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Chinese Journal of Stomatological Research(Electronic Edition) ›› 2023, Vol. 17 ›› Issue (01): 37-44. doi: 10.3877/cma.j.issn.1674-1366.2023.01.005

• Original Article • Previous Articles     Next Articles

Effect of targeting p38MAPK on scar hyperplasia after rabbit cleft lip repair in vivo

Yingying Ge1, Jin Yue1, Lingfa Xue1, Yaoxiang Xu1, Haoran Zhao2, Mingxue Cui1, Wenlin Xiao1,()   

  1. 1. Department of the Affiliated Hospital of Qingdao University, Qingdao 266555, China; School of Stomatology of Qingdao University, Qingdao 266071, China
    2. Department of the Affiliated Hospital of Qingdao University, Qingdao 266555, China
  • Received:2022-06-16 Online:2023-02-01 Published:2023-02-16
  • Contact: Wenlin Xiao
  • Supported by:
    Natural Science foundation of Shandong Province(ZR2015HM022)

Abstract:

Objective

The recombinant adenovirus of p38 mitogen-activated protein kinases (p38MAPK) gene was used to knock down the expression of target genes. By detecting the influence of p38MAPK signal pathway obstruction on upper lip scar hyperplasia in different time periods, the optimal therapeutic time of gene therapy was determined.

Methods

A total of ninety New Zealand white rabbits with cleft upper lip of 2.0-2.5 kg were treated with cleft lip repair. Recombinant virus was injected into the scar center at week 0, 1 and 2 after surgery, and the scar tissue was made into specimens at week 3 after surgery. Western blot, Real-time fluorescence quantitative RT-PCR and immunohistochemical staining were used to quantitatively and qualitatively detect the relative expression levels of proteins and mRNA of p38MAPK, scar formation related factors and Smad. The results of Western blot and RT-PCR were analyzed with software (SPSS v. 24.0) .

Results

The results of Western blot, RT-PCR and immunohistochemical staining showed that the expressions of Col Ⅲ (1.373 ± 0.073, F = 8.027, P = 0.002) and MMP1 (1.715 ± 0.028, F = 9.262, P = 0.001) in scar tissue of the injection group at week 1 after surgery were significantly higher than those at week 0 and 2. The expressions of ColⅠ (0.424 ± 0.015, F = 7.794, P = 0.003) and TIMP1 (0.464 ± 0.025, F = 6.196, P = 0.007) significantly decreased. The expression level of Smad protein and mRNA in the injection group at 1 week after surgery decreased, and the results were statistically significant compared with other groups (Fp-smad2 = 14.123, Pp-smad2 = 0.029; Fp-smad3 = 3.796, Pp-smad3 = 0.037) .

Conclusions

Inhibition of p38MAPK expression may play a role in inhibiting scar hyperplasia through the Smad dependent signaling pathway. Targeted p38MAPK knockdown had the greatest effect on scar hyperplasia at one week after cleft-lip surgery in rabbit upper lip.

Key words: p38 mitogen-activated protein kinases (p38MAPK), Gene silencing, Adenovirus, Hypertrophic scar, Gene therapy

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