Chinese Journal of Tissue Engineering Research ›› 2020, Vol. 24 ›› Issue (26): 4146-4151.doi: 10.3969/j.issn.2095-4344.2759

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Grape seed proanthocyanidins antagonize osteocyte apoptosis due to steroid-induced osteonecrosis of the femoral head

Zhang Zhifeng1, Wei Jing2, Sun Tao3, Song Jinling4, Zhao Zhenqun5, Huang Jian1   

  1. 1Department of Joint Surgery, 2First Department of Hand and Foot Micro-surgery, 3Department of Emergency, 4Department of Imaging, 5Department of Pediatric Orthopedics, Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010030, Inner Mongolia Autonomous Region, China

  • Received:2019-08-10 Revised:2019-08-14 Accepted:2019-10-19 Online:2020-09-18 Published:2020-09-01
  • Contact: Huang Jian, MD, Chief physician, Department of Joint Surgery, Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010030, Inner Mongolia Autonomous Region, China Zhao Zhenqun, Master, Chief physician, Department of Pediatric Orthopedics, Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010030, Inner Mongolia Autonomous Region, China
  • About author:Zhang Zhifeng, Master, Associate chief physician, Department of Joint Surgery, Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010030, Inner Mongolia Autonomous Region, China Wei Jing, Master, Associate chief nurse, First Department of Hand and Foot Micro-surgery, Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010030, Inner Mongolia Autonomous Region, China
  • Supported by:

     the Natural Science Foundation of Inner Mongolia Autonomous Region, No. 2016MS08130

Abstract:

BACKGROUND: Steroid-induced avascular necrosis of the femoral head has a complex biological process, and its pathogenesis is unknown. To date, there is no effective treatment in clinical practice. Therefore, exploring the etiology of steroid-induced avascular necrosis of the femoral head is still an important content of research in this field.

OBJECTIVE: To explore the effect of grape seed proanthocyanidins on osteocyte apoptosis due to steroid-induced osteonecrosis of the femoral head.  

METHODS: Twenty-seven Japanese white rabbits were randomly divided into three groups. The model group was intravenously injected with E. coli endotoxin, 100 μg/kg, twice at an interval of 24 hours. Two injections of E. coli endotoxin were followed by intramuscular injection of methylprednisolone 20 mg/kg, for 3 times. The interval was 24 hours. The treatment group was intravenously injected with E. coli endotoxin, 100 μg/kg, twice at an interval of 24 hours. After the second injection of E. coli endotoxin, methylprednisolone 20 mg/kg and grape seed proanthocyanidin extract 200 μg/kg were injected intramuscularly three times at an interval of 24 hours. The control group was treated with the same dose of saline intravenously. The animals were killed by air embolization at the 4th week after the last injection. Under the relatively aseptic condition, the bilateral femoral heads were routinely fixed, decalcified, embedded and sliced. Histomorphological observation and hematoxylin-eosin staining were performed to count empty bone lacunae under light microscope. Hoechst staining was used to detect cell apoptosis. The expressions of Caspase-9 and Bcl-2 in the femoral head were detected by immunohistochemical staining.

RESULTS AND CONCLUSION: The percentage of empty bone lacunae in the model group was significantly higher than that in the control group (P < 0.01). The percentage of empty bone lacunae in the treatment group was significantly lower than that in the model group (P < 0.05), but still higher than that in the control group (P < 0.01). There were few apoptotic cells in the femoral head of the control group, but a large number of apoptotic cells with densely stained nuclei in the model group. The number of apoptotic cells in the treatment group was reduced, but still higher than that in the control group (P < 0.01). The average absorbance value of Caspase-9 in the model group was significantly higher than that in the control group (P < 0.01). The average absorbance value decreased significantly in the treatment group as compared with the model group (P < 0.01), but there was no significant difference between the treatment and control groups. The average absorbance value of Bcl-2 in the model group was significantly lower than that in the control group (P < 0.05). The average absorbance value of Bcl-2 increased significantly in the treatment group as compared with the model group (P < 0.01). These findings indicate that osteocyte apoptosis is involved in the occurrence and development of steroid-induced osteonecrosis of the femoral head. Grape seed proanthocyanidins may inhibit osteocyte apoptosis by promoting the expression of Bcl-2 and inhibiting the expression of Caspase-9. 

Key words: glucocorticoid, osteonecrosis of the femoral head, apoptosis, grape seed proanthocyanidins, Caspase-9, Bcl-2

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