Fast and precise diagnostic techniques are required for the treatment of many disorders.Biosensors are one of the diagnostic devices that are applicable in biological and medical sciences.Biosensors could be utilized ...Fast and precise diagnostic techniques are required for the treatment of many disorders.Biosensors are one of the diagnostic devices that are applicable in biological and medical sciences.Biosensors could be utilized to recognize biological molecules with high sensitivity.Biosensors are consisted of different components and have different types.Each type of biosensor is used in a particular field according to its specific features.Nanobodies are a novel class of antibodies with small size,high affinity,and specificity to their target.The unique properties of nanobodies make them appropriate tools for diagnostic applications.In this paper,we review biosensors,and their features and roles in medicine.Antibody/nanobody-based biosensors are also specifically discussed.展开更多
Early cancer diagnosis requires ultrasensitive detection of tumor markers in blood.To this end,we develop a novel microcantilever immunosensor using nanobodies(Nbs)as receptors.As the smallest antibody(Ab)entity compr...Early cancer diagnosis requires ultrasensitive detection of tumor markers in blood.To this end,we develop a novel microcantilever immunosensor using nanobodies(Nbs)as receptors.As the smallest antibody(Ab)entity comprising an intact antigen-binding site,Nbs achieve dense receptor layers and short distances between antigen-binding regions and sensor surfaces,which significantly elevate the generation and transmission of surface stress.Owing to the inherent thiol group at the C-terminus,Nbs are covalently immobilized on microcantilever surfaces in directed orientation via one-step reaction,which further enhances the stress generation.For microcantilever-based nanomechanical sensor,these advantages dramatically increase the sensor sensitivity.Thus,Nb-functionalized microcantilevers can detect picomolar concentrations of tumor markers with three orders of magnitude higher sensitivity,when compared with conventional Ab-functionalized microcantilevers.This proof-of-concept study demonstrates an ultrasensitive,label-free,rapid,and low-cost method for tumor marker detection.Moreover,interestingly,we find Nb inactivation on sensor interfaces when using macromolecule blocking reagents.The adsorption-induced inactivation is presumably caused by the change of interfacial properties,due to binding site occlusion upon complex coimmobilization formations.Our findings are generalized to any coimmobilization methodology for Nbs and,thus,for the construction of high-performance immuno-surfaces.展开更多
基金Pasteur Institute of Iran for supporting the current article
文摘Fast and precise diagnostic techniques are required for the treatment of many disorders.Biosensors are one of the diagnostic devices that are applicable in biological and medical sciences.Biosensors could be utilized to recognize biological molecules with high sensitivity.Biosensors are consisted of different components and have different types.Each type of biosensor is used in a particular field according to its specific features.Nanobodies are a novel class of antibodies with small size,high affinity,and specificity to their target.The unique properties of nanobodies make them appropriate tools for diagnostic applications.In this paper,we review biosensors,and their features and roles in medicine.Antibody/nanobody-based biosensors are also specifically discussed.
基金supported by the National Natural Science Foundation of China(Nos.11627803,11872355,and 12072339)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB22040502).
文摘Early cancer diagnosis requires ultrasensitive detection of tumor markers in blood.To this end,we develop a novel microcantilever immunosensor using nanobodies(Nbs)as receptors.As the smallest antibody(Ab)entity comprising an intact antigen-binding site,Nbs achieve dense receptor layers and short distances between antigen-binding regions and sensor surfaces,which significantly elevate the generation and transmission of surface stress.Owing to the inherent thiol group at the C-terminus,Nbs are covalently immobilized on microcantilever surfaces in directed orientation via one-step reaction,which further enhances the stress generation.For microcantilever-based nanomechanical sensor,these advantages dramatically increase the sensor sensitivity.Thus,Nb-functionalized microcantilevers can detect picomolar concentrations of tumor markers with three orders of magnitude higher sensitivity,when compared with conventional Ab-functionalized microcantilevers.This proof-of-concept study demonstrates an ultrasensitive,label-free,rapid,and low-cost method for tumor marker detection.Moreover,interestingly,we find Nb inactivation on sensor interfaces when using macromolecule blocking reagents.The adsorption-induced inactivation is presumably caused by the change of interfacial properties,due to binding site occlusion upon complex coimmobilization formations.Our findings are generalized to any coimmobilization methodology for Nbs and,thus,for the construction of high-performance immuno-surfaces.
