Add like
Add dislike
Add to saved papers

Multivalent targeting and killing of HER2 overexpressing breast carcinoma cells with methotrexate-encapsulated tetra-specific non-overlapping variable domain heavy chain anti-HER2 antibody-PEG-liposomes: In vitro proof-of-concept.

The variable domain of the heavy chain antibodies (VHHs) is the smallest (15 kDa) intact single domain antigen-binding fragment. VHHs often exhibit sub-nanomolar affinity for their designated targets and therefore are receiving increasing attention in molecular targeting and nanomedicine engineering. We cloned and expressed four non-overlapping anti-HER2 VHHs in a prokaryotic expression system that yielded disulfide-bonded VHHs. Purified VHHs, before and after thiolation, were characterized by Western blot and their functionality against the ecto-domain of HER2 receptor was confirmed by ELISA and flow cytometry. Thiolated VHHs were conjugated to the reactive maleimide-PEG2000 -distearoylphosphatidylethanolamine incorporated into the bilayer of small unilamellar vesicles. We show high target-binding avidity and efficient cytotoxicity of optimized tetra-specific multivalent methatoraxate-loaded VHH-PEG-liposomes (55-60 VHH/vesicle) in HER2 over-expressing breast carcinoma cell lines compared with the best performing monoclonal VHH conjugated vesicles of identical VHH surface density. The VHH expression and production methodology as well as the synergistic effect of the four non-overlapping VHHs in HER2 binding provides an efficient approach for design and engineering of anti-cancer nanomedicines and their future applications within the context of personalized and precision therapies and diagnostics are discussed.

Full text links

We have located links that may give you full text access.
Can't access the paper?
Try logging in through your university/institutional subscription. For a smoother one-click institutional access experience, please use our mobile app.

For the best experience, use the Read mobile app

Mobile app image

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app

All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.

By using this service, you agree to our terms of use and privacy policy.

Your Privacy Choices Toggle icon

You can now claim free CME credits for this literature searchClaim now

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app