from I - Dendritic cells and their role in immunity
Published online by Cambridge University Press: 12 August 2009
INTRODUCTION
Toll-like receptors (TLRs) play essential roles in innate immune responses. The name TLR is derived from a Drosophila protein, Toll, which detects fungal infection in the fruit fly. The immune system in Drosophila is entirely dependent on a limited number of germline-encoded receptors for pathogen recognition. In contrast, the vertebrate immune system is characterized by the evolution of acquired immunity in addition to innate immunity. Acquired immunity is mediated by T and B cells, which utilize rearranged receptors. This system is advantageous for detecting pathogens with high specificity, eradicating infection in the late stages and establishing an immunological memory. However, the mammalian innate immune system plays critical roles in the initial defense against invading pathogens and subsequent activation of the acquired immune system. Innate immune cells, such as macrophages and dendritic cells (DCs), sense pathogens through TLRs, phagocytose them and evoke immune responses.
To date, 12 different TLRs have been reported in either humans or mice. The innate immunity system targets a set of molecular structures that are unique to microorganisms and shared by various pathogens, but absent from host cells. By recognizing these “pathogen-specific” patterns, the innate immunity system is able to prevent autoimmune responses. Members of the TLR family of proteins are characterized by extracellular leucine-rich repeat (LRR) motifs responsible for ligand recognition, a transmembrane region and a cytoplasmic tail containing a Toll/IL-1 receptor homology (TIR) domain.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.