increases the Chol/PL ratio in the cellular membranes, specifically Chol content in membrane rafts. We found no changes in total APP cell levels; however, its presence in membrane rafts increases with the consequent increase of Aβ in the culture medium. We conclude that Cu overload favors Chol de novo synthesis in both ROS-dependent and independent manners, being at least in part, responsible for the high Chol levels found in the cell membrane and membrane rafts. These may promote the redistribution of APP into the rafts, favoring the amyloidogenic processing of this protein and increasing the levels of Aβ.
Collapse
Affiliation(s)
- Marlene Zubillaga
- Laboratorio
de Neurociencia, Instituto de Investigaciones Bioquímicas de
La Plata (INIBIOLP), CONICET (Consejo Nacional
de Investigaciones Científicas y Técnicas)—UNLP
(Universidad Nacional de La Plata), Calle 60 y 120, CP 1900 La Plata, Argentina
| | - Diana Rosa
- Laboratorio
de Nutrición Mineral, Fac. Cs Veterinarias, UNLP (Universidad Nacional de La Plata). Calle 60 CP 1900 La Plata, Argentina
| | - Mariana Astiz
- Institute
of Neurobiology, Center of Brain, Behavior and Metabolism, University of Lübeck, Marie-Curie-Strasse, 23562 Lübeck, Germany
| | - M. Alejandra Tricerri
- Laboratorio
de Neurociencia, Instituto de Investigaciones Bioquímicas de
La Plata (INIBIOLP), CONICET (Consejo Nacional
de Investigaciones Científicas y Técnicas)—UNLP
(Universidad Nacional de La Plata), Calle 60 y 120, CP 1900 La Plata, Argentina
| | - Nathalie Arnal
- Laboratorio
de Neurociencia, Instituto de Investigaciones Bioquímicas de
La Plata (INIBIOLP), CONICET (Consejo Nacional
de Investigaciones Científicas y Técnicas)—UNLP
(Universidad Nacional de La Plata), Calle 60 y 120, CP 1900 La Plata, Argentina
| |
Collapse
|
3
|
Arnal N, Morel G, Marra CA, Astiz M. Pro-apoptotic effects of low doses of dimethoate in rat brain. Toxicol Appl Pharmacol 2019; 363:57-63. [DOI: 10.1016/j.taap.2018.11.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 11/26/2018] [Accepted: 11/27/2018] [Indexed: 01/12/2023]
|
4
|
Lausada N, Arnal N, Astiz M, Marín MC, Lofeudo JM, Stringa P, Tacconi de Alaniz MJ, Tacconi de Gómez Dumm N, Hurtado de Catalfo G, Cristalli de Piñero N, Pallanza de Stringa MC, Illara de Bozzolo EM, Bozzarello EG, Cristalli DO, Marra CA. Dietary fats significantly influence the survival of penumbral neurons in a rat model of chronic ischemic by modifying lipid mediators, inflammatory biomarkers, NOS production, and redox-dependent apoptotic signals. Nutrition 2015; 31:1430-42. [PMID: 26429666 DOI: 10.1016/j.nut.2015.05.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 05/01/2015] [Accepted: 05/21/2015] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Brain stroke is the third most important cause of death in developed countries. We studied the effect of different dietary lipids on the outcome of a permanent ischemic stroke rat model. METHODS Wistar rats were fed diets containing 7% commercial oils (S, soybean; O, olive; C, coconut; G, grape seed) for 35 d. Stroke was induced by permanent middle cerebral artery occlusion. Coronal slices from ischemic brains and sham-operated animals were supravitally stained. Penumbra and core volumes were calculated by image digitalization after 24, 48, and 72 h poststroke. Homogenates and mitochondrial fractions were prepared from different zones and analyzed by redox status, inflammatory markers, ceramide, and arachidonate content, phospholipase A2, NOS, and proteases. RESULTS Soybean (S) and G diets were mainly prooxidative and proinflammatory by increasing the liberation of arachidonate and its transformation into prostaglandins. O was protective in terms of redox homeostatic balance, minor increases in lipid and protein damage, conservation of reduced glutathione, protective activation of NOS in penumbra, and net ratio of anti-to proinflammatory cytokines. Apoptosis (caspase-3, milli- and microcalpains) was less activated by O than by any other diet. CONCLUSION Dietary lipids modulate NOS and PLA2 activities, ceramide production, and glutathione import into the mitochondrial matrix, finally determining the activation of the two main protease systems involved in programmed cell death. Olive oil appears to be a biological source for the isolation of protective agents that block the expansion of brain core at the expense of penumbral neurons.
Collapse
Affiliation(s)
- Natalia Lausada
- LTO (Laboratorio de Transplante de Órganos), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Nathalie Arnal
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Mariana Astiz
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - María Cristina Marín
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Juan Manuel Lofeudo
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Pablo Stringa
- LTO (Laboratorio de Transplante de Órganos), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - María J Tacconi de Alaniz
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Nelva Tacconi de Gómez Dumm
- LTO (Laboratorio de Transplante de Órganos), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Graciela Hurtado de Catalfo
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Norma Cristalli de Piñero
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - María Cristina Pallanza de Stringa
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Eva María Illara de Bozzolo
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - Enrique Gustavo Bozzarello
- DAIS (Dirección de Aplicación de Imágenes Satelitarias), Ministerio de Infraestructura de la Pcia. de Buenos Aires, La Plata, Argentina
| | | | - Carlos Alberto Marra
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT-La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina.
| |
Collapse
|
5
|
Arnal N, Castillo O, de Alaniz MJT, Marra CA. Effects of Copper and/or Cholesterol Overload on Mitochondrial Function in a Rat Model of Incipient Neurodegeneration. Int J Alzheimers Dis 2013; 2013:645379. [PMID: 24363953 PMCID: PMC3836397 DOI: 10.1155/2013/645379] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [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: 08/04/2013] [Accepted: 09/13/2013] [Indexed: 01/22/2023] Open
Abstract
Copper (Cu) and cholesterol (Cho) are both associated with neurodegenerative illnesses in humans and animals models. We studied the effect in Wistar rats of oral supplementation with trace amounts of Cu (3 ppm) and/or Cho (2%) in drinking water for 2 months. Increased amounts of nonceruloplasmin-bound Cu were observed in plasma and brain hippocampus together with a higher concentration of ceruloplasmin in plasma, cortex, and hippocampus. Cu, Cho, and the combined treatment Cu + Cho were able to induce a higher Cho/phospholipid ratio in mitochondrial membranes with a simultaneous decrease in glutathione content. The concentration of cardiolipin decreased and that of peroxidation products, conjugated dienes and lipoperoxides, increased. Treatments including Cho produced rigidization in both the outer and inner mitochondrial membranes with a simultaneous increase in permeability. No significant increase in Cyt C leakage to the cytosol was observed except in the case of cortex from rats treated with Cu and Cho nor were there any significant changes in caspase-3 activity and the Bax/Bcl2 ratio. However, the A β (1-42)/(1-40) ratio was higher in cortex and hippocampus. These findings suggest an incipient neurodegenerative process induced by Cu or Cho that might be potentiated by the association of the two supplements.
Collapse
Affiliation(s)
- Nathalie Arnal
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, 1900 La Plata, Argentina
| | - Omar Castillo
- Centro de Investigaciones Cardiovasculares (CIC), CCT-CONICET, 1900 La Plata, Argentina
| | - María J. T. de Alaniz
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, 1900 La Plata, Argentina
| | - Carlos A. Marra
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, 1900 La Plata, Argentina
- INIBIOLP, Cátedra de Bioquímica, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calles 60 y 120, 1900 La Plata, Argentina
| |
Collapse
|
6
|
Abstract
We investigated the effect of copper (Cu) overload (20–160 µM/24 h) in two cell lines of human hepatic (HepG2) and pulmonary (A-549) origin by determining lipid and protein damage and the response of the antioxidant defence system. A-549 cells were more sensitive to Cu overload than HepG2 cells. A marked increase was observed in both the cell lines in the nitrate plus nitrite concentration, protein carbonyls and thiobarbituric acid reactive substances (TBARS). The TBARS increase was consistent with an increment in saturated fatty acids at the expense of polyunsaturated acids in a Cu concentration-dependent fashion. Antioxidant enzymes were stimulated by Cu overload. Superoxide dismutase activity increased significantly in both the cell lines, with greater increases in HepG2 than in A-549 cells. A marked increase in ceruloplasmin and metallothionein content in both the cell types was also observed. Dose-dependent decreases in α-tocopherol and ferric reducing ability were observed. Total glutathione content was lower in A-549 cells and higher in HepG2. Calpain and caspase-3 were differentially activated in a dose-dependent manner under copper-induced reactive oxygen species production. We conclude that Cu exposure of human lung- and liver-derived cells should be considered a reliable experimental system for detailed study of mechanism/mechanisms by which Cu overload exerts its deleterious effects.
Collapse
Affiliation(s)
- N Arnal
- Facultad de Ciencias Médicas, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - MJT de Alaniz
- Facultad de Ciencias Médicas, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| | - CA Marra
- Facultad de Ciencias Médicas, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Universidad Nacional de La Plata, La Plata, Argentina
| |
Collapse
|
7
|
Arnal N, de Alaniz MJT, Marra CA. Cytotoxic effects of copper overload on human-derived lung and liver cells in culture. Biochim Biophys Acta Gen Subj 2012; 1820:931-9. [DOI: 10.1016/j.bbagen.2012.03.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Revised: 03/08/2012] [Accepted: 03/09/2012] [Indexed: 01/22/2023]
|
8
|
Arnal N, Tacconi de Alaniz MJ, Marra CA. Natural polyphenols may ameliorate damage induced by copper overload. Food Chem Toxicol 2011; 50:415-22. [PMID: 22036966 DOI: 10.1016/j.fct.2011.10.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 10/03/2011] [Accepted: 10/05/2011] [Indexed: 10/16/2022]
Abstract
The effect of the simultaneous exposure to transition metals and natural antioxidants frequently present in food is a question that needs further investigation. We aimed to explore the possible use of the natural polyphenols caffeic acid (CA), resveratrol (RES) and curcumin (CUR) to prevent damages induced by copper-overload on cellular molecules in HepG2 and A-549 human cells in culture. Exposure to 100μM/24h copper (Cu) caused extensive pro-oxidative damage evidenced by increased TBARS, protein carbonyls and nitrite productions in both cell types. Damage was aggravated by simultaneous incubation with 100μM of CA or RES, and it was also reflected in a decrease on cellular viability explored by trypan blue dye exclusion test and LDH leakage. Co-incubation with CUR produced opposite effects demonstrating a protective action which restored the level of biomarkers and cellular viability almost to control values. Thus, while CA and RES might aggravate the oxidative/nitrative damage of Cu, CUR should be considered as a putative protective agent. These results could stimulate further research on the possible use of natural polyphenols as neutralizing substances against the transition metal over-exposure in specific populations such as professional agrochemical sprayers and women using Cu-intrauterine devices.
Collapse
Affiliation(s)
- Nathalie Arnal
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120 (1900) La Plata, Argentina
| | | | | |
Collapse
|
9
|
Arnal N, Astiz M, de Alaniz MJT, Marra CA. Clinical parameters and biomarkers of oxidative stress in agricultural workers who applied copper-based pesticides. Ecotoxicol Environ Saf 2011; 74:1779-1786. [PMID: 21700338 DOI: 10.1016/j.ecoenv.2011.05.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2010] [Revised: 02/22/2011] [Accepted: 05/29/2011] [Indexed: 05/31/2023]
Abstract
Copper based-pesticides are widely used in agricultural practice throughout the world. We studied the (i) concentration of Cu and proteins involved in Cu homeostasis, (ii) plasma redox status, and (iii) biomarkers of exposure in Cu-based pesticide applicators in order to compare them with clinical biochemical tests. Thirty-one professional applicators and 32 control subjects were recruited. Oxidative stress biomarkers, ceruloplasmin (CRP), metallothioneins (MTs), copper, hematological parameters, and biochemical markers for pancreatic, hepatic and renal function were measured in plasma. Copper was increased in the exposed group compared to the control group concomitantly with TBARS, protein carbonyls, and nitrate+nitrite levels. In the exposed group, α-tocopherol and the FRAP assay were lower and LDH, transaminases, GGT, ALP, urea, creatinine, CRP and MTs were higher than in the control group. The relative leukocyte subclasses were also different between the two groups. Clinical chemistry tests did not surpass the upper reference limit. Our results suggest that the incorporation of oxidative stress biomarkers to biochemical/clinical tests should be considered for validation and included in the human health surveillance protocols.
Collapse
Affiliation(s)
- Nathalie Arnal
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, (1900) La Plata, Argentina
| | | | | | | |
Collapse
|
10
|
Astiz M, Arnal N, de Alaniz MJT, Marra CA. Occupational exposure characterization in professional sprayers: clinical utility of oxidative stress biomarkers. Environ Toxicol Pharmacol 2011; 32:249-258. [PMID: 21843806 DOI: 10.1016/j.etap.2011.05.010] [Citation(s) in RCA: 14] [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] [Subscribe] [Scholar Register] [Received: 12/19/2010] [Revised: 05/08/2011] [Accepted: 05/28/2011] [Indexed: 05/31/2023]
Abstract
The impact of involuntary exposure to pesticides was studied in a group of professional sprayers (S) (25±5 years old) exposed to various agrochemicals for about 10 years. The results were compared with a group of non exposed people (C). S group showed hematological, renal, pancreatic and hepatic biomarkers within the reference values established for the general population, including cholinesterase activity. In spite of that, all the biochemical tests were statistically different compared to C. On the other hand, oxidative stress biomarkers (OSB) such as plasma tocopherol and the total reducing ability of plasma were significantly decreased, while protein carbonyls, thiobarbituric acid-reactive substances, total glutathione and the sum of nitrites and nitrates were increased in the exposed group. Results demonstrated that screening laboratory tests could not be fully sensitive in detecting sub-clinical exposure to pesticides, and also suggest that OSB could be validated and included in health surveillance protocols.
Collapse
Affiliation(s)
- Mariana Astiz
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120 (1900) La Plata, Argentina
| | | | | | | |
Collapse
|
11
|
Arnal N, de Alaniz MJ, Marra CA. Carnosine and neocuproine as neutralizing agents for copper overload-induced damages in cultured human cells. Chem Biol Interact 2011; 192:257-63. [DOI: 10.1016/j.cbi.2011.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 12/28/2010] [Accepted: 03/28/2011] [Indexed: 12/11/2022]
|
12
|
Arnal N, Cristalli DO, de Alaniz MJ, Marra CA. Clinical utility of copper, ceruloplasmin, and metallothionein plasma determinations in human neurodegenerative patients and their first-degree relatives. Brain Res 2010; 1319:118-30. [DOI: 10.1016/j.brainres.2009.11.085] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Revised: 11/04/2009] [Accepted: 11/08/2009] [Indexed: 01/11/2023]
|
13
|
Bienvenu P, Ferreux L, Andreoletti G, Arnal N, Lépy MC, Bé MM. Determination of 126Sn half-life from ICP-MS and gamma spectrometry measurements. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2009.1673] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
A new value of 126Sn half-life was determined by combination of inductively coupled plasma-mass spectrometry (ICP-MS) and gamma spectrometry measurements on purified sample solutions collected from nuclear fuel reprocessing. 126Sn was isolated through dissolution of fission product precipitates and liquid-liquid extraction with N-benzoyl-N-phenyl-hydroxylamine (BPHA). The abundance of 126Sn atoms together with the absence of interfering species in the analysed solutions made it possible to measure both mass concentration and nuclide activity with high precision and accuracy. This led to a 126Sn half-life value of 1.980(57)×105 a.
Collapse
|
14
|
Uyttewaal M, Arnal N, Quadrado M, Martin-Canadell A, Vrielynck N, Hiard S, Gherbi H, Bendahmane A, Budar F, Mireau H. Characterization of Raphanus sativus pentatricopeptide repeat proteins encoded by the fertility restorer locus for Ogura cytoplasmic male sterility. Plant Cell 2008; 20:3331-45. [PMID: 19098270 PMCID: PMC2630448 DOI: 10.1105/tpc.107.057208] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2007] [Revised: 10/31/2008] [Accepted: 12/05/2008] [Indexed: 05/17/2023]
Abstract
Cytoplasmic male sterility is a maternally inherited trait in higher plants that prevents the production of functional pollen. Ogura cytoplasmic male sterility in radish (Raphanus sativus) is regulated by the orf138 mitochondrial locus. Male fertility can be restored when orf138 accumulation is suppressed by the nuclear Rfo locus, which consists of three genes putatively encoding highly similar pentatricopeptide repeat proteins (PPR-A, -B, and -C). We produced transgenic rapeseed (Brassica napus) plants separately expressing PPR-A and PPR-B and demonstrated that both encoded proteins accumulated preferentially in the anthers of young flower buds. Immunodetection of ORF138 showed that, unlike PPR-B, PPR-A had no effect on the synthesis of the sterility protein. Moreover, immunolocalization experiments indicated that complete elimination of ORF138 from the tapetum of anthers correlated with the restoration of fertility. Thus, the primary role of PPR-B in restoring fertility is to inhibit ORF138 synthesis in the tapetum of young anthers. In situ hybridization experiments confirmed, at the cellular level, that PPR-B has no effect on the accumulation of orf138 mRNA. Lastly, immunoprecipitation experiments demonstrated that PPR-B, but not PPR-A, is associated with the orf138 RNA in vivo, linking restoration activity with the ability to directly or indirectly interact with the orf138 RNA. Together, our data support a role for PPR-B in the translational regulation of orf138 mRNA.
Collapse
Affiliation(s)
- M Uyttewaal
- Institut National de la Recherche Agronomique, Station de Génétique et d'Amélioration des Plantes, 78026 Versailles, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Abstract
We describe a new and potentially universal selection system for mitochondrial transformation based on bacterial genes, and demonstrate its feasibility in Saccharomyces cerevisiae. We first found that cytoplasmically synthesized Barnase, an RNase, interferes with mitochondrial gene expression when targeted to the organelle, without causing lethality when expressed at appropriate levels. Next, we synthesized a gene that uses the yeast mitochondrial genetic code to direct the synthesis of the specific Barnase inhibitor Barstar, and demonstrated that expression of this gene, BARSTM, integrated in mtDNA protects respiratory function from imported barnase. Finally, we showed that screening for resistance to mitochondrially targeted barnase can be used to identify rare mitochondrial transformants that had incorporated BARSTM in their mitochondrial DNA. The possibility of employing this strategy in other organisms is discussed.
Collapse
Affiliation(s)
- H Mireau
- Station de Génétique et d'Amélioration des Plantes, INRA, Route de Saint-Cyr, 78026 Versailles, France.
| | | | | |
Collapse
|
16
|
Yerle M, Pinton P, Delcros C, Arnal N, Milan D, Robic A. Generation and characterization of a 12,000-rad radiation hybrid panel for fine mapping in pig. Cytogenet Genome Res 2003; 97:219-28. [PMID: 12438716 DOI: 10.1159/000066616] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.6] [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: 11/19/2022] Open
Abstract
We have constructed a 12,000-rad porcine whole-genome radiation hybrid panel to complement the first generation 7,000-rad panel (IMpRH) and allow higher resolution mapping studies both in specific areas of interest and on the whole genome. We analyzed 243 hybrid clones on the basis of their marker retention frequency to produce a final panel of 90 hybrid clones with an average retention frequency of 35.4%. The resolution of this 12,000-rad panel (IMNpRH2) was compared to the resolution of the 7,000-rad panel (IMpRH) by constructing framework maps in the 2.4-Mb region of porcine chromosome 15 containing the acid meat RN gene. In this region, two-point analysis was used to estimate RH distances and demonstrates their reliability with the estimation of physical distances. This study demonstrates that the 12,000-rad panel constitutes a powerful tool for constructing high-resolution maps. Indeed, the resolution of IMNpRH2 (12-14 kb/cR(12,000)) is two to three times more than that of IMpRH (35-37 kb/cR(7,000)). As expected, the increase in the radiation dose allows an increase of the mapping resolution in terms of kb/cR with the same suppleness of use for mapping experiments. In addition the RH map constructed in the region investigated proved to be more homogeneous on IMNpRH2 than on IMpRH.
Collapse
Affiliation(s)
- M Yerle
- Institut National de la Recherche Agronomique, Laboratoire de Génétique Cellulaire, Castanet-Tolosan, France.
| | | | | | | | | | | |
Collapse
|