CK2 targeted RNAi therapeutic delivered via malignant cell-directed tenfibgen nanocapsule: dose and molecular mechanisms of response in xenograft prostate tumors.

Abstract	CK2, a protein serine/threonine kinase, promotes cell proliferation and suppresses cell death. This essential-for-survival signal demonstrates elevated expression and activity in all cancers examined, and is considered an attractive target for cancer therapy. Here, we present data on the efficacy of a tenfibgen (TBG) coated nanocapsule which delivers its cargo of siRNA (siCK2) or single stranded RNA/DNA oligomers (RNAi-CK2) simultaneously targeting CK2α and α' catalytic subunits. Intravenous administration of TBG-siCK2 or TBG-RNAi-CK2 resulted in significant xenograft tumor reduction at low doses in PC3-LN4 and 22Rv1 models of prostate cancer. Malignant cell uptake and specificity in vivo was verified by FACS analysis and immunofluorescent detection of nanocapsules and PCR detection of released oligomers. Dose response was concordant with CK2αα' RNA transcript levels and the tumors demonstrated changes in CK2 protein and in markers of proliferation and cell death. Therapeutic response corresponded to expression levels for argonaute and GW proteins, which function in oligomer processing and translational repression. No toxicity was detected in non-tumor tissues or by serum chemistry. Tumor specific delivery of anti-CK2 RNAi via the TBG nanoencapsulation technology warrants further consideration of translational potential.
Authors	Khalil Ahmed, Betsy T Kren, Md Joynal Abedin, Rachel I Vogel, Daniel P Shaughnessy, Lucas Nacusi, Vicci L Korman, Yingming Li, Scott M Dehm, Cheryl L Zimmerman, Gloria A Niehans, Gretchen M Unger, Janeen H Trembley
Journal	Oncotarget (Oncotarget) Vol. 7 Issue 38 Pg. 61789-61805 (Sep 20 2016) ISSN: 1949-2553 [Electronic] United States
PMID	27557516 (Publication Type: Journal Article)
Chemical References	Nanocapsules Peptide Fragments Tenascin tenfibgen
Topics	Animals Cell Death Cell Line, Tumor Cell Proliferation Drug Delivery Systems Humans Male Mice Mice, Inbred NOD Mice, Nude Mice, SCID Nanocapsules (chemistry) Peptide Fragments (chemistry) Prostatic Neoplasms (drug therapy) RNA Interference RNAi Therapeutics Signal Transduction Tenascin (chemistry) Xenograft Model Antitumor Assays

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