Abstract
High fructose flux enhances hepatocellular triglyceride accumulation (hepatic steatosis), which is a prime trigger in the emergence of hepatic ailments. Nevertheless, the pathophysiology underlying the process is not completely understood. Emerging evidences have revealed the inputs from multiple cues including inflammation, oxidative stress, and endoplasmic reticulum (ER) stress in the development of hepatic steatosis. Here, we substantiated the role of NLRP3 inflammasome and its convergence with oxidative and ER stress leading to hepatic steatosis under high fructose diet feeding. Male SD rats were fed on 60% high fructose diet (HFrD) for 10 weeks and treated with antioxidant quercetin or NLRP3 inflammasome inhibitor glyburide during the last 6 weeks, followed by metabolic characterization and analysis of hepatic parameters. HFrD-induced hepatic steatosis was associated with the activation of NLRP3 inflammasome, pro-inflammatory response, oxidative, and ER stress in liver. Treatment with quercetin abrogated HFrD-induced oxidative stress, along with attenuation of NLRP3 activation in the liver. On the other hand, inhibition of NLRP3 signaling by glyburide suppressed HFrD-induced oxidative and ER stress. Both glyburide or quercetin treatment significantly attenuated hepatic steatosis, associated with mitigated expression of the lipogenic markers in liver. Our findings verified the association of NLRP3 inflammasome with oxidative and ER stress in fructose-induced lipogenic response and indicate that in addition to be a target of oxidative/ER stress, NLRP3 can act as a trigger for oxidative/ER stress to activate a vicious cycle where these cues act in a complex manner to propagate inflammatory response, leading to hepatic steatosis.
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All the materials and data reported in the manuscript are available with the corresponding author (AK Tamrakar).
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Acknowledgements
Authors would like to acknowledge funding support by the grant (EMR/2017/000936) from Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India. SS, AS, SA, FG, and PK acknowledge the financial support in the form of Research Fellowship from the Council of Scientific and Industrial Research (CSIR), New Delhi. This manuscript bears the CDRI communication No. 10438.
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This work was supported by the grant (EMR/2017/000936) from Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by S. Singh, A. Sharma, B. Guru, S. Ahmad, F. Gulzar, I. Ahmad, and P. Kumar. Conceptualization, supervision, and data analysis were performed by A.K. Tamrakar. The first draft of the manuscript was written by S. Singh and A.K. Tamrakar and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Animal experimental protocol reported in the study was approved by the Institutional Animal Ethics Committee (IAEC) of the CSIR-Central Drug Research Institute, Lucknow, and work with the animals was conducted in accordance with the guidelines of the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA), Government of India.
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Singh, S., Sharma, A., Ahmad, S. et al. Convergence of Fructose-Induced NLRP3 Activation with Oxidative Stress and ER Stress Leading to Hepatic Steatosis. Inflammation 46, 217–233 (2023). https://doi.org/10.1007/s10753-022-01727-9
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DOI: https://doi.org/10.1007/s10753-022-01727-9