Our results suggest that the CD40/CD40L system plays a role in regulating BMD. Effectively, our data suggest that a decreased production of OPG could be the cause of the lower BMD observed in TT women for rs1883832 of the CD40 gene and that the degree of methylation of CpGs in the CD40 promoter could contribute to the acquisition of BMD. One possibility that deserves further study is whether the degree of methylation of the CD40 gene affects the level of CD40 expression and, consequently, the level of OPG.

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