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Bone Alkaline Phosp...
Bone Alkaline Phosphatase and Tartrate-Resistant Acid Phosphatase: Potential Co-regulators of Bone Mineralization
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- Halling Linder, Cecilia (författare)
- Linköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten,Region Östergötland, Klinisk kemi
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- Ek-Rylander, Barbro (författare)
- Karolinska Institutet,Karolinska Institute, Sweden
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- Krumpel, Michael (författare)
- Karolinska Institute, Sweden
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- Norgard, Maria (författare)
- Karolinska Institute, Sweden
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- Narisawa, Sonoko (författare)
- Sanford Childrens Health Research Centre, CA 92037 USA
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- Luis Millan, Jose (författare)
- Sanford Childrens Health Research Centre, CA 92037 USA
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- Andersson, Göran (författare)
- Karolinska Institutet,Karolinska Institute, Sweden
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- Magnusson, Per (författare)
- Linköpings universitet,Avdelningen för mikrobiologi och molekylär medicin,Medicinska fakulteten,Region Östergötland, Klinisk kemi
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(creator_code:org_t)
- 2017-03-16
- 2017
- Engelska.
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Ingår i: Calcified Tissue International. - : SPRINGER. - 0171-967X .- 1432-0827. ; 101:1, s. 92-101
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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https://link.springe...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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http://kipublication...
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Abstract
Ämnesord
Stäng
- Phosphorylated osteopontin (OPN) inhibits hydroxyapatite crystal formation and growth, and bone alkaline phosphatase (BALP) promotes extracellular mineralization via the release of inorganic phosphate from the mineralization inhibitor inorganic pyrophosphate (PPi). Tartrate-resistant acid phosphatase (TRAP), produced by osteoclasts, osteoblasts, and osteocytes, exhibits potent phosphatase activity towards OPN; however, its potential capacity as a regulator of mineralization has not previously been addressed. We compared the efficiency of BALP and TRAP towards the endogenous substrates for BALP, i.e., PPi and pyridoxal 5-phosphate (PLP), and their impact on mineralization in vitro via dephosphorylation of bovine milk OPN. TRAP showed higher phosphatase activity towards phosphorylated OPN and PPi compared to BALP, whereas the activity of TRAP and BALP towards PLP was comparable. Bovine milk OPN could be completely dephosphorylated by TRAP, liberating all its 28 phosphates, whereas BALP dephosphorylated at most 10 phosphates. OPN, dephosphorylated by either BALP or TRAP, showed a partially or completely attenuated phosphorylation-dependent inhibitory capacity, respectively, compared to native OPN on the formation of mineralized nodules. Thus, there are phosphorylations in OPN important for inhibition of mineralization that are removed by TRAP but not by BALP. In conclusion, our data indicate that both BALP and TRAP can alleviate the inhibitory effect of OPN on mineralization, suggesting a potential role for TRAP in skeletal mineralization. Further studies are warranted to explore the possible physiological relevance of TRAP in bone mineralization.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Farmakologi och toxikologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Pharmacology and Toxicology (hsv//eng)
Nyckelord
- Bone; Dephosphorylation; Hydroxyapatite; Inorganic pyrophosphate; Mineralization; Osteopontin
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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