Related Experiment Video
Updated: Jul 4, 2026
08:52
Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
Published on: March 18, 2022
Aromatase expression in osteoarthritic and osteoporotic bone
José L Hernández1, Carlos M Garcés, Manuel Sumillera
1Hospital UM Valdecilla-IFIMAV, University of Cantabria, Santander, Spain.
Arthritis and Rheumatism
|June 3, 2008
Summary
Aromatase, an enzyme crucial for estrogen production, is expressed in bone. Osteoarthritis patients show lower aromatase expression in bone tissue and osteoblasts compared to hip fracture patients, suggesting a link to osteoarthritis development.
Area of Science:
- Endocrinology
- Bone Biology
- Osteoarthritis Pathophysiology
Background:
- Estrogen deficiency is linked to osteoporosis and potentially osteoarthritis.
- Aromatase converts androgens to estrogens, a key source in postmenopausal women.
- Aromatase's role in bone is debated, prompting this investigation.
Purpose of the Study:
- To quantify aromatase expression in bone samples from patients with hip fracture and osteoarthritis.
- To investigate aromatase expression in osteoblast cultures from these patient groups.
Main Methods:
- Real-time reverse transcriptase-polymerase chain reaction was used to measure aromatase RNA.
- Trabecular bone samples from the femoral neck were analyzed.
- Primary osteoblast cultures from 62 patients were examined.
Main Results:
- Aromatase RNA was detected in bone at levels comparable to adipose tissue.
- Osteoarthritis patients exhibited significantly lower aromatase transcript levels in bone tissue versus hip fracture patients (P=0.00001).
- Osteoblast cultures from osteoarthritis patients showed reduced aromatase expression compared to fracture patients (P=0.012).
Conclusions:
- Bone tissue expresses high levels of aromatase, similar to adipose tissue.
- Reduced aromatase expression in osteoarthritis patients may contribute to disease development.
- Lower estrogen synthesis due to decreased aromatase could impact cartilage health.
Related Concept Videos
01:29Bone 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 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...
01:31Osteoclasts 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...
01:40Bone 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.