Expression and localization of bone morphogenetic proteins (BMPs) and BMP receptors in ossification of the ligamentum flavum.
To clarify the pathogenesis of ossification of the ligamentum flavum (OLF), we examined the expression and localization of bone morphogenetic proteins (BMPs) and their receptors (BMPRs) in the ligamentum flavum of the patients with OLF by immunohistochemical staining and compared them with staining patterns in control patients. The BMPRs appeared extensively in mature and immature chondrocytes around the calcified zone and in spindle-shaped cells and round cells in the remote part from ossified foci in examined tissue of OLF. The ligands for BMPRs, BMP-2/-4 and osteogenic protein-1 (OP-1)/BMP-7, colocalized in OLF patients. In the control cases, expression of BMPs and BMPRs was observed around the calcified zone at the insertion of the ligamentum flavum to the bone, and limited expression was found in the smaller range. Thus, the expression profile of BMPs and BMPRs in OLF patients was entirely different from the control patients, suggesting that BMPs may be involved in promoting endochondral ossification at ectopic ossification sites in OLF, and that ossification activity is continuous in these patients.
Hayashi
K
K
Department of Orthopaedic Surgery, Faculty of Medicine, Kagoshima University, Japan.
Ishidou
Y
Y
Yonemori
K
K
Nagamine
T
T
Origuchi
N
N
Maeda
S
S
Imamura
T
T
Kato
M
M
Yoshida
H
H
Sampath
T K
TK
ten Dijke
P
P
Sakou
T
T
D029404:Activin Receptors; D000328:Adult; D000368:Aged; D055396:Bone Morphogenetic Protein 2; D055415:Bone Morphogenetic Protein 4; D055419:Bone Morphogenetic Protein 7; D052004:Bone Morphogenetic Protein Receptors; D019485:Bone Morphogenetic Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D002114:Calcinosis / Q000235:genetics* / Q000378:metabolism; D002356:Cartilage / Q000166:cytology / Q000378:metabolism; D048429:Cell Size / Q000502:physiology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D017843:Ligamentum Flavum / Q000378:metabolism* / Q000473:pathology / Q000502:physiology; D008297:Male; D008875:Middle Aged; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D011869:Radioligand Assay; D011956:Receptors, Cell Surface / Q000378:metabolism*; D017978:Receptors, Growth Factor / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000378:metabolism
C525718:BMP2 protein, human; C525809:BMP4 protein, human; C525819:BMP7 protein, human; D055396:Bone Morphogenetic Protein 2; D055415:Bone Morphogenetic Protein 4; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D011956:Receptors, Cell Surface; D017978:Receptors, Growth Factor; D016212:Transforming Growth Factor beta; D017346:Protein Serine-Threonine Kinases; D029404:Activin Receptors; D052004:Bone Morphogenetic Protein Receptors