PMID- 9776301 OWN - NLM STAT- MEDLINE DCOM- 19981022 LR - 20211110 IS - 0006-2952 (Print) IS - 0006-2952 (Linking) VI - 56 IP - 8 DP - 1998 Oct 15 TI - Apoptotic, non-apoptotic, and anti-apoptotic pathways of tumor necrosis factor signalling. PG - 915-20 AB - Early events in the signalling of tumor necrosis factor-receptor 1 (TNF-R1), which is the main TNF receptor on most cell types, have been clarified recently. A multimolecular signal transducing complex from which several pathways originate rapidly forms upon TNF-induced aggregation of the receptor. Although fully capable of transducing apoptotic signals, which depend on the adapter Fas-associated death domain protein (FADD) and on the subsequent recruitment/activation of the apoptotic proteases, TNF-R1 usually does not kill cells; this is due to the induction of a complex cytoprotective response that requires TNF-receptor associated factor 2 (TRAF2), a signal transducer that couples TNF-R1 to both nuclear factor kappaB (NFkappaB)-dependent and NFkappaB-independent transcriptional events implicated in induction of genes protecting from TNF cytotoxicity. Although absolutely required for cytoprotection, TNF-receptor associated factor 2 is not sufficient to protect cells from TNF, thus suggesting that it may act in concert with additional TNF-R1 complex components. In this commentary, we will discuss some critical aspects of TNF-R1 signal transduction that are not fully understood: Why do cells not die before the protective protein synthesis has occurred? What are the mechanisms implicated in the termination of each TNF-R1-elicited response? Are there regulatory mechanisms capable of influencing the composition of the TNF-R1 complex and, consequently, the propagation of specific signals? FAU - Natoli, G AU - Natoli G AD - Fondazione Andrea Cesalpino and Istituto I Clinica Medica, Universita degli Studi di Roma La Sapienza, Rome, Italy. levmax@mix.it FAU - Costanzo, A AU - Costanzo A FAU - Guido, F AU - Guido F FAU - Moretti, F AU - Moretti F FAU - Levrero, M AU - Levrero M LA - eng PT - Journal Article PT - Review PL - England TA - Biochem Pharmacol JT - Biochemical pharmacology JID - 0101032 RN - 0 (Antigens, CD) RN - 0 (Arabidopsis Proteins) RN - 0 (Plant Proteins) RN - 0 (Proteins) RN - 0 (Receptors, Tumor Necrosis Factor) RN - 0 (Receptors, Tumor Necrosis Factor, Type I) RN - 0 (TNF Receptor-Associated Factor 2) RN - 0 (Tumor Necrosis Factor-alpha) RN - EC 1.14.19.- (Fatty Acid Desaturases) RN - EC 1.14.99.- (Fad7 protein, Arabidopsis) SB - IM MH - Animals MH - Antigens, CD/*physiology MH - Apoptosis/*physiology MH - *Arabidopsis Proteins MH - Cell Death/physiology MH - Cytoprotection MH - Fatty Acid Desaturases/physiology MH - Humans MH - Plant Proteins/physiology MH - Proteins/physiology MH - Receptors, Tumor Necrosis Factor/*physiology MH - Receptors, Tumor Necrosis Factor, Type I MH - Signal Transduction/*physiology MH - TNF Receptor-Associated Factor 2 MH - Tumor Necrosis Factor-alpha/*physiology RF - 49 EDAT- 1998/10/17 00:00 MHDA- 1998/10/17 00:01 CRDT- 1998/10/17 00:00 PHST- 1998/10/17 00:00 [pubmed] PHST- 1998/10/17 00:01 [medline] PHST- 1998/10/17 00:00 [entrez] AID - S0006-2952(98)00154-3 [pii] AID - 10.1016/s0006-2952(98)00154-3 [doi] PST - ppublish SO - Biochem Pharmacol. 1998 Oct 15;56(8):915-20. doi: 10.1016/s0006-2952(98)00154-3.