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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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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.
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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.
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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...
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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.
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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.
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Related Experiment Video

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Systemically available bone morphogenetic protein two and seven affect bone metabolism.

Ivo Dumic-Cule1, Jelena Brkljacic, Dunja Rogic

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Systemic administration of bone morphogenetic proteins (BMPs) -2 and -7 improved bone volume in rats with low calciotropic hormones. Local BMP delivery is unlikely to cause systemic bone loss.

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Area of Science:

  • Biochemistry
  • Orthopedics
  • Endocrinology

Background:

  • Bone morphogenetic proteins (BMPs)-2 and -7 are utilized in orthopedic applications like fracture repair and spinal fusion.
  • The systemic bioavailability and skeletal effects of locally administered BMPs remain unclear.
  • A novel rat model with low calciotropic hormones was developed to investigate systemic BMP effects on bone metabolism.

Purpose of the Study:

  • To determine the effects of systemically administered BMP-2 and BMP-7 on bone metabolism in a hypocalciotropic hormonal state.
  • To assess whether local BMP administration could lead to systemic bone loss.

Main Methods:

  • Thyroid and parathyroid glands were removed (TPTx) in rats to induce low calciotropic hormone levels and bone loss.
  • Bone loss was evaluated using micro-computed tomography (micro-CT) and serum markers of bone formation and resorption.
  • In vitro studies assessed osteoblast and osteoclast activity in response to BMP-2 and BMP-7.

Main Results:

  • TPTx induced bone loss, which was reversed by systemic BMP-2 (10-70 μg/kg) and BMP-7 (10-250 μg/kg) administration.
  • BMP-2 enhanced trabecular microarchitecture, while BMP-7 increased trabecular thickness.
  • In vitro, both BMP-2 and BMP-7 increased osteoblast and osteoclast activity.

Conclusions:

  • Systemic BMP-2 and BMP-7 administration increased bone volume, even in a low calciotropic hormone environment.
  • Locally administered BMPs may have partial systemic bioavailability but are unlikely to cause systemic bone loss.