Exp Clin Endocrinol Diabetes 2001; Vol. 109(2): 107-115
DOI: 10.1055/s-2001-14830
Articles

© Johann Ambrosius Barth

Analysis of TGFβ3 gene expression and protein levels in human bone and serum

S. Hering, F. Isken, J. Janott, C. Jost, A. Pommer1 , G. Muhr2 , H. Schatz, A. F. H. Pfeiffer
  • Department of Internal Medicine
  • 1 Department of Surgery, BG-Kliniken “Bergmannsheil”, Ruhr-University, Bochum
  • 2 Department of Surgery, Kliniken Barmen, Wuppertal, Germany
Further Information

Publication History

Publication Date:
31 December 2001 (online)

Summary:

Recent data indicate that TGFβ3, one member of the TGFβ-isoforms, has an important role in bone remodeling. Up to date little is known about the expression and regulation of TGFβ3 in man. We established a highly specific ELISA for quantitative measurement of TGFβ3 in bone and blood samples and a RT-PCR in combination with HPLC for detection and quantification of TGFβ3 mRNA in 89 human bone samples. Levels of TGFβ3 protein ranged between 30 and 66 pg/mg bone (mean 36,6 ± 1,03 pg/mg) and between 30 and 1910 pg/ml in serum (mean 128,9 ± 38.9 pg/ml). TGFβ3 mRNA expression as well as protein levels in serum and in bone declined age dependently. No specific load- or site-specific distribution of TGFβ3 mRNA expression or protein content was detected at different sites indicating an absence of mechanical regulation. Protein levels of TGFβ3 in serum correlated with TGFβ3 mRNA expression in bone (p = 0.0027; r = 0.49). By contrast, TGFβ3 protein levels stored in the bone matrix were not related to TGFβ3 mRNA reflecting the long term process of TGFβ3 deposition during bone remodeling. Notably TGFβ3 serum levels were highly correlated with IGF-I and osteocalcin levels in serum. We conclude that TGFβ3 in man circulates in significant amounts which appears to be representative for TGFβ3 expression in bone tissue and may be in part derived from bone. The high correlation of TGFβ3 with IGF-I suggests parallel systemic principles of regulation.

References

Dr. med. Steffen Hering

BG-Kliniken “Bergmannsheil”

Ruhr-University of Bochum

Department of Internal Medicine

Bürkle de la Camp Platz 1

D-44789 Bochum

Germany

Phone: + 49-234-302-6400

Fax: + 49-234-302-6403

Email: steffen.hering@ruhr-uni-bochum.de

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