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Chung K, Ullah I, Yi Y, Kang E, Yun G, Heo S, Kim M, Chung SE, Park S, Lim J, Lee M, Rhim T, Lee SK. Intranasal Delivery of Anti-Apoptotic siRNA Complexed with Fas-Signaling Blocking Peptides Attenuates Cellular Apoptosis in Brain Ischemia. Pharmaceutics 2024; 16:290. [PMID: 38399343 PMCID: PMC10892455 DOI: 10.3390/pharmaceutics16020290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/15/2024] [Accepted: 02/16/2024] [Indexed: 02/25/2024] Open
Abstract
Ischemic stroke-induced neuronal cell death leads to the permanent impairment of brain function. The Fas-mediating extrinsic apoptosis pathway and the cytochrome c-mediating intrinsic apoptosis pathway are two major molecular mechanisms contributing to neuronal injury in ischemic stroke. In this study, we employed a Fas-blocking peptide (FBP) coupled with a positively charged nona-arginine peptide (9R) to form a complex with negatively charged siRNA targeting Bax (FBP9R/siBax). This complex is specifically designed to deliver siRNA to Fas-expressing ischemic brain cells. This complex enables the targeted inhibition of Fas-mediating extrinsic apoptosis pathways and cytochrome c-mediating intrinsic apoptosis pathways. Specifically, the FBP targets the Fas/Fas ligand signaling, while siBax targets Bax involved in mitochondria disruption in the intrinsic pathway. The FBP9R carrier system enables the delivery of functional siRNA to hypoxic cells expressing the Fas receptor on their surface-a finding validated through qPCR and confocal microscopy analyses. Through intranasal (IN) administration of FBP9R/siCy5 to middle cerebral artery occlusion (MCAO) ischemic rat models, brain imaging revealed the complex specifically localized to the Fas-expressing infarcted region but did not localize in the non-infarcted region of the brain. A single IN administration of FBP9R/siBax demonstrated a significant reduction in neuronal cell death by effectively inhibiting Fas signaling and preventing the release of cytochrome c. The targeted delivery of FBP9R/siBax represents a promising alternative strategy for the treatment of brain ischemia.
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Affiliation(s)
- Kunho Chung
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
- Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44106, USA
| | - Irfan Ullah
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
- Department of Internal Medicine, Yale University, New Haven, CT 06520, USA
| | - Yujong Yi
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Eunhwa Kang
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Gyeongju Yun
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Seoyoun Heo
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Minkyung Kim
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Seong-Eun Chung
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Seongjun Park
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Jaeyeoung Lim
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Minhyung Lee
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Taiyoun Rhim
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
| | - Sang-Kyung Lee
- Department of Bioengineering and Institute of Nanoscience and Technology, Hanyang University, Seoul 04763, Republic of Korea; (K.C.); (Y.Y.); (S.H.)
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Kagan T, Stoyanova G, Lockshin RA, Zakeri Z. Ceramide from sphingomyelin hydrolysis induces neuronal differentiation, whereas de novo ceramide synthesis and sphingomyelin hydrolysis initiate apoptosis after NGF withdrawal in PC12 Cells. Cell Commun Signal 2022; 20:15. [PMID: 35101031 PMCID: PMC8802477 DOI: 10.1186/s12964-021-00767-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 07/17/2021] [Indexed: 01/03/2023] Open
Abstract
Background Ceramide, important for both neuronal differentiation and dedifferentiation, resides in several membranes, is synthesized in the endoplasmic reticulum, mitochondrial, and nuclear membranes, and can be further processed into glycosphingolipids or sphingomyelin. Ceramide may also be generated by hydrolysis of sphingomyelin by neutral or acidic sphingomyelinases in lysosomes and other membranes. Here we asked whether the differing functions of ceramide derived from different origins. Methods We added NGF to PC12 cells and to TrkA cells. These latter overexpress NGF receptors and are partially activated to differentiate, whereas NGF is required for PC12 cells to differentiate. We differentiated synthesis from hydrolysis by the use of appropriate inhibitors. Ceramide and sphingomyelin were measured by radiolabeling. Results When NGF is added, the kinetics and amounts of ceramide and sphingomyelin indicate that the ceramide comes primarily from hydrolysis but, when hydrolysis is inhibited, can also come from neosynthesis. When NGF is removed, the ceramide comes from both neosynthesis and hydrolysis. Conclusion We conclude that the function of ceramide depends heavily on its intracellular location, and that further understanding of its function will depend on resolving its location during changes of cell status. Graphical Abstract ![]()
Video Abstract
Supplementary Information The online version contains supplementary material available at 10.1186/s12964-021-00767-2. Ceramide and sphingomyelin reportedly are important both for differentiation of nerve cells and for their death. We studied PC12 cells, which can differentiate into neuron-like cells in the presence of nerve growth factor and cells that overexpress receptors for nerve growth factor. By combining various inhibitors, we conclude that in the presence of nerve growth factor ceramide comes from hydrolysis of sphingomyelin, but when nerve growth factor is removed and the cells atrophy and die, sphingomyelin comes from both neosynthesis and hydrolysis.
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Affiliation(s)
- Terri Kagan
- Department of Biology, Queens College of the City University of New York, Flushing, NY, USA
| | - Gloria Stoyanova
- Department of Biology, Queens College of the City University of New York, Flushing, NY, USA
| | - Richard A Lockshin
- Department of Biology, Queens College of the City University of New York, Flushing, NY, USA.,St. Johns University, Jamaica, NY, USA
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Guan X, Zhang H, Qin H, Chen C, Hu Z, Tan J, Zeng L. CRISPR/Cas9-mediated whole genomic wide knockout screening identifies mitochondrial ribosomal proteins involving in oxygen-glucose deprivation/reperfusion resistance. J Cell Mol Med 2020; 24:9313-9322. [PMID: 32618081 PMCID: PMC7417733 DOI: 10.1111/jcmm.15580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 05/18/2020] [Accepted: 06/13/2020] [Indexed: 01/06/2023] Open
Abstract
Recanalization therapy by intravenous thrombolysis or endovascular therapy is critical for the treatment of cerebral infarction. However, the recanalization treatment will also exacerbate acute brain injury and even severely threatens human life due to the reperfusion injury. So far, the underlying mechanisms for cerebral ischaemia-reperfusion injury are poorly understood and effective therapeutic interventions are yet to be discovered. Therefore, in the research, we subjected SK-N-BE(2) cells to oxygen-glucose deprivation/reperfusion (OGDR) insult and performed a pooled genome-wide CRISPR (clustered regularly interspaced short palindromic repeats)/Cas9 (CRISPR-associated protein 9) knockout screen to discover new potential therapeutic targets for cerebral ischaemia-reperfusion injury. We used Metascape to identify candidate genes which might involve in OGDR resistance. We found that the genes contributed to OGDR resistance were primarily involved in neutrophil degranulation, mitochondrial translation, and regulation of cysteine-type endopeptidase activity involved in apoptotic process and response to oxidative stress. We then knocked down some of the identified candidate genes individually. We demonstrated that MRPL19, MRPL32, MRPL52 and MRPL51 inhibition increased cell viability and attenuated OGDR-induced apoptosis. We also demonstrated that OGDR down-regulated the expression of MRPL19 and MRPL51 protein. Taken together, our data suggest that genome-scale screening with Cas9 is a reliable tool to analyse the cellular systems that respond to OGDR injury. MRPL19 and MRPL51 contribute to OGDR resistance and are supposed to be promising targets for the treatment of cerebral ischaemia-reperfusion damage.
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Affiliation(s)
- Xinjie Guan
- Center for Medical GeneticsSchool of Life SciencesCentral South UniversityChangshaHunanChina
- Hunan Key Laboratory of Medical GeneticsCentral South UniversityChangshaHunanChina
- Hunan Key Laboratory of Animal Model for Human DiseasesCentral South UniversityChangshaHunanChina
| | - Hainan Zhang
- Department of NeurologySecond Xiangya HospitalCentral South UniversityChangshaHunanChina
| | - Haiyun Qin
- Department of NeurologySecond Xiangya HospitalCentral South UniversityChangshaHunanChina
| | - Chunli Chen
- Department of NeurologySecond Xiangya HospitalCentral South UniversityChangshaHunanChina
| | - Zhiping Hu
- Department of NeurologySecond Xiangya HospitalCentral South UniversityChangshaHunanChina
| | - Jieqiong Tan
- Center for Medical GeneticsSchool of Life SciencesCentral South UniversityChangshaHunanChina
- Hunan Key Laboratory of Medical GeneticsCentral South UniversityChangshaHunanChina
- Hunan Key Laboratory of Animal Model for Human DiseasesCentral South UniversityChangshaHunanChina
| | - Liuwang Zeng
- Department of NeurologySecond Xiangya HospitalCentral South UniversityChangshaHunanChina
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Lu PW, Li L, Wang F, Gu YT. Inhibitory role of large intergenic noncoding RNA-ROR on tamoxifen resistance in the endocrine therapy of breast cancer by regulating the PI3K/Akt/mTOR signaling pathway. J Cell Physiol 2018; 234:1904-1912. [PMID: 30145819 DOI: 10.1002/jcp.27066] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Accepted: 06/25/2018] [Indexed: 12/31/2022]
Abstract
Breast cancer (BC) is the second-leading cause of central nervous system metastases among severe malignancies. This study aimed at investigating the underlying mechanism by which large intergenic noncoding RNA-regulator of reprogramming (lincRNA-ROR) affects the tamoxifen (TAM) resistance of BC cells by regulating the PI3K/Akt/mTOR signaling pathway. Immortalized human mammary epithelial cell line (MCF10A) and BC cell lines (MCF-7, MDA-MB-231, T47D, BCAP-37, and ZK-75-1) were cultured, and BC tissues and adjacent normal breast tissues were collected from 152 BC patients. LincRNA-ROR expression in tissues and cells were detected using reverse transcription quantitative polymerase chain reaction. RNA interference was used to silence lincRNA-ROR in MDA-MB-231 cells, and then the cell proliferation and apoptosis were detected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and annexin-V and propidium iodide (PI) double staining respectively. The expression of apoptosis-related proteins and PI3K/Akt/mTOR signaling pathway-related proteins was measured by performing western blot assay. The BC tissues and cells presented a higher expression of lincRNA-ROR. MAD-MB-231 cells exhibited the highest lincRNA-ROR expression. After lincRNA-ROR silencing, MAD-MB-231 cells showed decreased proliferation, and increased sensitivity to TAM. Besides, the apoptosis-promoting effect of TAM on MAN-MB-231 cells significantly increased. The expression of PI3K/Akt/mTOR signaling pathway-related proteins and the PI3K/Akt/mTOR signaling pathway were repressed by TAM after silencing lincRNA-ROR. Our study demonstrated that silencing lincRNA-ROR could increase the sensitivity of BC MAD-MB-231 cells to TAM by suppressing the activation of P13K/Akt/mTOR signaling pathway.
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Affiliation(s)
- Peng-Wei Lu
- Department of Breast Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Lin Li
- Department of Breast Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Fang Wang
- Department of Breast Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yuan-Ting Gu
- Department of Breast Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Xifró X, Rodríguez-Álvarez J. Delineating the factors and cellular mechanisms involved in the survival of cerebellar granule neurons. THE CEREBELLUM 2016; 14:354-9. [PMID: 25596943 DOI: 10.1007/s12311-015-0646-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cerebellar granule neurons (CGNs) constitute the most abundant neuronal population in the mammalian brain. Their postnatal generation and the feasibility to induce their apoptotic death in vitro make them an excellent model to study the effect of several neurotransmitters and neurotrophins. Here, we first review which factors are involved in the generation and proliferation of CGNs in the external granule layer (EGL) and in the regulation of their differentiation and migration to internal granule layer (IGL). Special attention was given to the role of several neurotrophins and the NMDA subtype of glutamate receptor. Then, using the paradigm of potassium deprivation in cultured CGNs, we address several extracellular factors that promote the survival of CGNs, with particular emphasis on the cellular mechanisms. The role of specific protein kinases leading to the regulation of transcription factors and recent data involving the small G protein family is also discussed. Finally, the participation of some members of Bcl-2 family and the inhibition of mitochondria-related apoptotic pathway is also considered. Altogether, these studies evidence that CGNs are a key model to understand the development and the survival of neuronal populations.
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Affiliation(s)
- Xavier Xifró
- Departament de Ciències Mèdiques, Facultat de Medicina, Universitat de Girona, C/ Emili Grahit, 77, 17071, Girona, Spain,
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Irwin M, Greig A, Tvrdik P, Lucero MT. PACAP modulation of calcium ion activity in developing granule cells of the neonatal mouse olfactory bulb. J Neurophysiol 2014; 113:1234-48. [PMID: 25475351 DOI: 10.1152/jn.00594.2014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Ca(2+) activity in the CNS is critical for the establishment of developing neuronal circuitry prior to and during early sensory input. In developing olfactory bulb (OB), the neuromodulators that enhance network activity are largely unknown. Here we provide evidence that pituitary adenylate cyclase-activating peptide (PACAP)-specific PAC1 receptors (PAC1Rs) expressed in postnatal day (P)2-P5 mouse OB are functional and enhance network activity as measured by increases in calcium in genetically identified granule cells (GCs). We used confocal Ca(2+) imaging of OB slices from Dlx2-tdTomato mice to visualize GABAergic GCs. To address whether the PACAP-induced Ca(2+) oscillations were direct or indirect effects of PAC1R activation, we used antagonists for the GABA receptors (GABARs) and/or glutamate receptors (GluRs) in the presence and absence of PACAP. Combined block of GABARs and GluRs yielded a 66% decrease in the numbers of PACAP-responsive cells, suggesting that 34% of OB neurons are directly activated by PACAP. Similarly, immunocytochemistry using anti-PAC1 antibody showed that 34% of OB neurons express PAC1R. Blocking either GluRs or GABARs alone indirectly showed that PACAP stimulates release of both glutamate and GABA, which activate GCs. The appearance of PACAP-induced Ca(2+) activity in immature GCs suggests a role for PACAP in GC maturation. To conclude, we find that PACAP has both direct and indirect effects on neonatal OB GABAergic cells and may enhance network activity by promoting glutamate and GABA release. Furthermore, the numbers of PACAP-responsive GCs significantly increased between P2 and P5, suggesting that PACAP-induced Ca(2+) activity contributes to neonatal OB development.
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Affiliation(s)
- Mavis Irwin
- Department of Physiology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Ann Greig
- Department of Physiology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Petr Tvrdik
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, Utah; Interdepartmental Neuroscience Program, University of Utah School of Medicine, Salt Lake City, Utah; and
| | - Mary T Lucero
- Department of Physiology, University of Utah School of Medicine, Salt Lake City, Utah; Interdepartmental Neuroscience Program, University of Utah School of Medicine, Salt Lake City, Utah; and Department of Neuroscience and Physiology, American University of the Caribbean, Cupecoy, Sint Maarten, Netherlands Antilles
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Tis21 knock-out enhances the frequency of medulloblastoma in Patched1 heterozygous mice by inhibiting the Cxcl3-dependent migration of cerebellar neurons. J Neurosci 2013; 32:15547-64. [PMID: 23115191 DOI: 10.1523/jneurosci.0412-12.2012] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A failure in the control of proliferation of cerebellar granule neuron precursor cells (GCPs), located in the external granular layer (EGL) of the cerebellum, gives rise to medulloblastoma. To investigate the process of neoplastic transformation of GCPs, we generated a new medulloblastoma model by crossing Patched1 heterozygous mice, which develop medulloblastomas with low frequency, with mice lacking the Tis21 gene. Overexpression of Tis21 is known to inhibit proliferation and trigger differentiation of GCPs; its expression decreases in human medulloblastomas. Double-knock-out mice show a striking increase in the frequency of medulloblastomas and hyperplastic EGL lesions, formed by preneoplastic GCPs. Tis21 deletion does not affect the proliferation of GCPs but inhibits their differentiation and, chiefly, their intrinsic ability to migrate outside the EGL. This defect of migration may represent an important step in medulloblastoma formation, as GCPs, remaining longer in the EGL proliferative niche, may become more prone to transformation. By genome-wide analysis, we identified the chemokine Cxcl3 as a target of Tis21. Cxcl3 is downregulated in Tis21-null GCPs of EGL and lesions; addition of Cxcl3 to cerebellar slices rescues the defective migration of Tis21-null GCPs and, remarkably, reduces the area of hyperplastic lesions. As Tis21 activates Cxcl3 transcription, our results suggest that Tis21 induces migration of GCPs through Cxcl3, which may represent a novel target for medulloblastoma therapy.
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Kanno T, Nishizaki T. Sphingosine induces apoptosis in hippocampal neurons and astrocytes by activating caspase-3/-9 via a mitochondrial pathway linked to SDK/14-3-3 protein/Bax/cytochrome c. J Cell Physiol 2011; 226:2329-37. [DOI: 10.1002/jcp.22571] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Andersen MØ, Kjems J. RNA Interference Enhanced Implants. ACTIVE IMPLANTS AND SCAFFOLDS FOR TISSUE REGENERATION 2011. [DOI: 10.1007/8415_2011_68] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Abstract
MAC (mitochondrial apoptosis-induced channel) forms in the mitochondrial outer membrane and unleashes cytochrome c to orchestrate the execution of the cell. MAC opening is the commitment step of intrinsic apoptosis. Hence closure of MAC may prevent apoptosis. Compounds that blocked the release of fluorescein from liposomes by recombinant Bax were tested for their ability to directly close MAC and suppress apoptosis in FL5.12 cells. Low doses of these compounds (IC50 values ranged from 19 to 966 nM) irreversibly closed MAC. These compounds also blocked cytochrome c release and halted the onset of apoptotic markers normally induced by IL-3 (interleukin-3) deprivation or staurosporine. Our results reveal the tight link among MAC activity, cytochrome c release and apoptotic death, and indicate this mitochondrial channel is a promising therapeutic target.
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Desfeux A, El Ghazi F, Jégou S, Legros H, Marret S, Laudenbach V, Gonzalez BJ. Dual effect of glutamate on GABAergic interneuron survival during cerebral cortex development in mice neonates. Cereb Cortex 2009; 20:1092-108. [PMID: 19759125 DOI: 10.1093/cercor/bhp181] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In term and preterm neonates, massive glutamate release can lead to excitotoxic white-matter and cortical lesions. Because of its high permeability toward calcium, the N-methyl-D-aspartic acid (NMDA) receptor is thought to play an important role in excitotoxic lesions and NMDA antagonists therefore hold promise for neuroprotection. We found that, in neonatal mouse cortex, a given NMDA concentration exerted either excitotoxic or antiapoptotic effects depending on the cortical layers. In layer VI, NMDA led to excitotoxicity, sustained calcium mobilization, and necrosis of Gad67GFP neurons. In the immature layers II-IV, NMDA decreased apoptosis and induced transient calcium mobilization. The NMDA antagonist MK801 acted as a potent caspase-3 activator in immature layers II-IV and affected gamma aminobutyric acid (GABA)ergic interneurons. The apoptotic effect of MK801-induced BAX expression, mitochondrial potential collapse and caspase-9 activation. In vivo Bax small interfering ribonucleic acid and a caspase-9 inhibitor abrogated MK801-induced apoptosis and pyknotic nucleus formation. Ketamine, an anesthetic with NMDA antagonist properties, mimicked the apoptotic effects of MK801. These data indicate a dual effect of glutamate on survival of immature and mature GABAergic neurons and suggest that ketamine may induce apoptosis of immature GABAergic neurons.
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Affiliation(s)
- Arnaud Desfeux
- EA NeoVasc 4309, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Rouen Institute for Biomedical Research, European Institute for Peptide Research (IFR 23) University of Rouen, 76183 Rouen, France
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Aubert N, Vaudry D, Falluel-Morel A, Desfeux A, Fisch C, Ancian P, de Jouffrey S, Le Bigot JF, Couvineau A, Laburthe M, Fournier A, Laudenbach V, Vaudry H, Gonzalez BJ. PACAP prevents toxicity induced by cisplatin in rat and primate neurons but not in proliferating ovary cells: involvement of the mitochondrial apoptotic pathway. Neurobiol Dis 2008; 32:66-80. [PMID: 18652895 DOI: 10.1016/j.nbd.2008.06.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Revised: 05/27/2008] [Accepted: 06/15/2008] [Indexed: 02/08/2023] Open
Abstract
Cisplatin is a chemotherapeutic agent whose use is limited by side effects including neuropathies. In proliferating cells, toxic action of cisplatin is based on DNA interactions, while, in quiescent cells, it can induce apoptosis by interacting with proteins. In the present study, we compared cytotoxic mechanisms activated by cisplatin in primate and rodent neurons and in ovary cells in order to determine whether the anti-apoptotic peptide PACAP could selectively reduce neurotoxicity. In quiescent neurons, JNK and sphingomyelinase inhibitors blocked cisplatin-induced cell death. Toxicity was associated with DNA laddering, caspase-3 and -9 activations and Bax induction. These effects were prevented by PACAP. In proliferating cells, cisplatin activated caspase-8 but had no effect on caspase-9. PACAP exerted no protective effect. These data indicate that cisplatin activates distinct apoptotic pathways in quiescent neurons and proliferating cells and that PACAP may reduce neurotoxicity of cisplatin without affecting its chemotherapeutic efficacy.
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Affiliation(s)
- Nicolas Aubert
- INSERM U413, Laboratory of Cellular and Molecular Neuroendocrinology, European Institute for Peptide Research (IFRMP 23), University of Rouen, Mont-Saint-Aignan, France
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Interactions of PACAP and ceramides in the control of granule cell apoptosis during cerebellar development. J Mol Neurosci 2008; 36:8-15. [PMID: 18574733 DOI: 10.1007/s12031-008-9111-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2008] [Accepted: 02/28/2008] [Indexed: 12/27/2022]
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) is a neuropeptide that belongs to the secretin/glucagon/vasoactive intestinal polypeptide superfamily. The PACAPergic system is actively expressed in the developing cerebellum of mammals. In particular, PACAP receptors are expressed by granule cell precursors suggesting a role of the peptide in neurogenesis of this cell type. Consistent with this hypothesis, several studies reported antiapoptotic effects of PACAP in the developing cerebellum. On the other hand, the sphingomyelin metabolites ceramides are recognized as important signaling molecules that play pivotal roles during neuronal development. Ceramides, which production can be induced by death factors such as FasL or TNFalpha, are involved in the control of cell survival during brain development through activation of caspase-dependent mechanisms. The present review focuses on the interactions between PACAP and ceramides in the control of granule cell survival and on the transduction mechanisms associated with the anti- and proapoptotic effects of PACAP and ceramides, respectively.
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