Baicalin relieves inflammation stimulated by lipopolysaccharide via upregulating TUG1 in liver cells

  • Yanqiu Huang
  • Mengyan Sun
  • Xuefang Yang
  • Aiyu Ma
  • Yujie Ma
  • Aiying ZhaoEmail author
Original Article


Hepatitis has become a major social, health, and economic problem worldwide. Herein, we tested the beneficial influence of baicalin, a flavonoid extracted from the roots of Scutellaria baicalensis, on human normal liver L-02 and THLE2 cell apoptosis and inflammatory reaction stimulated by lipopolysaccharide (LPS) and possible molecular mechanisms. L-02 and THLE2 cell viability and apoptosis after LPS and/or baicalin treatment were tested using CCK-8 assay and Annexin V-FITC/PI apoptosis kit, respectively. qRT-PCR was used to measure the MCP-1, IL-6, TNF-α, and lncRNA taurine upregulated gene 1 (TUG1) expressions in L-02 and THLE2 cells. sh-TUG1 was transfected to knockdown TUG1. SB203580 was used as inhibitor of p38MAPK pathway, while SP600125 was used as inhibitor of JNK pathway. We discovered that LPS stimulation caused L-02 and THLE2 cell apoptosis and inflammatory reaction. Baicalin relieved the L-02 and THLE2 cell apoptosis and inflammatory reaction stimulated by LPS. Moreover, LPS lowered the TUG1 expression in L-02 cells, while baicalin promoted the TUG1 expression in L-02 and L-02 and THLE2 cells, as well as inactivated p38MAPK and JNK pathways in LPS-stimulated L-02 cells. Besides, knockdown of TUG1 activated p38MAPK and JNK pathways and promoted inflammatory cytokine expression in L-02 cells. In conclusion, this study further affirmed the beneficial influences of baicalin on LPS-stimulated human normal liver cell apoptosis and inflammatory reaction. Baicalin relived liver cell inflammation stimulated by LPS might be via upregulating TUG1 and then inactivating p38MAPK and JNK pathways.


Hepatitis Baicalin Lipopolysaccharide LncRNA TUG1 p38MAPK pathway JNK pathway 


Author contributions

Yanqiu Huang, Aiying Zhao: conceived and designed the experiments.

Yanqiu Huang, Mengyan Sun, Xuefang Yang, Aiyu Ma, Yujie Ma: data collection.

Yanqiu Huang, Aiying Zhao: manuscript writing.

Compliance with ethical standards

Conflict of interest

The authors declare that there is no conflict of interest.


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Copyright information

© University of Navarra 2019

Authors and Affiliations

  1. 1.Department of Infectious DiseasesHeze Municipal HospitalHezeChina
  2. 2.Department of Clinical LaboratoryHeze Municipal HospitalHezeChina

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