The cover image of the June 16 issue of Biophysical Journal is based on Figure 6 of our study on the role of the polarity protein Crumbs2 (CRB2) within kidney podocytes. The image highlights podocyte architecture during a moment of cellular reorganization. Rather than showing a static cellular structure, the image captures a dynamic biological process. Cells expressing CRB2 possess the ability to sense their neighbors and mechanically adapt to their environment, whereas CRB2-deficient cells lack this ability.
The image originates from high-resolution confocal fluorescence microscopy of cultured human kidney podocytes. Actin filaments are shown in cyan while the cellular adhesion marker vinculin appears in red. CRB2 has been known for its role in establishing and maintaining epithelial polarity. Our work expands on this view, revealing how CRB2 behaves as a dynamic cellular sensor. When CRB2-positive podocytes encounter neighboring CRB2-positive cells, they do not simply form stronger static connections. Instead, they undergo a profound reorganization of their cytoskeleton and focal adhesions, leading to a markedly stronger attachment to their extracellular matrix.
The biological process studied in this article is directly relevant to kidney health and disease. Podocyte dysfunction is a hallmark of many severe kidney disorders, including diseases associated with proteinuria and progressive renal failure. Understanding how podocytes sense neighboring cells, regulate adhesion, and maintain mechanical stability may help explain why the filtration barrier breaks down in disease.
The significance of CRB2, however, extends beyond the kidney. The ability of cells to interpret mechanical and spatial cues from their neighbors is fundamental to tissue formation and organ development, particularly in highly structured tissues in which cellular polarity and architecture must be tightly controlled. CRB2 is also essential for the development of the brain and retina, highlighting its broader importance in tissue organization. This study provides an insight into the mechanisms by which cells respond to contact and mechanical forces, helping to shape and maintain tissue architecture during development and disease.
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— Rohan Bhatia, Annika Möller-Kerutt, Sven Gerlach, Yannick Herfs, Rebecca Rixen, Hermann Pavenstädt, Bernd Hoffmann, Rudolf Merkel, Ulrich Kubitscheck, Thomas Weide, and Jan Peter Siebrasse