1
|
Zhou K, Yin D, Liu C, Sun R. Investigating the role of poly-γ-glutamic acid in Pennisetum giganteum phytoextraction of mercury-contaminated soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 944:173707. [PMID: 38866170 DOI: 10.1016/j.scitotenv.2024.173707] [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: 01/27/2024] [Revised: 05/16/2024] [Accepted: 05/31/2024] [Indexed: 06/14/2024]
Abstract
Farmland mercury (Hg) pollution poses a significant threat to human health, but there is a lack of highly efficient phytoextraction for its remediation at present. This study investigates the impact of poly-γ-glutamic acid (γ-PGA) on the phytoextraction capabilities of Pennisetum giganteum (P. giganteum) in Hg-contaminated soil. Our research indicates that amending γ-PGA to soil markedly enhances the assimilation of soil Hg by P. giganteum and transformation of Hg within itself, with observed increases in Hg concentrations in roots, stems, and leaves by 1.1, 4.3, and 18.9 times, respectively, compared to the control. This enhancement is attributed to that γ-PGA can facilitate the hydrophilic and bioavailable of soil Hg. Besides, γ-PGA can stimulate the abundance of Hg-resistance bacteria Proteobacteria in the rhizosphere of P. giganteum, thus increasing the mobility and uptake of soil Hg by P. giganteum roots. Moreover, the hydrophilic nature of Hg-γ-PGA complexes supports their transport via the apoplastic pathway, across the epidermis, and through the Casparian strip, eventually leading to immobilization in the mesophyll tissues. This study provides novel insights into the mechanisms of Hg phytoextraction, demonstrating that γ-PGA significantly enhances the effectiveness of P. giganteum in Hg uptake and translocation. The findings suggest a promising approach for the remediation of Hg-contaminated soil, offering a sustainable and efficient strategy for environmental management and health risk mitigation.
Collapse
Affiliation(s)
- Kun Zhou
- Guizhou Normal University, Guiyang 550001, PR China
| | - Deliang Yin
- Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang 550025, PR China
| | - Chen Liu
- Guizhou Key Laboratory for Mountainous Environmental Information and Ecological Protection, Guizhou Normal University, Guiyang 550001, PR China
| | - Rongguo Sun
- Guizhou Key Laboratory for Mountainous Environmental Information and Ecological Protection, Guizhou Normal University, Guiyang 550001, PR China.
| |
Collapse
|
2
|
Rezqaoui A, Boumlah S, El Hessni A, El Brouzi MY, El Hamzaoui A, Ibouzine-Dine L, Benkirane S, Adnani M, Mesfioui A. Evaluating the Protective Effects of Melatonin Against Chronic Iron Administration in Male Wistar Rats: a Comparative Analysis of Affective, Cognitive, and Oxidative Stress with EDTA Chelator. Biol Trace Elem Res 2023:10.1007/s12011-023-04006-2. [PMID: 38146034 DOI: 10.1007/s12011-023-04006-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 12/06/2023] [Indexed: 12/27/2023]
Abstract
Iron is the dominant metal in the brain and is distributed widely. However, it can lead to various neuropathological and neurobehavioral abnormalities as well as oxidative stress. On the other hand, melatonin, a pineal hormone, is known for its neuroprotective properties, as well as its ability to act as a natural chelator against oxidative stress. It has also been used as an antidepressant and anxiolytic. The study investigated the potential of melatonin and EDTA treatment to prevent anxiety, depressive behavior, and memory impairment in male rats induced by chronic iron administration, and its connection to oxidative stress regulation in the hippocampus and prefrontal cortex. The rats were divided into six groups and intraperitoneally injected for 8 weeks with NaCl solution (control), iron sulfate (1 mg/kg), melatonin (4 mg/kg), EDTA (4 mg/kg), 1 mg/kg of iron + 4 mg/kg of melatonin, or 1 mg/kg of iron + 4 mg/kg of EDTA. In this study, we performed a neurobehavioral assessment and biochemical determinations of oxidative stress levels in the hippocampus and prefrontal cortex of each animal. The results indicate that chronic exposure to iron sulfate induced anxiety-like depressive behavior, and cognitive impairment also increased the levels of lipid peroxidation and nitric oxide, and reduced the activity of catalase in the hippocampus and prefrontal cortex in male Wistar rats, suggesting the induction of oxidative stress. In contrast, these alterations were reversed by melatonin better than EDTA. The results of this study show that melatonin protects against the neurobehavioral changes caused by iron, which may be associated with decreasing oxidative stress in the hippocampus and prefrontal cortex.
Collapse
Affiliation(s)
- Ayoub Rezqaoui
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco.
| | - Soufiane Boumlah
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Aboubaker El Hessni
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Mohamed Yassine El Brouzi
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Abdelghafour El Hamzaoui
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Laila Ibouzine-Dine
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Samir Benkirane
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Manal Adnani
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| | - Abdelhalem Mesfioui
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences, Ibn Tofail University, B.P 242, Kenitra, Morocco
| |
Collapse
|