Executive Summary - RNAi / PSR

Summary: NexGen’s RNAi / PSR (protein synthesis restriction) platform technology offers a novel therapeutic approach in several disease conditions, with addressable markets approaching $ 20 billion in the US. The technology is covered by 5 issued and 1 pending US patents. The therapeutic effect of RNAi / PSR is targeted Antiproliferative, Anti-Inflammatory, and Antiviral activity, with a large margin of systemic safety.

Clinical Data Summary: The data is consistent with the known MOA of binding to ribosomes and interfering with translation of RNA into proteins. The Antiproliferative activity of RNAi / PSR was characterized in 7 Phase II human clinical trials against cancer. The drug is a cytostatic requiring prolonged administration for cytotoxic effect. The Antiviral activity was characterized ex vivo in human cell lines infected with herpes virus. The drug inhibited de novo synthesis of all viral proteins as well as inhibited viral DNA synthesis as a secondary effect of protein synthesis inhibition (viral DNA polymerase). The Anti-inflammatory activity was demonstrated in vivo, in contact hypersensitive mice. A 30 ng topical dose resulted in a 44% reduction in inflammation. The dermal PK was characterized in 2 studies, ex vivo, human skin. The compounds tested localized virtually completely in the epidermis and dermis ( 97% - 99%). Systemic safety was characterized in 4 Phase I human clinical trials by intravenous infusion. The IC100 doses proposed for targeted dermal, pulmonary, and transdermal indications range from hundreds of times to hundreds of thousands of times smaller than the human systemic NOEL dose (no observable effect level dose).

Target Markets: Markets where RNAi / PSR’s potency and targeted treatment would be advantageous include:

The Competition: In context of RNAi technologies, RNAi / PSR is better suited for disease conditions involving synthesis of a broad spectrum of proteins, whereas other RNAi technologies focus on a single protein. A brief background is necessary to understand the difference as well as to understand our IP strategy.

RNA function is summarized below. Drugs that interfere with or inhibit RNA interfere with or inhibit protein synthesis.

Synthesis of a single aberrant protein or overexpression of single normal protein results in certain disease conditions. Disease conditions can also involve hyperactive synthesis of a broad spectrum of proteins, such as happens with cell hyperproliferation, inflammation, and viral infections.

siRNA: siRNA uses Antisense technology to target a specific mRNA sequence and hence inhibit synthesis of a single protein. siRNA requires stabilization and delivery technologies, which are a major impediment to its commercialization.

RNAi / PSR: RNAi / PSR is better suited for disease conditions that involve synthesis of a large spectrum of proteins and does not require any stabilization or delivery technology. Drug concentration defines degree of PSR (e.g. IC50, IC 80, IC100). Side chain combinations define intracellular inactivation time, hence biological efficacy period, which can be from hours to days. .

Patent Summary: The availability of 5 side chain sites makes innumerable synthetic variants possible, making composition of matter patents fairly meaningless from a protection standpoint. The treatment method patents are intended to provide, in advance, dual protection for any new composition of matter developed by the method patent holder, as well as provide protection against the medicinal use any synthetic variants made by a competitor for the following indications:

U.S. Pat. 6,346,251 - Psoriasis Treatment Method
U.S. Pat. 6,355,251 - Epidermal Exfoliation Method ( Age Spots, Warts, skin rejuvenation, etc...)
U.S. Pat. 6,559,178 - Apoptotic Chemosurgery Method (Ablation of Non Malignant Cell Populations)
U.S. Pat. 7,012,091 - Pulmonary Anti-Inflammatory
U.S. Pat. 7,015,244 - COPD Treatment Method
US App. 12/321,717 - Dermal and Pulmonary Anti-Infective, Anti-Inflammatory (Herpes, Acne, Avian Flu)

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DISCLAIMER AND IMPORTANT NOTICE: The Compositions and Methods presented on this website are all in preclinical stages. They are based only on our understanding of the proposed underlying mechanisms of action and on any available coincidental corroborative empirical evidence, any of which may in fact turn out not to be correct, or may be prevented from functioning as envisioned because of other factors or mechanisms of action not contemplated or considered, or may even cause harm because of factors or mechanisms of action not anticipated. The process of obtaining FDA approvals has not been started in any of the areas disclosed on this website. The disclosures here are purely for scientific information exchange purposes, representing one scientific point of view, and are not intended to suggest, or be used for, any proposed medical treatments.

© 2010 Mark Zamoyski & NexGen Biomedical, Inc.