Chinese Journal of Tissue Engineering Research ›› 2023, Vol. 27 ›› Issue (25): 4057-4062.doi: 10.12307/2023.414

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Expression and significance of pyroptosis associated protein in peripheral tissues with tantalum cage loosening

Long Zhisheng1, Fu Liuxiang2, Gong Feipeng1, Wen Jiabin1, Deng Ying1, Min Huan1, Deng Zhuan1, Chen Gang1   

  1. 1Department of Orthopedics, First Affiliated Hospital of Nanchang Medical College, Jiangxi Provincial People’s Hospital, Nanchang 330006, Jiangxi Province, China; 2Emergency Department, Second Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
  • Received:2022-04-04 Accepted:2022-06-08 Online:2023-09-08 Published:2023-01-18
  • Contact: Fu Liuxiang, Attending physician, Master, Emergency Department, Second Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
  • About author:Long Zhisheng, Master, Associate chief physician, Department of Orthopedics, First Affiliated Hospital of Nanchang Medical College, Jiangxi Provincial People’s Hospital, Nanchang 330006, Jiangxi Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 32060222 (to LZS)

Abstract: BACKGROUND: The mechanism of how the fusion cage affects its surrounding cells and eventually leads to osteolysis with aseptic loosening after implantation of the tantalum (Ta) fusion device into the intervertebral space remains to be elucidated.
OBJECTIVE: To explore the effect of pyroptosis in tantalum (Ta) induced intervertebral osteolysis. 
METHODS: Patients admitted to the Department of Orthopedics, Jiangxi Provincial People’s Hospital from January 2015 to December 2021 were selected in this study. The observation group (n=19) contained the cases of lumbar fusion tantalum cage loosening and revision. The control group (n=11) consisted of autologous bone graft lumbar fusion, internal fixation removal after fusion of other material cages, and degeneration of adjacent segments implanted with tantalum cages requiring extended fixation of the fusion segment. During the operation, the limiting membrane tissue around the cage and around the fusion segment of the two groups was collected for scanning electron microscopy, immunofluorescence staining and qRT-PCR detection. 
RESULTS AND CONCLUSION: (1) Electron microscopy showed that a large amount of fibrous tissue proliferation was observed around the tantalum (Ta) fusion vessel and within the boundary membrane tissue of the fused segment in the observation group. Meanwhile, irregular particles on tantalum shedding could be observed partially, but fibrous tissue proliferation was not obvious in the control group, and no irregular particles were found. (2) Hematoxylin and eosin staining showed that a large amount of fibrous tissue proliferation with indistinct osteoblasts was observed in the boundary membrane tissue around the fusions and in the fused segments, and osteoblasts were not obvious in the observation group. Fibrous tissue proliferation was not obvious in the limiting membrane tissue of the control group, and osteoblasts were seen distributed around the bone tissue. (3) Immunofluorescence examination showed that the expression of pyroptosis-related proteins GSDMD, NLRP3 and Caspase 1 in the limiting membrane tissue in the observation group was higher than that in the control group (P < 0.05). (4) qRT-PCR assay showed that mRNA expression levels of GSDMD, Caspase 1 and NLRP3 in the observation group were higher than those in the control group (P < 0.05). (5) These results showed that the expression of pyroptosis related proteins (GSDMD, NLRP3, and Caspase 1) was remarkably increased in tantalum (Ta) fusion loosening cases, indicating that pyroptosis was involved in the pathophysiology of tantalum (Ta) induced intervertebral osteolysis.

Key words: tantalum (Ta), fusion cage, pyroptosis, osteolysis, bone tissue engineering, spinal fusion, limiting membrane tissue

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