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Nonlinear Osmotic Properties of the Cell Nucleus

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Abstract

In the absence of active volume regulation processes, cell volume is inversely proportional to osmolarity, as predicted by the Boyle Van’t Hoff relation. In this study, we tested the hypothesis that nuclear volume has a similar relationship with extracellular osmolarity in articular chondrocytes, cells that are exposed to changes in the osmotic environment in vivo. Furthermore, we explored the mechanism of the relationships between osmolarity and nuclear size and shape. Nuclear size was quantified using two independent techniques, confocal laser scanning microscopy and angle-resolved low coherence interferometry. Nuclear volume was osmotically sensitive but this relationship was not linear, showing a decline in the osmotic sensitivity in the hypo-osmotic range. Nuclear shape was also influenced by extracellular osmolarity, becoming smoother as the osmolarity decreased. The osmotically induced changes in nuclear size paralleled the changes in nuclear shape, suggesting that shape and volume are interdependent. The osmotic sensitivity of shape and volume persisted after disruption of the actin cytoskeleton. Isolated nuclei contracted in response to physiologic changes in macromolecule concentration but not in response to physiologic changes in ion concentration, suggesting solute size has an important influence on the osmotic pressurization of the nucleus. This finding in turn implies that the diffusion barrier that causes osmotic effects is not a semi-permeable membrane, but rather due to size constraints that prevent large solute molecules from entering small spaces in the nucleus. As nuclear morphology has been associated previously with cell phenotype, these findings may provide new insight into the role of mechanical and osmotic signals in regulating cell physiology.

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Acknowledgments

Supported by NIH Grants AR50245, AR48182, AG15768, and AR48852. We thank Dr. Mansoor Haider for many important discussions.

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  1. Department of Surgery, Duke University Medical Center, 375 MSRB, Box 3093, Durham, NC, 27710, USA

    John D. Finan & Farshid Guilak

  2. Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA

    John D. Finan, Kevin J. Chalut, Adam Wax & Farshid Guilak

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Finan, J.D., Chalut, K.J., Wax, A. et al. Nonlinear Osmotic Properties of the Cell Nucleus. Ann Biomed Eng 37, 477–491 (2009). https://doi.org/10.1007/s10439-008-9618-5

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