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Protective effects of SOCS3 overexpression in high glucose‑induced lung epithelial cell injury through the JAK2/STAT3

Wei-Na Duan1, Zhong-Yuan Xia1, Min Liu1

  • 1Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China.

Molecular Medicine Reports
|July 18, 2017
PubMed

Insights

High glucose levels harm lung cells by activating the Janus kinase (JAK)/signal transducer and activator of transcription (STAT) pathway. Suppressor of cytokine signaling 3 (SOCS3) may protect against this hyperglycemia-induced lung injury.

Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Molecular Signaling

Background:

  • The Janus kinase (JAK)/signal transducer and activator of transcription (STAT) pathway is implicated in hyperglycemia-induced lung injury.
  • Understanding the regulatory mechanisms of this pathway in lung epithelial cells is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the role of suppressor of cytokine signaling 3 (SOCS3) in regulating the JAK2/STAT3 pathway under high glucose conditions in A549 human pulmonary epithelial cells.
  • To explore the potential of targeting the SOCS3/JAK2/STAT3 pathway for treating hyperglycemia-induced lung injury.

Main Methods:

  • A549 cells were treated with high glucose (HG).
  • Cell viability was assessed using Cell Counting Kit-8 and lactate dehydrogenase assays.
  • Inflammatory markers (IL-6, TNF-α) were measured by ELISA.
  • Protein levels of SOCS3, JAK2, STAT3, p-JAK2, and p-STAT3 were analyzed via western blot.
  • Cells were treated with a JAK2/STAT3 inhibitor (tyrphostin AG490) or subjected to SOCS3 overexpression.

Main Results:

  • High glucose significantly decreased cell viability and increased IL-6 and TNF-α levels in A549 cells.
  • HG stimulation led to increased protein levels of SOCS3, p-JAK2, and p-STAT3.
  • JAK2/STAT3 inhibition or SOCS3 overexpression ameliorated HG-induced cellular damage and inflammation.
  • SOCS3 overexpression and JAK2/STAT3 inhibition enhanced cell viability and suppressed inflammatory cytokine levels.

Conclusions:

  • The SOCS3/JAK2/STAT3 signaling pathway is involved in high glucose-induced responses in lung cells.
  • Overexpression of SOCS3 or inhibition of the JAK2/STAT3 pathway may offer a therapeutic approach to prevent hyperglycemia-induced lung injury, particularly in diabetic conditions.

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