Chondrogenic differentiation of mesenchymal stem cells is inhibited after magnetic labeling with ferumoxides by Jeff W. M. Bulte, Dara L. Kraitchman, Alastair.

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Chondrogenic differentiation of mesenchymal stem cells is inhibited after magnetic labeling with ferumoxides by Jeff W. M. Bulte, Dara L. Kraitchman, Alastair M. Mackay, and Mark F. Pittenger Blood Volume 104(10):3410-3413 November 15, 2004 ©2004 by American Society of Hematology

Chondrogenic differentiation of MSCs is inhibited after magnetic labeling with ferumoxides. Chondrogenic differentiation of MSCs is inhibited after magnetic labeling with ferumoxides. Human MSCs exposed to TA-Fe (A-C) exhibit normal viability, with Prussian Blue staining revealing Fe-containing cells throughout the pellet (B), but fail to demonstrate chondrogenic differentiation (A,C). In contrast, donor MSCs unexposed to TA-Fe exhibit normal chondrogenesis (D-F). To further prove that Fe labeling inhibits chondrogenic differentiation, experiments were performed with 50:50 mixtures of TA-Fe-labeled and unlabeled MSCs (G-I). Only unlabeled, non-Fe-labeled cells (Prussian Blue-negative region in panel H) demonstrate chondrogenesis. Thus, the inhibition of chondrogenesis is mediated by Fe, and not by the TA, as MSCs labeled with only TA (J-L) differentiate normally. All experiments were performed with the same donor cells and passage number. Bar in panel A represents 400 μm. Thin sections of pellets were cleared though xylene and ethanol, then rehydrated. For collagen II indirect immunostaining, sections were reacted against monoclonal antibody C4F6; the brown positive signal was composed of precipitated di-amino-benzidine (DAB). Prussian Blue and safranin O stains were performed as previously described. Sections stained for collagen II and safranin O were also briefly exposed to hematoxylin, to color nuclei blue. Once staining was complete, sections were dehydrated and mounted under No. 1 coverslip glass in Permount (Fisher Scientific, Hampton, NH). The slides were observed at room temperature (22°C) with an Eclipse E400 microscope (Nikon USA, Melville, NY), using a Nikon Plan Fluor 4×/0.13 dry objective lens. Digital images were captured with an attached SPOT RT Slider 2.3.0 digital camera (Digital Instruments, Sterling Heights, MI) using the manufacturer's proprietary capture software (SPOT 4.0.5). Files saved under the JPEG format were then opened in Photoshop 6.0 (Adobe Systems, San Jose, CA), cropped, and combined into a single composite image. Red-Green-Blue colorspace was then adjusted with a single use of the “Levels” command for each set of four similarly-stained pellet sections. Jeff W. M. Bulte et al. Blood 2004;104:3410-3413 ©2004 by American Society of Hematology

Chondrogenic differentiation is not inhibited by Fe-Pro labeling. Chondrogenic differentiation is not inhibited by Fe-Pro labeling. Both unlabeled (A) and Fe-Pro-labeled (B) MSC pellets exhibited similar distributions of Alcian blue-stained glycosaminoglycans. Inset shows magnified view (× 100). Staining with collagen X (normally present only in hypertrophic chondrocytes, fetal cartilage, cartilage at growth plates of long bones, and neoplasms arising from chondrocytes) followed by Prussian Blue (PB) shows positive collagen X expression both in unlabeled (C) and Fe-Pro-labeled (D) MSC pellets.4 Magnified view shows collagen X expression in iron-positive cells (E, multiple arrows). Note the lack of Alcian blue stain and expression of collagen X in the cells around extracellular iron oxide complexes (arrow in B, arrow in D). The bars on A-D represent 100 μm and the bar on E represents 20 μm. Photomicrographs were visualized under a Zeiss Axioplan Imaging II microscope (Carl Zeiss, Oberkochen, Germany) equipped with 10×/0.50 (A-D) or 100×/1.30 (A inset, B inset, E) oil immersion objective lenses (Carl Zeiss). Images were acquired with Axiovision 4 software (Carl Zeiss) and processed with Adobe Photoshop 7.0 software (Adobe, San Jose, CA). Jeff W. M. Bulte et al. Blood 2004;104:3410-3413 ©2004 by American Society of Hematology