Labdane type diterpenes down-regulate the expression of c-Myc protein, but not of Bcl-2, in human leukemia T-cells undergoing apoptosis

Leukemia Research
K DimasT Trangas

Abstract

Sclareol (1) and ent-3beta-hydroxy-13-epi-manoyl oxide (2) belong to the labdane type diterpenes. They were isolated from the leaves and from the fruits of Cistus creticus subsp. creticus, and were found to be active against human leukemic cell lines. Compound 2 was converted to its thiomidazolide derivative (3). Compounds 1 and 3 were found to induce apoptotic cell death in human T-cell leukemia lines and to interfere with their cell cycle, arresting cells at G(0/1) phase. Apoptosis can involve the activation and/or suppression of critical genes such as c-myc whose reduction or its inappropriate expression can be associated with induction of cell death and bcl-2 whose activation prevents apoptosis in the latter case. In order to detect any concomitant effect (1 and 3) upon c-myc and bcl-2 oncogene expression, we performed Western blot analysis to determine the levels of expression of these two genes upon treatment with the above compounds. Western blot analysis showed that of c-myc proto-oncogene levels were markedly reduced before massive apoptosis ensued in H33AJ-JA1 and MOLT3 cells, while bcl-2 expression remained unaffected. Thus, induction of apoptosis due to compounds 1 and 3 in these T-cell leukemic cell lines is preced...Continue Reading

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Citations

Jan 30, 2007·Apoptosis : an International Journal on Programmed Cell Death·Konstantinos DimasCostas Demetzos
Aug 13, 2011·Pharmaceutical Research·Volkmar Weissig
Nov 7, 2012·Natural Product Research·Burcu ÇulhaoğluGülaçtı Topçu
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Dec 11, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yollanda E M FrancoGiovanna B Longato

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