1
|
Peña LCS, Hernández AB, Del Razo LM. Decreased Arsenic Disposition and Alteration of its Metabolic Profile in mice Coexposed to Fluoride. Biol Trace Elem Res 2024; 202:1594-1602. [PMID: 37450204 PMCID: PMC10859321 DOI: 10.1007/s12011-023-03764-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 07/03/2023] [Indexed: 07/18/2023]
Abstract
Inorganic arsenic (iAs) and fluoride (iF) are ubiquitous elements whose coexistence is frequent in several regions of the world due to the natural contamination of water sources destined for human consumption. It has been reported that coexposure to these two elements in water can cause toxic effects on health, which are controversial since antagonistic and synergistic effects have been reported. However, there is little information on the possible toxicological interaction between concurrent exposure to iAs and iF on the iAs metabolism profile.The goal of this study was to determine the effect of iF exposure on iAs methylation patterns in the urine and the tissues of female mice of the C57BL/6 strain, which were divided into four groups and exposed daily for 10 days through drinking water as follows: purified water (control); arsenite 1 mg/L, fluoride 50 mg/L and arsenite & fluoride 1:50 mg/L.To characterize the iAs methylation pattern in concomitant iF exposure, iAs and its methylated metabolites (MAs and DMAs) were quantified in the tissues and the urine of mice was exposed to iAs alone or in combination. Our results showed a statistically significant decrease in the arsenic species concentrations and altered relative proportions of arsenic species in tissues and urine in the As-iF coexposure group compared to the iAs-exposed group. These findings show that iF exposure decreases arsenic disposition and alters methylation capacity.Nevertheless, additional studies are required to elucidate the mechanisms involved in the iAs-iF interaction through iF exposure affecting iAs disposition and metabolism.
Collapse
Affiliation(s)
- Luz C Sanchez Peña
- Departmento de Toxicologia, Centro de Investigación y de Estudios Avanzados, Av. IPN 2508, San Pedro Zacatenco, Mexico City, 07360, Mexico
| | - Angel Barrera Hernández
- Departmento de Toxicologia, Centro de Investigación y de Estudios Avanzados, Av. IPN 2508, San Pedro Zacatenco, Mexico City, 07360, Mexico
| | - Luz M Del Razo
- Departmento de Toxicologia, Centro de Investigación y de Estudios Avanzados, Av. IPN 2508, San Pedro Zacatenco, Mexico City, 07360, Mexico.
| |
Collapse
|
2
|
Mersaoui SY, Guilbert C, Chou H, Douillet C, Bohle DS, Stýblo M, Richard S, Mann KK. Arsenic 3 methyltransferase (AS3MT) automethylates on cysteine residues in vitro. Arch Toxicol 2022; 96:1371-1386. [PMID: 35244730 PMCID: PMC9013690 DOI: 10.1007/s00204-022-03248-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 02/02/2022] [Indexed: 11/25/2022]
Abstract
Arsenic toxicity is a global concern to human health causing increased incidences of cancer, bronchopulmonary, and cardiovascular diseases. In human and mouse, inorganic arsenic (iAs) is metabolized in a series of methylation steps catalyzed by arsenic (3) methyltransferase (AS3MT), forming methylated arsenite (MAsIII), dimethylarsenite (DMAIII) and the volatile trimethylarsine (TMA). The methylation of arsenic is coordinated by four conserved cysteines proposed to participate in catalysis, namely C33, C62, C157, and C207 in mouse AS3MT. The current model consists of AS3MT methylating iAs in the presence of the cofactor S-adenosyl-L-methionine (SAM), and the formation of intramolecular disulfide bonds following the reduction of MAsV to MAsIII. In the presence of endogenous reductants, these disulfide bonds are reduced, the enzyme re-generates, and the second round of methylation ensues. Using in vitro methylation assays, we find that AS3MT undergoes an initial automethylation step in the absence of iAs. This automethylation is enhanced by glutathione (GSH) and dithiothreitol (DTT), suggesting that reduced cysteines accept methyl groups from SAM to form S-methylcysteines. Following the addition of iAs, automethylation of AS3MT is decreased. Furthermore, using a Flag-AS3MT immunoprecipitation coupled to MS/MS, we identify both C33 and C62 as acceptors of the methyl group in vivo. Site-directed mutagenesis (C to A) revealed that three of the previously described cysteines were required for AS3MT automethylation. In vitro experiments show that automethylated AS3MT can methylate iAs in the presence of SAM. Thus, we propose that automethylated may represent an active conformation of AS3MT.
Collapse
Affiliation(s)
- Sofiane Y Mersaoui
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada
| | - Cynthia Guilbert
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada
| | - Hsiang Chou
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada
| | - Christelle Douillet
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, CB# 7461, Chapel Hill, NC, 27599, USA
| | - D Scott Bohle
- Department of Chemistry, McGill University, Otto Maass 233A, Montréal, Québec, H3A 0B8, Canada
| | - Miroslav Stýblo
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, CB# 7461, Chapel Hill, NC, 27599, USA
| | - Stéphane Richard
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada.
| | - Koren K Mann
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada.
| |
Collapse
|
4
|
Ramos-Treviño J, Bassol-Mayagoitia S, Hernández-Ibarra JA, Ruiz-Flores P, Nava-Hernández MP. Toxic Effect of Cadmium, Lead, and Arsenic on the Sertoli Cell: Mechanisms of Damage Involved. DNA Cell Biol 2018; 37:600-608. [PMID: 29746152 DOI: 10.1089/dna.2017.4081] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Over the past decades, an increase has been described in exposure to environmental toxins; consequently, a series of studies has been carried out with the aim of identifying problems associated with health. One of the main risk factors is exposure to heavy metals. The adverse effects that these compounds exert on health are quite complex and difficult to elucidate, in that they act at different levels and there are various signaling pathways that are implicated in the mechanisms of damage. The Sertoli cells plays a role of vital importance during the process of spermatogenesis, and it has been identified as one of the principal targets of heavy metals. In the present review, cadmium, lead, and arsenic are broached as altering the physiology of the Sertoli cells, citing mechanisms that have been cited in the literature.
Collapse
Affiliation(s)
- Juan Ramos-Treviño
- 1 Department of Reproductive Biology, Biomedical Research Center, Faculty of Medicine, Autonomous University of Coahuila (UAdeC) , Torreón, Coahuila, Mexico
| | - Susana Bassol-Mayagoitia
- 1 Department of Reproductive Biology, Biomedical Research Center, Faculty of Medicine, Autonomous University of Coahuila (UAdeC) , Torreón, Coahuila, Mexico
| | - José Anselmo Hernández-Ibarra
- 1 Department of Reproductive Biology, Biomedical Research Center, Faculty of Medicine, Autonomous University of Coahuila (UAdeC) , Torreón, Coahuila, Mexico
| | - Pablo Ruiz-Flores
- 2 Department of Genetics and Molecular Medicine, Biomedical Research Center, Faculty of Medicine, Autonomous University of Coahuila (UAdeC) , Torreón, Coahuila, Mexico
| | - Martha P Nava-Hernández
- 1 Department of Reproductive Biology, Biomedical Research Center, Faculty of Medicine, Autonomous University of Coahuila (UAdeC) , Torreón, Coahuila, Mexico
| |
Collapse
|
5
|
A SAM-dependent methyltransferase cotranscribed with arsenate reductase alters resistance to peptidyl transferase center-binding antibiotics in Azospirillum brasilense Sp7. Appl Microbiol Biotechnol 2014; 98:4625-36. [PMID: 24573606 DOI: 10.1007/s00253-014-5574-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Revised: 01/23/2014] [Accepted: 01/25/2014] [Indexed: 10/25/2022]
Abstract
The genome of Azospirillum brasilense harbors a gene encoding S-adenosylmethionine-dependent methyltransferase, which is located downstream of an arsenate reductase gene. Both genes are cotranscribed and translationally coupled. When they were cloned and expressed individually in an arsenate-sensitive strain of Escherichia coli, arsenate reductase conferred tolerance to arsenate; however, methyltransferase failed to do so. Sequence analysis revealed that methyltransferase was more closely related to a PrmB-type N5-glutamine methyltransferase than to the arsenate detoxifying methyltransferase ArsM. Insertional inactivation of prmB gene in A. brasilense resulted in an increased sensitivity to chloramphenicol and resistance to tiamulin and clindamycin, which are known to bind at the peptidyl transferase center (PTC) in the ribosome. These observations suggested that the inability of prmB:km mutant to methylate L3 protein might alter hydrophobicity in the antibiotic-binding pocket of the PTC, which might affect the binding of chloramphenicol, clindamycin, and tiamulin differentially. This is the first report showing the role of PrmB-type N5-glutamine methyltransferases in conferring resistance to tiamulin and clindamycin in any bacterium.
Collapse
|