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1.
Sci Rep ; 14(1): 16086, 2024 Jul 12.
Artigo em Inglês | MEDLINE | ID: mdl-38992064

RESUMO

The classical amyloid cascade hypothesis postulates that the aggregation of amyloid plaques and the accumulation of intracellular hyperphosphorylated Tau tangles, together, lead to profound neuronal death. However, emerging research has demonstrated that soluble amyloid-ß oligomers (SAßOs) accumulate early, prior to amyloid plaque formation. SAßOs induce memory impairment and disrupt cognitive function independent of amyloid-ß plaques, and even in the absence of plaque formation. This work describes the development and characterization of a novel anti-SAßO (E3) nanobody generated from an alpaca immunized with SAßO. In-vitro assays and in-vivo studies using 5XFAD mice indicate that the fluorescein (FAM)-labeled E3 nanobody recognizes both SAßOs and amyloid-ß plaques. The E3 nanobody traverses across the blood-brain barrier and binds to amyloid species in the brain of 5XFAD mice. Imaging of mouse brains reveals that SAßO and amyloid-ß plaques are not only different in size, shape, and morphology, but also have a distinct spatial distribution in the brain. SAßOs are associated with neurons, while amyloid plaques reside in the extracellular matrix. The results of this study demonstrate that the SAßO nanobody can serve as a diagnostic agent with potential theragnostic applications in Alzheimer's disease.


Assuntos
Doença de Alzheimer , Peptídeos beta-Amiloides , Placa Amiloide , Anticorpos de Domínio Único , Animais , Peptídeos beta-Amiloides/metabolismo , Peptídeos beta-Amiloides/imunologia , Anticorpos de Domínio Único/imunologia , Anticorpos de Domínio Único/química , Camundongos , Placa Amiloide/metabolismo , Doença de Alzheimer/metabolismo , Humanos , Encéfalo/metabolismo , Encéfalo/patologia , Barreira Hematoencefálica/metabolismo , Camundongos Transgênicos , Camelídeos Americanos , Modelos Animais de Doenças
2.
Res Sq ; 2024 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-38559050

RESUMO

The classical amyloid cascade hypothesis postulates that the aggregation of amyloid plaques and the accumulation of intracellular hyperphosphorylated Tau tangles, together, lead to profound neuronal death. However, emerging research has demonstrated that soluble amyloid-ß oligomers (SAßOs) accumulate early, prior to amyloid plaque formation. SAßOs induce memory impairment and disrupt cognitive function independent of amyloid-ß plaques, and even in the absence of plaque formation. This work describes the development and characterization of a novel anti-SAßO (E3) nanobody generated from an alpaca immunized with SAßO. In-vitro assays and in-vivo studies using 5XFAD mice indicate that the fluorescein (FAM)-labeled E3 nanobody recognizes both SAßOs and amyloid-ß plaques. The E3 nanobody traverses across the blood-brain barrier and binds to amyloid species in the brain of 5XFAD mice. Imaging of mouse brains reveals that SAßO and amyloid-ß plaques are not only different in size, shape, and morphology, but also have a distinct spatial distribution in the brain. SAßOs are associated with neurons, while amyloid plaques reside in the extracellular matrix. The results of this study demonstrate that the SAßO nanobody can serve as a diagnostic agent with potential theragnostic applications in Alzheimer's disease.

3.
J Cardiovasc Pharmacol ; 80(3): 342-353, 2022 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-34840268

RESUMO

ABSTRACT: Understanding the activation of G protein-coupled receptors (GPCRs) is of paramount importance to the field of cardiovascular medicine due to the critical physiological roles of these receptors and their prominence as drug targets. Although many cardiovascular GPCRs have been extensively studied as model receptors for decades, new complexities in their regulation continue to emerge. As a result, there is an ongoing need to develop novel approaches to monitor and to modulate GPCR activation. In less than a decade, nanobodies, or recombinant single-domain antibody fragments from camelids, have become indispensable tools for interrogating GPCRs both in purified systems and in living cells. Nanobodies have gained traction rapidly due to their biochemical tractability and their ability to recognize defined states of native proteins. Here, we review how nanobodies have been adopted to elucidate the structure, pharmacology, and signaling of cardiovascular GPCRs, resolving long-standing mysteries and revealing unexpected mechanisms. We also discuss how advancing technologies to discover nanobodies with tailored specificities may expand the impact of these tools for both basic science and therapeutic applications.


Assuntos
Anticorpos de Domínio Único , Receptores Acoplados a Proteínas G/metabolismo , Transdução de Sinais , Anticorpos de Domínio Único/química , Anticorpos de Domínio Único/metabolismo
4.
J Vis Exp ; (145)2019 03 07.
Artigo em Inglês | MEDLINE | ID: mdl-30907885

RESUMO

The Solute Carrier 4 (SLC4) family of proteins is called the bicarbonate transporters and includes the archetypal protein Anion Exchanger 1 (AE1, also known as Band 3), the most abundant membrane protein in the red blood cells. The SLC4 family is homologous with borate transporters, which have been characterized in plants and fungi. It remains a significant technical challenge to express and purify membrane transport proteins to homogeneity in quantities suitable for structural or functional studies. Here we describe detailed procedures for the overexpression of borate transporters in Saccharomyces cerevisiae, isolation of yeast membranes, solubilization of protein by detergent, and purification of borate transporter homologs from S. cerevisiae, Arabidopsis thaliana, and Oryza sativa. We also detail a glutaraldehyde cross-linking experiment to assay multimerization of homomeric transporters. Our generalized procedures can be applied to all three proteins and have been optimized for efficacy. Many of the strategies developed here can be utilized for the study of other challenging membrane proteins.


Assuntos
Boratos/metabolismo , Células Eucarióticas/metabolismo , Proteínas de Membrana Transportadoras/isolamento & purificação , Proteínas de Membrana Transportadoras/metabolismo , Arabidopsis/metabolismo , Cromatografia em Gel , Reagentes de Ligações Cruzadas/metabolismo , Transporte de Íons , Oryza/metabolismo , Saccharomyces cerevisiae/metabolismo , Solubilidade
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