vladimirchi , 26.04.2006 20:35
2,3,7,8 – Òåòðàõëîðäèáåíçî-ð-äèîêñèí (TCDD) è ðîäñòâåííûå åìó ãàëîãåíèçèðîâàííûå àðîìàòè÷åñêèå óãëåâîäîðîäû (HAH) âûñîêîòîêñè÷íû äëÿ áîëüøèíñòâà ïîçâîíî÷íûõ, îäíàêî îòäåëüíûå âèäû çíà÷èòåëüíî ðàçëè÷àþòñÿ ïî óñòîé÷èâîñòè. Òàê, äîìàøíÿÿ êóðèöà (Gallus gallus) ïî÷òè â 250 ðàç ÷óâñòâèòåëüíåå êðà÷êè (Sterna hirundo). Àâòîðû ðàáîòû (S.I. Karchner et al., PNAS 2006 103 (16) P. 6252-6257 www.pnas.org/cgi/content/full/103/16/6252 ) èçó÷èëè ìîëåêóëÿðíûå îñíîâû ýòèõ ðàçëè÷èé. Ìåõàíèçì òîêñè÷íîñòè HAH îñíîâàí íà ñèñòåìíîì íàðóøåíèè ýêñïðåññèè ãåíîâ âûçâàííîì àêòèâàöèåé ýòèìè âåùåñòâàìè îäíîãî èç òðàíñêðèïöèîííûõ ôàêòîðîâ – ðåöåïòîðà àðèë-óãëåâîäîðîäîâ (AHR). Áûëî îáíàðóæåíî, ÷òî AHR êóðèöû è êðà÷êè ðàçëè÷àþòñÿ ïî äâóì àìèíîêèñëîòíûì çàìåíàì, ðàñïîëîæåííûì â äîìåíå ñâÿçûâàíèÿ ñ äèîêñèíîì è åãî ðîäñòâåííèêàìè, ÷òî è îïðåäåëÿåò ðàçíóþ ñòåïåíü ñâÿçûâàíèÿ. Òàêèì îáðàçîì, ïîëó÷åí íàäåæíûé ìîëåêóëÿðíûé ìàðêåð äëÿ îöåíêè ÷óâñòâèòåëüíîñòè âèäîâ ê äèîêñèíàì áåç ïðîâåäåíèÿ æåñòîêèõ, ãðîìîçäêèõ è îïàñíûõ òîêñèêîëîãè÷åñêèõ òåñòîâ. Îñòàåòñÿ îòêðûòûì âîïðîñ î òîì, áûëè êðà÷êè ïðåàäàïòèðîâàíû ê õëîðîðãàíèêå «èñòîðè÷åñêè» èëè ýòà âèäîâàÿ îñîáåííîñòü âûðàáîòàëàñü çà íåñêîëüêî äåñÿòêîâ ëåò êîíòàêòà ñ «áîëüøîé õèìèåé»?êàòåãîðèÿ - 2
nigoal123 , 28.04.2022 11:48
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