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Signaling pathways utilized by tumor necrosis factor receptor 1 in adipocytes to suppress differentiation
1Harvard School of Public Health, Division of Biological Sciences and Department of Nutrition, 665 Huntington Ave., Boston, MA 02115, USA.
Abstract:
Tumor necrosis factor-alpha (TNFalpha) has profound effects on cultured adipocytes, one of which is the inhibition of terminal differentiation. Previous studies in TNF receptor (TNFR)-deficient preadipocytes have demonstrated that the anti-adipogenic effect of both secreted and transmembrane TNFalpha is mediated solely by TNFR1. In this study, we performed a structure-function analysis of the intracellular domains of TNFR1 and investigated the signaling pathway(s) involved in TNFR1-mediated inhibition of adipocyte differentiation. Our results show that repression of adipogenesis required the juxtamembrane and death domains and was independent of the pathways involving nuclear factor kappaB and neutral sphingomyelinase.
Insights
Tumor necrosis factor-alpha (TNFalpha) inhibits adipocyte differentiation via TNFR1. This effect requires specific TNFR1 intracellular domains, independent of NF-kappaB and NSM pathways.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Tumor necrosis factor-alpha (TNFalpha) is a cytokine with significant roles in cellular processes.
- TNFalpha is known to inhibit the terminal differentiation of adipocytes.
- Previous research indicated that Tumor necrosis factor receptor 1 (TNFR1) mediates this anti-adipogenic effect.
Purpose of the Study:
- To conduct a structure-function analysis of TNFR1's intracellular domains.
- To investigate the specific signaling pathways involved in TNFR1-mediated inhibition of adipocyte differentiation.
Main Methods:
- Structure-function analysis of TNFR1 intracellular domains.
- Investigation of signaling pathways including nuclear factor kappaB (NF-kappaB) and neutral sphingomyelinase (NSM).
Main Results:
- The inhibition of adipogenesis by TNFalpha is dependent on the juxtamembrane and death domains of TNFR1.
- This repression of adipogenesis was found to be independent of the NF-kappaB signaling pathway.
- The anti-adipogenic effect was also independent of the neutral sphingomyelinase pathway.
Conclusions:
- Specific intracellular domains of TNFR1 are crucial for mediating the anti-adipogenic effects of TNFalpha.
- The signaling pathways involving NF-kappaB and neutral sphingomyelinase are not involved in this process.