Elastic Fibers Density: a New Parameter of Improvement of NAFLD in Bariatric Surgery Patients

Abstract

Purpose

Obesity is a major risk factor for nonalcoholic fatty liver disease (NAFLD), affecting 25% of the worldwide population. Weight loss through bariatric surgery can improve much of the liver steatosis, inflammation, and fibrosis. However, it is not known whether there is reversal of the elastic fiber deposition process, triggered by hepatic damage and related to worse prognosis.

Materials and Methods

Individuals submitted to bariatric surgery at our institution, from March 2016 to June 2017, with intraoperative liver biopsy confirming NAFLD were approached. Those who consented were submitted to a second liver biopsy 1 year later and were included. Specimens were sliced and stained with hematoxylin-eosin and Sirius red for histological assessment according to Brunt’s criteria and with orcein for digital analysis morphometrics using ImageJ®. Quantification of elastic fibers was accomplished by corrected integrated density.

Results

Thirty-seven patients were included. Body mass index, metabolic markers, NAFLD activity score, and fibrosis improved 1 year after the procedure. The elastic fiber density showed a significant decrease: 239.3 × 103 absorbance micrometer2 (141.08–645.32) to 74.62 × 103 absorbance micrometer2 (57.42–145.17), p = 0.007.

Conclusion

Liver elastic fiber density decreases with the reversal of NAFLD through weight loss.

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Correspondence to Carine Leite.

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The authors declare that they have no conflict of interest.

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Informed consent was obtained from all individual participants included in the study.

Human and Animal Rights/Ethical Approval

The study was approved by the HCPA Ethical Committee numbers 1.887.117 and 3.227.637. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Leite, C., Starosta, R.T., Trindade, E.N. et al. Elastic Fibers Density: a New Parameter of Improvement of NAFLD in Bariatric Surgery Patients. OBES SURG 30, 3839–3846 (2020). https://doi.org/10.1007/s11695-020-04722-x

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Keywords

  • Obesity
  • Nonalcoholic fatty liver disease
  • Elastic fibers