Moreover, Wang et al showed

that in vivo transfer of PEDF

Moreover, Wang et al showed

that in vivo transfer of PEDF mediated by adenoviral vectors exerted a dramatic inhibition of find protocol tumor growth in athymic nude mice implanted with the human HCC and in C57BL/6 mice implanted with mouse lung carcinoma [26]. In the present study, we investigated the adenovirus-mediated PEDF gene transfer and tested its anti-tumor effect in a mouse model of melanoma. Melanoma, a tumor derived from neuroectoderm, has a high malignancy with poor prognosis, due to the vascular and lymphatic metastasis during the late stage [27]. The outcomes of existing therapeutic protocols are very poor. Thus, the development of novel treatment approaches is required [28]. Since the neovascularization is one critical underlying selleck chemicals mechanism of vascular and lymphatic metastasis, the current study was designed to investigate whether

overexpression of PEDF mediated by adenovirus gene transfer is a potential approach to suppress tumor angiogenesis and inhibit melanoma growth. Encouragingly, we constructed a recombinant PEDF adenovirus that is capable of transferring PEDF gene producing secretory PEDF protein both in vitro and in vivo. Furthermore, we showed that the secretory PEDF is a functional protein with potent inhibitory effects on HUVEC proliferation. More importantly, tumor-bearing mice exhibited significantly reduced tumor volume and prolonged survival time after Ad-PEDF treatment. Finally, we demonstrated that Ad-PEDF exerted anti-tumor activity through inhibiting angiogenesis, reducing MVD and increasing apoptosis. Adenovirus type 5 is an established and widely used vector for the delivery of therapeutic genes [29]. Although there is no evidence to prove Ad-PEDF has a stronger therapeutic effect on tumors than other PEDF patterns, the adenovirus vector has several properties that make it particularly promising for gene therapy. First, the adenovirus vector can efficiently transfer genes to both dividing and quiescent cells both in vivo and in vitro, and importantly

possesses high stability in vivo. Additionally, adenovirus vector Carbachol can be produced at high titer conveniently, which is essential for clinical utility. Finally, as opposed to the retrovirus vector such as lentivirus, adenoviral DNA does not usually integrate into host cell’s genome and therefore has a very low risk of generating tumorigenic mutations. Adenovirus-related pathology is mostly limited to mild upper respiratory tract infections [30, 31]. It is very encouraging that Ad-PEDF treatment resulted in a high level of PEDF expression in serum and caused the inhibition of tumor growth. However, a few questions were left unaddressed in this study. First, this study mainly focused on the primary tumor, it is unknown whether Ad-PEDF treatment is effective in controlling late stage tumor growth, metastasis, and tumor growth in a metastasis site.

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