A polyamine pathway-mediated mitogenic mechanism in enterochromaffin-like cells of Mastomys.

A polyamine pathway-mediated mitogenic mechanism in enterochromaffin-like cells of Mastomys.
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乳鼠肠嗜铬样细胞中多胺途径介导的有丝分裂机制。

DOI:
10.1152/ajpgi.1998.275.2.g370
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发表时间:
1998
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Modlin,IM
Modlin,IM
中科院分区:
--
文献类型:
--
作者:
Kidd,M;Tang,LH;Schmid,SW;Miu,K;Modlin,IM

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我们之前已经证明,在乳突物种中,胃肠色素样细胞(ECL)的增殖在初始状态和肿瘤状态下分别主要受胃泌素和转化生长因子-α (TGF-α)的调节。在这项研究中,我们研究了这些细胞内有丝分裂反应是否由多胺和鸟氨酸脱羧酶(ODC)介导,ODC是多胺生物合成的限速酶。采用高纯度的ECL细胞制剂,测定了多胺衍生物腐胺、亚精胺和精胺对溴脱氧尿嘧啶摄取合成DNA的影响。腐胺和亚精胺都增强了胃泌素刺激的原始细胞的DNA合成,而不是基础的DNA合成。这种增殖反应与ODC活性的增加相关,ODC活性被ODC抑制剂二氟甲基鸟氨酸(DFMO)部分抑制(20%)(IC50, 30 pM)。相比之下,所有多胺均增加肿瘤ECL细胞中基础和TGF-α刺激的DNA合成以及ODC活性。DFMO完全抑制TGF-α的增殖反应(IC50, 3pm)。因此,多胺生物合成参与了ECL细胞的增殖,特别是肿瘤细胞的有丝分裂发生,这表明该途径在ECL细胞转化的调节中起作用。
We have previously demonstrated that inMastomysspecies proliferation of gastric enterochromaffin-like (ECL) cells is predominantly regulated by gastrin and by transforming growth factor-α (TGF-α) in the naive and neoplastic state, respectively. In this study we examined whether these intracellular mitogenic responses are mediated by polyamines and ornithine decarboxylase (ODC), the rate-limiting enzyme for polyamine biosynthesis. An ECL cell preparation of high purity was used to measure the effect of the polyamine derivatives putrescine, spermidine, and spermine on DNA synthesis by bromodeoxyuridine uptake. Both putrescine and spermidine augmented gastrin-stimulated, but not basal, DNA synthesis in naive cells. This proliferative response correlated with an increase in ODC activity that was partially inhibited (20%) by difluoromethylornithine (DFMO), an inhibitor of ODC (IC50, 30 pM). In contrast, all polyamines increased both basal and TGF-α-stimulated DNA synthesis as well as ODC activity in tumor ECL cells. DFMO completely inhibited the proliferative response of TGF-α (IC50, 3 pM). Thus polyamine biosynthesis is involved in proliferation of ECL cells and in particular the mitogenesis of tumor cells, suggesting a role for this pathway in the regulation of ECL cell transformation.
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