1 Thyroid hormone regulates the activity and expression of the peptide transporter PEPT1 in Caco-2 cells KAYOKO ASHIDA, TOSHIYA KATSURA, HIDEYUKI MOTOHASHI, HIDEYUKI SAITO, AND KEN-ICHI INUI Department of Pharmacy, Kyoto University Hospital, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan Running title: REGULATION OF PEPT1 BY THYROID HORMONE IN CACO-2 CELLS Corresponding author: Professor Ken-ichi Inui, Ph.D. Department of Pharmacy, Kyoto University Hospital Sakyo-ku, Kyoto 606-8507, Japan TEL number: +81-75-751-3577 FAX number: +81-75-751-4207 E-mail: Inui@kuhp.kyoto-u.ac.jp C o p y ri g h t 2 0 1 by t h e A m eri c an Ph y si o l o g i c alS o c i et y . A J P-G IA rt i c l es i n PresS . Pu bl i sh ed o n D ecem ber 1 2 ,2 0 1 as D O I1 0 .1 5 2 / aj p g i .0 3 4 .2 0 1