title: Antitumor activity and pharmacokinetics of a mixed-backbone antisense oligonucleotide targeted to the RIalpha subunit of protein kinase A after oral administration.
abstract: Overexpression of the RIalpha subunit of cAMP-dependent protein kinase (PKA) has been demonstrated in various human cancers. PKA has been suggested as a potential target for cancer therapy. The goal of the present study was to evaluate an anti-PKA antisense oligonucleotide (mixed-backbone oligonucleotide) as a therapeutic approach to human cancer treatment. The identified oligonucleotide inhibited the growth of cell lines of human colon cancer (LS174T, DLD-1), leukemia (HL-60), breast cancer (MCF-7, MDA-MB-468), and lung cancer (A549) in a time-, concentration-, and sequence-dependent manner. In a dose-dependent manner, the oligonucleotide displayed in vivo antitumor activity in severe combined immunodeficient and nude mice bearing xenografts of human cancers of the colon (LS174T), breast (MDA-MB-468), and lung (A549). The routes of drug administration were intraperitoneal and oral. Synergistic effects were found when the antisense oligonucleotide was used in combination with the cancer chemotherapeutic agent cisplatin. The pharmacokinetics of the oligonucleotide after oral administration of (35)S-labeled oligonucleotide into tumor-bearing mice indicated an accumulation and retention of the oligonucleotide in tumor tissue. This study further provides a basis for clinical studies of the antisense oligonucleotide targeted to the RIalpha subunit of PKA (GEM 231) as a cancer therapeutic agent used alone or in combination with conventional chemotherapy.
authors.affiliation: Division of Clinical Pharmacology, Department of Pharmacology, Comprehensive Cancer Center, University of Alabama, Birmingham, AL 35294-0019, USA.
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: Q
authors.initials: Q
authors.lastname: Cai
authors.forename: X
authors.initials: X
authors.lastname: Zeng
authors.forename: D
authors.initials: D
authors.lastname: Yu
authors.forename: S
authors.initials: S
authors.lastname: Agrawal
authors.forename: R
authors.initials: R
authors.lastname: Zhang
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000188:drug therapy / Q000473:pathology; D002455:Cell Division / Q000187:drug effects; D002945:Cisplatin / Q000494:pharmacology; D003110:Colonic Neoplasms / Q000188:drug therapy / Q000473:pathology; D054756:Cyclic AMP-Dependent Protein Kinase RIalpha Subunit; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors* / Q000235:genetics; D005260:Female; D018922:HL-60 Cells; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000473:pathology; D051379:Mice; D016513:Mice, SCID; D009368:Neoplasm Transplantation; D016376:Oligonucleotides, Antisense / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D054756:Cyclic AMP-Dependent Protein Kinase RIalpha Subunit; D016376:Oligonucleotides, Antisense; C517834:PRKAR1A protein, human; C517835:Prkar1a protein, mouse; D017868:Cyclic AMP-Dependent Protein Kinases; D002945:Cisplatin