News out
Elan and Transition Therapeutics Announce Phase 1 Data Showing ELND005 Achieves Desired Concentrations in Brain Tissue and Cerebrospinal Fluid
Presentations at 2009 Alzheimer's Association International Conference on
Alzheimer's Disease Support Ongoing Phase 2 Trial
DUBLIN, Ireland, TORONTO, ON, and VIENNA, Austria, July 13 /CNW/ - Elan Corporation, plc (NYSE: ELN) and Transition Therapeutics Inc. (TSX: TTH, NASDAQ: TTHI) today presented Phase 1 data demonstrating that treatment with ELND005 (scyllo-inositol formerly known as AZD-103), achieves desired concentrations in human brain tissue and cerebrospinal fluid when given orally. Preclinical data also were presented showing that ELND005 administration is associated with preservation of choline acetyltransferase (ChAT), reflecting preservation of nerve cells that are critical to memory function in the brain. ELND005 is an orally-administered drug candidate in Phase 2 trials for the treatment of mild to moderate Alzheimer's disease. These results were presented at the 2009 Alzheimer's Association International Conference on Alzheimer's Disease (ICAD 2009) in Vienna, Austria.
In a poster entitled, "Oral Amyloid Anti-aggregating Agent ELND005 is Measurable in CSF and Brain of Healthy Adult Men," the researchers describe results of a Phase 1 study in which eight healthy adults each received 2,000 mg of ELND005 twice a day for 10 days. Concentrations of ELND005 in cerebrospinal fluid were measured directly, while brain tissue concentrations were measured non-invasively using a novel magnetic resonance spectroscopy technique and were determined to be within the range associated with efficacy in previous animal studies that employed a transgenic animal model of Alzheimer's Disease. ELND005 was well tolerated by these study participants with no severe, serious, or treatment-limiting adverse events observed.
"Achieving a clinically beneficial concentration of drug in brain tissue and cerebrospinal fluid has presented a significant hurdle to other drugs investigated to treat Alzheimer's Disease, so this is an important proof of concept for us," said Elan president Carlos V. Paya, MD, PhD. "We look forward to completing and reporting results from our ongoing Phase 2 study of ELND005 in patients with mild to moderate Alzheimer's disease, which completed enrollment in October 2008."
In a second poster, entitled "Quantification of Cholinergic Degradation and Adult Neurogenesis in TgCRND8 Mice Following Treatment with Scyllo-Inositol (ELND005)," Dr. JoAnne McLaurin and colleagues from the University of Toronto analyzed levels of the enzyme Choline Acetyltransferase (ChAT) in an animal model of Alzheimer's disease. As in humans, these Alzheimer's animal models exhibit damage to nerve cells in a region of the brain called the "basal forebrain" that use the neurotransmitter acetylcholine to transmit nerve impulses critical to memory functions to other nerve cells in a brain region important for memory function called the hippocampus. Animals treated with ELND005 exhibited significantly more ChAT levels compared to untreated animals.
"There is evidence that amyloid plaque formation drives the decline in memory and cognition associated with Alzheimer's disease," said JoAnne McLaurin, PhD, professor at the University of Toronto's Centre for Research in Neurodegenerative Diseases. "Although more research is necessary, the findings presented today suggest that ELND005 may have the ability to prevent the loss of ChAT that results from damage to cholinergic neurons in the brain, thereby potentially protecting against cognitive decline in individuals with Alzheimer's disease."
"We have conducted a robust preclinical and Phase 1 research program of ELND005 that has demonstrated that the drug is able to cross the blood-brain barrier, which should allow it to target the disaggregation of amyloid beta in the brain," said Dr. Tony Cruz, chairman and chief executive officer of Transition.
In 2006, Elan and Transition entered into an exclusive, worldwide collaboration agreement for the joint development and commercialization of ELND005 for the treatment of Alzheimer's disease and other indications.