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Optimal composition and position of histidine-containing tags improves biodistribution of 99mTc-labeled DARPin G3

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dc.contributor.authorVorobyeva, A.
dc.contributor.authorSchulga, A.
dc.contributor.authorKonovalova, E.
dc.contributor.authorGuler, R.
dc.contributor.authorDeyev, S. M.
dc.contributor.authorДеев, Сергей Михайлович
dc.date.accessioned2024-11-21T09:58:23Z
dc.date.available2024-11-21T09:58:23Z
dc.date.issued2019
dc.description.abstract© 2019, The Author(s).Radionuclide molecular imaging of HER2 expression in disseminated cancer enables stratification of patients for HER2-targeted therapies. DARPin G3, a small (14 kDa) engineered scaffold protein, is a promising probe for imaging of HER2. We hypothesized that position (C- or N-terminus) and composition (hexahistidine or (HE)3) of histidine-containing tags would influence the biodistribution of [99mTc]Tc(CO)3-labeled DARPin G3. To test the hypothesis, G3 variants containing tags at N-terminus (H6-G3 and (HE)3-G3) or at C-terminus (G3-H6 and G3-(HE)3) were labeled with [99mTc]Tc(CO)3. Labeling yield, label stability, specificity and affinity of the binding to HER2, biodistribution and tumor targeting properties of these variants were compared side-by-side. There was no substantial influence of position and composition of the tags on binding of [99mTc]Tc(CO)3-labeled variants to HER2. The specificity of HER2 targeting in vivo was confirmed. The tumor uptake in BALB/c nu/nu mice bearing SKOV3 xenografts was similar for all variants. On the opposite, there was a strong influence of the tags on uptake in normal tissues. The tumor-to-liver ratio for [99mTc]Tc(CO)3-(HE)3-G3 was three-fold higher compared to the hexahistidine-tag containing variants. Overall, [99mTc]Tc(CO)3-(HE)3-G3 variant provided the highest tumor-to-lung, tumor-to-liver, tumor-to-bone and tumor-to-muscle ratios, which should improve sensitivity of HER2 imaging in these common metastatic sites.
dc.identifier.citationOptimal composition and position of histidine-containing tags improves biodistribution of 99mTc-labeled DARPin G3 / Vorobyeva, A. [et al.] // Scientific Reports. - 2019. - 9. - № 1. - 10.1038/s41598-019-45795-8
dc.identifier.doi10.1038/s41598-019-45795-8
dc.identifier.urihttps://www.doi.org/10.1038/s41598-019-45795-8
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85068108800&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000473130000026
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/18336
dc.relation.ispartofScientific Reports
dc.titleOptimal composition and position of histidine-containing tags improves biodistribution of 99mTc-labeled DARPin G3
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue1
oaire.citation.volume9
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relation.isAuthorOfPublication.latestForDiscovery66f50b35-0e92-49e0-ad1a-0ac386d858b7
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