Calcium in osteoblast-enriched bone cells

K ImaiS Saito


The exchangeability, location, and amount of the total calcium in bone cells were studied in relation to their osteoblastic activity. Cells were isolated from neonatal rat calvariae by sequential collagenase digestion and incubated with 45Ca2+ before or after various treatments. 45Ca2+, 40Ca2+, and DNA were determined on each cell sample. Long-term experiments were performed on cultured cells. The cells closest to the forming bone had the highest alkaline phosphatase activity and the highest Ca2+ content (i.e., 17 mm Ca2+/l cell water, as compared to soft tissue cells, which have 2-3 mm Ca2+/l (Borle 1981). About 50% of this Ca2+ exchanges readily with 45Ca2+ and appears to be located almost entirely in the cell membrane. Thirty-five percent exchanges only slowly with a t1/2 of 27 hours, and is located within the cell, principally in the mitochondria as seen in pyroantimonate fixed cells (Neuman et al. 1985). In spite of its slow exchange-ability, this Ca2+ fraction can be mobilized or augmented rapidly when Ca2+ supply is reduced or increased in vitro or in vivo. 1,25(OH)2D3 given in vivo increased this intracellular Ca2+ when the Ca2+ supply was low and released it when the Ca2+ supply was high. About 15% of the Ca2+ in these...Continue Reading


Nov 10, 1978·Calcified Tissue Research·R M Dziak
Jul 1, 1975·Analytical Biochemistry·K C Reed, F L Bygrave
Jan 1, 1989·Connective Tissue Research·K YoonG A Rodan
Aug 1, 1974·Journal of Cellular Physiology·R M Dziak, J S Brand
Aug 1, 1974·Journal of Cellular Physiology·R M Dziak, J S Brand
Jan 1, 1970·Calcified Tissue Research·J L MatthewsJ H Roan
Jan 1, 1984·Metabolic Bone Disease & Related Research·I M Shapiro, A Boyde


Oct 23, 1997·Journal of Inorganic Biochemistry·F A LeoneJ M Pizauro
Sep 29, 2006·Journal of Cellular Biochemistry·Ray SaundersChristopher S Adams
Apr 12, 2008·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Marcus JägerRüdiger Krauspe

Related Concepts

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Spatio-Temporal Regulation of DNA Repair

DNA repair is a complex process regulated by several different classes of enzymes, including ligases, endonucleases, and polymerases. This feed focuses on the spatial and temporal regulation that accompanies DNA damage signaling and repair enzymes and processes.

Glut1 Deficiency

Glut1 deficiency, an autosomal dominant, genetic metabolic disorder associated with a deficiency of GLUT1, the protein that transports glucose across the blood brain barrier, is characterized by mental and motor developmental delays and infantile seizures. Follow the latest research on Glut1 deficiency with this feed.

Hereditary Sensory Autonomic Neuropathy

Hereditary Sensory Autonomic Neuropathies are a group of inherited neurodegenerative disorders characterized clinically by loss of sensation and autonomic dysfunction. Here is the latest research on these neuropathies.

Separation Anxiety

Separation anxiety is a type of anxiety disorder that involves excessive distress and anxiety with separation. This may include separation from places or people to which they have a strong emotional connection with. It often affects children more than adults. Here is the latest research on separation anxiety.

Neural Activity: Imaging

Imaging of neural activity in vivo has developed rapidly recently with the advancement of fluorescence microscopy, including new applications using miniaturized microscopes (miniscopes). This feed follows the progress in this growing field.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.