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Skany mózgu dwóch szczepów myszy wypijających znaczne ilości alkoholu ujawniły, że u zwierząt pozbawionych receptorów dopaminy DRD2 dochodzi do zmniejszenia objętości kory mózgowej i wzgórza. Oznacza to, że receptory DRD2 zabezpieczają przed uszkodzeniami mózgu przez alkohol.

Dr Foteini Delis, neuroanatom z Behavioral Neuropharmacology and Neuroimaging Lab w Brookhaven, przypomina, że już wcześniejsze odkrycia sugerowały, że receptory dopaminowe D2 chronią przed uzależniającym wpływem alkoholu.

W ramach najnowszego studium Amerykanie sprawdzali, jak spożycie alkoholu oddziałuje na ogólną objętość mózgu oraz objętość poszczególnych struktur/rejonów u zwykłych myszy oraz gryzoni z wyeliminowanym genem receptorów dopaminowych D2. Przez pół roku połowa każdej z grup piła czystą wodę, a reszta 20-procentowy etanol. Po upływie tego czasu mózg wszystkich zwierząt zbadano za pomocą rezonansu magnetycznego.

Okazało się, że przewlekłe spożycie alkoholu prowadziło do ogólnej atrofii mózgu, oraz zmniejszenia objętości kory i wzgórza, ale tylko u zwierząt z brakującymi receptorami DRD2. Jeden z członków zespołu, Peter Tanatos, podkreśla, że uszkodzenia mózgu przypominały te widywane u alkoholików, dlatego myszy stanowią wiarygodny model badań. U ludzi te rejony mózgu są krytyczne dla przetwarzania mowy, danych czuciowych oraz sygnałów ruchowych, a także tworzenia długotrwałych wspomnień. Poziom DRD2 poniżej normy zwiększa jednostkową podatność na uszkadzające działanie alkoholu. Ponieważ oznacza on także podwyższone ryzyko uzależnienia, staje się jasne, że to układ dopaminergiczny powinien się stać przedmiotem badań nad istotą i leczeniem alkoholizmu.

Źródło: kopalniawiedzy.pl

Komentarzy: 107 w artykule: ”Receptory dopaminowe D2 chronią przed uszkodzeniem mózgu przez alkohol”

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