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  • Title: Inhibition of murine K-BALB and CT26 tumour growth using a Semliki Forest virus vector with enhanced expression of IL-18.
    Author: Chikkanna-Gowda CP, McNally S, Sheahan BJ, Fleeton MN, Atkins GJ.
    Journal: Oncol Rep; 2006 Oct; 16(4):713-9. PubMed ID: 16969484.
    Abstract:
    The enhanced Semliki Forest virus vector (SFV10-E), an RNA-based suicide expression vector system, expresses foreign genes at levels up to 10x higher than the original SFV10 vector. This vector has been used previously to express interleukin-12 for a tumour treatment study in a BALB/c murine model. Interleukin-18, an IFN-gamma-inducing cytokine, plays a key role in the early induction of T helper1 (Th1) cell-mediated immune responses in addition to anti-angiogenic activity. In this study, the murine IL-18 gene along with an Ig-kappa leader sequence was cloned into the SFV10-E vector. The pSFV10-E-IL-18 construct was characterised in vitro for levels of expression and secretion, and the production of biologically active IL-18 was confirmed. An in vivo tumour treatment study using high titre rSFV10-E-IL-18 virus-like particles to treat subcutaneous K-BALB and CT26 tumours in BALB/c mice demonstrated therapeutic efficacy including the disappearance of tumour cells in a minority of treated animals. Tumour regression was associated with induction of avascular and suppurative necrosis.
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