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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Intracellular signals underlying the inductive effects of agrin during neuromuscular junction formation : study on the roles of ras and Shc

Lemaire, Mathieu. January 2000 (has links)
No description available.
22

Study of BRE expression and regulation. / Study of BRE expression & regulation

January 2006 (has links)
Tam Ka-ying. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (leaves 164-179). / Abstracts in English and Chinese. / Chapter Chapter one: --- Introduction --- p.4 / Chapter 1.1 --- Introduction of BRE --- p.4 / Chapter 1.1.1 --- Discovery of BRE --- p.4 / Chapter 1.1.2 --- cDNA sequence and amino acids sequence of BRE --- p.4 / Chapter 1.1.3 --- BRE expression level in Human and rat organs --- p.5 / Chapter 1.1.4 --- Expression of Human and mouse BRE in multiple isoforms --- p.6 / Chapter 1.1.4.1 --- BRE isoforms in Human --- p.6 / Chapter 1.1.4.2 --- BRE isoforms in mouse --- p.6 / Chapter 1.1.5 --- mRNA level of BRE upon stress --- p.7 / Chapter 1.1.6 --- BRE and steroidogenesis --- p.8 / Chapter 1.1.7 --- BRE and p55 tumor necrosis factor α (TNF) receptor --- p.9 / Chapter 1.1.8 --- BRE and NFkB activity --- p.9 / Chapter 1.1.9 --- Anti-apoptotic effect of BRE --- p.10 / Chapter 1.1.10 --- BRE enhances the growth of tumor cells --- p.12 / Chapter 1.1.11 --- BRE and its ubiquitination activity --- p.12 / Chapter 1.1.12 --- Regulation of Prohibitin and p53 expression and proliferation by BRE --- p.13 / Chapter 1.2 --- Regulation of transcription --- p.15 / Chapter 1.2.1 --- Cis-acting elements --- p.17 / Chapter 1.2.1.1 --- The TATA box --- p.18 / Chapter 1.2.1.2 --- The GC box and CAAT box --- p.18 / Chapter 1.2.1.3 --- The initiator (Inr) --- p.19 / Chapter 1.2.1.4 --- CpG islands --- p.20 / Chapter 1.2.2 --- Trans- acting protein factors --- p.21 / Chapter 1.2.2.1 --- Zinc finger domain --- p.21 / Chapter 1.2.2.2 --- Basic helix-turn-helix domain (bHLH) --- p.22 / Chapter 1.3 --- Hypothesis and Objectives --- p.23 / Chapter Chapter two: --- Materials and Methods --- p.25 / Chapter 2.1 --- Materials --- p.25 / Chapter 2.1.1 --- Primers used in polymerase chain reaction (PCR) and sequencing --- p.25 / Chapter 2.1.2 --- DNA clones used in the studies --- p.26 / Chapter 2.1.3 --- Materials for DNA manipulation --- p.27 / Chapter 2.1.4 --- Materials for protein manipulation --- p.28 / Chapter 2.1.5 --- Antibodies --- p.28 / Chapter 2.1.6 --- Chemical used in treatments --- p.29 / Chapter 2.1.7 --- Kits --- p.29 / Chapter 2.1.8 --- Culture media and reagents --- p.30 / Chapter 2.1.9 --- Instrumentation --- p.30 / Chapter 2.1.10 --- Bacterial strain used for transfection and cloning --- p.31 / Chapter 2.2 --- Methodologies --- p.36 / Chapter 2.2.1 --- Cell culture --- p.36 / Chapter 2.2.1.1 --- Monolayer cells --- p.36 / Chapter 2.2.1.2 --- Suspension cell --- p.36 / Chapter 2.2.2 --- Identification of the transcriptional start site (TSS) of BRE by RNA ligase- mediated rapid amplification of 5,and 3,cDNA ends (RLM-RACE) --- p.37 / Chapter 2.2.3 --- Preparation of the 5' untranslated region (UTR) fragments of BRE --- p.39 / Chapter 2.2.3.1 --- Polymerase chain reaction (PCR) with Taq polymerase --- p.39 / Chapter 2.2.3.2 --- Polymerase chain reaction (PCR) with PhusiońёØ high-fidelity DNA.… --- p.40 / Chapter 2.2.4 --- Construction of the reporter constructs --- p.42 / Chapter 2.2.5 --- Cell transfection --- p.42 / Chapter 2.2.6 --- Dual-luciferase reporter assay --- p.43 / Chapter 2.2.7 --- Western blotting --- p.44 / Chapter 2.2.8 --- Cell cycle analysis by flow cytometry --- p.45 / Chapter 2.2.9 --- BRE antibody production --- p.43 / Chapter Chapter Three: --- Identification of transcriptional start sites and promoter region for BRE --- p.52 / Chapter 3.1 --- Identification of the transcriptional start sites for BRE --- p.52 / Chapter 3.2 --- Computational analysis of the 5' region of BRE --- p.57 / Chapter 3.2.1 --- Putative transcriptional factor binding sites --- p.57 / Chapter 3.2.2 --- CpG island --- p.58 / Chapter 3.3 --- Identification of BRE promoter --- p.64 / Chapter Chapter Four: --- Characterization of transcriptional regulation of BRE --- p.70 / Chapter 4.1 --- Regulation of BRE promoter by genotoxic stimuli and retinoic acid --- p.71 / Chapter 4.1.1 --- Etoposide --- p.71 / Chapter 4.1.2 --- 4-nitroquinoline-l -oxide (4NQO) --- p.79 / Chapter 4.1.3 --- Retinoic acid (RA) --- p.87 / Chapter 4.2 --- Regulation of BRE promoter by p53 protein and gamma irradiation --- p.90 / Chapter 4.2.1 --- Co-transfection with p53 plasmid --- p.90 / Chapter 4.2.2 --- Gamma irradiation (y irradiation) --- p.96 / Chapter 4.2.2.1 --- γ irradiation treatment of HeLa cells --- p.96 / Chapter 4.2.2.2 --- γ irradiation treatment of Balb/c 3T3 cells --- p.99 / Chapter 4.3 --- Regulation of BRE promoter by BRE --- p.103 / Chapter 4.3.1 --- Co-transfection with V5-tagged BRE (GS-BRE) --- p.103 / Chapter 4.3 2 --- Co-transfection with untagged BRE (pcDNA3-BRE) --- p.107 / Chapter 4.4 --- Regulation of BRE promoter by culture condition --- p.110 / Chapter 4.4.1 --- Cell density --- p.110 / Chapter 4.4.2 --- Serum deprivation --- p.114 / Chapter 4.5 --- Regulation of BRE promoter by kinase inhibitors --- p.120 / Chapter Chapter Five: --- BRE and cell cycle analysis --- p.127 / Chapter 5.1 --- Cell synchronization in G1 phase by aphidicolin (APC) --- p.127 / Chapter 5.1.1 --- Flow analysis --- p.128 / Chapter 5.1.2 --- Luciferase reporter assay --- p.128 / Chapter 5.1.3 --- Western blot analysis --- p.129 / Chapter 5.2 --- Cell synchronization in G2/M phase by colchicine (COL) --- p.137 / Chapter 5.2.1 --- Flow analysis --- p.137 / Chapter 5.2.2 --- Luciferase reporter assay --- p.137 / Chapter 5.2.3 --- Western blot analysis --- p.138 / Chapter 5.3 --- Cell cycle analysis of the treatments investigated by luciferase assays --- p.144 / Chapter Chapter Six: --- Discussion --- p.149 / Chapter 6.1 --- Study of BRE expression --- p.149 / Chapter 6.2 --- Study of BRE regulation --- p.154 / Chapter 6.3 --- Conclusion --- p.163 / Reference --- p.164 / Appendix (Raw data and statistical information of luciferase assays)
23

Investigation of the role of engulfment adaptor protein 1 (GULP1) in amyloid precursor protein (APP) processing. / CUHK electronic theses & dissertations collection

January 2013 (has links)
Chiu, Wai Yin Vivien. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 151-162). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts also in Chinese.
24

Functional characterization of CRMP1 in the epithelial-mesenchymal transition regulation in prostate cancer. / CRMP1在前列腺癌上皮-间质转化中的功能研究 / CUHK electronic theses & dissertations collection / CRMP1 zai qian lie xian ai shang pi- jian zhi zhuan hua zhong de gong neng yan jiu

January 2013 (has links)
Cai, Ganhui. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 160-192). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.
25

Role of Brain-and reproductive-organs-specific (BRE) gene in liver.

January 2007 (has links)
Wong, Chi Bun. / Thesis submitted in: Nov 2006. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 116-127). / Abstracts in English and Chinese. / Acknowledgements --- p.i / Abstract --- p.ii / 摘要 --- p.v / Abbreviations --- p.vii / List of Table and Figures --- p.ix / Table of Contents --- p.x / Chapter Chapter 1 --- p.1 / Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Identification of the proteins regulated by BRE when BRE was over-expressed or silencedin C2C12 and D122 --- p.1 / Chapter 1.1.1 --- What is BRE? --- p.1 / Chapter 1.1.2 --- BRE gene is Highly Conserved --- p.2 / Chapter 1.1.3 --- BRE binds to the Intracellular Domain of TNFR1 and Fas --- p.3 / Chapter 1.1.4 --- BRE Suppresses Apoptosis --- p.4 / Chapter 1.1.5 --- "BRE forms a Holoenzyme Complex with BRCA1, BARD1 and BRCC36" --- p.4 / Chapter 1.16 --- Roles of the Differentially Expressed Proteins Identified in the siRNA knockdown Experiments --- p.5 / Chapter 1.1.6.1 --- Akt3 --- p.5 / Chapter 1.1.6.2 --- Mdm2/4 --- p.6 / Chapter 1.1.6.3 --- Prohibitin --- p.7 / Chapter 1.1.6.4 --- Carbonic Anhydrase III --- p.8 / Chapter 1.1.6.5 --- 26S Proteasome --- p.8 / Chapter 1.2 --- The Role of BRE in Liver: a morphological approach --- p.9 / Chapter 1.2.1 --- The General Structure of the Liver. --- p.9 / Chapter 1.2.2 --- The Essential Functions of the Liver --- p.11 / Chapter 1.2.3 --- Inflammation of the Liver --- p.11 / Chapter 1.2.3.1 --- Hepatitis --- p.11 / Chapter 1.2.3.2 --- Acute Hepatitis --- p.12 / Chapter 1.2.3.3 --- Chronic Hepatitis --- p.12 / Chapter 1.2.4 --- Necrosis and Apoptosis --- p.13 / Chapter 1.2.5 --- The Apoptotic Pathway --- p.14 / Chapter 1.2.6 --- Hepatic Necrosis is Divided into Different Zones --- p.16 / Chapter 1.2.6.1 --- Hepatitis Necrosis is Categorized into 3 Zones --- p.16 / Chapter 1.2.7 --- Carbon Tetrachloride (CCL4) --- p.16 / Chapter 1.2.8 --- TNFa is a Pleiotropic Cytokine --- p.17 / Chapter 1.3 --- The Objectives of This Project --- p.20 / Chapter Chapter 2 --- p.21 / Chapter 2. --- Materials and Methods --- p.21 / Chapter 2.1 --- Animals --- p.21 / Chapter 2.2 --- Adminstration of Carbon Tetrachloride and Corn Oil --- p.21 / Chapter 2.3 --- Cell Cultures --- p.22 / Chapter 2.4 --- Cell Culturing --- p.22 / Chapter 2.5 --- Gene Silencing with Small Interfering RNA (siRNA) --- p.23 / Chapter 2.5.1 --- Transfection with BRE siRNA --- p.24 / Chapter 2.6 --- Cell Proliferation Assays --- p.24 / Chapter 2.7 --- In-Situ Hybridization of BRE Sense and Antisense Probes --- p.25 / Chapter 2.8 --- Immunohistological Staining --- p.26 / Chapter 2.9 --- Semi-Quantitative RT-PCR --- p.28 / Chapter 2.10 --- Comparative Proteomics --- p.29 / Chapter 2.10.1 --- Sample Preparation for Two Dimensional Gel Electrophoresis --- p.29 / Chapter 2.10.2 --- Two Dimensional Polyacrylamide Gel Electrophoresis --- p.30 / Chapter 2.10.3 --- In-Gel Digestion and MALDI-TOF Analysis --- p.31 / Chapter 2.11 --- Western Blotting --- p.32 / Chapter 2.12 --- Flow Cytometry --- p.34 / Chapter 2.13 --- Haematoxylin and Eosin Staining (H&E) --- p.34 / Chapter Chapter 3 --- p.36 / Chapter 3. --- Results --- p.36 / Chapter 3.1 --- BRE expression in C2C12 cells --- p.36 / Chapter 3.2 --- Comparative Proteomic Profile of BRE silenced C2C12 cells --- p.41 / Chapter 3.3 --- Effect of Silencing BRE on C2C12 cell Proliferation --- p.49 / Chapter 3.4 --- Effects of BRE over-expression in D122 cells --- p.54 / Chapter 3.5 --- BRE Expression in the Liver --- p.62 / Chapter 3.5.1 --- Histological Analysis of Liver Sections after 24 hours of CCL4 Insult --- p.62 / Chapter 3.5.2 --- BRE Expression in the Liver --- p.62 / Chapter 3.6 --- Histological Study of Liver Treated with CCL4 --- p.67 / Chapter 3.7 --- BRE Expression in Experimental Liver --- p.76 / Chapter Chapter 4 --- p.92 / Chapter 4. --- Discussion --- p.92 / Chapter 4.1 --- Expression of BRE in C2C12 --- p.92 / Chapter 4.2 --- The Regulatory Function of BRE --- p.96 / Chapter 4.3 --- The Relationship Between BRE and p53 --- p.98 / Chapter 4.4 --- The Relationship Between BRE and NFkB --- p.104 / Chapter 4.5 --- BRE Expression in Normal Control and CCL4 Treated Livers --- p.105 / Chapter 4.6 --- A Possible Explanation for the Necrosis Pattern Observed --- p.107 / Chapter 4.7 --- The Relationship Between BRE and the TNF Receptors --- p.109 / Chapter Chapter 5 --- p.112 / Chapter 5. --- Conclusion and Future Prospects --- p.112 / References --- p.116
26

The function of Bre gene in embryonic interdigital tissues.

January 2007 (has links)
Wong, Wan Man. / Thesis submitted in: December 2006. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 85-98). / Abstracts in English and Chinese. / Abstract --- p.i / Abstract in Chinese --- p.iii / Acknowledgements --- p.v / Lists of Figures and Tables --- p.vi / Table of Abbreviations --- p.xi / Table of Contents --- p.xv / Chapter Chapter I --- Introduction / Chapter 1.1 --- Brain and Reproductive Organ Expressed Gene --- p.1 / Chapter 1.2 --- Programmed cell death --- p.4 / Chapter 1.3 --- Limb development in mouse --- p.8 / Chapter 1.4 --- Role of BRE in apoptosis --- p.12 / Chapter 1.5 --- Role of programmed cell death in interdigital tissue regression --- p.14 / Chapter 1.6 --- Aim of study --- p.17 / Chapter Chpater II --- Materials and methods / Chapter 2.1 --- Mice --- p.18 / Chapter 2.2 --- In-situ hybridization / Chapter 2.2.1 --- Histology --- p.18 / Chapter 2.2.2 --- Preparation of riboprobe for in-situ hybridization --- p.19 / Chapter 2.2.3 --- In-situ hybridization --- p.20 / Chapter 2.3 --- Interdigital tissue culture --- p.21 / Chapter 2.4 --- Gene interference / Chapter 2.4.1 --- Construction of Bre-siRNA --- p.22 / Chapter 2.4.2 --- siRNA transfection of cultured interdigital cells --- p.23 / Chapter 2.5 --- Semi-quantitative RT-PCR / Chapter 2.5.1 --- Sample collection of interdigital cells and explants --- p.23 / Chapter 2.5.2 --- RNA isolation and extraction --- p.24 / Chapter 2.5.3 --- Reverse-transcription and cDNA synthesis --- p.25 / Chapter 2.5.4 --- Polymerase chain reaction --- p.26 / Chapter 2.6 --- Assay of cell viability by MTT --- p.28 / Chapter 2.7 --- Comparative proteomics --- p.30 / Chapter 2.7.1 --- Collection of interdigital cells --- p.30 / Chapter 2.7.2 --- Preparation of cell lysate --- p.31 / Chapter 2.7.3 --- Assay of protein concentration in cell lysate --- p.31 / Chapter 2.7.4 --- Two-dimensional gel electrophoresis --- p.33 / Chapter 2.7.5 --- Protein identification by mass fingerprinting --- p.36 / Chapter 2.8 --- Statistical Method --- p.38 / Chapter Chapter III --- Results / Chapter 3.1 --- Spatial and temporal expression of Bre in murine embryonic hindlimbs --- p.39 / Chapter 3.2 --- Expression of Bre isoforms in interdigital tissues --- p.45 / Chapter 3.3 --- Silencing of Bre expression by siRNA in interdigital cells --- p.49 / Chapter 3.4 --- Effect on viability of Bre-silenced interdigital cells by siRNA --- p.51 / Chapter 3.5 --- Comparative proteomic profile of Bre-silenced interdigital cultured cells --- p.53 / Chapter 3.6 --- Identification of proteins that were differentially expressed by MALDI- TOF --- p.71 / Chapter 3.7 --- The mRNA levels of proteins identified that were differentially expressed --- p.74 / Chapter Chapter IV --- Discussion --- p.77 / References --- p.85 / Appendices --- p.99 / Publication --- p.108
27

A comprehensive study of a novel anti-apoptotic gene, BRE. / CUHK electronic theses & dissertations collection

January 2004 (has links)
Li Qing. / "July 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (p. 161-192). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
28

Identification and characterization of novel FE65-interacting proteins.

January 2009 (has links)
Cheng, Wai Hang. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 76-88). / Abstract also in Chinese. / Acknowledgement --- p.i / 摘要 --- p.iii / List of Abbreviations --- p.iv / List of Figures --- p.vi / List of Tables --- p.vii / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- FE65 --- p.1 / Chapter 1.1.1 --- FE65 Protein Family and Their Structures --- p.2 / Chapter 1.1.1.2 --- PTB domains --- p.5 / Chapter 1.1.2 --- Expression Pattern of FE65 Proteins --- p.6 / Chapter 1.1.3 --- FE65 Family-Transgenic Animals --- p.7 / Chapter 1.1.4 --- Interacting Partners of FE65 --- p.8 / Chapter 1.1.4.1 --- "APP, APLPl and APLP2" --- p.9 / Chapter 1.1.4.2 --- LRP1 and ApoEr2 --- p.10 / Chapter 1.1.4.3 --- c-Abl --- p.11 / Chapter 1.1.4.4 --- Mena and EVL --- p.11 / Chapter 1.1.4.5 --- Tip60 --- p.12 / Chapter 1.1.4.6 --- SET --- p.12 / Chapter 1.1.4.7 --- Estrogen Receptor a --- p.13 / Chapter 1.1.4.8 --- Teashirt --- p.13 / Chapter 1.1.4.9 --- CP2/LSF/LBP1 --- p.13 / Chapter 1.1.4.10 --- Dexra sl --- p.14 / Chapter 1.1.4.11 --- P2X2-receptor subunit --- p.14 / Chapter 1.1.4.12 --- Tau --- p.15 / Chapter 1.1.4.13 --- Notchl --- p.15 / Chapter 1.1.4.14 --- Alcadein --- p.16 / Chapter 1.1.4.15 --- CD95/Fas/Apo -1 ligand --- p.16 / Chapter 1.1.4.16 --- p68 subunit of pre -mRNA cleavage and polyadenylation factor Im (p68 CFIm) --- p.17 / Chapter 1.1.4.17 --- Ataxinl --- p.17 / Chapter 1.1.5.1 --- FE65 as an adaptor protein --- p.20 / Chapter 1.1.5.2 --- FE65 and Alzheimer´ةs disease --- p.20 / Chapter 1.1.5.3 --- Transcriptional / Post-transcriptional regulation --- p.22 / Chapter 1.1.5.4 --- Apoptosis and cell cycle regulation --- p.23 / Chapter 1.1.5.5 --- Neuronal positioning and cell migration --- p.23 / Chapter 1.1.5.6 --- Learning and memory --- p.25 / Chapter 1.2 --- Objectives --- p.26 / Chapter Chapter 2 --- Investigation of the interaction between FE65 and Arf6 --- p.27 / Chapter 2.1 --- Materials --- p.27 / Chapter 2.1.1 --- DNA contructs --- p.27 / Chapter 2.1.2 --- Cell culture --- p.27 / Chapter 2.1.3 --- Immunoblotting --- p.28 / Chapter 2.1.4 --- Miscellaneous --- p.28 / Chapter 2.2 --- Methods --- p.29 / Chapter 2.2.1 --- Preparation of Escherichia coli competent cells --- p.29 / Chapter 2.2.2 --- DNA preparation with Intron Plasmid DNA --- p.30 / Chapter 2.2.3 --- DNA preparation with Macherey-Nagel NucleoBond Xtra Midi --- p.30 / Chapter 2.2.4 --- DNA preparation by the alkaline lysis method --- p.31 / Chapter 2.2.5 --- Spectrophotometric analysis of DNA --- p.32 / Chapter 2.2.6 --- Agarose gel electrophoresis --- p.32 / Chapter 2.2.7 --- Cell culture and transfection --- p.33 / Chapter 2.2.8 --- Bacterial GST-pull down assay --- p.33 / Chapter 2.2.9 --- GST-pull down assay for testing direct interaction between FE65 and Arf6 --- p.34 / Chapter 2.2.10 --- Mammalian GST-pull down assay --- p.35 / Chapter 2.2.11 --- Immunoprecipitation --- p.36 / Chapter 2.2.12 --- SDS-PAGE --- p.36 / Chapter 2.2.13 --- Immunoblotting --- p.39 / Chapter 2.3 --- Results --- p.40 / Chapter 2.3.1 --- Interaction between Arf6 and FE65 --- p.40 / Chapter 2.3.2 --- Determination of the interacting domain of FE65 with Arf6 --- p.43 / Chapter 2.3.3 --- Determination if FE65 and Arf6 interact directly --- p.45 / Chapter Chapter 3 --- Production of Antisera against Arf6 and Immunostaining of FE65-Arf6 --- p.47 / Chapter 3.1 --- Materials --- p.47 / Chapter 3.1.1 --- Protein expression and purification --- p.47 / Chapter 3.1.2 --- Immunization and harvest of antisera --- p.48 / Chapter 3.1.3 --- Immunostaining --- p.48 / Chapter 3.2 --- Methods --- p.48 / Chapter 3.2.1 --- Protein expression and purification --- p.48 / Chapter 3.2.2 --- Bradford assay --- p.50 / Chapter 3.2.3 --- Immunization --- p.50 / Chapter 3.2.4 --- Antibody purification --- p.51 / Chapter 3.2.5 --- Immunostaining --- p.52 / Chapter 3.3 --- Results --- p.53 / Chapter 3.3.1 --- Recombinant Arf6 expression and purification --- p.53 / Chapter 3.3.2 --- Titering of antisera --- p.57 / Chapter 3.3.3 --- Determination of antisera specificity --- p.59 / Chapter Chapter 4 --- Discussion --- p.68 / Chapter Chapter 5 --- Future Perspectives --- p.73 / References --- p.76
29

Expression of the formin Daam 1 in pyramidal neurons of the hippocampus affects spine morphology

Salomon, Steven. January 2006 (has links)
Formins, also known as formin homology (FH) proteins, are involved in a wide range of actin-mediated processes. The Diaphanous-related formin Daam1 (Dishevelled-associated activator of morphogenesis) interacts with the PDZ domain protein Dishevelled, and is required to establish planar cell polarity in Xenopus. Through a yeast two-hybrid screen, I characterized a PDZ-mediated interaction between the C-terminus of Daam1 and the PDZ domains 456 of GRIP1. In dissociated rat hippocampal cultures, Daam1 expression was seen throughout the soma and dendrites in a punctate pattern. Furthermore, co-staining with a synaptic marker suggests that Daam1 could be associated with post-synaptic specializations. Dendritic spines are enriched with actin filaments, and based on the subcellular localization of Daam1 and the evidence that formins are involved in regulating actin polymerization, I hypothesized that Daam1 might play a role in dendritic spine morphology. In order to investigate the functional roles for Daam1, viral vectors were developed using the Semliki-Forest defective viral vector to over-express the full-length Daam1 protein and a Daam1 lacking the PDZ-binding motif. The over-expression of the full-length Daam1 in organotypic hippocampal slices showed a punctate distribution throughout the dendritic shaft, with the occasional appearance in spines, resulting in an overall increase in dendritic spine length. This suggests that formins, such as Daam1, could potentially regulate spine morphology.
30

The role of NKX proteins in neuronal and glial specification /

Vallstedt, Anna, January 2004 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst., 2004. / Härtill 4 uppsatser.

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