9:15 AM. 353. A Long-acting Injectable Nanoparticle System for Sustained Anti-TNF-α Antibody Therapy for Treatment of Ulcerative Colitis.Yicheng Zhang, PhD1, Ling Li, MD PhD2, Jiayuan Kong, PhD1, Yuanmuhuang Long, BS1, Sachin Kammula, BS1, Xiaoya Lu, MS1, Florin Selaru, MD MBA2, Hai-Quan Mao, PhD1 1Johns Hopkins University, 2Johns Hopkins University School of Medicine