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Abstract
The identification of markers expressed by pathological cells or their microenvironment would help to distinguish such cells from the normal tissues. The strategies derived from this theory can be a promising modality for imaging and treating diseases. LyP-1, a tumor homing peptide, can selectively bind to its receptor p32 protein overexpressed in various tumor-associated cells and atherosclerotic plaque macrophages. During recent decades, multiple types of LyP-1-based imaging probes and drug delivery systems have been designed and developed for diagnostic and therapeutic applications. This review first introduces LyP-1 and its receptor p32, as well as its homing, internalization and proapoptotic properties. Next, we highlight recent studies focusing on the applications of LyP-1-based strategies in the diagnosis and treatment of tumors, metastatic lesions, and atherosclerotic plaques. Finally, several limitations in the clinical translation of LyP-1-based bioconjugates are summarized.
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Affiliation(s)
- Ningning Song
- a Department of Nuclear Medicine , Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , People's Republic of China
| | - Lingzhou Zhao
- a Department of Nuclear Medicine , Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , People's Republic of China
| | - Meilin Zhu
- b School of Basic Medical Sciences, Ningxia Medical University , Yinchuan , People's Republic of China
| | - Jinhua Zhao
- a Department of Nuclear Medicine , Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai , People's Republic of China
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iRGD: A Promising Peptide for Cancer Imaging and a Potential Therapeutic Agent for Various Cancers. JOURNAL OF ONCOLOGY 2019; 2019:9367845. [PMID: 31346334 PMCID: PMC6617877 DOI: 10.1155/2019/9367845] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 06/04/2019] [Accepted: 06/11/2019] [Indexed: 12/11/2022]
Abstract
Poor penetration into the tumor parenchyma and the reduced therapeutic efficacy of anticancer drugs and other medications are the major problems in tumor treatment. A new tumor-homing and penetrating peptide, iRGD (CRGDK/RGPD/EC), can be effectively used to combine and deliver imaging agents or anticancer drugs into tumors. The different “vascular zip codes” expressed in different tissues can serve as targets for docking-based (synaptic) delivery of diagnostic and therapeutic molecules. αv-Integrins are abundantly expressed in the tumor vasculature, where they are recognized by peptides containing the RGD integrin recognition motif. The iRGD peptide follows a multistep tumor-targeting process: First, it is proteolytically cleaved to generate the CRGDK fragment by binding to the surface of cells expressing αv integrins (αvβ3 and αvβ5). Then, the fragment binds to neuropilin-1 and penetrates the tumor parenchyma more deeply. Compared with conventional RGD peptides, the affinity of iRGD for αv integrins is in the mid to low nanomolar range, and the CRGDK fragment has a stronger affinity for neuropilin-1 than that for αv integrins because of the C-terminal exposure of a conditional C-end Rule (CendR) motif (R/KXXR/K), whose receptor proved to be neuropilin-1. Consequently, these advantages facilitate the transfer of CRGDK fragments from integrins to neuropilin-1 and consequently deeper penetration into the tumor. Due to its specific binding and strong affinity, the iRGD peptide can deliver imaging agents and anticancer drugs into tumors effectively and deeply, which is useful in detecting the tumor, blocking tumor growth, and inhibiting tumor metastasis. This review aims to focus on the role of iRGD in the imaging and treatment of various cancers.
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Sharma S, Mann AP, Mölder T, Kotamraju VR, Mattrey R, Teesalu T, Ruoslahti E. Vascular changes in tumors resistant to a vascular disrupting nanoparticle treatment. J Control Release 2017; 268:49-56. [PMID: 29030222 PMCID: PMC5819600 DOI: 10.1016/j.jconrel.2017.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 09/27/2017] [Accepted: 10/06/2017] [Indexed: 12/11/2022]
Abstract
Anti-angiogenic and vascular disrupting therapies rely on the dependence of tumors on new blood vessels to sustain tumor growth. We previously reported a potent vascular disrupting agent, a theranostic nanosystem consisting of a tumor vasculature-homing peptide (CGKRK) fused to a pro-apoptotic peptide [D(KLAKLAK)2] coated on iron oxide nanoparticles. This nanosystem showed promising therapeutic efficacy in glioblastoma (GBM) and breast cancer models. However, complete control of the tumors was not achieved, and some tumors became non-responsive to the treatment. Here we examined the non-responder phenomenon in an aggressive MCF10-CA1a breast tumor model. In the treatment-resistant tumors we noted the emergence of CD31-negative patent neovessels and a concomitant loss of tumor homing of the nanosystem. In vivo phage library screening in mice bearing non-responder tumors showed that compared to untreated and treatment-sensitive tumors, treatment sensitive tumors yield a distinct landscape of vascular homing peptides characterized by over-representation of peptides that target αv integrins. Our approach may be generally applicable to the development of targeted therapies for tumors that have failed treatment.
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Affiliation(s)
- Shweta Sharma
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA
| | - Aman P Mann
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA
| | - Tarmo Mölder
- Laboratory of Cancer Biology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu 50411, Estonia
| | - Venkata Ramana Kotamraju
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA; Center for Nanomedicine and the Department of Cell, Molecular and Developmental Biology, University of California, Santa Barbara, CA, USA
| | - Robert Mattrey
- Radiology, Advanced Imaging Research Center, UT Southwestern Medical Center, Dallas, TX, USA
| | - Tambet Teesalu
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA; Laboratory of Cancer Biology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu 50411, Estonia; Center for Nanomedicine and the Department of Cell, Molecular and Developmental Biology, University of California, Santa Barbara, CA, USA
| | - Erkki Ruoslahti
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA; Center for Nanomedicine and the Department of Cell, Molecular and Developmental Biology, University of California, Santa Barbara, CA, USA.
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