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Tartrate-resistant acid phosphatase

About: Tartrate-resistant acid phosphatase is a research topic. Over the lifetime, 1115 publications have been published within this topic receiving 45937 citations. The topic is also known as: HPAP & SPENCDI.


Papers
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Journal ArticleDOI
TL;DR: 5-phenylnicotinic acid (CD13) was efficient as a TRAP inhibitor with Kic values in the low micromolar range towards the TR AP 5b isoform, but was not able to inhibit the TRAP 5a isoform.

16 citations

Journal Article
TL;DR: The results confirm the proinflammatory potential of adiponECTin and support the idea that adiponectin influences rheumatoid arthritis bone remodelling through alterations in osteoblast and osteoclast.
Abstract: OBJECTIVES Adiponectin is an effector molecule in the pathophysiology of rheumatoid arthritis, e.g. by inducing cytokines and matrix degrading enzymes in synovial fibroblasts. There is growing evidence that adiponectin affects osteoblasts and osteoclasts although the contribution to the aberrant bone metabolism in rheumatoid arthritis is unclear. Therefore, the adiponectin effects on rheumatoid arthritis-derived osteoblasts and osteoclasts were evaluated. METHODS Adiponectin and its receptors were examined in bone tissue. Primary human osteoblasts and osteoclasts were stimulated with adiponectin and analysed using realtime polymerase chain-reaction and immunoassays. Effects on matrix-production by osteoblasts and differentiation and resorptive activity of osteoclasts were examined. RESULTS Immunohistochemistry of rheumatoid arthritis bone tissue showed adiponectin expression in key cells of bone remodelling. Adiponectin altered gene expression and cytokine release in osteoblasts and increased IL-8 secretion by osteoclasts. Adiponectin inhibited osterix and induced osteoprotegerin mRNA in osteoblasts. In osteoclasts, MMP-9 and tartrate resistant acid phosphatase expression was increased. Accordingly, mineralisation capacity of osteoblasts decreased whereas resorptive activity of osteoclasts increased. CONCLUSIONS The results confirm the proinflammatory potential of adiponectin and support the idea that adiponectin influences rheumatoid arthritis bone remodelling through alterations in osteoblast and osteoclast.

16 citations

Journal Article
Nuthmann1, Dirks W, Drexler Hg
01 Dec 1993-Leukemia
TL;DR: The insertion of a human TRAP cDNA into mammalian expression vector pSBC-2 yielded a construct that encoded enzymatically active TRAP in transfected baby hamster kidney cells (BHK-21), indicating the existence of a functional endogenous phosphorylation network.
Abstract: Tartrate-resistant acid phosphatase (TRAP) became known as the characteristic, albeit not specific, marker enzyme for hairy cell leukemia (HCL). It is also expressed in other types of leukemic cells and in a variety of normal hematopoietic cells under both physiological and artificial conditions. The role of this distinctive enzyme is still unknown. TRAP hydrolyzes several chemical compounds, but its physiological substrate remains to be elucidated. Here, the insertion of a human TRAP cDNA into mammalian expression vector pSBC-2 yielded a construct that encoded enzymatically active TRAP in transfected baby hamster kidney cells (BHK-21). TRAP was expressed transiently, as shown by Northern blot analysis, polyacrylamide gel electrophoresis, isoelectric focusing and cytochemical staining. BHK-21 cells over-expressing the enzyme had a growth rate that was approximately 50% of that observed in control cells. A stable expression could not be achieved. Recent evidence suggested that TRAP might function as a protein tyrosine phosphatase. The effect of TRAP on protein tyrosine phosphorylation was examined by immunoblotting with an anti-phosphotyrosine monoclonal antibody (MoAb). The level of tyrosine phosphorylation was clearly lower in transfected BHK-21-TRAP cells than in the control cultures. Phorbol ester-mediated induction of protein tyrosine phosphorylation could overcome the status of reduced phosphorylation in BHK-21-TRAP cells. Furthermore, upon treatment with 12-O-tetra-decanoylphorphol-13-acetate tyrosine phosphorylation reached similar levels to stimulated control cells, indicating the existence of a functional endogenous phosphorylation network. Thus, TRAP might function as an antagonistic counterpart of cellular protein tyrosine kinases and could be involved in the control of cellular activation, proliferation, and differentiation.

16 citations

Book ChapterDOI
TL;DR: It is hypothesized that in addition to cytokines, components of the bone matrix and specific cell surface receptors on osteoclasts and their precursors play an essential role in determining the genetic profile and functional properties of fully differentiated resorbing osteoclast.
Abstract: Osteoclast and their mononuclear cell precursors are present within the bone microenvironment at sites of physiologic and pathologic bone resorption. Analysis of tissues from sites of bone resorption reveal that cells expressing the full morphological and functional properties of mature osteoclasts are restricted to the immediate bone surface. We hypothesize that in addition to cytokines, components of the bone matrix and specific cell surface receptors on osteoclasts and their precursors play an essential role in determining the genetic profile and functional properties of fully differentiated resorbing osteoclasts. We have employed expression profiling, with an in vitro model of matrix-dependent osteoclast differentiation, to identify the molecular pathways by which bone matrix-interactions induce terminal osteoclast differentiation and activation. In preliminary studies, we have identified unique genes and transcriptional pathways that are induced by interaction of osteoclast precursors with specific components of the mineralized bone matrix. The authenticity of the gene profiles, as markers of osteoclast differentiation and activation, have been provisionally validated using an in vivo animal bone implantation model and by examination of tissues from patients with specific forms of pathologic osteoclast-mediated bone resorption. The ultimate goal of our studies is to identify new molecular targets for inhibiting osteoclast-mediated bone loss in disorders of pathologic bone loss. The early work of Walker et al. (Walker 1972) in parabiotic animals, and the subsequent studies of Burger et al. (Burger, Van der Meer, van de Gevel, et al. 1982) using a co-culture model with fetal bone rudiments and bone marrow-derived cells, have helped to establish that osteoclasts are derived from macrophage precursors of colony forming unit-macrophage (CFU-M lineage). As such, they share a common hematopoietic origin with other CFU-M lineage cells, including tissue macrophages that populate the lung (alveolar macrophages), liver (Kupfer cells), synovium (synovial macrophages) and other organs. They also share a common lineage

16 citations

Journal ArticleDOI
TL;DR: When antibody was coupled with acid phosphatase, the enzymatic activity was markedly stabilized against pH and temperature degradation, and under these circumstances slight stability occurred when antibody was bound to Sepharose, and then acidosphatase added to the gel antibody complex.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202238
202126
202025
201913
201821