Abstract
Recent findings in experimental models have shown that the microRNA miR-132 (mir-132) is an important regulator of liver homeostasis and lipid metabolism. We aimed to assess miR-132 expression in liver and fat tissues of obese individuals and examine its association with blood pressure (BP) and hepatic steatosis. We examined obese individuals undergoing bariatric surgery for weight loss (n = 19). Clinical and demographic information was obtained. Quantitative PCR was performed to determine tissue expression of miR-132 in liver and subcutaneous and visceral fat biopsies obtained during bariatric surgery. Liver biopsies were read by a single liver pathologist and graded for steatosis, inflammation and fibrosis. Participants (aged 39 ± 8.1 years) had a body mass index (BMI) of 42 ± 4.5 kg/m2 and presented with 2.2 ± 1.2 metabolic abnormalities. Supine BP was 127 ± 16/74 ± 11 mmHg. Hepatic and visceral fat expression of miR-132 were correlated (r = 0.59, P = 0.033). There was no correlation between subcutaneous and visceral expression of miR-132 (r = −0.31, P = 0.20). Hepatic and visceral fat miR-132 expression were associated with BMI (r = 0.62 and r = 0.68, P = 0.049 respectively) and degree of liver steatosis (r = 0.60 and r = 0.55, P < 0.05, respectively). Subcutaneous fat miRNA-132 expression was correlated to office systolic BP (r = 0.46, P < 0.05), several aspects of 24 h BP (24 h systolic BP: r = 0.52; day systolic BP: r = 0.59, P < 0.05 for all), plasma triglycerides (r = 0.51, P < 0.01) and liver enzymes (ALT: r = −0.52; AST: r = −0.48, P < 0.05 for all). We found an association between miR-132 and markers of cardiovascular and metabolic disease. Reduction of miR-132 may be a target for the regulation of liver lipid homeostasis and control of obesity-related blood pressure.
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Acknowledgements
Supported in part by funding from the National Health and Medical Research Council of Australia (NHMRC), Swinburne Research at Swinburne University of Technology, the Victorian Government’s Operational Infrastructure Support Program and The Israeli Ministry of Economy and Industry. Professor Schlaich is supported by a career fellowship from the NHMRC. Associate Professor Marques is supported by a National Heart Foundation Future Leader Fellowship. Professor Head is supported by National Health and Medical Research Council of Australia fellowship.
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NE, JBD, EAL, MPS, and GWL were involved in all aspects of the study. They conceived and designed the protocol, were involved in participant recruitment and acquisition of data and drafting of the paper. JBD and MPS were involved in clinical aspects of the study, EAL coordinated physiological testing and NE oversaw biochemical and molecular methodologies. FZM provided expert advice around detection of microRNAs, acquired data and drafted and revised the paper. HG, YT, DSG, and HS provided insight into the relationship between microRNA-132 and fatty liver disease, were involved in data acquisition and interpretation and revised the paper. GAH was involved in protocol design, BP data acquisition, and interpretation and revised the paper. MTF was involved in data analysis and interpretation and revised the paper. NE and GWL are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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There is no competing interests for any of the authors. GL and MPS are investigators in recent studies sponsored by Medtronic. GL has acted as a consultant for Medtronic and has received honoraria or travel support for presentations from Pfizer, Wyeth Pharmaceuticals, Servier, and Medtronic. Professor Schlaich serves on scientific advisory boards for Abbott (formerly Solvay) Pharmaceuticals, BI, Novartis Pharmaceuticals, and Medtronic and has received honoraria and travel support from Abbott, BI, Servier, Novartis, and Medtronic. JBD is a board member of Nestlé Australia and has received payment for consultancy from Apollo Endosurgery, Bariatric Advantage, iNova Pharmaceuticals, and Novo Nordisk. Professor Head has had grant support from Boehringer Ingelheim.
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Eikelis, N., Dixon, J.B., Lambert, E.A. et al. MicroRNA-132 may be associated with blood pressure and liver steatosis—preliminary observations in obese individuals. J Hum Hypertens 36, 911–916 (2022). https://doi.org/10.1038/s41371-021-00597-2
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DOI: https://doi.org/10.1038/s41371-021-00597-2
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