Abstract
Pulsed electromagnetic fields (PEMF) used clinically to stimulate bone formation enhance the osteogenic effects of BMP-2 on human mesenchymal stem cells (MSCs) if the MSCs are grown in osteogenic medium and are cultured on calcium phosphate (CaP) surfaces rather than tissue culture polystyrene plastic (TCPS). This study tested if PEMF's effects on cells in the osteoblast lineage are substrate dependent and if factors produced by osteoblasts that regulate osteoclastic bone resorption, might also be regulated by PEMF. Human MSCs treated with BMP-2 and human osteoblast-like cells (normal human osteoblasts [NHOst cells], MG63 cells, SaOS-2 cells) were cultured on CaP or TCPS and their response to PEMF (4.5 ms bursts of 20 pulses repeating at 15 Hz for 8 h/day) determined as a function of decoy receptor osteoprotegerin (OPG) and RANK ligand (RANKL) production, both of which are associated with regulation of osteoclast differentiation. The results showed that when osteoblast-like cells were cultured on CaP, PEMF decreased cell number and increased production of paracrine factors associated with reduced bone resorption like OPG. RANKL was unaffected, indicating that the OPG/RANKL ratio was increased, further supporting a surface-dependent osteogenic effect of PEMF. Moreover, effects of estrogen were surface dependent and enhanced by PEMF, demonstrating that PEMF can modulate osteogenic responses to anabolic regulators of osteoblast function. These effects of PEMF would not be evident in models examining cells in traditional culture on plastic.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 437-444 |
| Number of pages | 8 |
| Journal | Annals of Biomedical Engineering |
| Volume | 37 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2009 |
| Externally published | Yes |
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Keywords
- Calcium phosphate substrates
- Mesenchymal stem cells and osteoblast lineage
- MG63 cells
- Osteoprotegerin
- Pulsed electromagnetic fields
- RANK ligand
- SaOS-2 cells
- Tissue culture polystyrene
ASJC Scopus subject areas
- Biomedical Engineering
Cite this
Osteoprotegerin (OPG) production by cells in the osteoblast lineage is regulated by pulsed electromagnetic fields in cultures grown on calcium phosphate substrates. / Schwartz, Zvi; Fisher, Maya; Lohmann, Christoph H.; Simon, Bruce J.; Boyan, Barbara D.
In: Annals of Biomedical Engineering, Vol. 37, No. 3, 03.2009, p. 437-444.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Osteoprotegerin (OPG) production by cells in the osteoblast lineage is regulated by pulsed electromagnetic fields in cultures grown on calcium phosphate substrates
AU - Schwartz, Zvi
AU - Fisher, Maya
AU - Lohmann, Christoph H.
AU - Simon, Bruce J.
AU - Boyan, Barbara D.
PY - 2009/3
Y1 - 2009/3
N2 - Pulsed electromagnetic fields (PEMF) used clinically to stimulate bone formation enhance the osteogenic effects of BMP-2 on human mesenchymal stem cells (MSCs) if the MSCs are grown in osteogenic medium and are cultured on calcium phosphate (CaP) surfaces rather than tissue culture polystyrene plastic (TCPS). This study tested if PEMF's effects on cells in the osteoblast lineage are substrate dependent and if factors produced by osteoblasts that regulate osteoclastic bone resorption, might also be regulated by PEMF. Human MSCs treated with BMP-2 and human osteoblast-like cells (normal human osteoblasts [NHOst cells], MG63 cells, SaOS-2 cells) were cultured on CaP or TCPS and their response to PEMF (4.5 ms bursts of 20 pulses repeating at 15 Hz for 8 h/day) determined as a function of decoy receptor osteoprotegerin (OPG) and RANK ligand (RANKL) production, both of which are associated with regulation of osteoclast differentiation. The results showed that when osteoblast-like cells were cultured on CaP, PEMF decreased cell number and increased production of paracrine factors associated with reduced bone resorption like OPG. RANKL was unaffected, indicating that the OPG/RANKL ratio was increased, further supporting a surface-dependent osteogenic effect of PEMF. Moreover, effects of estrogen were surface dependent and enhanced by PEMF, demonstrating that PEMF can modulate osteogenic responses to anabolic regulators of osteoblast function. These effects of PEMF would not be evident in models examining cells in traditional culture on plastic.
AB - Pulsed electromagnetic fields (PEMF) used clinically to stimulate bone formation enhance the osteogenic effects of BMP-2 on human mesenchymal stem cells (MSCs) if the MSCs are grown in osteogenic medium and are cultured on calcium phosphate (CaP) surfaces rather than tissue culture polystyrene plastic (TCPS). This study tested if PEMF's effects on cells in the osteoblast lineage are substrate dependent and if factors produced by osteoblasts that regulate osteoclastic bone resorption, might also be regulated by PEMF. Human MSCs treated with BMP-2 and human osteoblast-like cells (normal human osteoblasts [NHOst cells], MG63 cells, SaOS-2 cells) were cultured on CaP or TCPS and their response to PEMF (4.5 ms bursts of 20 pulses repeating at 15 Hz for 8 h/day) determined as a function of decoy receptor osteoprotegerin (OPG) and RANK ligand (RANKL) production, both of which are associated with regulation of osteoclast differentiation. The results showed that when osteoblast-like cells were cultured on CaP, PEMF decreased cell number and increased production of paracrine factors associated with reduced bone resorption like OPG. RANKL was unaffected, indicating that the OPG/RANKL ratio was increased, further supporting a surface-dependent osteogenic effect of PEMF. Moreover, effects of estrogen were surface dependent and enhanced by PEMF, demonstrating that PEMF can modulate osteogenic responses to anabolic regulators of osteoblast function. These effects of PEMF would not be evident in models examining cells in traditional culture on plastic.
KW - Calcium phosphate substrates
KW - Mesenchymal stem cells and osteoblast lineage
KW - MG63 cells
KW - Osteoprotegerin
KW - Pulsed electromagnetic fields
KW - RANK ligand
KW - SaOS-2 cells
KW - Tissue culture polystyrene
UR - http://www.scopus.com/inward/record.url?scp=59449092168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=59449092168&partnerID=8YFLogxK
U2 - 10.1007/s10439-008-9628-3
DO - 10.1007/s10439-008-9628-3
M3 - Article
C2 - 19139991
AN - SCOPUS:59449092168
VL - 37
SP - 437
EP - 444
JO - Annals of Biomedical Engineering
JF - Annals of Biomedical Engineering
SN - 0090-6964
IS - 3
ER -