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| 3. |
- Aggett, Peter, et al.
(författare)
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Essential metals : assessing risks from dificiency and toxicity
- 2015. - 4
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Ingår i: Handbook on the toxicology of metals. - : Academic Press. - 9780123982926 ; , s. 281-297
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Bokkapitel (refereegranskat)abstract
- Recommendations aimed at protecting the public from toxicity of essential elements including essential metals have usually been developed separately from those recommendations aimed at protection from deficiency. Because of the uncertainties involved in the evaluations, these recommendations have sometimes been in conflict, emphasizing the need for a new approach, including a balanced consideration of nutritional and toxicological data. In developing these new principles of evaluation, some basic concepts based on interindividual variability in sensitivity to deficiency and toxicity must be considered. Such variation translates into one interval of (low) daily intakes, at which there is a risk of developing deficiency, and another interval of (high) dietary intakes at which toxicity may occur. In most instances, there is a third set of intakes in between, which represents the acceptable range of oral intake (AROI), in which no adverse effects occur. It must be noted, however, that a range cannot be found that protects all persons from adverse effects. Those persons with genetically determined sensitivity may require higher intakes to avoid deficiency or lower intakes to avoid toxicity than those defined by the AROI. The AROI is defined as protecting 95% of an unselected human population from minimal adverse effects of deficiency or toxicity.
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| 4. |
- Aggett, Peter, et al.
(författare)
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Essential metals : assessing risks from deficiency and toxicity
- 2022. - 5
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Ingår i: Handbook on the toxicology of metals. - London : Academic Press. - 9780128232927 ; , s. 385-406
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Bokkapitel (refereegranskat)abstract
- Recommendations aimed at protecting the public from toxicity of essential elements including essential metals have usually been developed separately from those recommendations aimed at protection from deficiency. Because of the uncertainties involved in the evaluations, these recommendations have sometimes been in conflict, emphasizing the need for a new approach, including a balanced consideration of nutritional and toxicological data. In developing these new principles of evaluation, some basic concepts based on interindividual variability in sensitivity to deficiency and toxicity must be considered. Such variation translates into one interval of (low) daily intakes, at which there is a risk of developing deficiency, and another interval of (high) dietary intakes at which toxicity may occur. In most instances, there is a third set of intakes in between, which represents the acceptable range of oral intake (AROI), in which no adverse effects occur. This range determined from a homeostatic or biologically based (BBM) approach, which is discussed here, would be expected to apply to the general population. It must be noted, however, that this range would not protect all persons from adverse effects: this applies to those with genetically determined sensitivity, who may require higher intakes to avoid deficiency or lower intakes to avoid toxicity than those defined by the AROI. Nonetheless, AROI could be derived to protect 95% of the general human population from minimal adverse effects of deficiency or toxicity arising from inadequate and excessive intakes. As such the correspondence of these values to current Health-Based Guidance Values (HBGVs) and reference intakes of essential metals (EMs), and the roles of the BBM/Homeostatic Approach in Risk Assessment of EMs are of important public health interest.
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| 6. |
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| 7. |
- Becking, George C., et al.
(författare)
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Essential Metals : Assessing Risks from Deficiency and Toxicity
- 2007. - 3
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Ingår i: Handbook on the Toxicology of Metals, 3rd Edition. - San Diego : Elsevier. - 9780123694133 ; , s. 163-176
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Recommendations aimed at protecting the public from toxicity of essential elements have usually been developed separately from those recommendations aimed at protection from deficiency. Because of the uncertainties involved in the evaluations, these recommendations have sometimes been in conflict, emphasizing the need for a new approach, including a balanced consideration of nutritional and toxicological data. In developing these new principles of evaluation, some basic concepts based on interindividual variability in sensitivity to deficiency and toxicity must be considered. Such variation translates into one interval of (low) daily intakes, at which there is risk of developing deficiency, and another interval of (high) dietary intakes at which toxicity may occur. In most instances, there is a third set of intakes in between, which represents the acceptable range of oral intakes (AROI) in which no adverse effects occur. It must be noted, however, that such a range cannot be found that protects all persons from adverse effects. Those persons with genetically determined sensitivity may require higher intakes to avoid deficiency or lower intakes to avoid toxicity than those defined by the AROI. AROI is defined as protecting 95% of an unselected human population from minimal adverse effects of deficiency or toxicity.
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| 8. |
- Bergdahl, Ingvar A., et al.
(författare)
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Non-renal effects and the risk assessment of environmental cadmium exposure.
- 2014
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Ingår i: Environmental health perspectives. - : Environmental Health Perspectives. - 1552-9924 .- 0091-6765. ; 122:5, s. 431-8
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Tidskriftsartikel (refereegranskat)abstract
- Exposure to cadmium (Cd) has long been recognized as a health hazard, both in industry and in general populations with high exposure. Under the currently prevailing health risk assessment, the relationship between urinary Cd (U-Cd) concentrations and tubular proteinuria is used. However, doubts have recently been raised regarding the justification of basing the risk assessment on this relationship at very low exposure.
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| 9. |
- Broberg, Karin, et al.
(författare)
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Gene-Environment Interactions for Metals
- 2014. - 4th
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Ingår i: Handbook on the Toxicology of Metals. - 9780444594532 - 9780123973399 ; 1, s. 239-264
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Bokkapitel (refereegranskat)abstract
- It has become increasingly clear that the individual genetic background influences susceptibility to metal toxicity. Genetic variation in genes that regulate metal toxicokinetics and toxicodynamics influence the degree of metal accumulation and retention in the body, as well as toxic effects. Moreover, factors that regulate gene expression, so-called epigenetic factors, have been identified as targets for metal toxicity. This chapter addresses what is currently known about such gene-environment interactions. The picture that emerges for most metals is that the genetic influence is probably not attributed to a single gene for each metal; rather it is polygenic, with some genes having a stronger effect than others. The presence of variants of the human leukocyte antigen system and the risk of beryllium-related pulmonary disease was one of the first and maybe the strongest example of a gene-environment interaction. There are also clear gene-environment interactions for arsenic and lead. Evidence is rapidly growing for epigenetic effects of metals, e.g. for arsenic, cadmium, and lead, which may explain the association between metal exposure early in life and toxic effects later in life, as well as metal carcinogenicity.
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| 10. |
- Chen, Liang, et al.
(författare)
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Critical exposure level of cadmium for elevated urinary metallothionein--an occupational population study in China.
- 2006
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Ingår i: Toxicology and applied pharmacology. - : Elsevier BV. - 0041-008X. ; 215:1, s. 93-9
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Tidskriftsartikel (refereegranskat)abstract
- Cadmium is a well-known nephrotoxic agent with extremely long biological half-time of 15-30 years in humans. To prevent nephrotoxicity induced by cadmium, it is necessary to identify specific and sensitive biomarkers of cadmium exposure and renal damage, and to define critical exposure levels related to minimal nephrotoxicity in humans. In this study, urinary cadmium (UCd) and blood cadmium (BCd) were used as cadmium exposure indicators, urinary beta(2)-microglobulin (UB2M), N-acetyl-beta-D-glucosaminidase (UNAG) and albumin (UALB) were applied as the effect biomarkers of tubular and glomerular dysfunction. The relationship between urinary metallothionein (UMT) and cadmium exposure biomarkers as well as effect biomarkers was examined. Significant correlations were found between the UMT and BCd, and UCd. At the same time, UB2M, UALB and UNAG showed positive correlation with UMT as well. According to this result, cadmium-exposed individuals with renal dysfunction excreted more metallothionein than those without. Dose-response relationships between UCd and urinary indicators of renal dysfunction were studied. The critical concentration of UCd was quantitatively estimated by the benchmark dose (BMD) method. The lower confidence limit of the BMD-10 (BMDL) of UCd (3.1 microg/g Cr) related to increased excretion of urinary metallothionein was slightly higher than that for UNAG (2.7 microg/g Cr), but lower than those of UB2M (3.4 microg/g Cr) and UALB (4.2 microg/g Cr). The results demonstrate that UMT may be used as a sensitive biomarker of renal tubular dysfunction in cadmium-exposed populations.
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