PMID- 12743373 OWN - NLM STAT- MEDLINE DCOM- 20030716 LR - 20181113 IS - 0027-8424 (Print) IS - 1091-6490 (Electronic) IS - 0027-8424 (Linking) VI - 100 IP - 11 DP - 2003 May 27 TI - Inhibition of p53-induced apoptosis without affecting expression of p53-regulated genes. PG - 6718-23 AB - Using DNA microarray and clustering of expressed genes we have analyzed the mechanism of inhibition of wild-type p53-induced apoptosis by the cytokine interleukin 6 (IL-6) and the calcium mobilizer thapsigargin (TG). Clustering analysis of 1,786 genes, the expression level of which changed after activation of wild-type p53 in the absence or presence of IL-6 or TG, showed that these compounds did not cause a general inhibition of the ability of p53 to up-regulate or down-regulate gene expression. Expression of various p53 targets implicated as mediators of p53-induced apoptosis was also not affected by IL-6 or TG. These compounds thus can bypass the effect of wild-type p53 on gene expression and inhibit apoptosis. IL-6 and TG activated different p53-independent pathways of gene expression that include up-regulation of antiapoptotic genes. IL-6 and TG also activated different differentiation-associated genes. The ability of compounds such as cytokines and calcium mobilizers to inhibit p53-mediated apoptosis without generally inhibiting gene expression regulated by p53 can facilitate tumor development and tumor resistance to radiation and chemotherapy in cells that retain wild-type p53. FAU - Lotem, Joseph AU - Lotem J AD - Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel. FAU - Gal, Hilah AU - Gal H FAU - Kama, Rachel AU - Kama R FAU - Amariglio, Ninette AU - Amariglio N FAU - Rechavi, Gideon AU - Rechavi G FAU - Domany, Eytan AU - Domany E FAU - Sachs, Leo AU - Sachs L FAU - Givol, David AU - Givol D LA - eng SI - GENBANK/AF067774 SI - RefSeq/NM_009735 GR - P01 CA065930/CA/NCI NIH HHS/United States GR - 5P01CA65930-06/CA/NCI NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. DEP - 20030512 PL - United States TA - Proc Natl Acad Sci U S A JT - Proceedings of the National Academy of Sciences of the United States of America JID - 7505876 RN - 0 (DNA Primers) RN - 0 (Interleukin-6) RN - 0 (Tumor Suppressor Protein p53) RN - 67526-95-8 (Thapsigargin) SB - IM MH - Apoptosis/*physiology MH - Base Sequence MH - Blotting, Western MH - Cell Differentiation MH - Cluster Analysis MH - DNA Primers MH - Gene Expression Regulation/drug effects/*physiology MH - Interleukin-6/physiology MH - Molecular Sequence Data MH - Oligonucleotide Array Sequence Analysis MH - Reverse Transcriptase Polymerase Chain Reaction MH - Thapsigargin/pharmacology MH - Tumor Cells, Cultured MH - Tumor Suppressor Protein p53/*physiology PMC - PMC164513 EDAT- 2003/05/14 05:00 MHDA- 2003/07/17 05:00 PMCR- 2003/11/27 CRDT- 2003/05/14 05:00 PHST- 2003/05/14 05:00 [pubmed] PHST- 2003/07/17 05:00 [medline] PHST- 2003/05/14 05:00 [entrez] PHST- 2003/11/27 00:00 [pmc-release] AID - 1031695100 [pii] AID - 1006718 [pii] AID - 10.1073/pnas.1031695100 [doi] PST - ppublish SO - Proc Natl Acad Sci U S A. 2003 May 27;100(11):6718-23. doi: 10.1073/pnas.1031695100. Epub 2003 May 12.