Traditional supplements of selenium generally have a low degree of absorption and increased toxicity. Therefore, it is imperative to develop innovative systems as transporters of selenium compounds, which would raise the bioavailability of this element and allow its controlled release in the organism. Nanoscale selenium has attracted a great interest as a food additive especially in individuals with selenium deficiency, but also as a therapeutic agent without significant side effects in medicine. This review is focused on the incorporation of nanotechnological applications, in particular exploring the possibilities of a more effective way of administration, especially in selenium-deficient organisms. In addition, this review summarizes the survey of knowledge on selenium nanoparticles, their biological effects in the organism, advantages, absorption mechanisms, and nanotechnological applications for peroral administration.
- MeSH
- aplikace orální MeSH
- lékové transportní systémy metody MeSH
- lidé MeSH
- nanočástice aplikace a dávkování chemie MeSH
- nanomedicína metody MeSH
- nanotechnologie MeSH
- potravinářské přísady aplikace a dávkování chemie MeSH
- selen aplikace a dávkování farmakokinetika MeSH
- střevní sliznice účinky léků MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- přehledy MeSH
The aim of this study was to evaluate the influence of arsenic and bromine exposure with or without iodine and selenium supplementation on the element level in the thyroid of rats. Four major groups of Wistar female rats were fed with respective diets: group A - standard diet, group B - iodine rich diet (10 mg I/kg food), group C - selenium rich diet (1 mg Se/kg) and group D - iodine and selenium rich diet (as in group B and C). Each group was divided into four subgroups per 7 animals each receiving either NaAsO(2) ip (6.5 mg.kg(-1) twice a week for two weeks and 3.25 mg.kg(-1) for six weeks) or KBr in drinking water (58.8 mg.l(-1)) for 8 weeks or combined administration of both substances. Remaining subgroup served as controls. After 8 weeks thyroid glands were analyzed by ICP-MS for As, Br, Se, and I content. The exposition of rat to arsenic or bromine causes the accumulation of these elements in the thyroid gland ( approximately 18 ppm of As, approximately 90 ppm of Br) and significantly affects iodine and selenium concentration in the thyroid. In iodine and/or selenium supplemented rats the bromine intake into the thyroid was lowered to approximately 50% of the level in unsupplemented animals. Also selenium thyroid level elevated due to KBr administration was lowered by iodine supplementation in the diet. The accumulation of arsenic in the thyroid was not influenced by selenium or iodine supplementation; however, As(III) administration increased iodine thyroid level and suppressed selenium thyroid level in selenium or iodine supplemented group of animals.
- MeSH
- arsen aplikace a dávkování farmakokinetika MeSH
- brom aplikace a dávkování farmakokinetika MeSH
- jod aplikace a dávkování farmakokinetika MeSH
- krysa rodu rattus MeSH
- potkani Wistar MeSH
- selen aplikace a dávkování farmakokinetika MeSH
- štítná žláza metabolismus MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- MeSH
- chelátory farmakologie MeSH
- kyselina dimerkaptojantarová farmakologie MeSH
- lidé MeSH
- modely u zvířat MeSH
- potkani Wistar MeSH
- rtuť analýza farmakokinetika moč MeSH
- selen farmakokinetika MeSH
- Check Tag
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- srovnávací studie MeSH
The exposure of man to isolated toxic agent in the environment is rather a rare phenomenon. Therefore the study of a combined action of toxic substances is of increasing importance. The excretion and distribution of 74As (500 micrograms As.kg-1 b.wt.; Na74AsO2) and 75Se (525 micrograms Se.kg-1 b.wt.; Na275SeO3) was studied in rats after their separate and simultaneous i.v. injections. After simultaneous administration urinary as well as biliary excretion of 75Se and urinary excretion of 74As was increased in comparison with that in animals injected the radionuclides separately. Simultaneous administration of 74As and 75Se decreased concentration of 75Se in liver and increased concentration of 74As in kidney. In rats drinking water containing As (III) (0.66 mmol.l-1), Se(IV) (0.13 mmol.l-1) or combination As(III) + Se(IV) (at the same concentrations) for 7 or 28 days was studied the excretion and distribution of 74As and 75Se after their simultaneous i.v. injection (at the same concentrations and labelled compounds as mentioned above). The pretreatment with one element or with the combination of both elements significantly modified the distribution and excretion of subsequently administered 74As and 75Se.
- MeSH
- arsen farmakokinetika toxicita MeSH
- inbrední kmeny potkanů MeSH
- krysa rodu rattus MeSH
- lékové interakce MeSH
- radioizotopy selenu MeSH
- radionuklidy MeSH
- selen farmakokinetika toxicita MeSH
- tělesná hmotnost účinky léků MeSH
- tkáňová distribuce MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
