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Cementum‐Forming Cells Are Phenotypically Distinct from Bone‐Forming Cells
Author(s) -
Grzesik Wojciech J.,
Cheng Hui,
Oh Julia S.,
Kuznetsov Sergei A.,
Mankani Mahesh H.,
Uzawa Katsuhiro,
Robey Pamela Gehron,
Yamauchi Mitsuo
Publication year - 2000
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1359/jbmr.2000.15.1.52
Subject(s) - cementum , stromal cell , matrix (chemical analysis) , cementogenesis , bone marrow , chemistry , bone cell , microbiology and biotechnology , demineralized bone matrix , pathology , materials science , biology , medicine , dentin , chromatography , amplifier , dbm , optoelectronics , cmos
Normal human cementum‐derived cells (HCDCs), expanded in vitro, formed mineralized matrix when attached to a ceramic carrier and transplanted subcutaneously into immunodeficient mice. The mineralized matrix elaborated by transplanted HCDC exhibited several features identical to cementum in situ and was significantly different from bone deposited by similarly transplanted human bone marrow stromal cells (BMSCs). No bone marrow formation and very few or no tartrate‐resistant acid phosphatase (TRAP)‐positive cells (osteoclasts and osteoclastic precursors) were found in HCDC transplants. In contrast, in BMSC transplants both hematopoiesis and TRAP‐positive cells were routinely observed. Furthermore, compared with BMSC‐derived matrix, HCDC‐derived matrix was less cellular, numerous empty lacunae were present, and fewer cells were found on the cementum matrix/ceramic carrier interface. The organization of collagen fibers in HCDC‐derived matrix, as visualized by using the Picrosirus red staining method, was similar to cementum, with typical unorganized bundles of collagen fibers. In contrast, bone matrix elaborated by transplanted BMSC had lamellar structure, identical to mature bone in situ. Finally, cementocytes embedded in the cementum‐like matrix were immunopositive for fibromodulin and lumican, whereas osteocytes within the bonelike matrix were negative. This pattern is consistent with the cementum and bone in situ, respectively. These results indicate that human cementum cells are phenotypically distinct from bone cells and provide further validation of the combined in vitro/in vivo model of human cementogenesis recently developed in our laboratory.