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Related Concept Videos

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...
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...
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...
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.
Essential Minerals for Bone Health01:31

Essential Minerals for Bone Health

The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...

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Related Experiment Video

Updated: Jun 20, 2026

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
08:34

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

Published on: June 3, 2016

[Adipogenesis and osteoporosis].

Juan Pablo Rodríguez1, Pablo Astudillo, Susana Ríos

  • 1Laboratorio de Biología Celular, Instituto de Nutrición y Tecnología de los Alimentos (INTA), Universidad de Chile, Santiago, Chile. jprodrig@inta.cl

Revista Medica De Chile
|September 12, 2009
PubMed
Summary
This summary is machine-generated.

Osteoporosis involves increased fat cells in bone marrow due to defects in mesenchymal stem cells (MSCs). Impaired leptin action in osteoporotic MSCs contributes to this lipid accumulation, affecting bone health.

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Area of Science:

  • Cell Biology
  • Endocrinology
  • Orthopedics

Background:

  • Mesenchymal stem cells (MSCs) differentiate into osteoblasts and adipocytes, crucial for bone homeostasis.
  • Osteoporosis is characterized by an imbalance favoring adipocyte differentiation over osteoblastogenesis.
  • Alterations in MSC number or function may underlie osteoporosis development.

Purpose of the Study:

  • To review factors influencing osteogenic and adipogenic differentiation of human bone marrow MSCs.
  • To analyze the role of local factors like estradiol and leptin in MSC differentiation in osteoporosis.
  • To investigate the altered adipogenic potential of MSCs from osteoporotic women.

Main Methods:

  • Comparative analysis of human bone marrow MSCs from control and osteoporotic postmenopausal women.
  • Assessment of osteogenic and adipogenic differentiation potential.
  • Evaluation of the effects of estradiol and leptin on MSC differentiation.

Main Results:

  • Osteoporotic MSCs (o-MSCs) exhibit a significantly higher adipogenic potential compared to control MSCs.
  • Leptin demonstrated a protective effect against adipogenesis in control MSCs.
  • Leptin's action was hampered in o-MSCs, suggesting impaired signaling in osteoporosis.

Conclusions:

  • Quantitative and qualitative defects in MSCs may contribute to osteoporosis.
  • Altered bioavailability or action of factors like leptin is implicated in the increased adipogenesis observed in osteoporosis.
  • Inadequate leptin signaling in o-MSCs may be linked to bone marrow lipid accumulation.