RALEIGH, N.C.--(BUSINESS WIRE)--NephroGenex, Inc. (Nasdaq:NRX), a pharmaceutical company focused on the development of therapeutics to treat kidney disease, today announced the closing of its previously announced underwritten public offering of 1,500,000 shares of common stock, and warrants to purchase an aggregate of 1,500,000 shares of common stock at an exercise price of $6.25 per share. The underwriters also exercised their over-allotment option to purchase warrants to purchase an aggregate