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Obesity-induced lymphatic dysfunction is reversible with weight loss.

Matthew D Nitti1, Geoffrey E Hespe1, Raghu P Kataru1

  • 1The Department of Surgery, Division of Plastic and Reconstructive Surgery, Memorial Sloan Kettering Cancer Center (MSKCC), New York, NY, USA.

The Journal of Physiology
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Summary

Obesity impairs lymphatic function, causing leakiness and reduced transport. However, weight loss effectively reverses these detrimental effects, restoring lymphatic system health. This highlights the reversibility of obesity-induced lymphatic dysfunction.

Keywords:
lymphatic vessel functionobesityweight loss

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Area of Science:

  • Lymphatic Biology
  • Obesity Research
  • Immunology

Background:

  • Obesity is known to cause lymphatic dysfunction, but the permanence of these changes is unclear.
  • Studies suggest obesity negatively impacts lymphatic vessel density, pumping, and macromolecule transport.
  • Perilymphatic inflammation and inducible nitric oxide synthase (iNOS) expression are associated with obesity.

Purpose of the Study:

  • To investigate the cellular mechanisms behind obesity-induced lymphatic dysfunction.
  • To determine the correlation between weight gain and lymphatic system impairment.
  • To examine the reversibility of lymphatic dysfunction following weight loss.

Main Methods:

  • Utilized a mouse model of diet-induced obesity.
  • Assessed cutaneous lymphatic collecting vessel pumping rate and initial lymphatic vessel density.
  • Quantified perilymphatic inflammatory cell accumulation and iNOS expression.
  • Evaluated lymphatic leakiness and macromolecule clearance before and after a 8-week weight loss intervention.

Main Results:

  • Obesity showed a negative correlation with lymphatic collecting vessel pumping rate and vessel density.
  • Significant positive correlations were found between weight gain, perilymphatic inflammation, and iNOS expression.
  • Weight loss normalized lymphatic function, reduced leakiness, and improved macromolecule clearance.
  • Diet-induced weight loss significantly decreased perilymphatic inflammation and iNOS expression.

Conclusions:

  • Obesity is linearly correlated with lymphatic dysfunction, inflammation, and iNOS expression.
  • Weight loss through dietary modification effectively reverses obesity-induced lymphatic damage.
  • These findings underscore the potential for therapeutic interventions targeting weight loss to restore lymphatic health.