Tuesday, January 29, 2019

As oncolytic viruses pick up steam, dl355 shows promise

Molecular oncologist Fumihiro Higashino and other researchers at Hokkaido University have engineered dl355, a new oncolytic virus which appears to have greater efficacy than the dl1520 oncolytic virus currently used in clinical practice. The virus was engineered from an adenovirus, which was made replication-incompetent by deletion of the E4orf6 gene for ARE-mRNA stabilization. ARE-mRNAs are known to be stable in cancer cells but rapidly degrade in healthy cells without the presence of E4orf6; by deleting E4orf6, the researchers generated a virus that could replicate only in cancer cell environments where ARE-mRNAs were naturally stable.

In work published in Oncology Reports, a dose of 100 viral particles per cell killed nearly all cancer cells within a week (as opposed to very few healthy cells), and the few cancer cell lines that survived were also killed by increasing the dosage. Testing in preclinical mouse models showed that growth of human tumors was suppressed via dl355 administration, and dl355 outperformed the dl1520 oncolytic virus currently used in the clinic. Future studies will focus on validating/building on the safety data and improving the efficacy by enhancing ARE-mRNA stabilization in cancer cells.

Read more at: https://www.sciencedaily.com/releases/2019/01/190129093709.htm

- Arjun Kumar

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