Změny v expresi TNFα a microRNA-15b u experimentálního modelu subarachnoidálního krvácení

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Autoři: J. Lipkova ¹; Z. Splichal ¹; Michal Jurajda ¹ ; T. Madaraszova ²; A. Vasku ¹; M. Smrcka ²; K. Duris ^1,2
Vyšlo v časopise: Cesk Slov Neurol N 2019; 82(1): 53-59
Kategorie: Původní práce
doi: https://doi.org/10.14735/amcsnn201953

Souhrn

Cíl:

Cílem studie bylo prozkoumat změny v expresi pro-zánětlivého a pro-apoptotického cytokinu tumor nekrotizující faktor alfa (TNFα) a mikroRNA (miRNA), které se podílejí na jeho regulaci v časném období po subarachnoidálním krvácení (SAK).

Soubor a metodika:

Exprese miRNA (miR-125b, miR-146a, miR-346, miR-155, miR-15b) a mRNA (TNFα) byly stanoveny pomocí kvantitativní polymerázové řetězové reakce v reálném čase z mozkové tkáně experimentálních zvířat. Celkem 88 zvířat bylo rozděleno do skupin Sham (kontrolní operace bez indukce SAK), Lehké SAK, Těžké SAK, do časových intervalů 2, 4, 6 a 8 h (n = 7 ve skupině); 4 zvířata byla použita jako absolutní kontrola.

Výsledky:

Byly nalezeny statisticky významné rozdíly v expresi TNFα mezi skupinami Sham a Těžké SAK ve všech zkoumaných časových intervalech (p < 0,05), dále mezi skupinami Sham a Lehké SAK 4 h po indukci SAK (p < 0,05) a mezi skupinami Lehké SAK a Těžké SAK ve 2 a 6h časovém intervalu (p < 0,05). Dále byl pozorován významný rozdíl v expresi miRNA-15b mezi skupinami Sham a Těžké SAK 8 h po začátku SAK (p < 0,05). U dalších analyzovaných miRNA jsme v expresi nepozorovali žádné statisticky významné změny.

Závěr:

SAK bylo asociováno s časným nárůstem exprese TNFα a miR-15b, zejména u skupiny Těžké SAK. Navzdory komplexitě vzájemné regulace mezi cytokiny a mikroRNA, může informace o časné aktivaci zánětlivých/ apoptotických mechanismů několik hodin po SAK přispět k lepšímu poznání patofyziologie SAK. Pochopení mechanismů vzájemné regulace proapoptotických markerů TNFα a miR-15b může přispět ke zlepšení terapie této závažné patologie.

Klíčová slova:

subarachnoidální krvácení – časné poškození mozku – zánět – apoptóza – mikroRNA – perforační model

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