Synthesis, characterization and systematic comparison of FITC‐labelled GnRH‐I, ‐II and ‐III analogues on various tumour cells. (August 2016)

• Record Type: Journal Article
• Authors: Murányi, József; Gyulavári, Pál; Varga, Attila; Bökönyi, Györgyi; Tanai, Henriette; Vántus, Tibor; Pap, Domonkos; Ludányi, Krisztina; Mező, Gábor; Kéri, György
• Is Part Of: Journal of peptide science. Volume 22:Number 8(2016:Aug.)
• Page Start: 552
• Page End: 560
• Publication Date: 2016-08
• Subjects: targeted therapy -- GnRH -- LHRH -- FITC -- conjugate -- pharynx tumour -- Detroit‐562; Peptides -- Periodicals; Peptides -- Periodicals; 572.65
• DOI: 10.1002/psc.2904
• Languages: English
• ISSNs: 1075-2617

Abstract

Abstract : Targeted tumour therapy is the focus of recent cancer research. Gonadotropin‐releasing hormone (GnRH) analogues are able to deliver anticancer agents selectively into tumour cells, which highly express GnRH receptors. However, the effectiveness of different analogues as targeting moiety in drug delivery systems is rarely compared, and the investigated types of cancer are also limited. Therefore, we prepared selectively labelled, fluorescent derivatives of GnRH‐I, ‐II and ‐III analogues, which were successfully used for drug targeting. In this manuscript, we investigated these analogues' solubility, stability and passive membrane permeability and compared their cellular uptake by various cancer cells. We found that these labelled GnRH conjugates provide great detectability, without undesired cytotoxicity and passive membrane permeability. The introduced experiments with these conjugates proved their reliable tracking, quantification and comparison. Cellular uptake efficiency was studied on human breast, colon, pancreas and prostate cancer cells (MCF‐7, HT‐29, BxPC‐3, LNCaP) and on dog kidney cells (Madin–Darby canine kidney). Each of the three conjugates was taken up by GnRH‐I receptor‐expressing cells, but the different cells preferred different analogues. Furthermore, we demonstrated for the first time the high cell surface expression of GnRH‐I receptors and the effective cellular uptake of GnRH analogues on human pharynx tumour (Detroit‐562) cells. In summary, our presented results detail that the introduced conjugates could be innovative tools for the examination of the GnRH‐based drug delivery systems on various cells and offer novel information about these peptides. Copyright © 2016 European Peptide Society and John Wiley & Sons, Ltd. Abstract : Confocal laser scanning microscopy image of Detroit‐562 human pharynx tumour cells (blue) after 5 h of incubation with 10 μM Lys 8 (FITC)]‐GnRH‐III (green). Selectively labelled fluorescent GnRH‐I, ‐II and ‐III derivatives are reliable tools for tracking and quantifying their receptor‐mediated cellular uptake in vitro and able to predict the corresponding GnRH‐drug conjugate tumour targeting efficiency in vivo . We demonstrate for the first time that human pharynx tumour (Detroit‐562) cells highly express GnRH‐I receptors on their surface. Cellular uptake experiments with these labelled GnRH conjugates proved that the transport for each of the three GnRH analogues into Detroit‐562 cells is efficiently mediated by the GnRH‐I receptor.