Time-dependent hormetic dose responses of skin care product mixtures to Vibrio qinghaiensis sp.-Q67: Appearance and quantification

Gu, Zhong-Wei; Xie, Yu; Huang, Peng; Ding, Ting-Ting; Tao, Meng-Ting; Liu, Shu-Shen

doi:10.1016/j.scitotenv.2023.166651

Cited by 8 publications

(1 citation statement)

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“…The prevailing perspective regarding the mechanism of hormesis is Overcorrection/Overcompensation [9]. While a substantial body of experimental data supports this theory, further experimental results are required to quantify this process for environmental risk assessment across diverse subjects and stressors [10][11][12]. Notably, several studies have demonstrated that low-dose Cd in soil can enhance eggplant and rice yield while also significantly increasing intracellular enzyme activity in earthworms [13,14].…”

Section: Introductionmentioning

confidence: 99%

Unveiling a New Perspective on Cadmium-Induced Hormesis in Soil Enzyme Activity: The Relative Importance of Enzymatic Reaction Kinetics and Microbial Communities

Wu,

Agathokleous

et al. 2024

Agriculture

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Hormesis in soil enzymes is well-established, yet the underlying mechanism remains elusive. In this novel study, we investigated the effects of low-dose Cd exposure (0, 0.03, 0.3, 3, and 30 mg·kg−1) in farmland soil within a typical constructed wetland environment. We assessed the activities of four soil enzymes (urease (URE), denitrification enzyme (DEA), dehydrogenase (DHA), and alkaline phosphatase (ALP)) at varying exposure durations (0 h, 24 h, and 48 h), evaluating hormetic characteristics across these time intervals. Additionally, we determined kinetic parameters, specifically the Michaelis constant (Km) and maximum reaction velocity (Vmax), for these enzymes while examining potential alterations in microbial community structure. Our findings revealed hormesis in all four soil enzymes at 24 h of exposure, with varying stimulus width and maximum hormesis rates. Interestingly, heavy metals did not significantly influence the diversity of soil microbial communities, but they did inhibit the ability of soil microbial communities to secrete extracellular enzymes. This resulted in a reduction in the soil enzyme pool and a consequential shift in overall soil enzyme activities. The conclusion of this study is that low-dose Cd primarily reduced extracellular enzyme secretion by soil microorganisms, leading to a reduction in the size of the soil enzyme pool and thereby inducing hormesis in soil enzyme activities.

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