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Updated: Aug 8, 2026
Differentiated Mouse Adipocytes in Primary Culture: A Model of Insulin Resistance
Published on: February 17, 2023
Food additives with aldehyde skeleton exhibited leptin resistance in cells
Yuki Shibuya1, Haruto Yoshida1, Kyoshiro Tsuge2
1Department of Pharmacotherapy, Graduate School of Pharmaceutical Sciences, Sanyo Onoda City University, Sanyo Onoda, Yamaguchi, Japan.
Abstract:
Obesity, a major health issue linked to metabolic disorders, is driven by multiple factors, including impaired leptin signaling, particularly in the Janus kinase 2 (JAK2)/Signal transducer and activator of transcription 3 (STAT3) pathway. This study investigated the impact of aldehyde-containing food additives on leptin receptor activated signaling in cells. We examined the effects of 39 different aldehyde-containing compounds, commonly used in food additives, on leptin-induced STAT3 transcriptional activity through a reporter gene assay. Three aldehydes, i.e., 2-pyrrolecarboxaldehyde, o-anisaldehyde, and piperonal were found to reduce leptin-induced STAT3 transcriptional activity in a concentration-dependent manner without affecting cell viability. These additives did not alter conformational changes of the leptin receptor, STAT3 phosphorylation, or its nuclear translocation, nor did they induce endoplasmic reticulum stress. These additives likely affect a downstream step in leptin signaling, specifically transcriptional regulation by STAT3, without disrupting early receptor signaling events. These finding suggest that some aldehyde-based food additives may contribute to leptin resistance and potentially to the development of obesity.
Insights
Certain food additives containing aldehydes may disrupt leptin signaling, potentially contributing to obesity. These compounds interfere with the Janus kinase 2 (JAK2)/Signal transducer and activator of transcription 3 (STAT3) pathway, impacting metabolic health.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Health
Background:
- Obesity is a complex health issue linked to metabolic disorders.
- Impaired leptin signaling, particularly via the JAK2/STAT3 pathway, is implicated in obesity.
- Food additives are common and their biological effects require investigation.
Purpose of the Study:
- To investigate the impact of aldehyde-containing food additives on leptin receptor signaling.
- To identify specific aldehydes that affect leptin-induced STAT3 transcriptional activity.
- To elucidate the mechanism by which these additives interfere with leptin signaling.
Main Methods:
- Utilized a reporter gene assay to measure leptin-induced STAT3 transcriptional activity.
- Screened 39 different aldehyde-containing compounds commonly used in food additives.
- Assessed effects on cell viability, leptin receptor conformation, STAT3 phosphorylation, nuclear translocation, and endoplasmic reticulum stress.
Main Results:
- Three aldehydes (2-pyrrolecarboxaldehyde, o-anisaldehyde, piperonal) inhibited leptin-induced STAT3 transcriptional activity in a dose-dependent manner.
- These aldehydes did not affect cell viability, leptin receptor signaling, STAT3 phosphorylation/translocation, or endoplasmic reticulum stress.
- The inhibition occurred downstream of early receptor signaling events, affecting STAT3 transcriptional regulation.
Conclusions:
- Aldehyde-containing food additives can interfere with leptin signaling at the transcriptional level.
- These findings suggest a potential mechanism linking certain food additives to leptin resistance and obesity development.
- Further research is warranted to understand the full implications for metabolic health.
