Exosome inhibition improves response to first-line therapy in small cell lung cancer.

Autor: Irep N; Department of Cancer Molecular Biology, Institution of Health Sciences, Pamukkale University, Denizli, Turkey., Inci K; Department of Cancer Molecular Biology, Institution of Health Sciences, Pamukkale University, Denizli, Turkey., Tokgun PE; Department of Medical Genetics, Faculty of Medicine, Pamukkale University, Denizli, Turkey., Tokgun O; Department of Cancer Molecular Biology, Institution of Health Sciences, Pamukkale University, Denizli, Turkey.; Department of Medical Genetics, Faculty of Medicine, Pamukkale University, Denizli, Turkey.
Jazyk: angličtina
Zdroj: Journal of cellular and molecular medicine [J Cell Mol Med] 2024 Feb; Vol. 28 (4), pp. e18138.
DOI: 10.1111/jcmm.18138
Abstrakt: Exosomes are recognized as important mediators of cell-to-cell communication, facilitating carcinogenesis. Although there have been significant advancements in exosome research in recent decades, no drugs that target the inhibition of sEV secretion have been approved for human use. For this study, we employed GW4869 and Nexinhib20 as inhibitors of exosome synthesis and trafficking combined. First, we found that Nexinhib20 and GW4869 effectively inhibited RAB27A and neutral sphingomyelinase 2 (nSMase2) nsMase2. Interestingly, the inhibition of nsMase2 and RAB27A decreased expression of CD9, CD63 and Tsg101, both at RNA and protein levels. We used a combination treatment strategy of cisplatin/etoposide plus GW4869 or Nexinhib20 on small cell lung cancer (SCLC) cell lines. The combination treatment of GW4869 or Nexinhib20 effectively enhanced the inhibitory effects of first-line chemotherapy on the SCLC cells. Furthermore, we demonstrated that reducing exosome release through GW4869 and Nexinhib20 treatment effectively reduced cellular proliferation and significantly induced apoptosis in SCLC cells. Also, we showed that combining exosome inhibition with chemotherapy has a significant synergistic effect on cellular proliferation. We also found increased p53 and p21 expressions with western blot and significantly changing Bax, BCL2, caspase-3 and caspase-9 expressions. Inhibiting the exosome pathway offers opportunities for developing novel, effective treatment strategies for SCLC.
(© 2024 The Authors. Journal of Cellular and Molecular Medicine published by Foundation for Cellular and Molecular Medicine and John Wiley & Sons Ltd.)
Databáze: MEDLINE
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