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J Dent Res:tricellulin调节唾液腺中大分子的转运

2020-03-16 网络 网络

唾液的量和组成对于口腔和全身健康至关重要。尚未具体确定物质,尤其是大分子如何跨唾液腺上皮运输。 Tricellulin是三细胞紧密连接的组成部分,紧密连接形成中央管,作为大分子运输的重要途径。尚不清楚

唾液的量和组成对于口腔和全身健康至关重要。尚未具体确定物质,尤其是大分子如何跨唾液腺上皮运输。 Tricellulin是三细胞紧密连接的组成部分,紧密连接形成中央管,作为大分子运输的重要途径。尚不清楚Tricellulin是否在下颌下腺(SMG)中表达并参与唾液分泌。

本文通过使用蛋白质印迹法和免疫荧光法,发现tricellulin特征性地定位在人,大鼠和小鼠SMG的三细胞连接处。敲低tricellulin会显着增加40kDa而非4kDa异硫氰酸荧光素-葡聚糖的细胞旁通透性, tricellulin的过表达则会显着降低通透性,而跨上皮电阻不受影响。相反,claudin-4的敲低和过表达影响跨上皮电阻,但不影响40kDa异硫氰酸荧光素-葡聚糖的转运,这表明tricellulin调节大分子的转运,而不是离子,离子主要由双细胞紧密连接(bTJs)调节。此外,在胆碱刺激的SMG组织和细胞中,三细胞膜从三细胞膜动态重新分布到双细胞膜。含免疫球蛋白样结构域的受体1(ILDR1)募集tricellulin与三细胞接触。 Ildr1-/-小鼠的唾液中大分子的比例增加,而刺激唾液的量没有变化,这在SMG中显示出异常的tricellulin分布。此外,在大鼠SMG上皮极化细胞系SMG-C6中,tricellulin与bTJ蛋白相互作用,例如occludin,claudin-1,claudin-3,claudin-4和ZO-1。敲低tricellulin降低了闭合蛋白水平。

本文揭示了tricellulin在SMG上皮细胞中的特异性表达模式。tricellulin不仅作为大分子的屏障,还可调节bTJ与紧密连接复合物的连接。tricellulin表达和分布的改变可由此改变唾液组成。我们的研究为唾液腺紧密连接的组织和功能提供了新颖的见解。

原始出处:

S. N. Min, et al. Tricellulin Modulates Transport of Macromolecules in the Salivary Gland. Journal of Dental Research. 2019,December 20. doi: 10.1177/0022034519896749

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    2023-11-20 侠胆医心 来自威斯康星

    #tricellulin#调节#唾液腺#中大分子的转运#颌下腺#

    0

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    2020-09-29 docwu2019
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    2020-08-03 yzh409
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孕期常见症状有:早孕反应、孕期便秘、痔疮、乳房胀痛、尿频、尿急、胃区不适、背痛、下肢肌肉痉挛、眩晕、阴道分泌物增多、水肿、贫血、皮肤瘙痒、腹痛……

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