Increased Tartrate-Resistant Acid Phosphatase Expression in Osteoblasts and Osteocytes in Experimental Osteoporosis in Rats

Tartrate-resistant acid phosphatase (TRAP) is known as an osteoclast marker, but osteoblasts and osteocytes in the vicinity of bone remodeling sites also express TRAP. Cell culture studies suggest that osteoblasts endocytose osteoclastic TRAP for inactivation. To evaluate whether changes in osteocla...

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Veröffentlicht in:Calcified tissue international 2014-05, Vol.94 (5), p.510-521
Hauptverfasser: Solberg, Lene B., Brorson, Sverre-Henning, Stordalen, Gunhild A., Bækkevold, Espen S., Andersson, Göran, Reinholt, Finn P.
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container_end_page 521
container_issue 5
container_start_page 510
container_title Calcified tissue international
container_volume 94
creator Solberg, Lene B.
Brorson, Sverre-Henning
Stordalen, Gunhild A.
Bækkevold, Espen S.
Andersson, Göran
Reinholt, Finn P.
description Tartrate-resistant acid phosphatase (TRAP) is known as an osteoclast marker, but osteoblasts and osteocytes in the vicinity of bone remodeling sites also express TRAP. Cell culture studies suggest that osteoblasts endocytose osteoclastic TRAP for inactivation. To evaluate whether changes in osteoclast activity could alter TRAP expression in osteoblasts and/or osteocytes in vivo, we studied the ovariectomized and vitamin D-deficient rat (Ovx-D) and rats healing from rickets. Bone sections were analyzed for TRAP gene expression by in situ hybridization, TRAP protein by immunogold labeling, and TRAP enzyme activity using the fluorescent substrate ELF97. Osteoblasts and osteocytes close to intracortical remodeling sites and bone surfaces demonstrated TRAP, most prominently in cancellous bone and osteocytes. Intracellular TRAP was located to electron-dense vesicles with similar morphology in both cell types. Ovx-D increased osteoclast activity ( p  
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Cell culture studies suggest that osteoblasts endocytose osteoclastic TRAP for inactivation. To evaluate whether changes in osteoclast activity could alter TRAP expression in osteoblasts and/or osteocytes in vivo, we studied the ovariectomized and vitamin D-deficient rat (Ovx-D) and rats healing from rickets. Bone sections were analyzed for TRAP gene expression by in situ hybridization, TRAP protein by immunogold labeling, and TRAP enzyme activity using the fluorescent substrate ELF97. Osteoblasts and osteocytes close to intracortical remodeling sites and bone surfaces demonstrated TRAP, most prominently in cancellous bone and osteocytes. Intracellular TRAP was located to electron-dense vesicles with similar morphology in both cell types. Ovx-D increased osteoclast activity ( p  &lt; 0.001) and ELF97 + osteocytes ( p  &lt; 0.05) in cancellous bone, but no corresponding increase was observed in the osteocyte lacunar area. The level of TRAP + vesicles in cortical osteoblasts ( p  &lt; 0.01) in Ovx-D rats was also increased. Enhanced osteoclast activity was noted in healing rickets after 72 h ( p  &lt; 0.05), but no differences in TRAP expression were detected in osteoblasts or osteocytes. Thus, increased osteoclast activity does not affect TRAP expression in osteoblasts and osteocytes, favoring the notion that increased TRAP in these cells is rather due to increased synthesis. Although the role of TRAP in osteoblasts and osteocytes remains elusive, we speculate that the function is related to the capability of the enzyme to regulate the phosphorylation of proteins known to be expressed by these cells.</description><identifier>ISSN: 0171-967X</identifier><identifier>ISSN: 1432-0827</identifier><identifier>EISSN: 1432-0827</identifier><identifier>DOI: 10.1007/s00223-013-9834-3</identifier><identifier>PMID: 24395179</identifier><language>eng</language><publisher>Boston: Springer US</publisher><subject>Acid Phosphatase - metabolism ; Animals ; Biochemistry ; Biomedical and Life Sciences ; Bone Remodeling - physiology ; Bones ; Cell Biology ; Cell culture ; Disease Models, Animal ; Endocrinology ; Enzymes ; Female ; Fluorescent Antibody Technique ; Humans ; Immunohistochemistry ; In Situ Hybridization ; Isoenzymes - metabolism ; Life Sciences ; Medicin och hälsovetenskap ; Microscopy, Electron, Transmission ; Original Research ; Orthopedics ; Osteoblasts - enzymology ; Osteoclasts - enzymology ; Osteocytes - enzymology ; Osteoporosis, Postmenopausal - enzymology ; Proteins ; Rats ; Rickets - enzymology ; Rodents ; Tartrate-Resistant Acid Phosphatase ; Vitamin D</subject><ispartof>Calcified tissue international, 2014-05, Vol.94 (5), p.510-521</ispartof><rights>The Author(s) 2014</rights><rights>Springer Science+Business Media New York 2014</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c657t-a50f867a29db907a8611785e1f1411561f0be1c48d97c921fd18f1e7be6985fe3</citedby><cites>FETCH-LOGICAL-c657t-a50f867a29db907a8611785e1f1411561f0be1c48d97c921fd18f1e7be6985fe3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00223-013-9834-3$$EPDF$$P50$$Gspringer$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00223-013-9834-3$$EHTML$$P50$$Gspringer$$Hfree_for_read</linktohtml><link.rule.ids>230,314,552,780,784,885,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/24395179$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttp://kipublications.ki.se/Default.aspx?queryparsed=id:128681320$$DView record from Swedish Publication Index$$Hfree_for_read</backlink></links><search><creatorcontrib>Solberg, Lene B.</creatorcontrib><creatorcontrib>Brorson, Sverre-Henning</creatorcontrib><creatorcontrib>Stordalen, Gunhild A.</creatorcontrib><creatorcontrib>Bækkevold, Espen S.</creatorcontrib><creatorcontrib>Andersson, Göran</creatorcontrib><creatorcontrib>Reinholt, Finn P.</creatorcontrib><title>Increased Tartrate-Resistant Acid Phosphatase Expression in Osteoblasts and Osteocytes in Experimental Osteoporosis in Rats</title><title>Calcified tissue international</title><addtitle>Calcif Tissue Int</addtitle><addtitle>Calcif Tissue Int</addtitle><description>Tartrate-resistant acid phosphatase (TRAP) is known as an osteoclast marker, but osteoblasts and osteocytes in the vicinity of bone remodeling sites also express TRAP. Cell culture studies suggest that osteoblasts endocytose osteoclastic TRAP for inactivation. To evaluate whether changes in osteoclast activity could alter TRAP expression in osteoblasts and/or osteocytes in vivo, we studied the ovariectomized and vitamin D-deficient rat (Ovx-D) and rats healing from rickets. Bone sections were analyzed for TRAP gene expression by in situ hybridization, TRAP protein by immunogold labeling, and TRAP enzyme activity using the fluorescent substrate ELF97. Osteoblasts and osteocytes close to intracortical remodeling sites and bone surfaces demonstrated TRAP, most prominently in cancellous bone and osteocytes. Intracellular TRAP was located to electron-dense vesicles with similar morphology in both cell types. Ovx-D increased osteoclast activity ( p  &lt; 0.001) and ELF97 + osteocytes ( p  &lt; 0.05) in cancellous bone, but no corresponding increase was observed in the osteocyte lacunar area. The level of TRAP + vesicles in cortical osteoblasts ( p  &lt; 0.01) in Ovx-D rats was also increased. Enhanced osteoclast activity was noted in healing rickets after 72 h ( p  &lt; 0.05), but no differences in TRAP expression were detected in osteoblasts or osteocytes. Thus, increased osteoclast activity does not affect TRAP expression in osteoblasts and osteocytes, favoring the notion that increased TRAP in these cells is rather due to increased synthesis. 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Cell culture studies suggest that osteoblasts endocytose osteoclastic TRAP for inactivation. To evaluate whether changes in osteoclast activity could alter TRAP expression in osteoblasts and/or osteocytes in vivo, we studied the ovariectomized and vitamin D-deficient rat (Ovx-D) and rats healing from rickets. Bone sections were analyzed for TRAP gene expression by in situ hybridization, TRAP protein by immunogold labeling, and TRAP enzyme activity using the fluorescent substrate ELF97. Osteoblasts and osteocytes close to intracortical remodeling sites and bone surfaces demonstrated TRAP, most prominently in cancellous bone and osteocytes. Intracellular TRAP was located to electron-dense vesicles with similar morphology in both cell types. Ovx-D increased osteoclast activity ( p  &lt; 0.001) and ELF97 + osteocytes ( p  &lt; 0.05) in cancellous bone, but no corresponding increase was observed in the osteocyte lacunar area. The level of TRAP + vesicles in cortical osteoblasts ( p  &lt; 0.01) in Ovx-D rats was also increased. Enhanced osteoclast activity was noted in healing rickets after 72 h ( p  &lt; 0.05), but no differences in TRAP expression were detected in osteoblasts or osteocytes. Thus, increased osteoclast activity does not affect TRAP expression in osteoblasts and osteocytes, favoring the notion that increased TRAP in these cells is rather due to increased synthesis. Although the role of TRAP in osteoblasts and osteocytes remains elusive, we speculate that the function is related to the capability of the enzyme to regulate the phosphorylation of proteins known to be expressed by these cells.</abstract><cop>Boston</cop><pub>Springer US</pub><pmid>24395179</pmid><doi>10.1007/s00223-013-9834-3</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record>
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subjects Acid Phosphatase - metabolism
Animals
Biochemistry
Biomedical and Life Sciences
Bone Remodeling - physiology
Bones
Cell Biology
Cell culture
Disease Models, Animal
Endocrinology
Enzymes
Female
Fluorescent Antibody Technique
Humans
Immunohistochemistry
In Situ Hybridization
Isoenzymes - metabolism
Life Sciences
Medicin och hälsovetenskap
Microscopy, Electron, Transmission
Original Research
Orthopedics
Osteoblasts - enzymology
Osteoclasts - enzymology
Osteocytes - enzymology
Osteoporosis, Postmenopausal - enzymology
Proteins
Rats
Rickets - enzymology
Rodents
Tartrate-Resistant Acid Phosphatase
Vitamin D
title Increased Tartrate-Resistant Acid Phosphatase Expression in Osteoblasts and Osteocytes in Experimental Osteoporosis in Rats
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