Silencing SOCS3 could inhibit TNF-α induced apoptosis in 3T3-L1 and mouse preadipocytes

Area of Science:

• Cell Biology
• Molecular Biology
• Immunology

Background:

• Tumor necrosis factor-alpha (TNF-α) is a pro-inflammatory cytokine implicated in cellular apoptosis.
• Understanding the molecular mechanisms regulating TNF-α-induced apoptosis is crucial for developing therapeutic interventions.
• The suppressor of cytokine signalling (SOCS) family, particularly SOCS3, plays a role in cytokine signalling pathways.

Purpose of the Study:

• To investigate the effect of SOCS3 siRNA on TNF-α induced apoptosis in 3T3-L1 preadipocytes and mouse preadipocytes.
• To elucidate the role of SOCS3 in regulating apoptosis-associated genes and the JAK/STAT3 pathway in response to TNF-α.

Main Methods:

• 3T3-L1 and mouse preadipocytes were transfected with SOCS3 siRNA.
• Cells were treated with TNF-α (100 ng/mL for 24 h).
• Apoptosis was assessed via morphological changes (Hoechst 33258 and PI staining) and gene/protein expression analysis (qPCR, Western blotting) of apoptosis-related genes (c-myc, survivin, mcl-1, bcl-2, bax, NF-κB) and JAK/STAT3 pathway components (SOCS1, SOCS2, JAK2, STAT3).

Main Results:

• SOCS3 siRNA significantly decreased TNF-α induced apoptosis in preadipocytes (P < 0.01).
• Silencing SOCS3 upregulated anti-apoptotic genes (c-myc, survivin, mcl-1, bcl-2, NF-κB) and downregulated pro-apoptotic gene bax (P < 0.05).
• Protein levels of Bcl-2 and NF-κB increased, while Bax decreased. SOCS1 mRNA was downregulated, and p-STAT3 protein was upregulated, indicating modulation of the JAK/STAT3 pathway.

Conclusions:

• Silenced SOCS3 effectively inhibits TNF-α induced apoptosis in 3T3-L1 and mouse preadipocytes.
• SOCS3 regulates apoptosis by modulating the expression of apoptosis-associated genes through the JAK/STAT3 signaling pathway.
• Targeting SOCS3 presents a potential strategy for controlling TNF-α mediated cellular apoptosis.