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Related Concept Videos

Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Bone Remodeling01:40

Bone Remodeling

Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Testosterone: Functions and Regulation01:26

Testosterone: Functions and Regulation

The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...

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Related Experiment Video

Updated: Jun 25, 2026

Estrogen-Like Effect of Bazi Bushen Capsule in Ovariectomized Rats
08:56

Estrogen-Like Effect of Bazi Bushen Capsule in Ovariectomized Rats

Published on: April 7, 2023

Elevated aromatase expression in osteoblasts leads to increased bone mass without systemic adverse effects.

Klara Sjögren1, Marie Lagerquist, Sofia Moverare-Skrtic

  • 1Center for Bone Research, Institute of Medicine, University of Gothenburg, Sahlgrenska Academy, Göteborg, Sweden.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|March 5, 2009
PubMed
Summary

Elevated aromatase in bone cells boosts bone density by converting testosterone to estrogen locally. This suggests estrogen receptor activation is more potent for bone growth than androgen receptor activation.

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Osteoclast Derivation from Mouse Bone Marrow
06:17

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Related Experiment Videos

Last Updated: Jun 25, 2026

Estrogen-Like Effect of Bazi Bushen Capsule in Ovariectomized Rats
08:56

Estrogen-Like Effect of Bazi Bushen Capsule in Ovariectomized Rats

Published on: April 7, 2023

Osteoclast Derivation from Mouse Bone Marrow
06:17

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Area of Science:

  • Bone biology
  • Endocrinology
  • Genetics

Background:

  • Testosterone (T) affects bone directly via androgen receptors (AR) or indirectly via estradiol (E2) through estrogen receptors (ERs).
  • Aromatase, the enzyme converting T to E2, has distinct promoters in bone and reproductive tissues.
  • Understanding local aromatase activity in bone is crucial for bone health research.

Purpose of the Study:

  • To investigate the effects of increased local aromatase expression in osteoblasts on bone metabolism.
  • To determine if elevated bone aromatase activity can enhance bone mineral density (BMD) and bone structure.
  • To compare the bone-anabolic effects of estrogen receptor (ER) activation versus androgen receptor (AR) activation in bone.

Main Methods:

  • Development of a transgenic mouse model (Coll-1alpha1-Arom) overexpressing human aromatase specifically in osteoblasts.
  • Analysis of serum hormone levels (T and E2), bone mineral density (BMD), and bone microarchitecture in Coll-1alpha1-Arom mice and wildtype littermates.
  • Assessment of osteoprotegerin mRNA levels and osteoclast numbers.
  • Treatment of ovariectomized mice with T to evaluate responses in Coll-1alpha1-Arom and wildtype mice.

Main Results:

  • Coll-1alpha1-Arom mice exhibited significantly increased total body, trabecular, and cortical BMD, along with greater cortical thickness.
  • Elevated osteoprotegerin mRNA levels and a reduced number of osteoclasts were observed in male Coll-1alpha1-Arom mice.
  • Testosterone treatment enhanced cortical and trabecular bone thickness in ovariectomized Coll-1alpha1-Arom mice but not in wildtype controls.
  • Serum E2 and T levels remained unaffected in the transgenic mice, indicating localized action.

Conclusions:

  • Targeted overexpression of aromatase in osteoblasts leads to estrogenic bone-anabolic effects without altering systemic hormone levels.
  • Osteoblast-specific aromatase expression promotes bone mass accrual, suggesting ER activation is more effective than AR activation for bone health.
  • This study highlights the potential of developing osteoblast-specific aromatase inducers for therapeutic interventions to improve bone health and prevent bone loss.