Effects of combining transforming growth factor β and 1,25-dihydroxyvitamin D3 on differentiation of a human osteosarcoma (MG-63)

Lynda Bonewald, Mary Beth Kester, Zvi Schwartz, Larry D. Swain, Aruna Khare, Teresa L. Johnson, Robin J. Leach, Barbara D. Boyan

Research output: Contribution to journalArticle

184 Citations (Scopus)

Abstract

Transforming growth factor β (TGFβ) and 1,25-dihydroxyvitamin D3 (1,25D3), when added simultaneously to a human osteosarcoma cell line, MG-63, induce alkaline phosphatase activity 40-70-fold over basal levels, 6-7-fold over 1,25D3 treatment alone, and 15-20-fold over TGFβ treatment alone. TGFβ and 1,25D3 synergistically increased alkaline phosphatase specific activity in both matrix vesicles and plasma membrane isolated from the cultures, but the specific activity was greater in and targeted to the matrix vesicle fraction. Inhibitor and cleavage studies proved that the enzymatic activity was liver/bone/kidney alkaline phosphatase. Preincubation of MG-63 cells with TGFβ for 30 min before addition of 1,25D3 was sufficient for maximal induction of enzyme activity. Messenger RNA for liver/bone/kidney alkaline phosphatase was increased 2.1-fold with TGFβ, 1.7-fold with 1,25D3, and 4.8-fold with the combination at 72 h. Human alkaline phosphatase protein as detected by radioimmunoassay was stimulated only 6.3-fold over control levels with the combination. This combination of factors was tested for their effect on production of three other osteoblast cell proteins: collagen type I, osteocalcin, and fibronectin. TGFβ inhibited 1,25D3-induced osteocalcin production, whereas both factors were additive for fibronectin and collagen type I production. TGFβ appears to modulate the differentiation effects of 1,25D3 on this human osteoblast-like cell and thereby retain the cell in a non-fully differentiated state.

Original languageEnglish (US)
Pages (from-to)8943-8948
Number of pages6
JournalJournal of Biological Chemistry
Volume267
Issue number13
StatePublished - May 5 1992
Externally publishedYes

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Calcitriol
Transforming Growth Factors
Osteosarcoma
Alkaline Phosphatase
Osteocalcin
Osteoblasts
Collagen Type I
Fibronectins
Liver
Bone
Kidney
Bone and Bones
Enzyme Induction
Level control
Enzyme activity
Cell membranes
Cell culture
Radioimmunoassay
Proteins
Cells

ASJC Scopus subject areas

  • Biochemistry

Cite this

Bonewald, L., Kester, M. B., Schwartz, Z., Swain, L. D., Khare, A., Johnson, T. L., ... Boyan, B. D. (1992). Effects of combining transforming growth factor β and 1,25-dihydroxyvitamin D3 on differentiation of a human osteosarcoma (MG-63). Journal of Biological Chemistry, 267(13), 8943-8948.

Effects of combining transforming growth factor β and 1,25-dihydroxyvitamin D3 on differentiation of a human osteosarcoma (MG-63). / Bonewald, Lynda; Kester, Mary Beth; Schwartz, Zvi; Swain, Larry D.; Khare, Aruna; Johnson, Teresa L.; Leach, Robin J.; Boyan, Barbara D.

In: Journal of Biological Chemistry, Vol. 267, No. 13, 05.05.1992, p. 8943-8948.

Research output: Contribution to journalArticle

Bonewald, L, Kester, MB, Schwartz, Z, Swain, LD, Khare, A, Johnson, TL, Leach, RJ & Boyan, BD 1992, 'Effects of combining transforming growth factor β and 1,25-dihydroxyvitamin D3 on differentiation of a human osteosarcoma (MG-63)', Journal of Biological Chemistry, vol. 267, no. 13, pp. 8943-8948.
Bonewald, Lynda ; Kester, Mary Beth ; Schwartz, Zvi ; Swain, Larry D. ; Khare, Aruna ; Johnson, Teresa L. ; Leach, Robin J. ; Boyan, Barbara D. / Effects of combining transforming growth factor β and 1,25-dihydroxyvitamin D3 on differentiation of a human osteosarcoma (MG-63). In: Journal of Biological Chemistry. 1992 ; Vol. 267, No. 13. pp. 8943-8948.
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