Intestinal brush border assembly driven by protocadherin-based intermicrovillar adhesion

Scott W. Crawley, David A. Shifrin, Nathan E. Grega-Larson, Russell E. McConnell, Andrew E. Benesh, Suli Mao, Yuxi Zheng, Qing Yin Zheng, Ki Taek Nam, Bryan A. Millis, Bechara Kachar, Matthew J. Tyska

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Abstract

Transporting epithelial cells build apical microvilli to increase membrane surface area and enhance absorptive capacity. The intestinal brush border provides an elaborate example with tightly packed microvilli that function in nutrient absorption and host defense. Although the brush border is essential for physiological homeostasis, its assembly is poorly understood. We found that brush border assembly is driven by the formation of Ca2+-dependent adhesion links between adjacent microvilli. Intermicrovillar links are composed of protocadherin-24 and mucin-like protocadherin, which target to microvillar tips and interact to form a trans-heterophilic complex. The cytoplasmic domains of microvillar protocadherins interact with the scaffolding protein, harmonin, and myosin-7b, which promote localization to microvillar tips. Finally, a mouse model of Usher syndrome lacking harmonin exhibits microvillar protocadherin mislocalization and severe defects in brush border morphology. These data reveal an adhesion-based mechanism for brush border assembly and illuminate the basis of intestinal pathology in patients with Usher syndrome. PaperFlick

Original languageEnglish
Pages (from-to)433-446
Number of pages14
JournalCell
Volume157
Issue number2
DOIs
Publication statusPublished - 2014 Apr 10

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All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Crawley, S. W., Shifrin, D. A., Grega-Larson, N. E., McConnell, R. E., Benesh, A. E., Mao, S., Zheng, Y., Zheng, Q. Y., Nam, K. T., Millis, B. A., Kachar, B., & Tyska, M. J. (2014). Intestinal brush border assembly driven by protocadherin-based intermicrovillar adhesion. Cell, 157(2), 433-446. https://doi.org/10.1016/j.cell.2014.01.067