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MDRNA Successfully Silences Gene Targets in Animal Models Using Novel UsiRNA Constructs
Proprietary DiLA2 Platform Achieves In Vivo Knockdown of Multiple Metabolic Targets and Demonstrates Safe and Effective Delivery in Repeat Dose Studies
| Source: MDRNA, Inc.
BOTHELL, WA--(Marketwire - February 23, 2009) - MDRNA, Inc. (NASDAQ : MRNA ) announced today
positive in vivo efficacy data on its proprietary UsiRNA constructs
demonstrating a dose response which resulted in up to 90% knockdown of ApoB
message in a rodent model. The data were presented by Michael V. Templin,
Ph.D., Vice President, Discovery Research and Pharmaceutical Development of
MDRNA, at the inaugural Informa Life Sciences TIDES Oligonucleotide and
Peptide® Research, Technology and Product Development Conference in
Tokyo, Japan.
"Our UsiRNA constructs offer a novel and proprietary means of providing
highly potent siRNAs while increasing specificity," stated Barry Polisky,
Ph.D., Chief Scientific Officer of MDRNA. "UsiRNAs were highly active in
the mouse ApoB model for both message inhibition and serum cholesterol
reduction. In these cases, UsiRNAs were fully compatible with RNAi
machinery yet showed a substantial decrease in cytokine response. We are
encouraged by these significant results and believe we have a unique siRNA
construct to silence genes while minimizing potential side effects."
UsiRNAs are duplex siRNAs that are modified with non-nucleotide acyclic
monomers, termed unlocked nucleobase analogs (UNA), in which the bond
between two adjacent carbon atoms of ribose is removed. UsiRNAs are fully
recognized by the RNAi machinery and provide for potent RNAi activity.
Placement of UNA within UsiRNA minimizes the potential for off-target
effects by the guide strand as well as undesired activity of the passenger
strand. Further, the change in sugar structure renders this unlocked
nucleobase analog conformationally flexible. The flexibility of the monomer
escapes the surveillance mechanisms associated with cytokine induction, as
well as providing protection from nuclease degradation.
MDRNA also reported new information on its DiLA2 Platform delivery
technology:
"We are pleased to announce that our proprietary DiLA2 Platform achieved
knockdown of two additional genes in liver tissue, DGAT2 and PCSK9, that
are potentially important therapeutic targets, and the Platform continues
to demonstrate safe and effective delivery following repeat systemic dosing
of up to 9 mg/kg of siRNA formulations in mice," added Dr. Polisky. "The
acute and repeat dose tolerability data of the DiLA2 Platform are
promising. Repeat dosing on an every-third-day schedule for two weeks
further indicates that DiLA2 liposomes are well tolerated.
Our ability to deliver siRNAs to hepatocytes while achieving knockdown of
multiple gene targets affirms our belief that the DiLA2 Platform represents
a significant advancement in the development of a novel formulation for
improved siRNA delivery."
"Our proprietary and novel UsiRNA constructs -- highly active siRNAs which
minimize off-target activity -- represent a potential major step forward in
the development of RNAi-based therapeutics," stated J. Michael French,
President and Chief Executive Officer of MDRNA. "Further, our DiLA2
Platform continues to demonstrate its versatility in its ability to safely
and efficiently deliver siRNAs against multiple gene targets and
effectively silence those genes. The results reported today represent a
further demonstration of the breadth and depth of our RNAi-based drug
discovery engine and the capability and expertise of our scientific team."
About the DiLA2 Platform
The DiLA2 Platform is MDRNA's proprietary platform for creating novel
liposomal delivery systems from amino acids. The platform enables MDRNA to
tailor the charge, linker and acyl chains of amino acids in order to
optimize the liposome for delivery to the target tissue of interest. In
addition, the platform is designed to permit attachment of various peptides
and other targeting molecules to improve a variety of delivery
characteristics. In addition, MDRNA is utilizing peptides for nanoparticle
formulations to increase cellular uptake and endosomal release.
About MDRNA, Inc.
MDRNA is a biotechnology company focused on the development and
commercialization of therapeutic products based on RNA interference (RNAi).
Our goal is to improve human health by combining novel RNAi-based compounds
and proprietary peptide- and liposomal-based drug delivery technologies to
provide superior therapeutic options. Our multi-disciplinary portfolio of
capabilities includes molecular biology, cellular biology, formulation
expertise, peptide and alkylated amino acid chemistry, pharmacology,
toxicology and bioinformatics. We are applying this expertise to a single,
integrated drug discovery platform that will be the engine for our clinical
pipeline and a versatile platform for establishing broad therapeutic
partnerships. We are also building on new technologies, such as UsiRNAs
that incorporate the non-nucleotide moiety Unlocked Nucleobase Analog (UNA)
within the siRNA molecule, that we expect to lead to safer and more
effective RNAi-based therapeutics. By combining broad expertise in siRNA
science with proven delivery platforms and a strong and growing IP
position, MDRNA is well positioned as a leading RNAi therapeutics company
and value-added collaborator for our research partners. Additional
information about MDRNA, Inc. is available at http://www.mdrnainc.com.
MDRNA Forward-Looking Statement
Statements made in this news release may be forward-looking statements
within the meaning of Federal Securities laws that are subject to certain
risks and uncertainties and involve factors that may cause actual results
to differ materially from those projected or suggested. Factors that could
cause actual results to differ materially from those in forward-looking
statements include, but are not limited to: (i) the ability of MDRNA or a
subsidiary to obtain additional funding; (ii) the ability of MDRNA or a
subsidiary to attract and/or maintain manufacturing, research, development
and commercialization partners; (iii) the ability of MDRNA, a subsidiary
and/or a partner to successfully complete product research and development,
including preclinical and clinical studies and commercialization; (iv) the
ability of MDRNA, a subsidiary and/or a partner to obtain required
governmental approvals; and (v) the ability of MDRNA, a subsidiary and/or a
partner to develop and commercialize products that can compete favorably
with those of competitors. Additional factors that could cause actual
results to differ materially from those projected or suggested in any
forward-looking statements are contained in MDRNA's most recent periodic
reports on Form 10-K and Form 10-Q that are filed with the Securities and
Exchange Commission. MDRNA assumes no obligation to update and supplement
forward-looking statements because of subsequent events.