期刊
BIOMEDICINES
卷 10, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/biomedicines10102605
关键词
chlorotoxin; Lqh-8/6; glioma cells; apoptosis; doxorubicin; conjugation; click chemistry
资金
- French Agence Nationale de la Recherche grant for Laboratory of Excellence Ion Channels, Science and Therapeutics [ANR-11-LABX-0015]
- Region Pays de la Loire (nouvelle equipe) [2016-11092/11093]
Natural peptide analogs of chlorotoxin, including Lqh-8/6, were synthesized and evaluated for their ability to label, detect, and inhibit glioma growth. It was found that a biotinylated version of Lqh-8/6 could label glioma cell lines and detect glioma in brain sections. Lqh-8/6 exhibited anti-invasive properties and was non-toxic to glioma cells. Moreover, the conjugation of doxorubicin to Lqh-8/6 efficiently induced apoptosis in glioma cells.
Natural peptides isolated from animal venoms generally target cell surface receptors with high affinity and selectivity. On many occasions, some of these receptors are over-expressed in cancer cells. Herein, we identified Lqh-8/6 as a natural peptide analog of chlorotoxin, a proven and useful compound for the diagnosis and treatment of glioma. Lqh-8/6 and two other natural analogues were chemically synthesized for the first time and evaluated for their ability to label, detect and prevent glioma growth in vitro. We demonstrate that a biotinylated version of Lqh-8/6 allows both the labeling of glioma cell lines and the detection of glioma in brain sections of glioma allograft Fisher rats. Lqh-8/6 has intrinsic anti-invasive properties but is non-toxic to glioma cells. To confer anti-tumor properties to Lqh-8/6, we chemically coupled doxorubicin to the glioma-targeting peptide using click chemistry. To this end, we successfully chemically synthesized Lqh-8/6-azide and doxorubicin-alkyne without impairing the toxic nature of doxorubicin. The toxin-drug conjugate efficiently promotes the apoptosis of glioma cells in vitro. This example contributes to the concept that animal venom peptides constitute exquisite warheads for delivering toxic chemical conjugates, a parallel to the popular concept of antibody-drug conjugates for the treatment of cancer.
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