1
|
Mejia S, Rodríguez J, Ruiz-Patiño A, Archila P, Chamorro D, Arrieta O, Viola L, Ordoñez-Reyes C, Garcia-Robledo J, Sotelo C, Raez L, Samtani S, Recondo G, Martín C, Corrales L, Zatarain-Barrón L, Más L, Ricaurte L, Santoyo N, Cuello M, Jaller E, Vargas C, Carranza H, Otero J, Bermudez M, Gamez T, Cordeiro de Lima V, Malapelle U, Rolfo C, Rosell R, Cardona A. EP16.03-003 Systematic Population-based Identification of NTRK Fusion Genes Among Hispanic Patients with Non-Small Cell Lung Cancer (NSCLC). J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.1063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
2
|
Chamorro D, Ruiz-Patiño A, Recondo G, Martín C, Raez L, Samtani S, Minata J, Blaquier J, Enrico D, Burotto M, Ordoñez-Reyes C, Garcia-Robledo J, Corrales L, Zatarain-Barrón L, Más L, Sotelo C, Ricaurte L, Santoyo N, Cuello M, Mejia S, Jaller E, Vargas C, Carranza H, Otero J, Rodríguez J, Archila P, Bermudez M, Gamez T, Cordeiro de Lima V, Freitas H, Russo A, Polo C, Malapelle U, de Miguel-Perez D, Rolfo C, Viola L, Rossell R, Arrieta O, Cardona A. EP16.03-002 Mechanisms of Resistance to First-line Osimertinib in Hispanic Patients with EGFR mutant Non-Small Cell Lung Cancer (FRESTON-CLICaP∫). J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.1062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
3
|
Rojas L, Mayorga D, Ruiz-Patiño A, Rodríguez J, Cardona AF, Archila P, Avila J, Bravo M, Ricaurte L, Sotelo C, Arrieta O, Zatarain-Barrón ZL, Carranza H, Otero J, Vargas C, Barrón F, Corrales L, Martín C, Recondo G, Pino LE, Bermudez MA, Gamez T, Ordoñez-Reyes C, García-Robledo JE, de Lima VC, Freitas H, Santoyo N, Malapelle U, Russo A, Rolfo C, Rosell R. Human papillomavirus infection and lung adenocarcinoma: special benefit is observed in patients treated with immune checkpoint inhibitors. ESMO Open 2022; 7:100500. [PMID: 35753086 PMCID: PMC9434139 DOI: 10.1016/j.esmoop.2022.100500] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 03/27/2022] [Accepted: 04/19/2022] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Human papilloma virus (HPV) has been associated with the development and modulation of response in a series of neoplasms. In the case of lung adenocarcinoma, its role in etiology and pathogenesis is still controversial. Considering that this infection brings foreign epitopes, it could be of prognostic significance in patients with lung adenocarcinoma treated with immunotherapy. METHODS In a retrospective cohort study we evaluated the presence of HPV genomic material in lung adenocarcinoma primary lesions with the INNO-LiPA platform. Viral replication was also evaluated by detecting the presence of oncoprotein E6/E7 messenger RNA (mRNA) by quantitative RT-PCR. To confirm possible hypotheses regarding viral oncogenesis, vascular endothelial growth factor (VEGF) and hypoxia-inducible factor 1 (HIF1) were evaluated with stromal fibrosis and immunoscore. RESULTS A total of 133 patients were included in the analysis, of whom 34 tested positive for HPV, reaching an estimated prevalence of 25.6% [95% confidence interval (CI) 18.2% to 32.9%]. E6/7 mRNA was identified in 28 out of the 34 previously positive cases (82.3%). In immune checkpoint inhibitor (ICI)-treated patients, the median overall survival reached 22.3 months [95% CI 19.4 months- not reached (NR)] for HPV-negative and was not reached in HPV-positive (HPV+) ones (95% CI 27.7-NR; P = 0.008). With regard to progression-free survival, HPV- patients reached a median of 9.2 months (95% CI 7.9-11.2 months) compared to 14.3 months (95% CI 13.8-16.4 months) when HPV was positive (P = 0.001). The overall response rate for HPV+ patients yielded 82.4% compared to 47.1% in negative ones. No differences regarding programmed death-ligand 1, VEGF, HIF1, stromal fibrosis, or immunoscore were identified. CONCLUSIONS In patients with HPV+ lung adenocarcinoma, a significant benefit in overall response and survival outcomes is observed.
Collapse
|
4
|
Ruiz-Patiño A, Rodriguez J, Avila Coy J, Archila P, Cardona Zorrilla A, Sotelo C, Carranza H, Vargas C, Otero J, Bermudez M, Gamez T, Arrieta O, Rojas Puentes L, Corrales L, Martin C, Garcia-Robledo J, Santoyo Sarmiento N, Rolfo C, Rosell R. P59.14 Concordance and Performance of ddPCR Compared to NGS for The Detection of KRAS G12C Mutation. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
5
|
Ruiz-Patiño A, Rodriguez J, Avila Coy J, Archila P, Cardona Zorrilla A, Sotelo C, Carranza H, Vargas C, Otero J, Bermudez M, Gamez T, Arrieta O, Zatarain Barron L, Puentes LR, Corrales L, Martin C, Garcia-Robledo J, Sarmiento NS, Rolfo C, Rosell R. P70.01 KRAS G12C Mutations Among NSCLC Patients Present With a High Intrerregional Variation, Indicating a Population Substructure. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
6
|
Ruiz-Patiño A, Rodriguez J, Avila Coy J, Archila P, Cardona Zorrilla A, Sotelo C, Carranza H, Vargas C, Otero J, Bermudez M, Gamez T, Arrieta O, Zatarain Barron L, Puentes LR, Corrales L, Martin C, Garcia-Robledo J, Sarmiento NS, Rolfo C, Rosell R. P70.08 Allelic Frequencies of Population Markers Correlate with KRAS G12C Prevalence: Considerations for Ancestries and Molecular Epidemiology. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
7
|
Barrón F, Cardona A, Ruiz-Patiño A, Barron LZ, Corrales-Rodriguez L, Martín C, Sotelo C, Rodríguez J, Ávila J, Mayorga D, Archila P, Mas L, Freitas H, De Lima VC, Otero J, Carranza H, Vargas C, Rosell R. PD1.05 Relevance of Antibiotic Use on Clinical Activity of Immune Checkpoint Inhibitors in Hispanic Patients with Advanced Non-small-cell Lung Cancer (CLICAP-ABs). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
8
|
Cardona A, Arrieta O, Ruiz-Patiño A, Barron LZ, Corrales-Rodriguez L, Martín C, Barrón F, Sotelo C, Rodríguez J, Ricaurte L, Ávila J, Mayorga D, Archila P, Otero J, Freitas H, De Lima VC, Mas L, Carranza H, Vargas C, Rosell R. PD2.06 EGFR Inhibitors + Bevacizumab Demonstrated Superior Efficacy Compared with EGFR Inhibitors Alone as First-line Treatment in Advanced NSCLC Patients with EGFR Mutations and BIM Deletion Polymorphisms. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
9
|
Cardona A, Arrieta O, Ruiz-Patiño A, Barron LZ, Corrales-Rodriguez L, Martín C, Barrón F, Sotelo C, Rodríguez J, Ricaurte L, Freitas H, De Lima VC, Mas L, Ávila J, Mayorga D, Archila P, Otero J, Carranza H, Vargas C, Rosell R. PD2.03 Exploration of Factors Relating to Immune Response in Patients Treated with Immune Checkpoint Inhibitors for Non-small Cell Lung Cancer (NSCLC). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
10
|
Cardona A, Arrieta O, Ruiz-Patiño A, Barron LZ, Corrales-Rodriguez L, Martín C, Barrón F, Sotelo C, Rodríguez J, Ricaurte L, Ávila J, Mayorga D, Archila P, Freitas H, De Lima VC, Mas L, Otero J, Carranza H, Vargas C, Rosell R. P2.22 Immunotherapy-related Thrombosis: Considerations and Associated Factors in Non-small Cell Lung Cancer (NSCLC) Patients. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
11
|
Mas L, Patane A, Arrieta O, Soria T, Cardona A, Martín C, Ruiz-Patiño A, Ruiz R, Rioja P, Lozano S, Barron LZ, Barrón F, Corassa M, Freitas H, De Lima VC, Corrales-Rodriguez L, Sotelo C, Rodríguez J, Ricaurte L, Ávila J, Mayorga D, Bravo M, Archila P, Otero J, Carranza H, Vargas C, Rosell R, Remon J. P1.12 Real World Characterization and Treatment Patterns of Patients with Thymic Carcinoma: Lessons from a Latin American Collaborative Study (CLICaP-LATimus). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
12
|
Cardona A, Ruiz-Patiño A, Arrieta O, Martín C, Raez L, Barron LZ, Barrón F, Ricaurte L, Bravo-Garzón M, Mas L, Corrales-Rodriguez L, Rojas L, Lupinacci L, Perazzo F, Bas C, Carranza O, Pupareli C, Rizzo M, Mendoza RR, Rolfo C, Archila P, Rodríguez J, Sotelo C, Vargas C, Carranza H, Otero J, Pino L, Ortíz C, Laguado P, Rosell R. P2.25 Immunotherapy at Any Line of Treatment Improves Survival in Hispanic Patients with Advanced Metastatic Non-Small Cell Lung Cancer (NSCLC) Compared with Chemotherapy (Quijote-CLICaP). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
13
|
Cardona A, Arrieta O, Ruiz-Patiño A, Barrón ZZ, Rojas L, Corrales L, Martin C, Barrón F, Sotelo C, Rodriguez J, Ricaurte L, Ávila J, Mayorga D, Archila P, Otero J, Freitas H, De Lima VC, Mas L, Carranza H, Vargas C, Rosell R. P1.14-61 EGFR Inhibitors Plus Bevacizumab Are Superior Compared to EGFR Inhibitor Monotherapy in Advanced EGFR+ NSCLC Patients with BIM Deletions. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
14
|
Mas L, Patané A, Arrieta O, Soria T, Cardona A, Martin C, Ruiz-Patiño A, Rojas L, Ruiz R, Rioja P, Lozano S, Barrón ZZ, Corassa M, Freitas H, De Lima VC, Corrales L, Sotelo C, Rodriguez J, Ricaurte L, Ávila J, Mayorga D, Bravo M, Archila P, Otero J, Carranza H, Vargas C, Rosell R, Remon J. EP1.15-28 Survival of Thymoma Is Extensive in Latin-American Patients: Results from Over 10 Years of Experience (CLICaP-LATimus). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.2363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
15
|
Barrón F, Arrieta O, Cardona A, Ruiz-Patiño A, Barrón ZZ, Rojas L, Corrales L, Martin C, Sotelo C, Rodriguez J, Ávila J, Bravo M, Mayorga D, Archila P, Mas L, Freitas H, De Lima VC, Otero J, Carranza H, Vargas C, Rosell R. EP1.04-45 Relevance of Antibiotic Use on Clinical Activity of Immune Checkpoint Inhibitors in Hispanic Patients with Advanced NSCLC (CLICAP-ABs). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.2131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
16
|
Cardona A, Ruiz-Patiño A, Arrieta O, Martin C, Raez L, Barrón ZZ, Barrón F, Ricaurte L, Bravo-Garzón M, Mas L, Corrales L, Rojas L, Lupinacci L, Perazzo F, Bas C, Carranza O, Puparelli C, Rizzo M, Ruiz R, Rolfo C, Archila P, Rodriguez J, Sotelo C, Vargas C, Carranza H, Otero J, Pino L, Ortiz C, Laguado P, Rosell R. EP1.04-46 Immunotherapy at Any Line Improves Survival in Hispanic Patients with Advanced Metastatic NSCLC Compared to Chemotherapy (Quijote-CLICaP). J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.2163] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
17
|
Sotelo C. Transplantation de neurones embryonnaires dans le cervelet de souris. ACTA ACUST UNITED AC 2013. [DOI: 10.4267/10608/3870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
18
|
Lebrun C, Avci HX, Wehrlé R, Doulazmi M, Jaudon F, Morel MP, Rivals I, Ema M, Schmidt S, Sotelo C, Vodjdani G, Dusart I. Klf9 is necessary and sufficient for Purkinje cell survival in organotypic culture. Mol Cell Neurosci 2012. [PMID: 23201237 DOI: 10.1016/j.mcn.2012.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
During their phase of developmental programmed cell death (PCD), neurons depend on target-released trophic factors for survival. After this period, however, they critically change as their survival becomes target-independent. The molecular mechanisms underlying this major transition remain poorly understood. Here, we investigated, which transcription factors (TFs) might be responsible for the closure of PCD. We used Purkinje cells as a model since their PCD is restricted to the first postnatal week in the mouse cerebellum. Transcriptome analysis of Purkinje cells during or after PCD allowed the identification of Krüppel like factor 9 (Klf9) as a candidate for PCD closure, given its high increase of expression at the end of the 1st postnatal week. Klf9 function was tested in organotypic cultures, through lentiviral vector-mediated manipulation of Klf9 expression. In absence of trophic factors, the Purkinje cell survival rate is of 40%. Overexpression of Klf9 during PCD dramatically increases the Purkinje cell survival rate from 40% to 88%, whereas its down-regulation decreases it to 14%. Accordingly, in organotypic cultures of Klf9 knockout animals, Purkinje cell survival rate is reduced by half as compared to wild-type mice. Furthermore, the absence of Klf9 could be rescued by Purkinje cell trophic factors, Insulin growth factor-1 and Neurotrophin3. Altogether, our results ascribe a clear role of Klf9 in Purkinje cell survival. Thus, we propose that Klf9 might be a key molecule involved in turning off the phase of Purkinje PCD.
Collapse
|
19
|
Bloch-Gallego E, Sotelo C. Chimio-attraction ou chimio-répulsion axonale : rôle des nétrines et des sémaphorines. Med Sci (Paris) 2012. [DOI: 10.4267/10608/882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
20
|
Sotelo C. La construction du cerveau : de la physiologie à la physiologie, en passant par le clonage des gènes. Med Sci (Paris) 2012. [DOI: 10.4267/10608/1614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
21
|
Sotelo C, Dusart I. Intrinsic versus extrinsic determinants during the development of Purkinje cell dendrites. Neuroscience 2009; 162:589-600. [PMID: 19166910 DOI: 10.1016/j.neuroscience.2008.12.035] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Revised: 12/19/2008] [Accepted: 12/20/2008] [Indexed: 01/07/2023]
Abstract
The peculiar shape and disposition of Purkinje cell (PC) dendrites, planar and highly branched, offers an optimal model to analyze cellular and molecular regulators for the acquisition of neuronal dendritic trees. During the first 2 weeks after the end of the proliferation period, PCs undergo a 2-phase remodeling process of their dendrites. The first phase consists in the complete retraction of the primitive but extensive dendritic tree, together with the formation of multiple filopodia-like processes arising from the cell body. In the second phase, there is a progressive disappearance of the somatic processes along with rapid growth and branching of the mature dendrite. Mature Purkinje cell dendrites bear two types of spiny protrusions, named spine and thorn. The spines are numerous, elongated, located at the distal dendritic compartment and form synapses with parallel fibers, whereas the thorns are shorter, rounded, emerge from the proximal compartment and synapse with climbing fibers. Different culture models and mutant mice analyses suggest the identification of intrinsic versus extrinsic determinants of the Purkinje cell dendritic development. The early phase of dendritic remodeling might be cell autonomous and regulated by specific transcription factors such as retinoid-related orphan receptor alpha (RORalpha). Afferent fibers, trophic factors and hormones regulate the orientation and growth of the mature dendritic tree contributing, with still unknown intrinsic factors, to sculpt its general architecture. The formation of spines appears as an intrinsic phenomenon independent of their presynaptic partner, the parallel fibers, and confined to the distal compartment by inhibitory influences of the climbing fibers along the proximal compartment.
Collapse
|
22
|
Korhonen L, Hansson I, Maugras C, Wehrle R, Kairisalo M, Borgkvist A, Jokitalo E, Sotelo C, Fisone G, Dusart I, Lindholm D. Expression of X-chromosome linked inhibitor of apoptosis protein in mature Purkinje cells and in retinal bipolar cells in transgenic mice induces neurodegeneration. Neuroscience 2008; 156:515-26. [PMID: 18765270 DOI: 10.1016/j.neuroscience.2008.08.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2008] [Revised: 08/04/2008] [Accepted: 08/05/2008] [Indexed: 11/28/2022]
Abstract
Transgenic mice with overexpression of the caspase-inhibitor, X-chromosome-linked inhibitor of apoptosis protein (XIAP) in Purkinje cell (PC) and in retinal bipolar cells (RBCs) were produced to study the regulation of cell death. Unexpectedly, an increased neurodegeneration was observed in the PCs in these L7-XIAP mice after the third postnatal week with the mice exhibiting severe ataxia. The loss of PCs was independent of Bax as shown by crossing the L7-XIAP mice with Bax gene-deleted mice. Electron microscopy revealed intact organelles in PCs but with the stacking of ER cisterns indicative of cell stress. Immunostaining for cell death proteins showed an increased phosphorylation of c-Jun in the PCs, suggesting an involvement in cell degeneration. Apart from PCs, the number of RBCs was decreased in adult retina in line with the expression pattern for the L7 promoter. The data show that overexpression of the anti-apoptotic protein XIAP in vulnerable neurons leads to enhanced cell death. The mechanisms underlying this neurodegeneration can be related to the effects of XIAP on cell stress and altered cell signaling.
Collapse
|
23
|
Dusart I, Ghoumari A, Wehrle R, Morel MP, Bouslama-Oueghlani L, Camand E, Sotelo C. Cell death and axon regeneration of Purkinje cells after axotomy: challenges of classical hypotheses of axon regeneration. ACTA ACUST UNITED AC 2005; 49:300-16. [PMID: 16111558 DOI: 10.1016/j.brainresrev.2004.11.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2004] [Revised: 11/16/2004] [Accepted: 11/24/2004] [Indexed: 12/11/2022]
Abstract
Although adult mammalian neurons are able to regenerate their axons in the peripheral nervous system under certain conditions, they are not able to do it in the central nervous system. The environment surrounding the severed axons appears to be a key factor for axon regeneration. Many studies aiming to enhance axon regeneration in the CNS of adult mammals have successfully manipulated this environment by adding growth permissive molecules and/or neutralizing growth inhibitory molecules. In both cases, the number of axons able to regenerate was low and the different neuronal populations were not equal in their regenerative response, suggesting that manipulation of the environment is not always sufficient. This is particularly well illustrated in the cerebellar system, in which axotomized inferior olivary neurons regenerate when confronted with a permissive environment, whereas mature Purkinje cells do not. The intrinsic ability of a neuron to regenerate its axon is generally correlated with the intensity of its reaction to axotomy (expression of molecules, probability to die). Furthermore, molecules such as GAP-43 (growth-associated molecule) and c-Jun are involved in both axon regeneration and cell death suggesting that these two processes are linked. Surprisingly, Purkinje cells lose their capacity to regenerate their axon (even in the absence of myelin) during development before losing their capacity to react to an axotomy by cell death. These results emphasize the different reactions to axotomy between neuron types and underline that in Purkinje cells, the two cell decisions (axon regeneration and cell death) are differently regulated and therefore not part of the same signaling pathway.
Collapse
|
24
|
Ghoumari AM, Wehrlé R, Sotelo C, Dusart I. Bcl-2 protection of axotomized Purkinje cells in organotypic culture is age dependent and not associated with an enhancement of axonal regeneration. PROGRESS IN BRAIN RESEARCH 2005; 148:37-44. [PMID: 15661179 DOI: 10.1016/s0079-6123(04)48004-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
|
25
|
Soares S, Sotelo C. Adult neural stem cells from the mouse subventricular zone are limited in migratory ability compared to progenitor cells of similar origin. Neuroscience 2004; 128:807-17. [PMID: 15464288 DOI: 10.1016/j.neuroscience.2004.07.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/14/2004] [Indexed: 11/18/2022]
Abstract
The subventricular zone (SVZ) in the forebrain is the largest source of neural stem cells and progenitor cells in the adult CNS. To assess the ability of adult neural stem cells to survive, differentiate and migrate, we have compared the behavior of dissociated, neurosphere-derived stem cells with that of progenitor cells in transplantation experiments. This ability was first tested in vivo, offering the stem cells the possibility to migrate along the rostral migratory stream (RMS), their specific pathway. In addition, the differential behaviors of the two classes of cells were also compared in vitro by grafting them into organotypic slice cultures containing either tangential (embryonic cerebral cortex) or radial (early postnatal cerebellar cortex) migratory routes. Most of the grafted adult neurosphere-derived stem cells survived and integrated in vivo, and a proportion of them differentiate into neurons, oligodendrocytes or astrocytes. However, they were unable to migrate along the RMS and remained in the vicinity of the injection site. In contrast, SVZ progenitor cells were able to migrate toward the olfactory bulb and, once there, to acquire the phenotype of granule cells, as previously reported. In vitro, neural stem cells exhibited a better migratory ability, although they only migrated for short distances, particularly, in forebrain slices. Nevertheless, the average distance covered by progenitor cells was a two-fold longer than that covered by neural stem cells, corroborating that this class of more specified cells has higher migratory ability. These results suggest that the in vitro conditions of expanding SVZ-derived stem cells, required to maintain them in an immature stage might modify their intrinsic properties, preventing their differentiation into neuroblasts and their subsequent migration.
Collapse
|