Characteristics of rodent intestinal mucin Muc3 and alterations in a mouse model of human cystic fibrosis.

Characteristics of rodent intestinal mucin Muc3 and alterations in a mouse model of human cystic fibrosis.
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啮齿动物肠道粘蛋白 Muc3 的特征以及人类囊性纤维化小鼠模型中的变化。

DOI:
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发表时间:
2001
期刊:
American Journal of Physiology - Gastrointestinal and Liver Physiology
影响因子:
--
通讯作者:
J. Forstner
J. Forstner
中科院分区:
--
文献类型:
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作者:
I. Khatri;C. Ho;R. Specian;J. Forstner

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人类粘蛋白MUC3和啮齿动物Muc3被广泛认为代表在肠的柱状细胞和杯状细胞中表达的分泌性粘蛋白。使用3'-寡核苷酸探针和原位杂交,我们观察到大鼠Muc3主要在柱状细胞中表达。两种对位于柱状细胞顶膜和细胞质的 Muc3 COOH 末端表位具有特异性的抗体。然而,串联重复 (TR) 序列 (TTTPDV)3 的抗体定位于柱状细胞和杯状细胞。在 CsCl 梯度上,Muc3 出现在轻密度和重密度组分中。较轻的物种与所有三种抗体均发生免疫反应,而较重的物种仅与抗TR抗体发生反应。因此,Muc3 以两种形式表达,柱状细胞中存在的全长膜相关形式(轻密度)和杯状细胞中存在的羧基截短的可溶形式(重密度)。在人类囊性纤维化的小鼠模型中,可溶性 Muc3 和杯状细胞 Muc2 的数量均增加且分泌过多。因此,Muc2 和 Muc3 导致囊性纤维化小鼠肠腔粘液过多。
Human mucin MUC3 and rodent Muc3 are widely assumed to represent secretory mucins expressed in columnar and goblet cells of the intestine. Using a 3'-oligonucleotide probe and in situ hybridization, we observed expression of rat Muc3 mostly in columnar cells. Two antibodies specific for COOH-terminal epitopes of Muc3 localized to apical membranes and cytoplasm of columnar cells. An antibody to the tandem repeat (TR) sequence (TTTPDV)3, however, localized to both columnar and goblet cells. On CsCl gradients, Muc3 appeared in both light- and heavy-density fractions. The lighter species was immunoreactive with all three antibodies, whereas the heavier species reacted only with anti-TR antibody. Thus Muc3 is expressed in two forms, a full-length membrane-associated form found in columnar cells (light density) and a carboxyl-truncated soluble form present in goblet cells (heavy density). In a mouse model of human cystic fibrosis, both soluble Muc3 and goblet cell Muc2 were increased in amount and hypersecreted. Thus Muc2 and Muc3 contribute to the excess intestinal luminal mucus of cystic fibrosis mice.
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细胞表面唾液粘蛋白​​和对大鼠乳腺肿瘤腹水细胞天然细胞介导的细胞毒性的抵抗。
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发表时间: 1986
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