Synchrotron radiation X-ray micro-fluorescence: Protocol to study mesenchymal stem cells

ABSTRACT The micro‐X‐ray fluorescence by synchrotron radiation (μ‐XRF) is a method to determine the composition of tissues without destroying the samples. However, this technique has never been used for the analysis of mesenchymal stem cells (MSC). This study compared different protocols for fixing,...

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Bibliographic Details
Published in:Microscopy research and technique 2016-03, Vol.79 (3), p.149-154
Main Authors: Rezende, Karla Mayra, Bönecker, Marcelo, Perez, Carlos Alberto, Mantesso, Andrea
Format: Article
Language:English
Subjects:
Cells, Cultured
Crystals
Dilution
Droplets
Histocytochemistry - methods
Human
Humans
Mesenchymal Stromal Cells - chemistry
Mesenchymal Stromal Cells - cytology
Metals - analysis
Metals - chemistry
Microscopy
Microscopy, Fluorescence - methods
protocols
Spectrometry, X-Ray Emission - methods
Stem cells
Synchrotron radiation
Synchrotrons
trace elements
X-ray analysis
X-rays
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Summary:ABSTRACT The micro‐X‐ray fluorescence by synchrotron radiation (μ‐XRF) is a method to determine the composition of tissues without destroying the samples. However, this technique has never been used for the analysis of mesenchymal stem cells (MSC). This study compared different protocols for fixing, storing, preserving, and establishing the correct numbers of dental derived MSC submitted to μ‐XRF analysis. Stem cells were obtained from human dental tissue. After cell expansion, and MACS isolation, the samples were fixed and the following quantities of cells 1 × 104 to 1 × 107 were divided in two groups: G1: fixed in 4% paraformaldehyde diluted in phosphate‐buffered saline solution, and G2: fixed in 4% paraformaldehyde diluted in MilliQ water. The G1 cells showed precipitation of chemical components from the solution resulting in the formation of salt crystals while G2 cells were clear and almost transparent in the sample holder. With regards to cells concentration, the best results occurred when four droplets of 1 × 107 cells were analyzed. This work shows that to identify and study the distribution of trace elements in MSC by μ‐XRF, the best protocol is fixation in 4% paraformaldehyde diluted with MilliQ water at 4°C and a concentration of four incremental droplets of 1 × 107 cells. Microsc. Res. Tech. 79:149–154, 2016. © 2016 Wiley Periodicals, Inc.
ISSN:1059-910X
1097-0029
DOI:10.1002/jemt.22615