Hydrogen/Potassium Atpase and Gastric Acid Secretion

描述(由申请人提供) 胃酸分泌有助于溃疡的形成，而胃酸分泌的控制是 用来促进溃疡愈合的药物的主要靶点。 因此，对细胞和分子机制有了更深入的了解 在未来的努力中，控制胃酸分泌将是非常有价值的 解释溃疡的发病机制，治疗溃疡的病理。 H，K-ATPase n-亚基的胞质尾部含有酪氨酸 内吞作用基序，它是细胞重新内化所必需的 全酶，因此有助于停止胃酸分泌 在转基因动物身上。然而，这种内吞作用的机制 信号被沉默，以允许胃部长时间分泌胃酸 刺激措施尚未确定。有人提出，细胞骨架 在顶端分泌小管膜下面防止IS-亚单位的 全酶介导的组成性内吞信号 内部化。随着转基因小鼠的利用，其作用 H，K-ATPase调节胃酸的分子结构域鉴定 分泌物可能会被阐明。

DESCRIPTION (provided by applicant) Gastric acid secretion contributes to ulcer formation and its control is one of the primary targets of pharmacologic agents employed to promote ulcer healing. Thus, a more thorough understanding of the cellular and molecular mechanisms which control acid secretion will be extremely valuable in future efforts to explain ulcer pathogenesis and treat ulcer pathology. The cytoplasmic tail of the H,K-ATPase n-subunit possesses a tyrosine-based endocytosis motif which is necessary for the re-internalization of the holoenzyme and therefore contributes to the cessation of gastric acid secretion in transgenic animals. However, the mechanism through which this endocytosis signal is silenced to permit prolonged acid secretion during gastric stimulation has yet to be determined. It is proposed that the cytoskeleton that underlies the apical secretory canalicular membrane prevents the Is-subunit's constitutive endocytosis signal from mediating the holoenzyme's internalization. With the utilization of transgenic mice, the role of identified molecular domains in the H,K-ATPase in regulating gastric acid secretion may be elucidated.