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2015 ; 5
(ä): 12529
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Time-lapse Raman imaging of osteoblast differentiation
#MMPMID26211729
Hashimoto A
; Yamaguchi Y
; Chiu LD
; Morimoto C
; Fujita K
; Takedachi M
; Kawata S
; Murakami S
; Tamiya E
Sci Rep
2015[Jul]; 5
(ä): 12529
PMID26211729
show ga
Osteoblastic mineralization occurs during the early stages of bone formation.
During this mineralization, hydroxyapatite (HA), a major component of bone, is
synthesized, generating hard tissue. Many of the mechanisms driving
biomineralization remain unclear because the traditional biochemical assays used
to investigate them are destructive techniques incompatible with viable cells. To
determine the temporal changes in mineralization-related biomolecules at
mineralization spots, we performed time-lapse Raman imaging of mouse osteoblasts
at a subcellular resolution throughout the mineralization process. Raman imaging
enabled us to analyze the dynamics of the related biomolecules at mineralization
spots throughout the entire process of mineralization. Here, we stimulated
KUSA-A1 cells to differentiate into osteoblasts and conducted time-lapse Raman
imaging on them every 4?hours for 24?hours, beginning 5 days after the
stimulation. The HA and cytochrome c Raman bands were used as markers for
osteoblastic mineralization and apoptosis. From the Raman images successfully
acquired throughout the mineralization process, we found that ?-carotene acts as
a biomarker that indicates the initiation of osteoblastic mineralization. A
fluctuation of cytochrome c concentration, which indicates cell apoptosis, was
also observed during mineralization. We expect time-lapse Raman imaging to help
us to further elucidate osteoblastic mineralization mechanisms that have
previously been unobservable.