Globálny slovník portálu IMED

Pojem: 
Extrakraniální radioterapie a radiochirurgie
Definícia: 

Extrakraniální stereotaktická radioterapie/radiochirurgie (SBRT – stereotactic body radiotherapy) využívá velmi přesné aplikace vysoké jednotlivé dávky záření v malém počtu frakcí. Díky stále lepší vybavenosti radioterapeutických pracovišť z hlediska možností obrazové navigace a fixace pacientů lze stereotaktický přístup využít prakticky ve všech anatomických lokalitách. S výhodou nalézá uplatnění zvláště při léčbě nádorových ložisek v plících, játrech, dutině břišní či pánvi a ve skeletu.

Kľúčové slovo: 
Radiochirurgie
Pojem: 
syndróm nedostatku testosterónu - TDS
Definícia: 

<div>TDS (testosterone deficiency syndrome) je definovan&yacute; ako klinick&yacute; a biochemick&yacute; syndr&oacute;m, ku ktor&eacute;mu doch&aacute;dza v procese starnutia mužov. Nedostatok testoster&oacute;nu u postihnut&yacute;ch mužov nepriaznivo vpl&yacute;va na funkcie viacer&yacute;ch org&aacute;nov&yacute;ch syst&eacute;mov. Vedie k podstatn&eacute;mu zhor&scaron;eniu kvality života. U mužov medzi 40 - 70 rokmi kles&aacute; biologicky akt&iacute;vny testoster&oacute;n v s&eacute;re približne o 1,2 % ročne.</div>

Pojem: 
Spolupráca endokrinológa a oftalmológa pri endokrinnej orbitopatii
Definícia: 

Práca sa venuje návodu, ako by mala vyzerať spolupráca oftalmológa s endokrinológom a zbytočným chybám, ku ktorým často zbytočne dochádza.

Kľúčové slovo: 
hrúbka extraokulárnych svalov
vnútroočný tlak
epidemiologické faktory
Endokrinná orbitopatia
farebná dopplerovská ultrasonografia
Pojem: 
Epithelial-mesenchymal transition (EMT) – epiteliálno-mezenchymálny prechod
Definícia: 

<p>
<pre>je fyziologick&yacute; proces prebiehaj&uacute;ci v embryogen&eacute;ze a pri hojen&iacute; r&aacute;n. Prejavuje sa aj v patologick&yacute;ch procesoch tumorigen&eacute;zy, ako s&uacute; inici&aacute;cia
a progresia n&aacute;dorov. Z&aacute;kladnou vlastnosťou EMT je strata epitelovej morfol&oacute;gie bunky a z&iacute;skanie vlastnost&iacute;, ktor&eacute; s&uacute; podobn&eacute; fibroblastom. Je
to sp&ocirc;soben&eacute; najm&auml; zn&iacute;ženou expresiou E-kadher&iacute;nu v d&ocirc;sledku aktiv&aacute;cie transkripčn&eacute;ho komplexu TCF/LEF s b-katen&iacute;nom, ako aj transkripčn&yacute;ch
faktorov Twist, Snai1, ZEB, ktor&yacute;ch aktivita koreluje s fenotypom kmeňov&yacute;ch buniek.</pre>
</p>

Kľúčové slovo: 
iniciácia a progresia nádorov
Pojem: 
Nasýtené mastné kyseliny (NMK)
Definícia: 

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<p class=\"MsoNormal\"><strong><span style=\"font-size: 12pt; line-height: 115%; font-family: &quot;Times New Roman&quot;,&quot;serif&quot;;\"><span></span></span></strong><span style=\"font-size: 12pt; line-height: 115%; font-family: &quot;Times New Roman&quot;,&quot;serif&quot;;\">maj&uacute; druh&yacute; najvy&scaron;&scaron;&iacute; aterog&eacute;nny potenci&aacute;l. NMK nie s&uacute; len v&nbsp;živoč&iacute;&scaron;nych tukoch (maslo 62 %, bravčov&aacute; masť 40 %), ale aj v&nbsp;niektor&yacute;ch rastlinn&yacute;ch tukoch (kokosov&yacute; a&nbsp;palmov&yacute; olej). Zatiaľ st&aacute;le ch&yacute;ba legislat&iacute;va určuj&uacute;ca povinnosť v&yacute;robcu jasne deklarovať množstvo TFMK a&nbsp;NMK v&nbsp;potravin&aacute;ch.</span></p>

Kľúčové slovo: 
aterogénny potenciál
Pojem: 
Primárna biliárna cirhóza
Definícia: 

Chronické cholestatické ochorenie pečene, ktoré postihuje prevažne ženy v strednom veku. Patrí medzi orgánovo-špecifické autoimunitné ochorenia. Presná etiológia nie je známa, ale rozhodujúcu úlohu zohrávajú antimitochondriálne protilátky. Pre definitívnu diagnózu PBC musia byť splnené 3 diagnostické kritériá, t.j. AMA pozitivita, cholestáza a histologický obraz. Prirodzený priebeh ochorenia je veľmi variabilný. Mnoho pacientov má súčasne aj iné autoimunitné ochorenie, napr. Sjögrenov syndróm, reumatoidnú artritídu, ochorenia štítnej žľazy, celiakiu.

Pojem: 
Antigén
Definícia: 

<p>Antig&eacute;n je l&aacute;tka (najčastej&scaron;ie bielkovina alebo zložit&yacute; polysacharid), ktor&aacute; je schopn&aacute; v organizme navodiť imunitn&uacute; odpoveď (vr&aacute;tane tvorby protil&aacute;tok). Z pohľadu laborat&oacute;rnej s&eacute;rologickej diagnostiky je antig&eacute;nom l&aacute;tka, ktor&aacute; reaguje s protil&aacute;tkou in vitro. Pre navodenie imunitnej odpovede je obvykle potrebn&aacute; cel&aacute; veľk&aacute; molekula, hoci. s antig&eacute;nom reaguje len jeho mal&aacute; zložka (epitop).<br /><br /></p>

Kľúčové slovo: 
antigén
Pojem: 
Antigénový epitop
Definícia: 

<p>Obvykle &uacute;sek bielkoviny (peptid), ktor&yacute; je rozpoznan&yacute; antig&eacute;n viaž&uacute;cim determinantom protil&aacute;tky. V organizme je antig&eacute;n pohlten&yacute; fagocytmi (antig&eacute;n prezentuj&uacute;ce bunky), ktor&eacute; pripravia z celej molekuly antig&eacute;nu vlastn&yacute; epitop. Ten, aby mohol byť ropoznan&yacute; receptormi buniek imunitn&eacute;ho syst&eacute;mu (T lymfocyty alebo B lymfocyty), mus&iacute; byť nadviazan&yacute; na pomocn&uacute; molekulu HLA (pozri heslo).&nbsp;</p>

Kľúčové slovo: 
antigénový epitop
Pojem: 
ANA (antinuclear antibody), antinukleárna protilátka
Definícia: 

<p>ANA s&uacute; protil&aacute;tky proti niektor&yacute;m prote&iacute;nom, respekt&iacute;ve ribonukleoprote&iacute;nom, ale aj proti dsDNA alebo na ňu nadvazan&yacute;m prote&iacute;nom, ktor&eacute; sa v jadre buniek (nukleoplazme).st&aacute;vaj&uacute; terčov&yacute;mi antig&eacute;nmi. Najd&ocirc;ležitej&scaron;ie prote&iacute;ny, s ktor&yacute;mi ANA reaguj&uacute;, s&uacute; zoraden&eacute; v tabuľke 7. Tabuľka s&uacute;časne pod&aacute;va z&aacute;kladn&uacute; charakteristiku ich fyziologick&yacute;ch funkci&iacute;.</p>

Kľúčové slovo: 
antinukleárna protilátka
Pojem: 
autoprotilátka
Definícia: 

<p>Autoprotil&aacute;tka je protil&aacute;tka rozpozn&aacute;vaj&uacute;ca telu vlastn&yacute; antig&eacute;n (ako keby bol cudzorod&yacute;, non-self). V zdravom organizme (za fyziologick&yacute;ch podmienok) sa autoprotil&aacute;tky proti telu vlastn&yacute;m antig&eacute;nom (self) nevyskytuj&uacute; v&ocirc;bec, alebo aspoň nie v množstve, ktor&eacute; by mohlo po&scaron;kodiť vlastn&eacute; bunky a org&aacute;ny.</p>

Kľúčové slovo: 
autoprotilátka
Pojem: 
Dvojvláknová DNA (dsDNA, double strand DNA
Definícia: 

<p>Dvojit&aacute; z&aacute;vitnica DNA (deoxyribonukleovej kyseliny), skratka dsDNA, je tvoren&aacute; dvomi komplement&aacute;rnymi molekulami jednovl&aacute;knovej DNA (ssDNA) na princ&iacute;pe p&aacute;rovania b&aacute;z jej nukleotidov (A oproti T, C oproti G, G oproti C a T oproti A). Každ&eacute; z oboch vl&aacute;ken je zoradn&eacute; z nukleotidov, ktor&eacute; smeruj&uacute; proti sebe v opačnom porad&iacute;. Cukorn&aacute; zložka (deoxyrib&oacute;za) nukleotidov, ktor&aacute; je viazan&aacute; na jednotliv&eacute;, b&aacute;zy je vždy rovnak&aacute;.&nbsp;</p>

Kľúčové slovo: 
dsDNA
Pojem: 
ELISA (enzyme linked immunosorbent assay)
Definícia: 

<p>Met&oacute;da detekcie protil&aacute;tok pomocou antig&eacute;nu, prichyten&eacute;ho na jednotliv&eacute; jamky mikrotitračnej dostičky. Po aplik&aacute;cii testovan&eacute;ho s&eacute;ra (do každej jamky in&eacute; s&eacute;rum vč&iacute;tane rozličn&yacute;ch kontrol) a jeho d&ocirc;kladnom odmyt&iacute; sa aplikuje enz&yacute;mom označen&aacute; protil&aacute;tka a napokon substr&aacute;t sl&uacute;žiaci pre detekciu enz&yacute;mu. V&yacute;sledok reakcie sa odč&iacute;ta v &scaron;peci&aacute;lnom spektrofotometri (ELISA reader), na z&aacute;klade optickej denzity roztoku v jamke, ktor&aacute; je &uacute;mern&aacute; pr&iacute;tomnosti antig&eacute;nu.</p>

Kľúčové slovo: 
ELISA
Pojem: 
HLA (human leukocyte antigen)
Definícia: 

<p>
<p>Kateg&oacute;ria molek&uacute;l na povrchu buniek u ľud&iacute;, podieľaj&uacute;ca sa na imunitnom rozpozn&aacute;van&iacute; antig&eacute;nu (molekuly HLA II, exorimuj&uacute; ho antig&eacute;n prezentuj&uacute;ce bunky), respekt&iacute;ve na cytotoxickej reakcii (molekuly HLA I na povrchu v&auml;č&scaron;iny buniek). Molekuly HLA nes&uacute; antig&eacute;nov&yacute; epitop, ktor&yacute; je sign&aacute;lom pre pr&iacute;slu&scaron;n&eacute; receptory T lymfocytov. Syt&eacute;m molek&uacute;l HLA u ľud&iacute; zodpoved&aacute; syst&eacute;mu molek&uacute;l hlavn&eacute;ho histokompatibiln&eacute;mu komplexu my&scaron;&iacute; (MHC, major histompatibility complex). Keďže aj samotn&eacute; molekuly HLA s&uacute; zložit&eacute; komplexy prote&iacute;nov, samy sa st&aacute;vaj&uacute; antig&eacute;nom v tele in&eacute;ho jedinca. To zaklad&aacute; problematiku antig&eacute;novej &scaron;pecifickosti medzi osobami, ktor&eacute; nie s&uacute; v rodinnom (s&uacute;rodeneckom) pomere.</p>
</p>

Kľúčové slovo: 
molekula HLA
Pojem: 
Imunoblot (IB, imunopijakovanie)
Definícia: 

<p>
<p>Zn&aacute;zornenie bielkov&iacute;n (antig&eacute;nov) prichyten&yacute;ch na nylonov&uacute; membr&aacute;nu. Po aplik&aacute;cii protil&aacute;tok, ktor&eacute; s antig&eacute;nom reaguj&uacute;, sa vytvor&iacute; precipit&aacute;t viditeľn&yacute; ako pr&uacute;žok na z&aacute;klade vizualizačnej proced&uacute;ry, založenej na podobnom princ&iacute;pe, ako pri reakcii ELISA. Prote&iacute;ny odli&scaron;nej hmotnosti, detegovan&eacute; dan&yacute;m s&eacute;rom, tvoria oddelen&eacute; pr&uacute;žky.</p>
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</p>

Kľúčové slovo: 
imunoblot
Pojem: 
Imunofluorescencia (IF)
Definícia: 

<p>Zn&aacute;zornenie antig&eacute;nov v bunk&aacute;ch alebo v tkanive pomocou protil&aacute;tok, označen&yacute;ch fluoreskuj&uacute;cimi l&aacute;tkami. Na detekciu ANA sa z&aacute;sadne vyžaduje nepriama met&oacute;da, ktor&aacute; využ&iacute;va označen&uacute; druh&uacute; protil&aacute;tku, reaguj&uacute;cu s pr&iacute;slu&scaron;n&yacute;m imunglobul&iacute;nom testovan&eacute;ho s&eacute;ra (IgG).&nbsp;</p>

Kľúčové slovo: 
imunofluorescencia

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