Abstract
Obesity of children and adolescents (OCA) is often accompanied by metabolic syndrome (MetS), which often leads to adult obesity and subsequent complications, yet the entire pathophysiological response is not fully understood. The number and composition of circulating extracellular vesicles (EV) reflect overall patient condition; therefore, we investigated the pathophysiological condition of OCA, including MetS-associated dysmetabolism, using circulating EVs. In total, 107 children and adolescents with or without obesity (boys, n = 69; girls, n = 38; median age, 10 years) were enrolled. Circulating EV number and EV protein composition were assessed via flow cytometry and liquid chromatography tandem-mass spectrometry, respectively. In a multivariate analysis, relative body weight (standardized partial regression coefficient (SPRC) 0.469, P = 0.012) and serum triglyceride level (SPRC 0.548, P < 0.001) were detected as independent parameters correlating with circulating EV number. Proteomic analysis identified 31 upregulated and 45 downregulated EV proteins in OCA. Gene ontology analysis revealed upregulated proteins to be involved in various biological processes, including intracellular protein transport, protein folding, stress response, leukocyte activation, innate immune response, and platelet degranulation, which can modulate lipid and glucose metabolism, skeletal and cardiac muscle development, inflammation, immune response, carcinogenesis, and cancer progression. Notably, several identified EV proteins are involved in neuro-development, neurotransmitter release, and neuro-protective agents in OCA. Circulating EVs were derived from adipocytes, hepatocytes, B cell lymphocytes, and neurons. Circulating EV number is significantly associated with MetS-related dysmetabolism and the EV protein cargo carries a special “signature” that reflects the alteration of various biological processes under the pathophysiological condition of OCA.
Key messages
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Circulating EV number correlates with physical and laboratory parameters for obesity in children and adolescents.
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Relative body weight and triglyceride are independent factors for increased circulating EVs.
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EV composition is significantly changed in obesity of children and adolescents.
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Identified EV composition changes associated with obesity and involves in metabolism, immune response, and cancer progression.
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Circulating EVs are partially derived from adipocyte, hepatocytes, B cells, and neurons.
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Acknowledgements
The authors would like to thank the paramedical for technical assistance at National Hospital Organization Mie National Hospital.
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This work was supported by JSPS KAKENHI Grant Number 21K11572 to YK, and Japan Science and Technology Agency to AE and KI.
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YK and AE contributed to study concept and design, interpretation of data, and drafting of the manuscript. KI, MT, KI, TT, KK, MN, and NF contributed to the acquisition of data. MI, HN, TF, and KT contributed to study supervision. All the authors have read and agreed to the published version of the manuscript.
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Kobayashi, Y., Eguchi, A., Imami, K. et al. Circulating extracellular vesicles are associated with pathophysiological condition including metabolic syndrome-related dysmetabolism in children and adolescents with obesity. J Mol Med 102, 23–38 (2024). https://doi.org/10.1007/s00109-023-02386-5
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DOI: https://doi.org/10.1007/s00109-023-02386-5