1.Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
2.State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing 102206, China
3.School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, Anhui Province, China
4.Beijing Institute of Radiation Medicine, Beijing 100850, China
* max19920503@163.com;
yrh1980110@126.com;
xiaomingyang@sina.com
纸质出版:2021-12
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Toll-like receptor 5-mediated signaling enhances liver regeneration in mice[J]. 解放军医学杂志(英文版), 2021,8(4):490-502.
Zhang et al.: Toll-like receptor 5-mediated signaling enhances liver regeneration in mice. Mil Med Res, 2021, 8: 16.
Toll-like receptor 5-mediated signaling enhances liver regeneration in mice[J]. 解放军医学杂志(英文版), 2021,8(4):490-502. DOI: 10.1186/s40779-021-00309-4.
Zhang et al.: Toll-like receptor 5-mediated signaling enhances liver regeneration in mice. Mil Med Res, 2021, 8: 16. DOI: 10.1186/s40779-021-00309-4.
Background:
2
Toll-like receptor 5 (TLR5)-mediated pathways play critical roles in regulating the hepatic immune response and show hepatoprotective effects in mouse models of hepatic diseases. However
the role of TLR5 in experimental models of liver regeneration has not been reported. This study aimed to investigate the role of TLR5 in partial hepatectomy (PHx)-induced liver regeneration.
Methods:
2
We performed 2/3 PHx in wild-type (WT) mice
TLR5 knockout mice
or TLR5 agonist CBLB502 treated mice
as a model of liver regeneration. Bacterial flagellin content was measured with ELISA
and hepatic TLR5 expression was determined with quantitative PCR analyses and flow cytometry. To study the effects of TLR5 on hepatocyte proliferation
we analyzed bromodeoxyuridine (BrdU) incorporation and proliferating cell nuclear antigen (PCNA) expression with immunohistochemistry (IHC) staining. The effects of TLR5 during the priming phase of liver regeneration were examined with quantitative PCR analyses of immediate early gene mRNA levels
and with Western blotting analysis of hepatic NF-κB and STAT3 activation. Cytokine and growth factor production after PHx were detected with real-time PCR and cytometric bead array (CBA) assays. Oil Red O staining and hepatic lipid concentrations were analyzed to examine the effect of TLR5 on hepatic lipid accumulation after PHx.
Results:
2
The bacterial flagellin content in the serum and liver increased
and the hepatic TLR5 expression was significantly up-regulated in WT mice after PHx. TLR5-deficient mice exhibited diminished numbers of BrdU- and PCNA-positive cells
suppressed immediate early gene expression
and decreased cytokine and growth factor production. Moreover
PHx-induced hepatic NF-κB and STAT3 activation was inhibited in
Tlr5
–/–
mice
as compared with WT mice. Consistently
the administration of CBLB502 significantly promoted PHx-mediated hepatocyte proliferation
which was correlated with enhanced production of proinflammatory cytokines and the recruitment of macrophages and neutrophils in the liver. Furthermore
Tlr5
–/–
mice displayed significantly lower hepatic lipid concentrations and smaller Oil Red O positive areas than those in control mice after PHx.
Conclusions:
2
We reveal that TLR5 activation contributes to the initial events of liver regeneration after PHx. Our findings demonstrate that TLR5 signaling positively regulates liver regeneration and suggest the potential of TLR5 agonist to promote liver regeneration.
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