Sökning: "antisense agents"

Visar resultat 1 - 5 av 15 avhandlingar innehållade orden antisense agents.

1. 1. Conformationally Constrained Nucleosides : Design, Synthesis, and Biochemical Evaluation of Modified Antisense Oligonucleotides

   Författare :Oommen P. Varghese; Lars Engman; Jacek Stawinski; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; chemically modified oligonucleotides; azetidine; aza-ENA-T; cyanomethylene locked; free energy of activation; diaxial interactions; chair conformation; stable duplex; human serum; snake venom phosphodiesterase; antisense agents; RNase H; Organisk kemi; Chemistry; Kemi;

   Sammanfattning : This thesis is concerned with synthesis, structure and biochemical analysis of chemically modified oligonucleotides with potential therapeutic applications. The three types of chemical modifications described here are: (a) A North-East locked 1',2'-azetidine nucleoside (b) A North locked 2',4'-cyanomethylene bridged nucleoside and (c) A 2',4'-aza-ENA-T nucleoside. LÄS MER

3. 2. Bacterial gene expression inhibition with antisense peptide nucleic acids

   Författare :Rikard Dryselius; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Regulated gene expression is widely useful for gene function studies and as a means to control genes important in disease. There are many methods for regulating the expression of genes, and one approach is to use antisense oligonucleotides that bind complementary mRNAs to inhibit translation. LÄS MER

4. 3. Radiolabelled Oligonucleotides for Evaluation of in vivo Hybridisation Utilising PET Methodology

   Författare :Gábor Lendvai; Mats Bergström; Sergio Estrada; Barbro Eriksson; Raymond Josephsson; Bertrand Tavitian; Uppsala universitet; []
   Nyckelord :Molecular medicine; Gene expression; Antisense oligonucleotides; Positron emission tomography; In vivo hybridisation; In vivo biodistribution; Chromogranin-A; 68Ga; RT-PCR; Scavenger receptors; Molekylärmedicin;

   Sammanfattning : Antisense oligonucleotides (ODN) may interfere in gene expression on the basis of hybridising to its complementary messenger RNA (mRNA) sequence in the cell thereby preventing the synthesis of the peptide. Therefore, these ODNs may be potential drugs to treat human diseases by “knocking down” the expression of responsible genes or correcting the maturation process of mRNA in the field called antisense therapy. LÄS MER

5. 4. Delivery of gene-regulating agents : internalization mechanisms and novel vectors

   Författare :Per Lundin; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : The sequencing of the human genome was expected to generate a veritable explosion of therapeutics for regulation of gene function, either through modulation of gene expression or through the replacement of defect genes. However, nucleic acid-based pharmacological agents suffer from issues of low bioavailability and unfavorable pharmacokinetics, wherefore these prospects have not yet been realized. LÄS MER

7. 5. Chemically Modified Oligonucleotides: Synthesis, Physicochemical and Biochemical Properties of their Duplexes with DNA and RNA

   Författare :Pushpangadan Indira Pradeepkumar; Jyoti Chattopadhyaya; Jesper Wengel; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bioorganic chemistry; Antisense oligonucleotides; Dipyridophenazine; Oxetane; RNase H; Gene down-regulation; DNase 1; Charge transport; Bioorganisk kemi; Bioorganic chemistry; Bioorganisk kemi;

   Sammanfattning : This thesis is based on 9 papers dealing with the synthesis, physicochemical and biochemical properties of two types of chemically modified oligonucleotides which have the potential to down-regulate gene expression: (i) The first set is comprised of antisense oligonucleotides (AONs) conjugated with different chromophores of varying size, charge and π-electron density. Conjugation of the chromophores at the 3'- or 5'-end enhanced the target RNA binding affinity and RNase H recruitment capabilities compared to the native counterpart without changing the global helical conformation of their AON/RNA hybrid duplexes. LÄS MER