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RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway

  • Authors:
    • Qin Deng
    • Hong Duo
    • Qifa Ye
    • Ruoping Chen
    • Zhihui Fu
    • Jiansheng Xiao
    • Huaqin Pan
    • Qi Xiao
  • View Affiliations / Copyright

    Affiliations: Department of Transplantation, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi 330006, P.R. China, Hubei Key Laboratory of Medical Technology on Transplantation, Wuhan, Hubei 430071, P.R. China
    Copyright: © Deng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 225
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    Published online on: October 16, 2025
       https://doi.org/10.3892/ijmm.2025.5666
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Abstract

Sepsis‑induced liver injury increases mortality through inflammatory dysregulation. Although Radioprotective 105 (RP105) modulates inflammation, its role in septic liver injury remains unclear. The present study investigates the mechanism of RP105 in sepsis‑driven hepatic damage. Sepsis was induced in RP105 knockout (KO) and wild‑type (WT) mice via cecal ligation and puncture (CLP). Liver injury was assessed by serum alanine aminotransferase (ALT)/aspartate aminotransferase (AST), histology (H&E), inflammatory markers (anti‑myeloperoxidase, F4/80, IL‑1β, IL‑6 and TNF‑α) and apoptosis markers (Caspase‑3, BAX/BCL‑2 ratio, GADD45A and PUMA). RNA sequencing identified key differentially expressed genes. RP105‑suppressor of cytokine signaling (SOCS) 2 interaction was validated by co‑immunoprecipitation (Co‑IP) and JAK2/STAT3 pathway activity was measured by western blotting. Lipopolysaccharide‑stimulated RP105‑KO macrophages were used in vitro. RP105‑KO mice exhibited exacerbated liver injury post‑CLP, evidenced by significantly elevated ALT/AST (P<0.001), expanded hepatic necrosis (P<0.001), increased inflammatory infiltration (P<0.001), upregulated pro‑inflammatory cytokines (IL‑1β, IL‑6 and TNF‑α; P<0.001) and enhanced Caspase‑3 expression (P<0.001). RNA‑seq identified SOCS2 as a key RP105‑regulated DEG (fold change >2.0; FDR <0.05). Co‑IP confirmed RP105‑SOCS2 binding in WT liver which was absent in KO mice. SOCS2 protein remained decreased in KO + CLP vs. WT (P<0.001). RP105 deletion activated JAK2/STAT3 signaling in vivo and in vitro (P<0.001). RP105 protects against septic liver injury by binding SOCS2 to inhibit JAK2/STAT3 signaling, thereby attenuating inflammation and apoptosis. The present study is the first to demonstrate the RP105‑SOCS2 interaction in septic liver injury, revealing the RP105/SOCS2 axis as a potential therapeutic target.
View Figures

Figure 1

Knockout of RP105 exacerbates hepatic
injury in the CLP model. (A) Simplified diagram of CLP in mice. (B)
IHC staining of RP105 was carried out on a paraffin-embedded
section of the liver tissues of mice. (C) IHC staining of RP105 was
quantified using Image-Pro Plus 6.0. (D) mRNA expression levels in
the liver of RP105 was tested by reverse transcription-quantitative
PCR. The levels of (E) ALT and (F) AST in serum. (G) H&E
staining and histological injury score in mouse liver tissue. (H)
Histological scores. Ns, P>0.05, **P<0.01 and
***P<0.001. CLP, cecal ligation and puncture; IHC,
immunohistochemical; WT, wild-type; KO, knockout; AST, aspartate
aminotransferase; ALT, alanine aminotransferase; RP105,
radioprotective 105.

Figure 2

KO of RP105 exacerbates hepatic
inflammation in the CLP model. (A) IF staining of MPO was carried
out on a paraffin-embedded section of the liver tissues of mice.
(B) IF stained fluorescence of MPO was quantified using Image-pro
plus 6.0. (C) IF staining of F4/80 was carried out on a
paraffin-embedded section of mouse liver tissues. (D) IF stained
fluorescence of F4/80 was quantified using Image-pro plus 6.0. mRNA
expression levels in the liver of (E) IL-1β, (F) IL-6 and (G) TNF-α
were tested by reverse transcription-quantitative PCR. Ns,
P>0.05, *P<0.05 and ***P<0.001. CLP,
cecal ligation and puncture; WT, wild-type; KO, knockout; MPO,
anti-myeloperoxidase; IF, immunofluorescence; RP105,
radioprotective 105.

Figure 3

KO of RP105 aggravates hepatocyte
apoptosis in the CLP model. (A) IHC staining of Caspase3 was
carried out on a paraffin-embedded section of the mice liver
tissues. (B) IHC-stained fluorescence of Caspase3 was quantified.
(C) Representative images of western blotting and analysis of (D)
BAX/BCL2 ratio. (E) PUMA and (F) GADD45A as a ratio of β-actin
proteins. Expression. ns, P>0.05, *P<0.05,
**P<0.01 and ***P<0.001. CLP, cecal
ligation and puncture; WT, wild-type; KO, knockout; IHC,
immunohistochemical; RP105, radioprotective 105.

Figure 4

RP105 exhibits the ability to
interact with SOCS2. (A) Heatmap of cluster analysis. (B) Volcano
plot of differential gene expression. Among them, SOCS2 is
significantly upregulated. (C) Co-IP analysis of the interaction
between RP105 and SOCS2 in WT mouse tissues. (D) Co-IP analysis of
the interaction between RP105 and SOCS2 in WT and RP105 KO mice
tissues. RP105, radioprotective 105; SOCS2, suppressor of cytokine
signaling 2; WT, wild-type; KO, knockout; WB, western blotting.

Figure 5

RP105 exhibits the ability to
interact with SOCS2 and reduce SOCS2 expression in the liver of
sepsis by knockdown of RP105. (A) IF staining of SOCS2 was carried
out on a paraffin-embedded section of the mice liver tissues. (B)
IF-stained fluorescence of SOCS2 was quantified using Image-pro
plus 6.0. (C) Representative images of western blotting and
analysis of (D) RP105, (E) SOCS2 protein expression as a ratio of
β-actin protein expression. *P<0.05,
**P<0.01 and ***P<0.001. RP105,
radioprotective 105; SOCS2, suppressor of cytokine signaling 2; WT,
wild-type; KO, knockout; CLP, cecal ligation and puncture.

Figure 6

RP105 mediates SOCS2 expression in
hepatic inflammation and injury in the CLP model through the
JAK2/STAT3 pathway. (A) Representative images of western blotting
and analysis of (B) p-JAK2/JAK2 and (C) p-STAT3/STAT3. ns,
P>0.05, *P<0.05, **P<0.01 and
***P<0.001. p, phosphorylated; WT, wild-type; KO,
knockout; CLP, cecal ligation and puncture.

Figure 7

RAW264.7 cells with KO of RP105 gene
expression exhibits exacerbated damage from LPS under the influence
of the JAK2/STAT3 signaling pathway. (A) Representative flow
cytometric images and (B) analysis of apoptosis after LPS treatment
in RAW264.7 cells. (C) Representative western blotting images and
analysis of (D) RP105/β-actin, (E) SOCS2/β-actin, (F) p-JAK2/JAK2
and (G) p-STAT3/STAT3. ns, P>0.05, *P<0.05,
**P<0.01 and ***P<0.001. LPS,
lipopolysaccharide; NC, negative control; KO, knockout; RP105,
radioprotective 105; SOCS2, suppressor of cytokine signaling 2.
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Spandidos Publications style
Deng Q, Duo H, Ye Q, Chen R, Fu Z, Xiao J, Pan H and Xiao Q: RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway. Int J Mol Med 56: 225, 2025.
APA
Deng, Q., Duo, H., Ye, Q., Chen, R., Fu, Z., Xiao, J. ... Xiao, Q. (2025). RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway. International Journal of Molecular Medicine, 56, 225. https://doi.org/10.3892/ijmm.2025.5666
MLA
Deng, Q., Duo, H., Ye, Q., Chen, R., Fu, Z., Xiao, J., Pan, H., Xiao, Q."RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway". International Journal of Molecular Medicine 56.6 (2025): 225.
Chicago
Deng, Q., Duo, H., Ye, Q., Chen, R., Fu, Z., Xiao, J., Pan, H., Xiao, Q."RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway". International Journal of Molecular Medicine 56, no. 6 (2025): 225. https://doi.org/10.3892/ijmm.2025.5666
Copy and paste a formatted citation
x
Spandidos Publications style
Deng Q, Duo H, Ye Q, Chen R, Fu Z, Xiao J, Pan H and Xiao Q: RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway. Int J Mol Med 56: 225, 2025.
APA
Deng, Q., Duo, H., Ye, Q., Chen, R., Fu, Z., Xiao, J. ... Xiao, Q. (2025). RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway. International Journal of Molecular Medicine, 56, 225. https://doi.org/10.3892/ijmm.2025.5666
MLA
Deng, Q., Duo, H., Ye, Q., Chen, R., Fu, Z., Xiao, J., Pan, H., Xiao, Q."RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway". International Journal of Molecular Medicine 56.6 (2025): 225.
Chicago
Deng, Q., Duo, H., Ye, Q., Chen, R., Fu, Z., Xiao, J., Pan, H., Xiao, Q."RP105 exerts hepatoprotective effects in sepsis by modulating the SOCS2/JAK2/STAT3 signaling pathway". International Journal of Molecular Medicine 56, no. 6 (2025): 225. https://doi.org/10.3892/ijmm.2025.5666
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