Back to Search
Start Over
WNT16 overexpression partly protects against glucocorticoid-induced bone loss.
- Source :
-
American Journal of Physiology: Endocrinology & Metabolism . Jun2018, Vol. 314 Issue 6, pE597-E604. 8p. 1 Chart, 2 Graphs. - Publication Year :
- 2018
-
Abstract
- Therapeutic use of glucocorticoids (GCs) is a major cause of secondary osteoporosis, but the molecular mechanisms responsible for the deleterious effects of GCs in bone are only partially understood. WNT16 is a crucial physiological regulator of bone mass and fracture susceptibility, and we hypothesize that disturbed WNT16 activity might be involved in the deleterious effects of GC in bone. Twelve-week-old female Obl-Wnt16 mice (WNT16 expression driven by the rat procollagen type I α1 promoter) and wild-type (WT) littermates were treated with prednisolone (7.6 mg·kg−1·day−1) or vehicle for 4 wk. We first observed that GC treatment decreased the Wnt16 mRNA levels in bone of female mice (−56.4 ± 6.1% compared with vehicle, P < 0.001). We next evaluated if WNT16 overexpression protects against GC-induced bone loss. Dual-energy X-ray absorptiometry analyses revealed that GC treatment decreased total body bone mineral density in WT mice (−3.9 ± 1.2%, P = 0.028) but not in Obl-Wnt16 mice (+1.3 ± 1.4%, nonsignificant). Microcomputed tomography analyses showed that GC treatment decreased trabecular bone volume fraction (BV/TV) of the femur in WT mice (P = 0.019) but not in Obl-Wnt16 mice. Serum levels of the bone formation marker procollagen type I N-terminal propeptide were substantially reduced by GC treatment in WT mice (−50.3 ± 7.0%, P = 0.008) but not in Obl-Wnt16 mice (−3.8 ± 21.2%, nonsignificant). However, the cortical bone thickness in femur was reduced by GC treatment in both WT mice and Obl-Wnt16 mice. In conclusion, GC treatment decreases Wnt16 mRNA levels in bone and WNT16 overexpression partly protects against GC-induced bone loss. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01931849
- Volume :
- 314
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- American Journal of Physiology: Endocrinology & Metabolism
- Publication Type :
- Academic Journal
- Accession number :
- 159064630
- Full Text :
- https://doi.org/10.1152/ajpendo.00292.2017