nism by which Liuwei dihuang pill promotes tendon-bone healing by regulating the interaction between bone marrow mesenchymal stem cells (BMSCs) and macrophages through Wnt/
β
-catenin pathway.
METHODS
2
BMSCs were co-cultured with macrophages at a ratio of 1∶4 and divided into control group, 10% drug-containing serum group, 20% drug-containing serum group, Wnt/
β
-catenin pathway inhibitor Dickkopf-related protein 1 (DKK-1) group, and 20% drug-containing serum+DKK-1 group. After 48 hours of cell co-culture and 14 days of osteogenic induction, the CD86 and CD206 positive cell rates in macrophages, the proportion of calcium nodule positive staining area in BMSCs, the levels of osteocalcin (OCN) and oncostatin M (OSM) and alkaline phosphatase (ALP) activity in cell supernatant, as well as the mRNA and protein expression levels of OCN, Runt-related transcription factor 2 (RUNX2), OSM, low-density lipoprotein receptor-related protein 5 (LRP5),
β
-catenin in cells were detected. Pearson correlation analysis was performed to assess the correlation between LRP5 and
β
-catenin protein expression with OCN, RUNX2, OSM protein expression, and CD206 positive cell rate, respectively.
RESULTS
2
Compared with the control group, the CD86 positive cell rates in the 10% drug-containing serum group and the 20% drug-containing serum group were significantly reduced, while the CD206 positive cell rate, proportion of calcium nodule positive staining area, OCN level, OSM level, ALP activity, and mRNA and protein expression levels of OCN, RUNX2, OSM, LRP5,
β
-catenin were significantly increased (
P
<0.05). Compared with the 20% drug-containing serum group, the changes in the above indicators in the 20% drug-containing serum+DKK-1 group were significantly reversed (
P
<0.05). The protein expression of LRP5 and
β
-catenin was positively correlated with the pro
tein expression of OCN, RUNX2, OSM, and CD206 positive cell rate.
CONCLUSIONS
2
Liuwei dihuang pill can activate the Wnt/
β
-catenin pathway, induce M2 polarization of macrophages and secretion of OSM, promote osteogenic differentiation and matrix mineralization of BMSCs, and synergistically promote tendon-bone healing.
关键词
Keywords
references
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