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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...

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 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.

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...

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...

Skeleton and Calcium Homeostasis

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.

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Related Experiment Videos

Ghrelin, another factor affecting bone metabolism.

Dimitrios Nikolopoulos¹, Stamatios Theocharis, Gregory Kouraklis

¹2nd Department of Propedeutic Surgery, University of Athens, Medical School, Laiko General Hospital, Athens, Greece. drdnikol@hotmail.com

Medical Science Monitor : International Medical Journal of Experimental and Clinical Research

|June 29, 2010

Summary

Ghrelin, a stomach peptide, influences bone and cartilage metabolism independently of growth hormone. This review explores ghrelin

Related Experiment Videos

Area of Science:

Endocrinology
Bone Biology
Metabolism

Background:

Ghrelin is a 28-amino acid peptide hormone produced primarily in the stomach.
It acts as an endogenous ligand for the growth hormone secretagogue receptor (GHS-R).
Ghrelin influences various physiological processes, including appetite, energy homeostasis, and growth hormone release.

Purpose of the Study:

To review the multifaceted effects of ghrelin on bone and cartilage metabolism.
To analyze the direct and indirect mechanisms by which ghrelin interacts with bone cells.
To discuss the potential clinical implications of ghrelin in bone-related conditions.

Main Methods:

This review synthesizes existing research on ghrelin's role in skeletal tissues.
It examines studies investigating ghrelin's impact on osteoblasts, chondrocytes, and bone repair.
Literature search focused on ghrelin's autocrine/paracrine actions in bone and cartilage.

Main Results:

Ghrelin directly stimulates osteoblast proliferation and inhibits apoptosis.
Ghrelin expression in cartilage suggests a role as a chondrocyte growth factor.
Ghrelin promotes osteogenesis and enhances bone defect repair in vivo.
Ghrelin inhibits prostaglandin and leukotriene synthesis, impacting inflammation.

Conclusions:

Ghrelin plays a significant role in regulating bone and cartilage metabolism through direct actions on skeletal cells.
Its effects on osteogenesis, chondrogenesis, and bone repair highlight its potential as a therapeutic target.
Further research into ghrelin's clinical applications for bone disorders is warranted.