Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells

P. Raval, H. H T Hsu, D. J. Schneider, Jr Sarras M.P., K. Masuhara, Lynda Bonewald, H. C. Anderson

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Freeze-dried Saos-2, human osteosarcoma cells, and extracts of Saos-2 cells contain all components necessary to induce ectopic new bone and marrow when implanted into athymic Nu/Nu nuce. On the other hand, human osteosarcoma cells of the U-2 OS strain failed to induce bone formation under the same experimental conditions. Our aim was to compare the relative expressions of known osteoinductive factors including bone morphogenetic proteins (BMPs) and transforming growth factor-β (TGF-β) in these two cell lines in an attempt to explain the unique bone-inducing ability of the Saos-2 cells. Saos-2 cells expressed mRNA for BMP-1, -2, -3, -4, -6, and TGF-β1. The non-osteoinductive U-2 OS cells expressed BMP-2, -4, -5, -6, and -7 as well as TGF-β1 mRNA, while levels of BMP-1 and BMP-3 mRNA were either not detectable or detectable at a very low level in U-2 OS cells. The presence of BMP-1 and -4 protein was confirmed in Saos-2 cells by immunofluorescence, and TGFβ protein was demonstrated by bioassay in both cell types. These findings suggest that Saos-2 cells are endowed qualitatively and quantitatively with sufficient amounts of many bone morphogenetic proteins - especially BMP-1, -3, and -4 - to confer osteoinductivity upon these cells. However, the absence of osteoinductivity in U-2 OS cells, despite significant mRNA expression levels of several bone morphogenetic proteins, suggests that, even though expression of one or more bone morphogenetic proteins may be present, it may not necessarily be sufficient to confer osteoinductivity upon U-2 OS cells. U-2 OS cells may be non-osteoinductive because (1) they contain inhibitors to the BMPs or secrete inhibitory binding proteins, (2) they do not process BMPs correctly, or (3) the BMPs are inappropriately localized and sequestered within the U-2 OS cells. Saos 2 cells may be osteoinductive because (1) they uniquely express BMP-1, (2) they express an appropriate combination of interactive BMPs at appropriate levels, and/or (3) the Saos-2 cells elaborate asyet -unidentified osteoinductive factor(s).

Original languageEnglish (US)
Pages (from-to)1518-1523
Number of pages6
JournalJournal of Dental Research
Volume75
Issue number7
StatePublished - 1996
Externally publishedYes

Fingerprint

Bone Morphogenetic Proteins
Osteosarcoma
Bone Morphogenetic Protein 1
Bone Morphogenetic Protein 3
Bone Morphogenetic Protein 2
Transforming Growth Factors
Bone Morphogenetic Protein 4
Messenger RNA
Cell Extracts

Keywords

  • Bone morphogenetic protein
  • Ectopic bone
  • Endochondral bone formation
  • Osteoinduction
  • Osteosarcoma cell
  • Transforming growth factor-beta

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Raval, P., Hsu, H. H. T., Schneider, D. J., Sarras M.P., J., Masuhara, K., Bonewald, L., & Anderson, H. C. (1996). Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells. Journal of Dental Research, 75(7), 1518-1523.

Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells. / Raval, P.; Hsu, H. H T; Schneider, D. J.; Sarras M.P., Jr; Masuhara, K.; Bonewald, Lynda; Anderson, H. C.

In: Journal of Dental Research, Vol. 75, No. 7, 1996, p. 1518-1523.

Research output: Contribution to journalArticle

Raval, P, Hsu, HHT, Schneider, DJ, Sarras M.P., J, Masuhara, K, Bonewald, L & Anderson, HC 1996, 'Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells', Journal of Dental Research, vol. 75, no. 7, pp. 1518-1523.
Raval, P. ; Hsu, H. H T ; Schneider, D. J. ; Sarras M.P., Jr ; Masuhara, K. ; Bonewald, Lynda ; Anderson, H. C. / Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells. In: Journal of Dental Research. 1996 ; Vol. 75, No. 7. pp. 1518-1523.
@article{52521260f0f74069a6e858e7c5ebd02b,
title = "Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells",
abstract = "Freeze-dried Saos-2, human osteosarcoma cells, and extracts of Saos-2 cells contain all components necessary to induce ectopic new bone and marrow when implanted into athymic Nu/Nu nuce. On the other hand, human osteosarcoma cells of the U-2 OS strain failed to induce bone formation under the same experimental conditions. Our aim was to compare the relative expressions of known osteoinductive factors including bone morphogenetic proteins (BMPs) and transforming growth factor-β (TGF-β) in these two cell lines in an attempt to explain the unique bone-inducing ability of the Saos-2 cells. Saos-2 cells expressed mRNA for BMP-1, -2, -3, -4, -6, and TGF-β1. The non-osteoinductive U-2 OS cells expressed BMP-2, -4, -5, -6, and -7 as well as TGF-β1 mRNA, while levels of BMP-1 and BMP-3 mRNA were either not detectable or detectable at a very low level in U-2 OS cells. The presence of BMP-1 and -4 protein was confirmed in Saos-2 cells by immunofluorescence, and TGFβ protein was demonstrated by bioassay in both cell types. These findings suggest that Saos-2 cells are endowed qualitatively and quantitatively with sufficient amounts of many bone morphogenetic proteins - especially BMP-1, -3, and -4 - to confer osteoinductivity upon these cells. However, the absence of osteoinductivity in U-2 OS cells, despite significant mRNA expression levels of several bone morphogenetic proteins, suggests that, even though expression of one or more bone morphogenetic proteins may be present, it may not necessarily be sufficient to confer osteoinductivity upon U-2 OS cells. U-2 OS cells may be non-osteoinductive because (1) they contain inhibitors to the BMPs or secrete inhibitory binding proteins, (2) they do not process BMPs correctly, or (3) the BMPs are inappropriately localized and sequestered within the U-2 OS cells. Saos 2 cells may be osteoinductive because (1) they uniquely express BMP-1, (2) they express an appropriate combination of interactive BMPs at appropriate levels, and/or (3) the Saos-2 cells elaborate asyet -unidentified osteoinductive factor(s).",
keywords = "Bone morphogenetic protein, Ectopic bone, Endochondral bone formation, Osteoinduction, Osteosarcoma cell, Transforming growth factor-beta",
author = "P. Raval and Hsu, {H. H T} and Schneider, {D. J.} and {Sarras M.P.}, Jr and K. Masuhara and Lynda Bonewald and Anderson, {H. C.}",
year = "1996",
language = "English (US)",
volume = "75",
pages = "1518--1523",
journal = "Journal of Dental Research",
issn = "0022-0345",
publisher = "SAGE Publications Inc.",
number = "7",

}

TY - JOUR

T1 - Expression of bone morphogenetic proteins by osteoinductive and non-osteoinductive human osteosarcoma cells

AU - Raval, P.

AU - Hsu, H. H T

AU - Schneider, D. J.

AU - Sarras M.P., Jr

AU - Masuhara, K.

AU - Bonewald, Lynda

AU - Anderson, H. C.

PY - 1996

Y1 - 1996

N2 - Freeze-dried Saos-2, human osteosarcoma cells, and extracts of Saos-2 cells contain all components necessary to induce ectopic new bone and marrow when implanted into athymic Nu/Nu nuce. On the other hand, human osteosarcoma cells of the U-2 OS strain failed to induce bone formation under the same experimental conditions. Our aim was to compare the relative expressions of known osteoinductive factors including bone morphogenetic proteins (BMPs) and transforming growth factor-β (TGF-β) in these two cell lines in an attempt to explain the unique bone-inducing ability of the Saos-2 cells. Saos-2 cells expressed mRNA for BMP-1, -2, -3, -4, -6, and TGF-β1. The non-osteoinductive U-2 OS cells expressed BMP-2, -4, -5, -6, and -7 as well as TGF-β1 mRNA, while levels of BMP-1 and BMP-3 mRNA were either not detectable or detectable at a very low level in U-2 OS cells. The presence of BMP-1 and -4 protein was confirmed in Saos-2 cells by immunofluorescence, and TGFβ protein was demonstrated by bioassay in both cell types. These findings suggest that Saos-2 cells are endowed qualitatively and quantitatively with sufficient amounts of many bone morphogenetic proteins - especially BMP-1, -3, and -4 - to confer osteoinductivity upon these cells. However, the absence of osteoinductivity in U-2 OS cells, despite significant mRNA expression levels of several bone morphogenetic proteins, suggests that, even though expression of one or more bone morphogenetic proteins may be present, it may not necessarily be sufficient to confer osteoinductivity upon U-2 OS cells. U-2 OS cells may be non-osteoinductive because (1) they contain inhibitors to the BMPs or secrete inhibitory binding proteins, (2) they do not process BMPs correctly, or (3) the BMPs are inappropriately localized and sequestered within the U-2 OS cells. Saos 2 cells may be osteoinductive because (1) they uniquely express BMP-1, (2) they express an appropriate combination of interactive BMPs at appropriate levels, and/or (3) the Saos-2 cells elaborate asyet -unidentified osteoinductive factor(s).

AB - Freeze-dried Saos-2, human osteosarcoma cells, and extracts of Saos-2 cells contain all components necessary to induce ectopic new bone and marrow when implanted into athymic Nu/Nu nuce. On the other hand, human osteosarcoma cells of the U-2 OS strain failed to induce bone formation under the same experimental conditions. Our aim was to compare the relative expressions of known osteoinductive factors including bone morphogenetic proteins (BMPs) and transforming growth factor-β (TGF-β) in these two cell lines in an attempt to explain the unique bone-inducing ability of the Saos-2 cells. Saos-2 cells expressed mRNA for BMP-1, -2, -3, -4, -6, and TGF-β1. The non-osteoinductive U-2 OS cells expressed BMP-2, -4, -5, -6, and -7 as well as TGF-β1 mRNA, while levels of BMP-1 and BMP-3 mRNA were either not detectable or detectable at a very low level in U-2 OS cells. The presence of BMP-1 and -4 protein was confirmed in Saos-2 cells by immunofluorescence, and TGFβ protein was demonstrated by bioassay in both cell types. These findings suggest that Saos-2 cells are endowed qualitatively and quantitatively with sufficient amounts of many bone morphogenetic proteins - especially BMP-1, -3, and -4 - to confer osteoinductivity upon these cells. However, the absence of osteoinductivity in U-2 OS cells, despite significant mRNA expression levels of several bone morphogenetic proteins, suggests that, even though expression of one or more bone morphogenetic proteins may be present, it may not necessarily be sufficient to confer osteoinductivity upon U-2 OS cells. U-2 OS cells may be non-osteoinductive because (1) they contain inhibitors to the BMPs or secrete inhibitory binding proteins, (2) they do not process BMPs correctly, or (3) the BMPs are inappropriately localized and sequestered within the U-2 OS cells. Saos 2 cells may be osteoinductive because (1) they uniquely express BMP-1, (2) they express an appropriate combination of interactive BMPs at appropriate levels, and/or (3) the Saos-2 cells elaborate asyet -unidentified osteoinductive factor(s).

KW - Bone morphogenetic protein

KW - Ectopic bone

KW - Endochondral bone formation

KW - Osteoinduction

KW - Osteosarcoma cell

KW - Transforming growth factor-beta

UR - http://www.scopus.com/inward/record.url?scp=0030307259&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030307259&partnerID=8YFLogxK

M3 - Article

C2 - 8876605

AN - SCOPUS:0030307259

VL - 75

SP - 1518

EP - 1523

JO - Journal of Dental Research

JF - Journal of Dental Research

SN - 0022-0345

IS - 7

ER -