(a – f), Total body (a and d), lumber spinal (b and e) and femoral (c and f) bone mineral density (BMD) of WT, D5−/−, Apoe−/− and Apoe−/−;D5−/− mice (n = 7 – 10 per group) fed a high-fat diet (HFD) for either 12 or 18 weeks. (g – l), Expression of mRNA transcripts of Rankl (g–i) and Opg (j–l) in tibiae, spleen and thymus of WT, D5−/−, Apoe−/− and Apoe−/−;D5−/− mice (n = 7 – 10 per group) fed the HFD for 18 weeks, assessed by qRT-PCR and normalized to β-actin. Values represent mean ± s.e.m. *P < 0.05 versus WT, #P < 0.05 versus Apoe−/−, calculated by one-way ANOVA.