Journal of Peking University(Health Sciences) ›› 2020, Vol. 52 ›› Issue (1): 24-29. doi: 10.19723/j.issn.1671-167X.2020.01.004

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Anti-inflammatory and repaired effects of non-steroidal anti-inflammatory drugs on human dental pulp cells

Jing-yi LI,Sai-nan WANG,Yan-mei DONG()   

  1. Department of Cariology and Endodoontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2019-10-07 Online:2020-02-18 Published:2020-02-20
  • Contact: Yan-mei DONG E-mail:kqdongyanmei@bimu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(81870753);Supported by the National Natural Science Foundation of China(81700953)

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Abstract:

Objective: To study the effects of non-steroidal anti-inflammatory drugs (NSAIDs) on anti-inflammation and repair of human dental pulp cells (hDPCs). Methods: Primary hDPCs from the freshly extracted human third molars were cultured and passaged in vitro, and the following experiments were performed using the 4th-6th generations of hDPCs. HDPCs were cultured in Dulbecco’s modified eagle medium (DMEM) containing 1 mg/L lipopolysaccharide (LPS) to obtain LPS irritated hDPCs (LPS-hDPCs), which served as the inflammatory positive group. LPS-hDPCs in the experimental group were cultured in DMEM containing different concentrations (1, 10, and 100 μmol/L) of NSAIDs (aspirin or meloxicam). HDPCs cultured in DMEM were used as the negative control group. The effects of NSAIDs on the proliferation of hDPCs were assessed on the 1st, 3rd, 5th, and 7th day by MTT assay. The effects of NSAIDs on the expression of inflammation related genes interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) of LPS-hDPCs were detected at the 6th hour by real-time PCR. The expression of diffe-rentiation related markers dentin matrix protein-1 (DMP-1) and dentin sialophosphoprotein (DSPP) were detected on the 7th day by real-time PCR. The effects of NSAIDs on the mineralization of LPS-hDPCs were assesd on the 14th day by alizarin red staining. Calcium mineralized nodules were semi-quantitatively determined by cetyl pyridine chloride. Results: MTT assay showed that 1-100 μmol/L aspirin or meloxicam significantly promoted the proliferation of hDPC in a concentration dependent manner (P<0.05). Real-time PCR showed that 1-100 μmol/L meloxicam or 100 μmol/L aspirin down-regulated significantly the mRNA expression of TNF-α and IL-6 of LPS-hDPCs (P<0.05), and 100 μmol/L meloxicam down-regulated IL-6 and TNF-α more significantly than 100 μmol/L aspirin of LPS-hDPCs (P<0.05). Real-time PCR showed that 100 μmol/L meloxicam up-regulated the mRNA expression of DMP-1 and DSPP of LPS-hDPCs significantly (P<0.05). Alizarin red staining showed the meloxicam at the concentration of 100 μmol/L significantly promoted the mineralization of LPS-hDPCs (P<0.05). Conclusion: In this study, meloxicam promoted the proliferation of hDPCs, inhibited the inflammatory reaction and promoted differentiation and mineralization of hDPCs under LPS irritation. The present results suggest that meloxicam may play a role in anti-inflammation and repair of pulp inflammation.

Key words: Anti-inflammatory agents, non-steroidal, Lipopolysaccharides, Dental pulp, Cells, cultured, Meloxicam

CLC Number: 

  • R781.31

Table 1

PCR primer sequences"

Gene Sequence (5'-3')
DMP-1 Forward: AGGAAGTCTCGCATCTCAGAG
Reverse: TGGAGTTGCTGTTTTCTGTAGAG
DSPP Forward: ATATTGAGGGCTGGAATGGGGA
Reverse: TTTGTGGCTCCAGCATTGTCA
IL-6 Forward: CCACTCACCTCTTCAGAACG
Reverse: CATCTTTGGAAGGTTCAGGTTG
TNF-α Forward: CCTCTCTCTAATCAGCCCTCTG
Reverse: GAGGACCTGGGAGTAGATGAG
GAPDH Forward: GAAGGTGAAGGTCGGAGTC
Reverse: GAGATGGTGATGGGATTTC

Figure 1

Effects of NSAID on the proliferation of hDPCs * P<0.05, vs. control group."

Figure 2

Effects of NSAID on LPS-hDPCs’ inflammtory gene TNF-α (A), IL-6 (B) LPS, lipopolysaccharide. * P<0.05, vs. LPS; # P<0.05, vs. LPS+Aspirin 100."

Figure 3

Effects of meloxicam on the expression of DMP-1 (A), DSPP (B) in LPS-hDPCs LPS, lipopolysaccharide. * P<0.05, vs. control group."

Figure 4

Effects of meloxicam on the mineralization of LPS-hDPCs OM, osteogenic-induced medium; LPS, lipopolysaccharide. A, alizarin red staining results of control group; B, alizarin red staining results of OM group; C, alizarin red staining results of OM+LPS group; D, alizarin red staining results of OM+LPS+Meloxicam group; E, calcium concentrations in different groups by cetylpyridinium chloride. * P<0.05, vs. OM group; # P<0.05, vs. OM+LPS group."

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