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A nucleoside-modified messenger RNA (modRNA) is a synthetic messenger RNA (mRNA) in which some nucleosides are replaced by other naturally modified nucleosides or by synthetic nucleoside analogues. [ 1 ] modRNA is used to induce the production of a desired protein in certain cells. An important application is the development of mRNA vaccines ...
An mRNAvaccine is a type of vaccine that uses a copy of a molecule called messenger RNA (mRNA) to produce an immune response. [ 1 ] The vaccine delivers molecules of antigen -encoding mRNA into cells, which use the designed mRNA as a blueprint to build foreign protein that would normally be produced by a pathogen (such as a virus) or by a ...
A DNA vaccine is a type of vaccine that transfects a specific antigen -coding DNA sequence into the cells of an organism as a mechanism to induce an immune response. [1][2] DNA vaccines work by injecting genetically engineered plasmid containing the DNA sequence encoding the antigen (s) against which an immune response is sought, so the cells ...
SM-102 is a synthetic amino lipid which is used in combination with other lipids to form lipid nanoparticles. [1] These are used for the delivery of mRNA-based vaccines, [2][3][4] and in particular SM-102 forms part of the drug delivery system for the Moderna COVID-19 vaccine. [5][6][7] Lipid nanoparticles are an extension of earlier RNA ...
Cell-based vaccine. Cell-based vaccines are developed from mammalian or more rarely avian or insect cell lines rather than the more common method which uses the cells in embryonic chicken eggs to develop the antigens. [1] The potential use of cell culture techniques in developing viral vaccines has been widely investigated in the 2000s as a ...
Preservatives prevent the growth of bacteria and fungi, and are more commonly used in vaccines produced as multi-dose vials. They must also be non-toxic in the dose used and not adversely affect the immunogenicity of the vaccine. [29] Thiomersal is the best known and most controversial preservative. It was phased out of UK vaccines between 2003 ...
Liposome. Scheme of a liposome formed by phospholipids in an aqueous solution. Liposomes are composite structures made of phospholipids and may contain small amounts of other molecules. Though liposomes can vary in size from low micrometer range to tens of micrometers, unilamellar liposomes, as pictured here, are typically in the lower size ...
A lipid nanoparticle is typically spherical with an average diameter between 10 and 1000 nanometers. Solid lipid nanoparticles possess a solid lipid core matrix that can solubilize lipophilic molecules. The lipid core is stabilized by surfactants (emulsifiers). The emulsifier used depends on administration routes and is more limited for ...