Manipulating PTPRD function with ectodomain antibodies

Qian, Zhe, Song, Dongyan, Ipsaro, Jonathan J, Bautista, Carmelita, Joshua-Tor, Leemor, Yeh, Johannes T-H, Tonks, Nicholas K (September 2023) Manipulating PTPRD function with ectodomain antibodies. Genes and Development. ISSN 0890-9369

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Abstract

Protein tyrosine phosphatases (PTPs) are critical regulators of signal transduction but have yet to be exploited fully for drug development. Receptor protein tyrosine phosphatase δ (RPTPδ/PTPRD) has been shown to elicit tumor-promoting functions, including elevating SRC activity and promoting metastasis in certain cell contexts. Dimerization has been implicated in the inhibition of receptor protein tyrosine phosphatases (RPTPs). We have generated antibodies targeting PTPRD ectodomains with the goal of manipulating their dimerization status ectopically, thereby regulating intracellular signaling. We have validated antibody binding to endogenous PTPRD in a metastatic breast cancer cell line, CAL51, and demonstrated that a monoclonal antibody, RD-43, inhibited phosphatase activity and induced the degradation of PTPRD. Similar effects were observed following chemically induced dimerization of its phosphatase domain. Mechanistically, RD-43 triggered the formation of PTPRD dimers in which the phosphatase activity was impaired. Subsequently, the mAb-PTPRD dimer complex was degraded through lysosomal and proteasomal pathways, independently of secretase cleavage. Consequently, treatment with RD-43 inhibited SRC signaling and suppressed PTPRD-dependent cell invasion. Together, these findings demonstrate that manipulating RPTP function via antibodies to the extracellular segments has therapeutic potential.

Item Type:	Paper
Subjects:	bioinformatics diseases & disorders > cancer diseases & disorders bioinformatics > genomics and proteomics > genetics & nucleic acid processing bioinformatics > genomics and proteomics bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification diseases & disorders > cancer > cancer types > breast cancer organs, tissues, organelles, cell types and functions > cell types and functions > cell types > cell line organs, tissues, organelles, cell types and functions > cell types and functions > cell types > cell line organs, tissues, organelles, cell types and functions > cell types and functions > cell types > cell line organs, tissues, organelles, cell types and functions > cell types and functions > cell types organs, tissues, organelles, cell types and functions > cell types and functions > cell types organs, tissues, organelles, cell types and functions > cell types and functions > cell types organs, tissues, organelles, cell types and functions > cell types and functions bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > enzymes organs, tissues, organelles, cell types and functions bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types organs, tissues, organelles, cell types and functions > tissues types and functions > signal transduction organs, tissues, organelles, cell types and functions > tissues types and functions diseases & disorders > cancer > cancer types bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > enzymes > protein tyrosine phosphatase
CSHL Authors:	Song, Dongyan Ipsaro, Jonathan J. Bautista, Carmelita Joshua-Tor, Leemor Yeh, Johannes Tonks, Nicholas K. Qian, Zhe
Communities:	CSHL labs > Joshua-Tor lab CSHL labs > Krainer lab CSHL labs > Tonks lab CSHL labs > Yeh Lab CSHL Cancer Center Program CSHL Cancer Center Program > Cellular Communication in Cancer Program CSHL Cancer Center Program > Gene Regulation and Inheritance Program CSHL Cancer Center Shared Resources > Flow Cytometry Service CSHL Cancer Center Shared Resources > Microscopy Service
SWORD Depositor:	CSHL Elements
Depositing User:	CSHL Elements
Date:	5 September 2023
Date Deposited:	19 Sep 2023 17:31
Last Modified:	09 Feb 2024 15:46
PMCID:	PMC10546974
Related URLs:	Publisher
URI:	https://repository.cshl.edu/id/eprint/40913

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