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NUANCE: Nanoscale Characterization Experimental Center

NUANCE Staff and VPD researchers publish paper in Experimental Cell Research

A research paper co-authored by NUANCE's Eric W. Roth, Reiner Bleher,  Vinayak Dravid, and members Professor Dravid's research group has been published in the journal Experimental Cell Research.

The effects of chemical fixation on the cellular nanostructure

Yue Li, Luay M. Almassalha, John E. Chandler, Xiang Zhou, Yolanda E. Stypula-Cyrus, Karl A. Hujsak, Eric W. Roth, Reiner Bleher, Hariharan Subramanian, Igal Szleifer, Vinayak P. Dravid, Vadim Backman.


Chemical fixation is nearly indispensable in the biological sciences, especially in circumstances where cryo-full image resizedfixation is not applicable. While universally employed for the preservation of cell organization, chemical fixatives often introduce artifacts that can confound identification of true structures. Since biological research is increasingly probing ever-finer details of the cellular architecture, it is critical to understand the nanoscale transformation of the cellular organization due to fixation both systematically and quantitatively. In this work, we employed Partial Wave Spectroscopic (PWS) Microscopy, a nanoscale sensitive and label-free live cell spectroscopic-imaging technique, to analyze the effects of the fixation process through three commonly used fixation protocols for cells in vitro. In each method investigated, we detected dramatic difference in both nuclear and cytoplasmic nanoarchitecture between live and fixed states. But significantly, despite the alterations in cellular nanoscale organizations after chemical fixation, the population differences in chromatin structure (e.g. induced by a specific chemotherapeutic agent) remains. In conclusion, we demonstrated that the nanoscale cellular arrangement observed in fixed cells was fundamentally divorced from that in live cells, thus the quantitative analysis is only meaningful on the population level. This finding highlights the importance of live cell imaging techniques with nanoscale sensitivity or cryo-fixation in the interrogation of cellular structure, to complement more traditional chemical fixation methods.

The research made use of NUANCE's EPIC facility for its TEM imagery.


The full article can be found here.