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Year : 2015  |  Volume : 9  |  Issue : 4  |  Page : 288-300

Republished: Sulphur alters NFκB-p300 cross-talk in favour of p53-p300 to induce apoptosis in non-small cell lung carcinoma


1 Division of Molecular Medicine, Bose Institute, P1/12, CIT Scheme VIIM, Kolkata, India
2 Central Council for Research in Homoeopathy, 61-65 Institutional Area, Janakpuri, New Delhi, India
3 Bholanath Chakrabarty Trust, 5 Subol Koley Lane, Howrah, India

Correspondence Address:
Gaurisankar Sa
Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700 054
India
Tanya Das
Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700 054
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-7168.172876

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Adverse side effects of chemotherapy during cancer treatment have shifted considerable focus towards therapies that are not only targeted but are also devoid of toxic side effects. We evaluated the antitumorigenic activity of sulphur, and delineated the molecular mechanisms underlying sulphurinduced apoptosis in non-small cell lung carcinoma (NSCLC) cells. A search for the underlying mechanism revealed that the choice between the two cellular processes, NFκBp65-mediated survival and p53-mediated apoptosis, was decided by the competition for a limited pool of transcriptional coactivator protein p300 in NSCLC cells. In contrast, sulphur inhibited otherwise upregulated survival signaling in NSCLC cells by perturbing the nuclear translocation of p65NFκB, its association with p300 histone acetylase, and subsequent transcription of Bcl-2. Under such anti-survival condition, induction of p53-p300 cross-talk enhanced the transcriptional activity of p53 and intrinsic mitochondrial death cascade. Overall, the findings of this preclinical study clearly delineated the molecular mechanism underlying the apoptogenic effect of the non-toxic homeopathic remedy, sulphur, in NSCLC cells.


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