Group 8
Why Estrogen Matters
Estrogen plays a key role in keeping bones strong. This is becomes especially clear after menopause, when estrogen levels drop and the risk of osteoporosis rises significantly.
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What Happens When Estrogen Drops
At menopause, bone remodelling speeds up, but not in a balanced way. Bone is broken down faster than it is rebuilt, leading to gradual bone loss.
Lower estrogen levels are directly linked to:
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Increased Bone Breakdown
Higher Bone Turnover
Greater Risk of Fractures
How estrogen protects bone
Estrogen helps maintain healthy bones by:
1. Slowing down osteoclast formation and activity
2. Promoting osteoclast cell death
3. Reducing inflammatory signals that drive bone loss (like IL-1, IL-6, TNF-α
Without estrogen, these protective factors are lost, and bone marrow breakdown accelerates.
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Beyond Women: Estrogen in Both Sexes
Although often associated with women, estrogen is essential for bone health in everyone:
Puberty
Helps bones grow maturely and properly
Adults
Regulates ongoing bone turnover
Men
low estrogen is more strongly linked to osteoporosis than low testosterone
Cellular and Immune Effects
Estrogen works at multiple levels in the body:
1. Acts directly on bone cells (osteoclasts and their precursors)
2. Signals through estrogen receptor α (ERα), which influences bone density and fracture risk.
3. Regulates immune cells in bone marrow
When estrogen is low, immune cells become more active, increasing inflammatory signals that stimulate bone breakdown.
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