In vitro proliferation and osteoblastic phenotype expression of cells derived from human vertebral lamina and iliac crest.
METHODS
Osteoblastic cells derived from vertebral lamina and iliac crest were isolated and cultured under the same conditions (osteogenic medium, pH, temperature, and CO2 levels).


OBJECTIVE
To compare proliferation and expression of osteoblastic phenotype of cells derived from vertebral lamina and iliac grafting.


BACKGROUND
Many factors play a role in the success of bone graft in spinal fusion including osteoblastic cell population. Two common sources of graft are vertebral lamina and iliac crest, however, differences in proliferation and osteoblastic phenotype expression between cells from these sites have not been investigated.


METHODS
Cells obtained from cancellous bone of both vertebral lamina and iliac crest were cultured and proliferation was evaluated by direct cell counting and viability detected by Trypan blue. Alkaline phosphatase (ALP) activity was evaluated by thymolphthalein release from thymolphthalein monophosphate and matrix mineralization by staining with alizarin red S. Gene expression of ALP, osteocalcin, runt-related transcription factor 2, Msh homeobox 2, bone morphogenetic protein 7, intercellular adhesion molecule 1 precursor, osteoprotegerin, and receptor activator of NF-kB ligand was analyzed by real-time PCR. All comparisons were donor-matched.


RESULTS
Proliferation was greater at days 7 and 10 in cells from vertebral lamina compared with ones from iliac crest without difference in cell viability. ALP activity was higher in cells from vertebral lamina compared with cells from iliac crest at days 7 and 10. At 21 days, mineralized matrix was higher in cells derived from vertebral lamina than from iliac crest. At day 7, gene expression of ALP, osteocalcin, runt-related transcription factor 2, Msh homeobox 2, bone morphogenetic protein 7, intercellular adhesion molecule 1 precursor, receptor activator of NF-kB ligand, and osteoprotegerin was higher in cells derived from vertebral lamina compared with iliac crest.


CONCLUSIONS
Cell proliferation and osteoblastic phenotype development in cells derived from cancellous bone were more exuberant in cultures of vertebral lamina than of iliac crest.
Defino
Helton L A
HL
Department of Biomechanics, Rehabilitation, and Medicine of the Locomotor Apparatus, University of São Paulo, Brazil.
da Silva Herrero
Carlos F P
CF
Crippa
Grasiele E
GE
Bellesini
Larissa Sverzut
LS
Beloti
Marcio M
MM
Rosa
Adalberto L
AL
D015415:Biomarkers / Q000032:analysis / Q000378:metabolism; D001857:Bone Matrix / Q000737:chemistry / Q000378:metabolism; D001861:Bone Regeneration / Q000502:physiology; D016025:Bone Transplantation / Q000379:methods; D002113:Calcification, Physiologic / Q000502:physiology; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000502:physiology*; D049109:Cell Proliferation; D002478:Cells, Cultured; D005786:Gene Expression Regulation / Q000502:physiology; D006801:Humans; D007085:Ilium / Q000166:cytology* / Q000502:physiology; D010006:Osteoblasts / Q000166:cytology* / Q000502:physiology; D010012:Osteogenesis / Q000502:physiology; D010641:Phenotype; D013123:Spinal Fusion / Q000379:methods; D013131:Spine / Q000166:cytology* / Q000502:physiology
D015415:Biomarkers