Control cells were treated for identical times with (middle lane) 20 nM scrambled oligonucleotide. (bottom lane) beta actin antibody blots. 2b. Comparisons of the ratio of RPS2/actin from densitometry scans of the Western blots in fig. 2a. 2c. RT-PCR assays showing the relative level of RPS2 expression in (P) PC-3ML; (L) LNCaP; (IR)

pBABE-IBC-10a-c-myc; and (C) CPTX-1532 cells (at 90% confluent) which were (□) untreated or treated with (╪) scrambled oligonucleotide, and (░) 2 and (■) 4 ug/ml DNAZYM-1P for 8 hr. Shows that the DNAZYM-1P knocks out RPS2 mRNA expression in all 4 cell lines. (×) NPTX-1532 express low levels of RPS2 mRNA (value set at 1). RT-PCR vales selleck products were normalized relative to 18S RNA, and then the fold expression calculated relative to values for untreated NPTX-1532 cells which were set at 1. Results averaged from 3 experiments +/-1 S.D. Immunoflourescent labeling studies with RPS2 antibodies (i.e. P1 antibodies) revealed that RPS2 was over expressed in nuclear and cytoplasmic regions of untreated PC-3ML and CPTX-1532 cells (fig. 3). Figure 3 showed that following exposure of these cells to DNAZYM-1P (4 ug/ml) for 0 and 4 hr, the cells expressed an abundance of RPS2 (fig. 3). However, following extended treatments of 24 hr, the majority of the cells were negative

for RPS2. Control experiments showed that PC-3ML cells exposed to the scrambled DNAZYM oligonucleotide Vadimezan in vitro expressed RPS2 after 0, 4 and 24 hr. In comparison, NPTX-1532 cells which did not express RPS2, were unaffected by DNAZYM-1P for 0, 4 and 24 hr (fig. 3). IBC-10a parent cells also did not express RPS2 or respond to DNAZYM-1P treatment (data not shown). Figure 3 Immunolabeling of PC-3ML, CPTX-1532 and NPTX-1532 cells with RPS2 antibodies following treatment with 4 ug/ml DNAZYM-1P or scrambled oligonucleotide for 0, 4 and 24 hr. Cells were labeled with RPS2 P1 antibody (1:200 dil.) and Alexoflour secondary antibodies counterstained with DAPI. Cells were at ~70% confluence at the time treatment was AZD5582 purchase initiated.

Growth assays measured by the MTS assay [8] further ADAMTS5 showed that 4 and 6 ug/ml DNAZYM-1P blocked growth of 3 different malignant prostate cancer lines which over expressed RPS2, including PC-3ML (P:Z1, P:Z2), CPTX-1532 (C:Z1) and LNCaP (L:Z1) cells. In comparison, the scrambled oligonucleotide (P:scr) and lipofectamine (P:lip) alone did not block growth of PC-3ML cells. DNAZYM-1P treatment of NPTX-1532 (N:Z2) cells did not block cell proliferation (fig. 4a). Apoptosis Assays using Annexin V antibody labeling and flow cytometry showed that 4 & 6 ug/ml DNAZYM-1P induced increased amounts of apoptosis in PC-3ML cells after 8–24 hr (i.e. 5% to 28%) (fig. 4b, ■, ◆), but failed to induce significant amounts of apoptosis in NPTX-1532 cells after 0, 8, 24, 48 and 72 hr treatment (i.e. < 1.2%)(fig. 4c, ■, ◆).