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Bone Remodeling

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.

Osteoclasts in Bone Remodeling

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 Disorders

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...

Hormones and Bone Tissue

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...

Role of Vitamins in Maintaining Bone Health

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...

Bone Structure

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.

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Related Experiment Video

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Using Inducible Osteoblastic Lineage-Specific Stat3 Knockout Mice to Study Alveolar Bone Remodeling During Orthodontic Tooth Movement

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Published on: July 21, 2023

Serotonin: a novel bone mass controller may have implications for alveolar bone.

Carlo Galli¹, Guido Macaluso, Giovanni Passeri

¹Dep, Biomedicine, Biotechnology and Translational Sciences, University of Parma, Via Gramsci 14, Parma 43126, Italy. guidomaria.macaluso@unipr.it.

Journal of Negative Results in Biomedicine

|August 23, 2013

Summary

Selective serotonin re-uptake inhibitors (SSRIs) like Fluoxetine may impact bone loss in periodontitis. Further research is needed to explore these antidepressant drugs

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Area of Science:

Bone Biology and Periodontal Disease
Neurotransmitter Signaling and Bone Metabolism

Background:

Emerging evidence suggests alternative mechanisms regulate bone turnover, offering new therapeutic avenues for bone diseases and periodontitis.
Selective serotonin re-uptake inhibitors (SSRIs), commonly used antidepressants, have shown variable effects on bone loss in periodontitis models.
Serotonin, a neurotransmitter, plays a role in mood, gut physiology, and increasingly, bone metabolism, potentially mediating Lrp5 receptor effects on osteoblast differentiation.

Purpose of the Study:

To investigate the impact of SSRIs on bone metabolism, particularly in the context of periodontitis-induced bone loss.
To explore the potential therapeutic applications of serotonin modulators in managing periodontal disease and bone diseases.

Main Methods:

Review of existing studies on SSRIs (Fluoxetine, Venlafaxine) and their effects on bone turnover in rat models of periodontitis.
Analysis of the serotonin pathway, including its synthesis, receptors (HTR1B), and interaction with Lrp5 signaling in osteoblasts.
Examination of evidence regarding the Lrp5-serotonin axis and its controversial role in bone remodeling.

Main Results:

SSRIs can influence bone turnover, though results vary, indicating complex interactions.
Serotonin's role in bone metabolism is linked to osteoblast proliferation via HTR1B receptors, PKA, and CREB pathways.
Lrp5 signaling appears connected to serotonin synthesis, with Lrp5 deletion increasing gut serotonin production.

Conclusions:

Serotonin modulators, including SSRIs, demonstrate a significant effect on bone turnover.
The intricate relationship between serotonin signaling and bone metabolism warrants further investigation for therapeutic potential in bone diseases and periodontitis.
Thorough exploration of SSRIs' effects on periodontal physiology is crucial given their impact on bone turnover.