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Am J Physiol Endocrinol Metab 277: E496-E504, 1999;
0193-1849/99 $5.00
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Vol. 277, Issue 3, E496-E504, September 1999

EPILOGUE
Triiodothyronine induces collagenase-3 and gelatinase B expression in murine osteoblasts

Renata C. Pereira1,3, Vanda Jorgetti3, and Ernesto Canalis1,2

1 Departments of Research and Medicine, Saint Francis Hospital and Medical Center, Hartford 06105; 2 University of Connecticut School of Medicine, Farmington, Connecticut 06030; and 3 Laboratorio de Fisiopatologia Renal, Universidade de Sao Paulo, Sao Paulo, Brazil 01246-903

Triiodothyronine (T3) increases bone resorption, but its effects on matrix metalloprotease (MMP) expression in bone are unknown. We tested the effects of T3 on collagenase-3 and gelatinase A and B expression in MC3T3 osteoblastic cells. T3 at 1 nM to 1 µM for 24-72 h increased collagenase-3 and gelatinase B mRNA levels, but it did not increase gelatinase A transcripts. In addition, T3 increased immunoreactive collagenase and gelatinase activity. Cycloheximide prevented the stimulatory effect of T3 on collagenase-3 but not on gelatinase B transcripts. Indomethacin did not prevent the effect of T3 on either MMP. T3 did not alter the decay of collagenase-3 or gelatinase B mRNA in transcriptionally arrested MC3T3 cells, and it increased the rate of collagenase-3 and gelatinase B gene transcription. Although T3 enhanced the expression of the tissue inhibitor of metalloproteinase-1 in MC3T3 cells, it increased collagen degradation in cultured intact rat calvariae. In conclusion, T3 increases collagenase-3 and gelatinase B synthesis in osteoblasts by transcriptional mechanisms. This effect may contribute to the actions of T3 on bone matrix remodeling.

bone remodeling; thyroid hormone; metalloprotease; collagen degradation


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