| First Author | Fossmark R | Year | 2012 |
| Journal | J Cell Biochem | Volume | 113 |
| Issue | 1 | Pages | 141-7 |
| PubMed ID | 21882222 | Mgi Jnum | J:307269 |
| Mgi Id | MGI:6708202 | Doi | 10.1002/jcb.23337 |
| Citation | Fossmark R, et al. (2012) Decreased bone mineral density and reduced bone quality in H(+) /K(+) ATPase beta-subunit deficient mice. J Cell Biochem 113(1):141-7 |
| abstractText | Proton pump inhibitors (PPIs) are widely used against gastroesophageal reflux disease. Recent epidemiological studies suggest that PPI users have an increased risk of fractures, but a causal relationship has been questioned. We have therefore investigated the skeletal phenotype in H(+) /K(+) ATPase beta-subunit knockout (KO) female mice. Skeletal parameters were determined in 6- and 20-month-old KO mice and in wild-type controls (WT). Whole body bone mineral density (BMD) and bone mineral content (BMC) were measured by dual energy X-ray absorptiometry (DXA). Femurs were examined with microCT analyses and break force were examined by a three-point bending test. Plasma levels of gastrin, RANKL, OPG, osteocalcin, leptin, and PTH were analyzed. KO mice had lower whole body BMC at 6 months (0.53 vs. 0.59 g, P = 0.035) and at 20 months (0.49 vs. 0.74 g, P < 0.01) compared to WT as well as lower BMD at 6 months (0.068 vs. 0.072 g/cm(2) , P = 0.026) and 20 months (0.067 vs. 0.077 g/cm(2) , P < 0.01). Mechanical strength was lower in KO mice at the age of 20 months (6.7 vs. 17.9 N, P < 0.01). Cortical thickness at 20 months and trabecular bone volume% at 6 months were significantly reduced in KO mice. Plasma OPG/RANKL ratio and PTH was increased in KO mice compared to controls. H(+) /K(+) ATPase beta subunit KO mice had decreased BMC and BMD, reduced cortical thickness and inferior mechanical bone strength. Whereas the mechanism is uncertain, these findings suggest a causal relationship between long-term PPI use and an increased risk of fractures. |
