ROCKVILLE, Md., Dec. 27, 2011 /PRNewswire/ -- Neuralstem, Inc. (NYSE Amex: CUR) announced that it has been approved by the Food and Drug Administration to advance to Phase Ib in its ongoing clinical trial to test its novel neuroregenerative compound,NSI-189, for the treatment of major depressive disorder (MDD). Phase Ib will test the safety and tolerability of the drug in depressed patients. NSI-189 is a proprietary new chemical entity discovered by Neuralstem that stimulates new neuron growth in the hippocampus, an area of the brain that is believed to be involved in MDD as well as other diseases and conditions, such as Alzheimer's disease and post-traumatic stress disorder (PTSD).