PMID- 10485844 OWN - NLM STAT- MEDLINE DCOM- 19991012 LR - 20190516 IS - 0890-9369 (Print) IS - 0890-9369 (Linking) VI - 13 IP - 17 DP - 1999 Sep 1 TI - Twist is a potential oncogene that inhibits apoptosis. PG - 2207-17 AB - Oncogene activation increases susceptibility to apoptosis. Thus, tumorigenesis must depend, in part, on compensating mutations that protect from programmed cell death. A functional screen for cDNAs that could counteract the proapoptotic effects of the myc oncogene identified two related bHLH family members, Twist and Dermo1. Both of these proteins inhibited oncogene- and p53-dependent cell death. Twist expression bypassed p53-induced growth arrest. These effects correlated with an ability of Twist to interfere with activation of a p53-dependent reporter and to impair induction of p53 target genes in response to DNA damage. An underlying explanation for this observation may be provided by the ability of Twist to reduce expression of the ARF tumor suppressor. Thus, Twist may affect p53 indirectly through modulation of the ARF/MDM2/p53 pathway. Consistent with a role as a potential oncoprotein, Twist expression promoted colony formation of E1A/ras-transformed mouse embryo fibroblasts (MEFs) in soft agar. Furthermore, Twist was inappropriately expressed in 50% of rhabdomyosarcomas, a tumor that arises from skeletal muscle precursors that fail to differentiate. Twist is known to block myogenic differentiation. Thus, Twist may play multiple roles in the formation of rhabdomyosarcomas, halting terminal differentiation, inhibiting apoptosis, and interfering with the p53 tumor-suppressor pathway. FAU - Maestro, R AU - Maestro R AD - Experimental Oncology 1, Centro di Riferimento Oncologico, 33081 Aviano, Italy. FAU - Dei Tos, A P AU - Dei Tos AP FAU - Hamamori, Y AU - Hamamori Y FAU - Krasnokutsky, S AU - Krasnokutsky S FAU - Sartorelli, V AU - Sartorelli V FAU - Kedes, L AU - Kedes L FAU - Doglioni, C AU - Doglioni C FAU - Beach, D H AU - Beach DH FAU - Hannon, G J AU - Hannon GJ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Genes Dev JT - Genes & development JID - 8711660 RN - 0 (Nuclear Proteins) RN - 0 (Repressor Proteins) RN - 0 (TWIST1 protein, human) RN - 0 (TWIST2 protein, human) RN - 0 (Transcription Factors) RN - 0 (Tumor Suppressor Protein p53) RN - 0 (Twist-Related Protein 1) RN - 0 (Twist2 protein, mouse) SB - IM MH - Animals MH - *Apoptosis MH - Cell Division MH - Cell Line MH - Cell Transformation, Neoplastic MH - Fibroblasts MH - Gene Deletion MH - Genes, myc MH - Genes, p53 MH - Genes, ras MH - Helix-Loop-Helix Motifs MH - Humans MH - Mice MH - *Nuclear Proteins MH - *Oncogenes MH - Rats MH - *Repressor Proteins MH - Rhabdomyosarcoma/genetics MH - Transcription Factors/genetics/*metabolism MH - Tumor Suppressor Protein p53/metabolism MH - Twist-Related Protein 1 PMC - PMC317004 EDAT- 1999/09/15 00:00 MHDA- 1999/09/15 00:01 CRDT- 1999/09/15 00:00 PHST- 1999/09/15 00:00 [pubmed] PHST- 1999/09/15 00:01 [medline] PHST- 1999/09/15 00:00 [entrez] AID - 10.1101/gad.13.17.2207 [doi] PST - ppublish SO - Genes Dev. 1999 Sep 1;13(17):2207-17. doi: 10.1101/gad.13.17.2207.