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Tailored tetravalent antibodies potently and specifically activate Wnt/Frizzled pathways in cells, organoids and mice
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Tailored tetravalent antibodies potently and specifically activate Wnt/Frizzled pathways in cells, organoids and mice
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Journal Article
Tailored tetravalent antibodies potently and specifically activate Wnt/Frizzled pathways in cells, organoids and mice
2019
Overview
Secreted Wnt proteins regulate development and adult tissue homeostasis by binding and activating cell-surface Frizzled receptors and co-receptors including LRP5/6. The hydrophobicity of Wnt proteins has complicated their purification and limited their use in basic research and as therapeutics. We describe modular tetravalent antibodies that can recruit Frizzled and LRP5/6 in a manner that phenocopies the activities of Wnts both in vitro and in vivo. The modular nature of these synthetic Frizzled and LRP5/6 Agonists, called FLAgs, enables tailored engineering of specificity for one, two or multiple members of the Frizzled family. We show that FLAgs underlie differentiation of pluripotent stem cells, sustain organoid growth, and activate stem cells in vivo. Activation of Wnt signaling circuits with tailored FLAgs will enable precise delineation of functional outcomes directed by distinct receptor combinations and could provide a new class of therapeutics to unlock the promise of regenerative medicine.
Publisher
eLife Science Publications, Ltd,eLife Sciences Publications, Ltd,eLife Sciences Publications Ltd
Subject
/ antibody
/ Biochemistry and Chemical Biology
/ frizzled
/ Frizzled Receptors - agonists
/ Humans
/ Low Density Lipoprotein Receptor-Related Protein-5 - agonists
/ Low Density Lipoprotein Receptor-Related Protein-6 - agonists
/ Mice
/ organoid
/ Organoids - growth & development
/ Pluripotent Stem Cells - drug effects
/ Pluripotent Stem Cells - physiology
/ Proteins
/ Wnt
