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. 2021 May 12;12:675385. doi: 10.3389/fendo.2021.675385

Figure 3.

Figure 3

Hypothesis of the compensatory recovery mechanism of osteoclasts. (A) Based on proapoptotic BIM and anti-apoptotic BCL-xL, an imbalance between osteoclast survival and bone resorptive capacity occurs in OP. (B) The disruption of homeostasis between the enhancement of bone resorption activity mediated by hypoxia and the inhibition of ROS on the survival of osteoclasts promotes the occurrence of osteoporosis. (C) RANKL-mediated oxidative stress results in an imbalance between osteoclast survival and bone resorption capacity. ATP, adenosine triphosphate; BCL-xL, B-cell lymphoma-extra large; BIM, BCL-2-like protein 11; HIF-1, hypoxia-induced factor-1; OP, osteoporosis; ROS, reactive oxygen species; RANKL, receptor activator of nuclear factor kappa-B ligand; SOD2, superoxide dismutase 2.