Achlorhydria by ezrin knockdown: defects in the formation/expansion of apical canaliculi in gastric parietal cells.
Achlorhydria by ezrin knockdown: defects in the formation/expansion of apical canaliculi in gastric parietal cells.
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DOI:
10.1083/jcb.200410083
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发表时间:
2005-04-11
期刊:
影响因子:
--
通讯作者:
Tsukita S
中科院分区:
文献类型:
--
作者:
Tamura A;Kikuchi S;Hata M;Katsuno T;Matsui T;Hayashi H;Suzuki Y;Noda T;Tsukita S;Tsukita S
Loss of gastric acid secretion is pathologically known as achlorhydria. Acid-secreting parietal cells are characterized by abundant expression of ezrin (Vil2), one of ezrin/radixin/moesin proteins, which generally cross-link actin filaments with plasma membrane proteins. Here, we show the direct in vivo involvement of ezrin in gastric acid secretion. Ezrin knockout (Vil2 − / −) mice did not survive >1.5 wk after birth, making difficult to examine gastric acid secretion. We then generated ezrin knockdown (Vil2 kd/kd) mice by introducing a neomycin resistance cassette between exons 2 and 3. Vil2 kd/kd mice born at the expected Mendelian ratio exhibited growth retardation and a high mortality. Approximately 7% of Vil2 kd/kd mice survived to adulthood. Ezrin protein levels in Vil2 kd/kd stomachs decreased to <5% of the wild-type levels without compensatory up-regulation of radixin or moesin. Adult Vil2 kd/kd mice suffered from severe achlorhydria. Immunofluorescence and electron microscopy revealed that this achlorhydria was caused by defects in the formation/expansion of canalicular apical membranes in gastric parietal cells.
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