PMID- 18266951 OWN - NLM STAT- MEDLINE DCOM- 20090402 LR - 20211020 IS - 1582-1838 (Print) IS - 1582-4934 (Electronic) IS - 1582-1838 (Linking) VI - 12 IP - 6A DP - 2008 Dec TI - Nerve growth factor blocks thapsigargin-induced apoptosis at the level of the mitochondrion via regulation of Bim. PG - 2482-96 LID - 10.1111/j.1582-4934.2008.00268.x [doi] AB - This study examined how the neurotrophin, nerve growth factor (NGF), protects PC12 cells against endoplasmic reticulum (ER) stress-induced apoptosis. ER stress was induced using thapsigargin (TG) that inhibits the sarcoplasmic/ER Ca2+-ATPase pump (SERCA) and depletes ER Ca2+ stores. NGF pre-treatment inhibited translocation of Bax to the mitochondria, loss of mitochondrial transmembrane potential, cytochrome c release, activation of caspases (-3, -7 and -9) and apoptosis induction by TG. Notably, TG also caused a marked induction of BimEL mRNA and protein, and knockdown of Bim with siRNA protected cells against TG-induced apoptosis. NGF delayed the induction and increased the phosphorylation of BimEL. NGF-mediated protection was dependent on phosphatidylinositol-3 kinase (PI3K) signalling since all above apoptotic events, including expression and phosphorylation status of BimEL protein, could be reverted by the PI3K inhibitor LY294002. In contrast, NGF had no effect on the TG-mediated induction of the unfolded protein response (increased expression of Grp78, GADD34, splicing of XBP1 mRNA) or ER stress-associated pro-apoptotic responses (induction of C/EBP homologous protein [CHOP], induction and processing of caspase-12). These data indicate that NGF-mediated protection against ER stress-induced apoptosis occurs at the level of the mitochondria by regulating induction and activation of Bim and mitochondrial translocation of Bax. FAU - Szegezdi, E AU - Szegezdi E AD - Department of Biochemistry, National University of Ireland, Galway, Ireland. FAU - Herbert, K Reed AU - Herbert KR FAU - Kavanagh, E T AU - Kavanagh ET FAU - Samali, A AU - Samali A FAU - Gorman, A M AU - Gorman AM LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20080205 PL - England TA - J Cell Mol Med JT - Journal of cellular and molecular medicine JID - 101083777 RN - 0 (Apoptosis Regulatory Proteins) RN - 0 (Bax protein, rat) RN - 0 (Bcl-2-Like Protein 11) RN - 0 (Bcl2l11 protein, rat) RN - 0 (DNA Primers) RN - 0 (Membrane Proteins) RN - 0 (Proto-Oncogene Proteins) RN - 0 (RNA, Messenger) RN - 0 (RNA, Small Interfering) RN - 0 (bcl-2-Associated X Protein) RN - 67526-95-8 (Thapsigargin) RN - 9061-61-4 (Nerve Growth Factor) RN - EC 2.7.1.- (Phosphatidylinositol 3-Kinases) RN - EC 3.4.22.- (Casp12 protein, rat) RN - EC 3.4.22.- (Caspase 12) SB - IM MH - Animals MH - Apoptosis/*drug effects/genetics/physiology MH - Apoptosis Regulatory Proteins/antagonists & inhibitors/genetics/*metabolism MH - Base Sequence MH - Bcl-2-Like Protein 11 MH - Biological Transport, Active/drug effects MH - Caspase 12/metabolism MH - DNA Primers/genetics MH - Endoplasmic Reticulum/drug effects/metabolism MH - Membrane Proteins/antagonists & inhibitors/genetics/*metabolism MH - Mitochondria/drug effects/metabolism MH - Models, Biological MH - Nerve Growth Factor/*pharmacology MH - PC12 Cells MH - Phosphatidylinositol 3-Kinases/metabolism MH - Protein Folding/drug effects MH - Proto-Oncogene Proteins/antagonists & inhibitors/genetics/*metabolism MH - RNA, Messenger/genetics/metabolism MH - RNA, Small Interfering/genetics MH - Rats MH - Signal Transduction/drug effects MH - Stress, Physiological/drug effects MH - Thapsigargin/*antagonists & inhibitors/pharmacology MH - bcl-2-Associated X Protein/metabolism PMC - PMC4514125 EDAT- 2008/02/13 09:00 MHDA- 2009/04/03 09:00 PMCR- 2008/12/01 CRDT- 2008/02/13 09:00 PHST- 2008/02/13 09:00 [pubmed] PHST- 2009/04/03 09:00 [medline] PHST- 2008/02/13 09:00 [entrez] PHST- 2008/12/01 00:00 [pmc-release] AID - JCMM268 [pii] AID - 10.1111/j.1582-4934.2008.00268.x [doi] PST - ppublish SO - J Cell Mol Med. 2008 Dec;12(6A):2482-96. doi: 10.1111/j.1582-4934.2008.00268.x. Epub 2008 Feb 5.