San Diego-based biopharmaceuticals developer Lumena Pharmaceuticals has been acquired by UK-based Shire plc, in a deal worth $260M plus earn out, the companies said this morning. Shire said the buy would help add to its rare diseases portfolio. Lumena Pharmaceuticals had filed for an IPO in April; the company was venture backed by Alta Partners, New Enterprise Associates, RiverVest, A.M. Pappas Life Sciences Ventures, and Adage Capital Partners.