1
|
Su HY, Lai CS, Lee KH, Chiang YW, Chen CC, Hsu PC. Prenatal exposure to low-dose di-(2-ethylhexyl) phthalate (DEHP) induces potentially hepatic lipid accumulation and fibrotic changes in rat offspring. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 269:115776. [PMID: 38056127 DOI: 10.1016/j.ecoenv.2023.115776] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 11/21/2023] [Accepted: 11/28/2023] [Indexed: 12/08/2023]
Abstract
Di(2-ethylhexyl) phthalate (DEHP) is a plasticizer that is widely used to enhance the flexibility and durability of various products. As an endocrine disruptor, DEHP can interfere with normal hormonal functions, posing substantial health risks to organisms. Given the critical role of the liver in DEHP metabolism, we investigated potential liver damage in offspring induced by prenatal exposure to low doses of DEHP in Sprague Dawley rats. Pregnant rats were divided into three groups and administered 20 or 200 μg/kg/day of DEHP or corn oil vehicle control via oral gavage from gestation days 0-20. Male rat offspring were euthanized on postnatal day 84, and blood and liver specimens were collected for analysis. We observed fibrotic changes in the livers of the exposed groups, accompanied by the proliferation and activation of hepatic stellate cells and upregulated expression of TGF-B and collagen 1A1. Additionally, an inflammatory response, characterized by increased macrophage infiltration and elevated levels of pro-inflammatory cytokines, was evident. Third, hepatic and serum triglyceride and serum cholesterol were notably increased, along with upregulated expression of lipid metabolism-related proteins, such as sterol regulatory element-binding protein-1c, acetyl-CoA carboxylase, fatty acid synthase, and diacylglycerol O-acyltransferase 1, particularly in the low-dose group. These results suggest that prenatal exposure to DEHP can disrupt lipid metabolism, resulting in hepatic lipid accumulation in the offspring. This exposure may also induce an inflammatory response that contributes to the development of liver fibrosis. Thus, even at relatively low doses, such exposure can precipitate latent liver damage in offspring.
Collapse
Affiliation(s)
- Hung-Yuan Su
- Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan; School of Chinese Medicine for Post Baccalaureate, I-Shou University, Kaohsiung 824, Taiwan; Department of Emergency Medicine, E-Da Hospital, I-Shou University, Kaohsiung 824, Taiwan
| | - Ching-Shu Lai
- Department of Seafood Science, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan
| | - Kuo-Hsin Lee
- Department of Emergency Medicine, E-Da Hospital, I-Shou University, Kaohsiung 824, Taiwan; School of Medicine, College of Medicine, I-Shou University, Kaohsiung 824, Taiwan
| | - Yu-Wei Chiang
- Department of Medical Research, Taipei Veterans General Hospital, Taipei 112, Taiwan; Department of Biology and Anatomy, National Defense Medical Center, Taipei 11490, Taiwan
| | - Chia-Chi Chen
- School of Chinese Medicine for Post Baccalaureate, I-Shou University, Kaohsiung 824, Taiwan; School of Medicine, College of Medicine, I-Shou University, Kaohsiung 824, Taiwan; Department of Physical Therapy, I-Shou University, Kaohsiung 824, Taiwan; Department of Emergency Medicine, E-Da Hospital, I-Shou University, Kaohsiung 824, Taiwan
| | - Ping-Chi Hsu
- Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan; Department of Public Health, Kaohsiung Medical University, Kaohsiung, 807, Taiwan; Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 404, Taiwan.
| |
Collapse
|
2
|
Fan S, Guo J, Han S, Du H, Wang Z, Fu Y, Han H, Hou X, Wang W. A Novel and Efficient Phthalate Hydrolase from Acinetobacter sp. LUNF3: Molecular Cloning, Characterization and Catalytic Mechanism. Molecules 2023; 28:6738. [PMID: 37764514 PMCID: PMC10537300 DOI: 10.3390/molecules28186738] [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: 08/08/2023] [Revised: 09/14/2023] [Accepted: 09/17/2023] [Indexed: 09/29/2023] Open
Abstract
Phthalic acid esters (PAEs), which are widespread environmental contaminants, can be efficiently biodegraded, mediated by enzymes such as hydrolases. Despite great advances in the characterization of PAE hydrolases, which are the most important enzymes in the process of PAE degradation, their molecular catalytic mechanism has rarely been systematically investigated. Acinetobacter sp. LUNF3, which was isolated from contaminated soil in this study, demonstrated excellent PAE degradation at 30 °C and pH 5.0-11.0. After sequencing and annotating the complete genome, the gene dphAN1, encoding a novel putative PAE hydrolase, was identified with the conserved motifs catalytic triad (Ser201-Asp295-His325) and oxyanion hole (H127GGG130). DphAN1 can hydrolyze DEP (diethyl phthalate), DBP (dibutyl phthalate) and BBP (benzyl butyl phthalate). The high activity of DphAN1 was observed under a wide range of temperature (10-40 °C) and pH (6.0-9.0). Moreover, the metal ions (Fe2+, Mn2+, Cr2+ and Fe3+) and surfactant TritonX-100 significantly activated DphAN1, indicating a high adaptability and tolerance of DphAN1 to these chemicals. Molecular docking revealed the catalytic triad, oxyanion hole and other residues involved in binding DBP. The mutation of these residues reduced the activity of DphAN1, confirming their interaction with DBP. These results shed light on the catalytic mechanism of DphAN1 and may contribute to protein structural modification to improve catalytic efficiency in environment remediation.
Collapse
Affiliation(s)
- Shuanghu Fan
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Technical Innovation Center for Utilization of Edible and Medicinal Fungi in Hebei Province, Langfang 065000, China
| | - Jingjing Guo
- School of Chemistry and Materials Science, Langfang Normal University, Langfang 065000, China;
| | - Shaoyan Han
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
| | - Haina Du
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
| | - Zimeng Wang
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
| | - Yajuan Fu
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
- Technical Innovation Center for Utilization of Edible and Medicinal Fungi in Hebei Province, Langfang 065000, China
| | - Hui Han
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
- Technical Innovation Center for Utilization of Edible and Medicinal Fungi in Hebei Province, Langfang 065000, China
| | - Xiaoqiang Hou
- College of Life Science, Langfang Normal University, Langfang 065000, China; (S.F.); (S.H.); (H.D.); (Z.W.); (Y.F.); (H.H.)
- Technical Innovation Center for Utilization of Edible and Medicinal Fungi in Hebei Province, Langfang 065000, China
| | - Weixuan Wang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- National Nanfan Research Institute (Sanya), Chinese Academy of Agricultural Sciences, Sanya 572024, China
| |
Collapse
|
3
|
Liu B, Wang W, Qiu J, Huang X, Qiu S, Bao Y, Xu S, Ruan L, Ran T, He J. Crystal structures of herbicide-detoxifying esterase reveal a lid loop affecting substrate binding and activity. Nat Commun 2023; 14:4343. [PMID: 37468532 DOI: 10.1038/s41467-023-40103-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 07/11/2023] [Indexed: 07/21/2023] Open
Abstract
SulE, an esterase, which detoxifies a variety of sulfonylurea herbicides through de-esterification, provides an attractive approach to remove environmental sulfonylurea herbicides and develop herbicide-tolerant crops. Here, we determined the crystal structures of SulE and an activity improved mutant P44R. Structural analysis revealed that SulE is a dimer with spacious binding pocket accommodating the large sulfonylureas substrate. Particularly, SulE contains a protruding β hairpin with a lid loop covering the active site of the other subunit of the dimer. The lid loop participates in substrate recognition and binding. P44R mutation altered the lid loop flexibility, resulting in the sulfonylurea heterocyclic ring repositioning to a relative stable conformation thus leading to dramatically increased activity. Our work provides important insights into the molecular mechanism of SulE, and establish a solid foundation for further improving the enzyme activity to various sulfonylurea herbicides through rational design.
Collapse
Affiliation(s)
- Bin Liu
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
- College of Life Sciences, Jiangxi Normal University, Nanchang, 330022, China
| | - Weiwu Wang
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jiguo Qiu
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xing Huang
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Shenshen Qiu
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yixuan Bao
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Siqiong Xu
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Luyao Ruan
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Tingting Ran
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Jian He
- Key Laboratory of Agricultural Environmental Microbiology of Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
| |
Collapse
|