Abstract
The tyrosine kinase Janus kinase 3 (JAK3) contributes to signaling regulating the proliferation and apoptosis of lymphocytes and tumor cells. Replacement of lysine by alanine in the catalytic subunit yields the inactive K851AJAK3 mutant that underlies severe combined immune deficiency. The gain-of-function mutation A572VJAK3 is found in acute megakaryoplastic leukemia and T cell lymphoma. The excessive nutrient demand of tumor cells requires upregulation of transporters in the cell membrane including peptide transporters PEPT1 and PEPT2. The carriers further accomplish intestinal peptide transport. Little is known about signaling regulating peptide transport. The present study explored whether PEPT1 and PEPT2 are upregulated by JAK3. PEPT1 or PEPT2 was expressed in Xenopus oocytes with or without additional expression of JAK3, and electrogenic peptide (glycine–glycine) transport was determined by dual-electrode voltage clamp. PEPT2-HA membrane protein abundance was analyzed by chemiluminescence. Intestinal electrogenic peptide transport was estimated from peptide-induced current in Ussing chamber experiments. In PEPT1- and PEPT2-expressing oocytes, but not in water-injected oocytes, the dipeptide gly–gly generated an inward current, which was significantly increased following coexpression of JAK3. The effect of JAK3 on PEPT1 was mimicked by A568VJAK3 but not by K851AJAK3. JAK3 increased maximal peptide-induced current in PEPT1-expressing oocytes but rather decreased apparent affinity of the carrier. Coexpression of JAK3 enhanced the PEPT2-HA protein abundance in the cell membrane. In JAK3- and PEPT1-expressing oocytes, peptide-induced current was blunted by the JAK3 inhibitor WHI-P154, 4-[(3′-bromo-4′-hydroxyphenyl)amino]-6,7-dimethoxyquinazoline (22 μM). In intestinal segments gly–gly generated a current which was significantly smaller in JAK3-deficient mice (jak3 −/−) than in wild-type mice (jak3 +/+). In conclusion, JAK3 is a powerful regulator of peptide transporters PEPT1 and PEPT2.
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The authors acknowledge the meticulous preparation of the manuscript by Ali Soleimanpour and Lejla Subasic and technical support by Elfriede Faber. This study was supported by the Deutsche Forschungsgemeinschaft (GRK 1302, SFB 773 B4/A1, La 315/13-3).
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Warsi, J., Hosseinzadeh, Z., Dong, L. et al. Effect of Janus Kinase 3 on the Peptide Transporters PEPT1 and PEPT2. J Membrane Biol 246, 885–892 (2013). https://doi.org/10.1007/s00232-013-9582-3
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DOI: https://doi.org/10.1007/s00232-013-9582-3