Interní Med. 2003; 5(7): 354-359

Zvýšení příjmu mikronutrientu selenu - utopie, fikce, prozřetelnost či nutnost? - II. část

RNDr. Jan Kvíčala CSc
Endokrinologický ústav, Praha

Keywords: selenium, antioxidative effect, immunity, thyroid hormone regulation, human health, selenium intervention, selenium status, serum selenium.

Published: December 31, 2003  Show citation

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Kvíčala J. Zvýšení příjmu mikronutrientu selenu - utopie, fikce, prozřetelnost či nutnost? - II. část. Interní Med. 2003;5(7):354-359.

V první části článku (Interní medicína pro praxi 2003; 6: 295-300) byly v krátkosti shrnuty biochemické reakce zpracování selenu v organizmu a jeho včlenění do selenoproteinů na základě genetické informace, z čehož vyplývá klasifikace selenocysteinu jako 21. aminokyseliny. Byly popsány dosud známé selenoproteiny s uvedením jejich funkce (je-li známa) a byl popsán vliv selenu, resp. jeho nedostatku na některé fyziologické a biochemické pochody, ovlivňující činnost a zdravotní stav organismu. Na základě funkcí selenoproteinů byl nastíněn možný vliv nedostatku selenu na kardiovaskulární choroby, reprodukci, virulenci a patogenicitu některých virů a rovněž vliv selenu na imunitní odezvu organizmu. V následujících odstavcích bude pokračovat popis efektů sloučenin selenu v organizmu uvedením jejich antikancerogenních účinků na různých úrovních (zde se autor bude odvolávat i na některé mechanizmy vyložené v 1. části), životně důležitou katalytickou činností dejodáz při tvorbě a degradaci thyreoidálních hormonů a budou shrnuty dosavadní víceméně empirické znalosti o působení selenu na psychiku. Možnosti určování stavu selenu v organizmu a stav selenu u populace ČR budou námětem posledního tematického okruhu spolu s uvedením možností intervence u celé populace i jednotlivců.

Increase of Micronutrient Selenium Intake - Dream, Fiction, Providence, Necessity? - part II

In the first part of the article (Interní medicína pro praxi 2003; 6: 295-300) there were shortly summarised biochemical pathways of selenium in the organism and incorporation of Se-cystein into selenoprotein as 21. aminoacid on the grounds of genetic information. The table of the known selenoproteins was included with the information about up to now known functions of selenium compounds. Influences of selenium and/or its deficiency on some physiological and biochemical pathways with the effect upon health status and function of organism were also mentioned, especially effect upon cardiovascular diseases, reproduction, pathogenicity of some viruses, and effect of selenium upon immune response. In this second part, carcinostatic effects of selenium compounds, catalytic activity of deiodinases in the metabolism and regulation of thyroid hormones, as well as less or more empirical knowledge on effect of selenium upon psychics will be discussed. Possibilities of the detection of selenium status indexes and selenium status of the population in the Czech Republic as well will be the topic of the last chapters of the article, together with the summary of intervention possibilities both on the whole population scale and for individuals.

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