Liver X receptors and skeleton: Current state-of-knowledge

Area of Science:

• Molecular biology
• Endocrinology
• Bone biology

Background:

• Liver X receptors (LXR) are nuclear receptors critical for lipid homeostasis and inflammation.
• Emerging research indicates LXR's significant role in regulating bone remodeling.
• The precise molecular mechanisms of LXR's skeletal actions and its link to osteoporosis remain unclear.

Purpose of the Study:

• To review the molecular pathways through which LXR influences skeletal homeostasis.
• To elucidate the role of LXR in bone remodeling and osteoporosis.
• To highlight the therapeutic potential of targeting LXR for bone health.

Main Methods:

• Literature review of studies on LXR and skeletal regulation.
• Analysis of molecular pathways involving LXR, estrogen, PTH, PPARγ, RXR, hedgehog, and Wnt signaling.
• Examination of LXR's regulation of osteoclastogenesis and bone resorption markers.

Main Results:

• LXR, in conjunction with other signaling pathways, modulates osteoclastogenesis and bone resorption.
• LXR influences the expression of key factors (c-Fos, NFATc1, NF-κB) in RANKL-induced osteoclast differentiation.
• Synthetic LXR ligands demonstrate potential in suppressing RANKL-induced osteoclast differentiation.

Conclusions:

• LXR is a key regulator of skeletal homeostasis through various molecular interactions.
• Targeting LXR presents a promising therapeutic avenue for preventing and treating osteoporosis.
• Modulating LXR activity can potentially improve overall bone quality.