Human periodontal ligament cells showed time-dependent circadian gene expression after simulated orthodontic compressive force.
Evidence
Cell-culture experiment exposed primary hPDLFs to 2 g/cm² compressive force for 24 hours and measured circadian gene expression by quantitative RT-PCR at five time points.
Caveat
The findings come from an in vitro 24-hour force model with malformed abstract reporting of several gene names and statistics, not clinical orthodontic outcomes.
Simplified
BACKGROUND: Circadian genes regulate biological rhythms and are increasingly recognized for their role in bone remodeling. Periodontal ligament (PDL) cells respond dynamically to orthodontic forces, and the influence of circadian gene oscillations on this response remains unclear.
METHODS: Primary hPDLFs were cultured and exposed to a 2 g/cm² compressive force using a Flexcell FX-5000 system for 24 hours. Samples were collected at 0, 6, 12, 18, and 24 hours. Quantitative RT-PCR was used to assess circadian gene expression. GAPDH was used as a housekeeping gene. Expression levels were normalized and compared using one-way ANOVA withTukey tests. post hoc
RESULTS: andshowed significant rhythmic upregulation with peak expression at 12 hours (2.31 ± 0.41-fold;: 2.10 ± 0.36-fold;< 0.01), whileandpeaked at 18 hours (2.44 ± 0.39-fold;2.13 ± 0.33-fold;< 0.01). A strong inverse correlation was observed betweenandexpression (= -0.76,= 0.002). BMAL1CLOCK BMAL1: CLOCK P PER1CRY1PER1: CRY1: P BMAL1PER1r P
CONCLUSION: Circadian genes in PDL cells demonstrate time-dependent expression under orthodontic force, suggesting a regulatory role in and tissue remodeling. Chronotherapy could potentially optimize orthodontic outcomes by aligning force application with biological rhythms.
Key numbers
2.31 ± 0.41-fold
Peak Expression Increase of BMAL1 and CLOCK
Measured at 12 hours post-force application
2.44 ± 0.39-fold
Peak Expression Increase of PER1 and CRY1
Measured at 18 hours post-force application
-0.76
Strong Inverse Correlation
Correlation between BMAL1 and PER1 expression
Full Text
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Circadian Biology