Matricellular TSP-1 as a target of interest for impeding melanoma spreading: towards a therapeutic use for TAX2 peptide

Abstract : Thrombospondin-1 (TSP-1) is a matricellular glycoprotein known for being highly expressed within a tumor microenvironment, where it promotes an aggressive phenotype particularly by interacting with the CD47 cell-surface receptor. While it originates from the stromal compartment in many malignancies, melanoma is an exception as invasive and metastatic melanoma cells overexpress TSP-1. We recently demonstrated that a new molecular agent that selectively prevents TSP-1 binding to CD47, called TAX2, exhibits anti-cancer properties when administered systemically by decreasing viable tumor tissue within subcutaneous B16 melanoma allografts. At the same time, emerging evidence was published suggesting a contribution of TSP-1 in melanoma metastatic dissemination and resistance to treatment. Through a comprehensive systems biology approach based on multiple genomics and proteomics databases analyses, we first identified a TSP-1-centered interaction network that is overexpressed in metastatic melanoma. Then, we investigated the effects of disrupting TSP-1:CD47 interaction in A375 human malignant melanoma xenografts. In this model, TAX2 systemic administrations induce tumor necrosis by decreasing intra-tumoral blood flow, while concomitantly making tumors less infiltrative. Besides, TAX2 treatment also drastically inhibits B16F10 murine melanoma cells metastatic dissemination and growth in a syngeneic experimental model of lung metastasis, as demonstrated by histopathological analyses as well as longitudinal and quantitative µCT follow-up of metastatic progression. Altogether, the results obtained by combining bioinformatics and preclinical studies strongly suggest that targeting TSP-1/CD47 axis may represent a valuable therapeutic alternative for hampering melanoma spreading.
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https://hal.univ-reims.fr/hal-02184465
Contributor : Jean-Marc Ferez <>
Submitted on : Tuesday, July 16, 2019 - 9:53:39 AM
Last modification on : Thursday, November 14, 2019 - 1:27:25 AM

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Albin Jeanne, Camille Boulagnon-Rombi, Jérome Devy, Louis Théret, Caroline Fichel, et al.. Matricellular TSP-1 as a target of interest for impeding melanoma spreading: towards a therapeutic use for TAX2 peptide. Clinical and Experimental Metastasis, Springer Verlag, 2017, 33 (7), pp.637-649. ⟨10.1007/s10585-016-9803-0⟩. ⟨hal-02184465⟩

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