Anavex Advances Drug Candidate for Treatment of Alzheimer's Disease
GENEVA, November 28, 2007 /PRNewswire-FirstCall/ - Anavex Life Sciences Corp. ("ANAVEX") is pleased to announce promising developments with ANAVEX 1-41, the company's lead drug candidate for Alzheimer's disease. In recent pre-clinical animal studies, ANAVEX 1-41 prevented oxidative stress, which damages and destroys cells and is believed to be a primary cause of Alzheimer's disease. ANAVEX 1-41 also prevented the expression of caspase-3, an enzyme that plays a key role in programmed cell death and in the loss of cells in the hippocampus, the part of the brain that regulates learning, emotion and memory.
The results are further highlighted in that this activity involves both muscarinic and sigma-1 receptor systems indicating a novel mechanism of action. Published results were presented at the Neuroscience 2007 conference in San Diego, California, and are available at http://www.anavex.com/publications.html. Testing on ANAVEX 1-41 is being conducted in cooperation with Universite Montpellier in France.
"The fact that we have evidence of neuroprotective action, which is essentially protection to any part of the body's nervous system, through the prevention of oxidative stress is a major milestone in the development of ANAVEX 1-41," said Dr. Vamvakides, Chief Scientific Officer of ANAVEX. "With this novel mechanism of action we anticipate that ANAVEX 1-41 may slow the progression of Alzheimer's disease and considerably improve the quality of life of those impacted by the disease as well as their caregivers."
The pre-clinical studies tested ANAVEX 1-41's ability to protect neurons, the nerve cells that make up the central nervous system, from degeneration or death. Testing was conducted in a non-transgenic mouse model of Alzheimer's disease. The brains of mice were injected with amyloid beta peptide, the key ingredient in Alzheimer's brain plaques, which is known to induce histological and biochemical changes, oxidative stress and learning deficits within seven days.
When ANAVEX 1-41 was administered to mice during pre-clinical testing, the compound dose prevented amyloid-beta-induced learning in the spontaneous alternation and passive avoidance performances. In addition, it blocked the induction of amyloid-beta-induced lipid peroxidation, the biochemical process that mediates damage to nerve cell membranes. ANAVEX 1-41 also reduced the loss of pyramidal cells in the hippocampus and blocked the amyloid-beta-induced expression of caspase-3.
ANAVEX 1-41 has been previously shown to reverse learning deficits in mice that were induced by the drugs scopolamine and dizocilpine, or through the administration of amyloid beta peptide. In addition to these findings, the ANAVEX scientific team recently reported the neuroprotective potential of sigma-1 receptor drugs due to their sigma-1 receptor modulatory role on calcium mobilization and signal transduction pathways.
"We are excited by the data that was presented at the Neuroscience 2007 conference regarding the neuroprotective and anti-amnesic properties of ANAVEX 1-41 for Alzheimer's disease," said Dr. Kontzalis, Chief Executive Officer for ANAVEX. "We are committed to further exploring the disease-modifying properties of ANAVEX 1-41 and to meeting our ultimate goal of developing novel therapies to prevent the onset of or slow the progression of Alzheimer's disease."
ANAVEX 1-41 pre-clinical studies will be completed in the coming weeks. Once pre-clinical testing is complete, ANAVEX will commence with IND filing so that human trials of ANAVEX 1-41 can begin.
About Alzheimer's disease
Alzheimer's disease is the most common cause of dementia and is characterized by the progressive degeneration of cognition as a result of the destruction of nerve cells in the brain. Dementia affects an estimated 37 million people worldwide and approximately 50% of these cases are caused by Alzheimer's disease. In March 2007, the Alzheimer's Association reported that 5.1 million people in the United States (4.9 million of whom are aged 65 and older) are living with Alzheimer's disease. This represents an increase of at least 10% from the previous prevalence estimate of 4.5 million. By 2015, there could be as many as 16.8 million people with Alzheimer's disease in the major seven pharmaceutical markets unless novel drug treatment therapies are discovered.
Medications currently available to treat Alzheimer's disease include acetylcholinesterase inhibitors and N-methyl-D aspartate receptor antagonists. Both types of medications only treat symptoms of the disease - they do not stop the onset and progression of Alzheimer's disease.
In conclusion, there are very real and unmet medical requirements for drug therapies to treat Alzheimer's disease. The impressive market size leaves no doubt for the business opportunity presented by treatments for Alzheimer's disease.
Drugs able to act on the underlying disease pathology and modify disease onset and progression, demonstrating neuroprotective, anti-amnesic and preventive properties combined with excellent safety and low toxicity, have the potential for blockbuster sales.
About Sigma Receptors
Sigma receptors are a unique family of proteins, present mainly in the Central Nervous System (CNS) but also in various peripheral tissues. The receptors are classified in two subtypes: the sigma-1 and sigma-2. These subtypes are distinguishable pharmacologically, functionally and by molecular size. Sigma-1 receptors have been cloned and shown to be distinct from any known receptor class.
In the CNS, they are involved in the modulation of neurotransmitter receptor function, neurotransmitter release and response, as well as memory and learning processes, demonstrating potential neuroprotective and anti-amnesic properties. The modulatory action and the implication of numerous cellular and biochemical signaling pathways suggest possible sigma receptor involvement in many neuronal processes, as well as in the pathophysiology of certain psychiatric disorders including depression, schizophrenia, motor disturbances, neuropathic pain, drug addiction, and attention deficit disorders.
Anavex Life Sciences Corp. (www.anavex.com) is an emerging biopharmaceutical company engaged in the discovery and development of novel drug targets for the treatment of cancer and neurological diseases. The company's proprietary SIGMACEPTOR(TM) Discovery Platform involves the rational drug design of compounds that fulfill specific criteria, based on unmet market needs and new scientific advances. Selected drug candidates demonstrate high, non-exclusive affinity for sigma receptors, which are involved in the modulation of multiple cellular biochemical signaling pathways.
ANAVEX's SIGMACEPTOR(TM)-N program involves the development of novel and original drug candidates, targeting neurological and neurodegenerative diseases (Alzheimer's disease, epilepsy, depression, etc.). The company's lead drug candidates exhibit high, non-exclusive affinity for sigma receptors with strong evidence for anti-amnesic, neuroprotective, anti-apoptotic, anti-oxidatitive, anti-inflammatory, anti-convulsive, anti-depressant, and anxiolytic properties.
ANAVEX's SIGMACEPTOR(TM)-C program involves the development of novel and original drug candidates targeting cancer. The company's lead drug candidates exhibit high, non-exclusive affinity for sigma receptors with strong evidence for selective pro-apoptotic, anti-metastatic and low toxicity properties in various types of solid cancers such as cancer of the colon, prostate, breast, lung, etc.
This press release contains forward-looking statements for Anavex Life Sciences Corp. that involves a number of risks and uncertainties. Actual events or results may differ materially from those projected in any of such statements due to various factors. Among other things, there can be no assurance that any of the Company's development efforts relating to its product candidate, ANAVEX 1-41, will be successful, or such product candidate will be successfully commercialized or that ANAVEX 1-41 will have the potential to treat Alzheimer's disease or other types of neurodegenerative diseases or that ANAVEX 1-41 will provide clinically relevant advantages over other competitive compounds in development. Other risks that affect forward-looking information contained in this press release include the high degree of risk associated with drug development, results of further research and development, the impact of competition and of technological advances and other risks detailed to ANAVEX's SEC filings. Other than as required by federal securities laws, we undertake no obligation to publicly update or revise any of our forward-looking statements, whether as a result of changed circumstances, new information, future events, or for any other reason occurring after the date of this news release.
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Posted: November 2007