Growth hormone and bone: a basic perspective

Area of Science:

• Endocrinology and Bone Biology
• Skeletal Physiology

Background:

• Growth hormone (GH) is crucial for childhood growth and adult skeletal homeostasis.
• GH deficiency leads to reduced bone growth and osteopenia; GH excess causes bone fragility.
• Historically, GH's skeletal effects were attributed solely to liver-produced Insulin-like Growth Factor 1 (IGF1).

Purpose of the Study:

• To review key research advancements.
• To elucidate the discovery of local GH activity within bone tissue.

Main Methods:

• Review of fundamental basic research techniques and findings.
• Analysis of studies investigating GH's direct skeletal mechanisms.

Main Results:

• Evidence demonstrates GH exerts direct effects on bone tissue.
• These local actions extend beyond the liver-IGF1 axis.
• New understanding of GH's complex role in bone metabolism.

Conclusions:

• GH possesses intrinsic bone anabolic and homeostatic functions.
• Direct GH action on bone is a significant finding, revising previous understanding.
• Further research into local GH signaling pathways is warranted.