Related Experiment Video
Updated: Jul 16, 2026
05:25
Using Inducible Osteoblastic Lineage-Specific Stat3 Knockout Mice to Study Alveolar Bone Remodeling During Orthodontic Tooth Movement
Published on: July 21, 2023
Unbalanced bone turnover in children with beta-thalassemia
Osama S Salama1, Youssef A Al-Tonbary, Rania A Shahin
1Clinical Pathology Department, Mansoura University, Mansoura, Egypt.
Hematology (Amsterdam, Netherlands)
|February 28, 2007
Summary
Patients with beta-thalassemia show impaired bone formation, evidenced by lower osteocalcin levels. This suggests an imbalance in bone turnover, contributing to skeletal complications like osteoporosis in these individuals.
Area of Science:
- Hematology
- Pediatric Endocrinology
- Biochemistry
Background:
- Beta-thalassemia treatment advances have improved life expectancy but increased skeletal complications like osteopenia and osteoporosis.
- The pathogenesis of these bone disorders is multifactorial, involving hormonal deficiencies, nutritional status, bone marrow expansion, iron overload, and chelation therapy toxicity.
- Assessing bone turnover non-invasively is crucial, with bone formation markers showing promise.
Purpose of the Study:
- To evaluate the utility of bone formation markers in assessing skeletal health in pediatric patients with beta-thalassemia.
- To investigate the relationship between bone turnover markers and the complications of beta-thalassemia.
Main Methods:
- A study involving 36 pediatric patients (ages 3-18) with beta-thalassemia and 20 age/sex-matched healthy controls.
- Clinical evaluation, radiological assessment, and laboratory tests including complete blood count, iron studies, serum calcium, serum phosphorus, alkaline phosphatase, and osteocalcin.
- Statistical analysis to compare marker levels between thalassemic patients and controls.
Main Results:
- Serum phosphorus levels were significantly higher in thalassemic patients (p=0.002), potentially indicating hypoparathyroidism.
- Serum alkaline phosphatase levels were slightly elevated but not statistically significant (p=0.055), possibly due to co-existing liver disease.
- Osteocalcin levels were significantly lower in thalassemic patients compared to controls (p=0.011), suggesting impaired bone formation potentially due to iron overload toxicity.
Conclusions:
- Thalassemic patients exhibit an imbalance in bone turnover, characterized by non-significant or decreased bone formation markers.
- Significantly lower osteocalcin levels in patients point towards impaired osteoblast function, likely exacerbated by iron overload.
- These findings highlight the importance of monitoring bone health and exploring therapeutic strategies to address bone turnover abnormalities in beta-thalassemia.
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...
01:40Bone 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.
01:09Changes in the Appendicular Skeleton with Age
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
01:24Bone Formation by Endochondral Ossification
Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
01:17Hormones 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...
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...
01:29Bone Formation by Intramembranous Ossification
Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...