Size homeostasis in adherent cells studied by synthetic phase microscopy
Author(s)
Sung, Yongjin; Tzur, Amit; Oh, Seungeun; Choi, Wonshik; Li, Victor; Dasari, Ramachandra Rao; Yaqoob, Zahid; Kirschner, Marc W.; ... Show more Show less
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The coupling of the rate of cell growth to the rate of cell division determines cell size, a defining characteristic that is central to cell function and, ultimately, to tissue architecture. The physiology of size homeostasis has fascinated generations of biologists, but the mechanism, challenged by experimental limitations, remains largely unknown. In this paper, we propose a unique optical method that can measure the dry mass of thick live cells as accurately as that for thin cells with high computational efficiency. With this technique, we quantify, with unprecedented accuracy, the asymmetry of division in lymphoblasts and epithelial cells. We can then use the Collins–Richmond model of conservation to compute the relationship between growth rate and cell mass. In attached epithelial cells, we find that due to the asymmetry in cell division and size-dependent growth rate, there is active regulation of cell size. Thus, like nonadherent cells, size homeostasis requires feedback control.
Date issued
2013-10Department
Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Spectroscopy LaboratoryJournal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences (U.S.)
Citation
Sung, Y., A. Tzur, S. Oh, W. Choi, V. Li, R. R. Dasari, Z. Yaqoob, and M. W. Kirschner. “Size Homeostasis in Adherent Cells Studied by Synthetic Phase Microscopy.” Proceedings of the National Academy of Sciences 110, no. 41 (October 8, 2013): 16687–16692.
Version: Final published version
ISSN
0027-8424
1091-6490