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Ito K, Kuramata M, Tanikawa H, Suda A, Yamaguchi N, Ishikawa S. Diversity and transcription of genes involved in respiratory As(V) reduction and As(III) methylation in Japanese paddy soils. BMC Microbiol 2024; 24:396. [PMID: 39379826 PMCID: PMC11462812 DOI: 10.1186/s12866-024-03562-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Accepted: 10/01/2024] [Indexed: 10/10/2024] Open
Abstract
BACKGROUND Arsenic (As) metabolism by soil microorganisms has an impact on As geochemical cycling in paddy soils, which in turn affects As uptake in rice. However, little is known about the key microorganisms involved in this process in Japanese paddy soil. RESULTS Total RNA was extracted from Japanese paddy soils with different levels of dissolved As under flooded conditions, and the transcription of As metabolic genes (arrA, ttrA and arsM) was analyzed via a metatranscriptomic approach. The results showed that ttrA was the predominant respiratory arsenate reductase gene transcribed in these soils rather than arrA, suggesting that ttrA contributes to the reductive dissolution of As. The predominant taxa expressing ttrA differed among soils but were mostly associated with genera known for their iron- and/or sulfate-reduction activity. In addition, a wide variety of microorganisms expressed and upregulated arsM approximately 5.0- to 13.2-fold at 9 d compared with 3 d of incubation under flooded conditions in flasks. CONCLUSIONS Our results support the involvement of microbial activity in the geochemical cycling of As in Japanese paddy soils and suggest that ttrA may be one of the key genes involved in the formation of arsenite, an inorganic species taken up by rice.
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Affiliation(s)
- Koji Ito
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Masato Kuramata
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Hachidai Tanikawa
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Aomi Suda
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Noriko Yamaguchi
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Satoru Ishikawa
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan.
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Covarrubias AA, Reyna-Jeldes M, Pedroso-Santana S, Marín S, Madero-Mendoza C, Demergasso C, Coddou C. Arsenic Nanoparticles Trigger Apoptosis via Anoikis Induction in OECM-1 Cells. Int J Mol Sci 2024; 25:6723. [PMID: 38928430 PMCID: PMC11204275 DOI: 10.3390/ijms25126723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 05/28/2024] [Accepted: 06/04/2024] [Indexed: 06/28/2024] Open
Abstract
Arsenic compounds have been used as therapeutic alternatives for several diseases including cancer. In the following work, we obtained arsenic nanoparticles (AsNPs) produced by an anaerobic bacterium from the Salar de Ascotán, in northern Chile, and evaluated their effects on the human oral squamous carcinoma cell line OECM-1. Resazurin reduction assays were carried out on these cells using 1-100 µM of AsNPs, finding a concentration-dependent reduction in cell viability that was not observed for the non-tumoral gastric mucosa-derived cell line GES-1. To establish if these effects were associated with apoptosis induction, markers like Bcl2, Bax, and cleaved caspase 3 were analyzed via Western blot, executor caspases 3/7 via luminometry, and DNA fragmentation was analyzed by TUNEL assay, using 100 µM cisplatin as a positive control. OECM-1 cells treated with AsNPs showed an induction of both extrinsic and intrinsic apoptotic pathways, which can be explained by a significant decrease in P-Akt/Akt and P-ERK/ERK relative protein ratios, and an increase in both PTEN and p53 mRNA levels and Bit-1 relative protein levels. These results suggest a prospective mechanism of action for AsNPs that involves a potential interaction with extracellular matrix (ECM) components that reduces cell attachment and subsequently triggers anoikis, an anchorage-dependent type of apoptosis.
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Affiliation(s)
- Alejandra A. Covarrubias
- Departamento de Ciencias Biomédicas, Facultad de Medicina, Universidad Católica del Norte, Coquimbo 1781421, Chile; (A.A.C.); (M.R.-J.)
- Núcleo para el Estudio del Cáncer a Nivel Básico, Aplicado y Clínico, Universidad Católica del Norte, Coquimbo 1781421, Chile; (S.P.-S.); (S.M.); (C.D.)
- Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago 8331150, Chile
- Facultad de Ciencias Agropecuarias, Universidad del Alba, La Serena 1700000, Chile
| | - Mauricio Reyna-Jeldes
- Departamento de Ciencias Biomédicas, Facultad de Medicina, Universidad Católica del Norte, Coquimbo 1781421, Chile; (A.A.C.); (M.R.-J.)
- Núcleo para el Estudio del Cáncer a Nivel Básico, Aplicado y Clínico, Universidad Católica del Norte, Coquimbo 1781421, Chile; (S.P.-S.); (S.M.); (C.D.)
- Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago 8331150, Chile
- Laboratory of Cancer Biology, Department of Oncology, Old Road Campus Research Building, University of Oxford, Oxford OX3 7DQ, UK
| | - Seidy Pedroso-Santana
- Núcleo para el Estudio del Cáncer a Nivel Básico, Aplicado y Clínico, Universidad Católica del Norte, Coquimbo 1781421, Chile; (S.P.-S.); (S.M.); (C.D.)
- Centro de Biotecnología “Profesor Alberto Ruiz”, Universidad Católica del Norte, Antofagasta 1200000, Chile
| | - Sabrina Marín
- Núcleo para el Estudio del Cáncer a Nivel Básico, Aplicado y Clínico, Universidad Católica del Norte, Coquimbo 1781421, Chile; (S.P.-S.); (S.M.); (C.D.)
- Centro de Biotecnología “Profesor Alberto Ruiz”, Universidad Católica del Norte, Antofagasta 1200000, Chile
| | - Carolina Madero-Mendoza
- Carrera de Medicina, Facultad de Medicina y Odontología, Universidad de Antofagasta, Antofagasta 1200000, Chile;
| | - Cecilia Demergasso
- Núcleo para el Estudio del Cáncer a Nivel Básico, Aplicado y Clínico, Universidad Católica del Norte, Coquimbo 1781421, Chile; (S.P.-S.); (S.M.); (C.D.)
- Centro de Biotecnología “Profesor Alberto Ruiz”, Universidad Católica del Norte, Antofagasta 1200000, Chile
| | - Claudio Coddou
- Departamento de Ciencias Biomédicas, Facultad de Medicina, Universidad Católica del Norte, Coquimbo 1781421, Chile; (A.A.C.); (M.R.-J.)
- Núcleo para el Estudio del Cáncer a Nivel Básico, Aplicado y Clínico, Universidad Católica del Norte, Coquimbo 1781421, Chile; (S.P.-S.); (S.M.); (C.D.)
- Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago 8331150, Chile
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Zhang Y, Boyanov MI, O'Loughlin EJ, Kemner KM, Sanford RA, Kim HS, Park SC, Kwon MJ. Reaction pathways and Sb(III) minerals formation during the reduction of Sb(V) by Rhodoferax ferrireducens strain YZ-1. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133240. [PMID: 38134691 DOI: 10.1016/j.jhazmat.2023.133240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/30/2023] [Accepted: 12/10/2023] [Indexed: 12/24/2023]
Abstract
Antimony (Sb), a non-essential metalloid, can be released into the environment through various industrial activities. Sb(III) is considered more toxic than Sb(V), but Sb(III) can be immobilized through the precipitation of insoluble Sb2S3 or Sb2O3. In the subsurface, Sb redox chemistry is largely controlled by microorganisms; however, the exact mechanisms of Sb(V) reduction to Sb(III) are still unclear. In this study, a new strain of Sb(V)-reducing bacterium, designated as strain YZ-1, that can respire Sb(V) as a terminal electron acceptor was isolated from Sb-contaminated soils. 16S-rRNA gene sequencing of YZ-1 revealed high similarity to a known Fe(III)-reducer, Rhodoferax ferrireducens. XRD and XAFS analyses revealed that bioreduction of Sb(V) to Sb(III) proceed through a transition from amorphous valentinite to crystalline senarmontite (allotropes of Sb2O3). Genomic DNA sequencing found that YZ-1 possesses arsenic (As) metabolism genes, including As(V) reductase arsC. The qPCR analysis showed that arsC was highly expressed during Sb(V)-reduction by YZ-1, and thus is proposed as the potential Sb(V) reductase in YZ-1. This study provides new insight into the pathways and products of microbial Sb(V) reduction and demonstrates the potential of a newly isolated bacterium for Sb bioremediation.
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Affiliation(s)
- Yidan Zhang
- Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Maxim I Boyanov
- Biosciences Division, Argonne National Laboratory, Lemont, IL 60439, USA; Bulgarian Academy of Sciences, Institute of Chemical Engineering, Sofia 1113, Bulgaria
| | | | - Kenneth M Kemner
- Biosciences Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Robert A Sanford
- Department of Earth Science & Environmental Change, University of Illinois Urbana-Champaign, Champaign, IL 61801, USA
| | - Han-Suk Kim
- Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Soo-Chan Park
- Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Man Jae Kwon
- Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Republic of Korea.
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Zhang B, Jiang X, Yu Y, Cui Y, Wang W, Luo H, Stergiadis S, Wang B. Rumen microbiome-driven insight into bile acid metabolism and host metabolic regulation. THE ISME JOURNAL 2024; 18:wrae098. [PMID: 38836500 PMCID: PMC11193847 DOI: 10.1093/ismejo/wrae098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 04/20/2024] [Accepted: 06/04/2024] [Indexed: 06/06/2024]
Abstract
Gut microbes play a crucial role in transforming primary bile acids (BAs) into secondary forms, which influence systemic metabolic processes. The rumen, a distinctive and critical microbial habitat in ruminants, boasts a diverse array of microbial species with multifaceted metabolic capabilities. There remains a gap in our understanding of BA metabolism within this ecosystem. Herein, through the analysis of 9371 metagenome-assembled genomes and 329 cultured organisms from the rumen, we identified two enzymes integral to BA metabolism: 3-dehydro-bile acid delta4,6-reductase (baiN) and the bile acid:Na + symporter family (BASS). Both in vitro and in vivo experiments were employed by introducing exogenous BAs. We revealed a transformation of BAs in rumen and found an enzyme cluster, including L-ribulose-5-phosphate 3-epimerase and dihydroorotate dehydrogenase. This cluster, distinct from the previously known BA-inducible operon responsible for 7α-dehydroxylation, suggests a previously unrecognized pathway potentially converting primary BAs into secondary BAs. Moreover, our in vivo experiments indicated that microbial BA administration in the rumen can modulate amino acid and lipid metabolism, with systemic impacts underscored by core secondary BAs and their metabolites. Our study provides insights into the rumen microbiome's role in BA metabolism, revealing a complex microbial pathway for BA biotransformation and its subsequent effect on host metabolic pathways, including those for glucose, amino acids, and lipids. This research not only advances our understanding of microbial BA metabolism but also underscores its wider implications for metabolic regulation, offering opportunities for improving animal and potentially human health.
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Affiliation(s)
- Boyan Zhang
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
| | - Xianzhe Jiang
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
| | - Yue Yu
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
| | - Yimeng Cui
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
| | - Wei Wang
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
| | - Hailing Luo
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
| | - Sokratis Stergiadis
- Department of Animal Sciences, School of Agriculture Policy and Development, University of Reading, Reading RG6 6EU, United Kingdom
| | - Bing Wang
- State Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P. R. China
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