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¹ Fukuda Initiative Research Unit, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
² Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama 350-0295, Japan
³ Laboratory for Behavioral Genetics, Brain Science Institute, and
⁴ Laboratory for Developmental Neurobiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁵ Division of Molecular Neurobiology, Department of Basic Medical Science, the Institute of Medical Science, the University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
⁶ Laboratory of Membrane Trafficking Mechanisms, Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi 980-8578, Japan

Synaptotagmin-like protein (Slp) 2-a is a putative Rab27A/B-effector protein and is implicated in intracellular membrane transport. However, the precise tissue distribution of Slp2-a protein and its functions remain largely unknown. In this study we used a specific anti-Slp2-a antibody to investigate the tissue distribution of Slp2-a in mice and found that Slp2-a is most abundantly expressed in mouse stomach. Co-immunoprecipitation experiments indicated that Slp2-a interacts with Rab27A/B in vivo. We also discovered that Slp2-a and Rab27A/B are predominantly localized at the apical region of gastric-surface mucous cells, where mucus granules are accumulated. Analysis of Slp2-a mutant mice generated by homologous recombination showed a reduced number of mucus granules, a deficiency of granule docking with the apical plasma membrane in the gastric-surface mucous cells and reduction of mucus secretion by Slp2-a-deficient gastric primary cells. Based on these results, we propose that Slp2-a is part of the mucin secretory machinery in surface mucous cells of mouse stomach.

^* Correspondence: E-mail: nori{at}mail.tains.tohoku.ac.jp

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