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Incorporation of a Hydrophilic Spacer Reduces Hepatic Uptake of HER2-Targeting Affibody-DM1 Drug Conjugates
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Protein Engineering.ORCID iD: 0000-0003-1093-8222
Uppsala Univ, Dept Immunol Genet & Pathol, S-75185 Uppsala, Sweden..
Uppsala Univ, Dept Med Chem, S-75123 Uppsala, Sweden..
Uppsala Univ, Dept Immunol Genet & Pathol, S-75185 Uppsala, Sweden..
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2019 (English)In: Cancers, ISSN 2072-6694, Vol. 11, no 8, article id 1168Article in journal (Refereed) Published
Abstract [en]

Affibody molecules are small affinity-engineered scaffold proteins which can be engineered to bind to desired targets. The therapeutic potential of using an affibody molecule targeting HER2, fused to an albumin-binding domain (ABD) and conjugated with the cytotoxic maytansine derivate MC-DM1 (AffiDC), has been validated. Biodistribution studies in mice revealed an elevated hepatic uptake of the AffiDC, but histopathological examination of livers showed no major signs of toxicity. However, previous clinical experience with antibody drug conjugates have revealed a moderateto high-grade hepatotoxicity in treated patients, which merits efforts to also minimize hepatic uptake of the AffiDCs. In this study, the aim was to reduce the hepatic uptake of AffiDCs and optimize their in vivo targeting properties. We have investigated if incorporation of hydrophilic glutamate-based spacers adjacent to MC-DM1 in the AffiDC, (Z(HER2:2891))(2) -ABD-MC-DM1, would counteract the hydrophobic nature of MC-DM1 and, hence, reduce hepatic uptake. Two new AffiDCs including either a triglutamate-spacer-, (Z(HER2:2891))(2)-ABD-E-3-MC-DM1, or a hexaglutamate-spacer-, (Z(HER2:2891))(2)-ABD-E-6-MC-DM1 next to the site of MC-DM1 conjugation were designed. We radiolabeled the hydrophilized AffiDCs and compared them, both in vitro and in vivo, with the previously investigated (Z(HER2:2891))(2)-ABD-MC-DM1 drug conjugate containing no glutamate spacer. All three AffiDCs demonstrated specific binding to HER2 and comparable in vitro cytotoxicity. A comparative biodistribution study of the three radiolabeled AffiDCs showed that the addition of glutamates reduced drug accumulation in the liver while preserving the tumor uptake. These results confirmed the relation between DM1 hydrophobicity and liver accumulation. We believe that the drug development approach described here may also be useful for other affinity protein-based drug conjugates to further improve their in vivo properties and facilitate their clinical translatability.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 11, no 8, article id 1168
Keywords [en]
affibody, drug conjugates, hepatic uptake, DM1
National Category
Medical Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-261042DOI: 10.3390/cancers11081168ISI: 000484438000128PubMedID: 31416167Scopus ID: 2-s2.0-85071755584OAI: oai:DiVA.org:kth-261042DiVA, id: diva2:1356689
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QC 20191002

Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved

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Ding, HaozhongGräslund, Torbjörn

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