Title : Simultaneous modulation of COX-2, p300, Akt, and Apaf-1 signaling by melatonin to inhibit proliferation and induce apoptosis in breast cancer cells.

Pub. Date : 2012 Aug

PMID : 22335196






7 Functional Relationships(s)
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1 Simultaneous modulation of COX-2, p300, Akt, and Apaf-1 signaling by melatonin to inhibit proliferation and induce apoptosis in breast cancer cells. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens
2 The observed suppression of proliferation was accompanied by the melatonin-mediated inhibition of COX-2, p300, and NF-kappaB signaling. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens
3 Melatonin significantly inhibited COX-2 expression and prostaglandin E(2) (PGE2) production, abrogated p300 histone acetyltransferase activity and p300-mediated NF-kappaB acetylation, thereby blocking NF-kappaB binding and p300 recruitment to COX-2 promoter. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens
4 Melatonin significantly inhibited COX-2 expression and prostaglandin E(2) (PGE2) production, abrogated p300 histone acetyltransferase activity and p300-mediated NF-kappaB acetylation, thereby blocking NF-kappaB binding and p300 recruitment to COX-2 promoter. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens
5 Pretreatment with a COX-2- or p300-selective inhibitor abrogated the melatonin-induced inhibition of cell proliferation, whereas PGE2 treatment or COX-2 transfection reversed the inhibition by melatonin. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens
6 Pretreatment with a COX-2- or p300-selective inhibitor abrogated the melatonin-induced inhibition of cell proliferation, whereas PGE2 treatment or COX-2 transfection reversed the inhibition by melatonin. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens
7 These results therefore indicate that melatonin inhibits cell proliferation and induces apoptosis in MDA-MB-361 breast cancer cells in vitro by simultaneously suppressing the COX-2/PGE2, p300/NF-kappaB, and PI3K/Akt/signaling and activating the Apaf-1/caspase-dependent apoptotic pathway. Melatonin mitochondrially encoded cytochrome c oxidase II Homo sapiens