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J. Biol. Chem., Vol. 278, Issue 38, 36470-36475, September 19, 2003

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Role of ADP-ribosylation Factor 6 (ARF6) in Gastric Acid Secretion^*

Jun Matsukawa , Kazuhisa Nakayama , Taku Nagao ¶, Hidenori Ichijo  and Tetsuro Urushidani  ¶ ||

From the Laboratory of Cell Signaling, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, the Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto 606-8501, and the ^¶National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan

ADP-ribosylation factor (ARF) proteins are monomeric GTPases that are essential for membrane transport and exocytosis in a number of secretory cells. We investigated ARF6, the activation of which is insensitive to brefeldin A, to determine whether it regulates membrane traffic in gastric parietal cells. ARF6 translocated from cytosol to tubulovesicle in the presence of GTPS, a potential inhibitor of acid secretion in permeabilized cells, whereas under the Mg²⁺-chelated condition where activity of ARF-GTPase activating protein is inhibited, ARF6 translocated to the apical secretory membrane. Immunohistochemical examination revealed that ARF6 mainly located in parietal cell within the gastric glands, and it translocated from the cytosol to the intracellular canaliculi when the glands were stimulated. These results indicated that the distribution of ARF6 between cytosol and the two different membranes was regulated by its GTPase activity. In cultured gastric glands infected with adenovirus expressing ARF6 Q67L, a mutant lacking GTP hydrolysis activity, gastric acid secretion was inhibited. These results suggest that ARF6 regulates gastric acid secretion in parietal cell and that the GTP hydrolysis cycle of ARF6 is essential for the activation pathway.

Received for publication, May 23, 2003 , and in revised form, July 10, 2003.

^* This study was supported in part by the Japanese Ministry of Education, Science, Sports and Culture Grants 13470511 and 13557220. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

^|| To whom correspondence should be addressed. Tel.: 81-3-3700-1986; Fax: 81-3-3700-9647; E-mail: urusidani{at}nihs.go.jp.

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