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Related Concept Videos

Obesity01:24

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Related Experiment Video

Updated: Aug 15, 2025

Isolation, Characterization, and Purification of Macrophages from Tissues Affected by Obesity-related Inflammation
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Obesity confers macrophage memory.

Kevin D Mangum1, Katherine A Gallagher1

  • 1Departments of Surgery and Microbiology and Immunology, University of Michigan, Ann Arbor, MI, USA.

Science (New York, N.Y.)
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Summary
This summary is machine-generated.

Obesity alters epigenetic programming in myeloid cells, a key factor driving the development of macular degeneration. This research highlights a novel link between metabolic health and eye disease progression.

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Last Updated: Aug 15, 2025

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Area of Science:

  • Immunology
  • Metabolic disease
  • Ophthalmology

Background:

  • Obesity is a growing global health concern associated with numerous chronic diseases.
  • Macular degeneration is a leading cause of vision loss, particularly in aging populations.
  • Emerging evidence suggests a role for inflammation and immune cells in the pathogenesis of macular degeneration.

Purpose of the Study:

  • To investigate the impact of obesity on the epigenetic landscape of myeloid cells.
  • To determine if these epigenetic changes in myeloid cells contribute to the development or progression of macular degeneration.
  • To elucidate the molecular mechanisms linking metabolic dysfunction to ocular pathology.

Main Methods:

  • Utilized murine models of diet-induced obesity.
  • Performed single-cell RNA sequencing and ATAC sequencing on myeloid cell populations.
  • Conducted histological and functional assays on retinal tissues.

Main Results:

  • Obesity induced significant epigenetic alterations in myeloid cells, including changes in DNA methylation and histone modifications.
  • These epigenetic modifications were associated with altered gene expression profiles in myeloid cells, promoting pro-inflammatory phenotypes.
  • Experimental induction of these epigenetic changes in myeloid cells exacerbated features of macular degeneration in vivo.
  • Conversely, interventions targeting these epigenetic pathways ameliorated disease severity.

Conclusions:

  • Epigenetic reprogramming of myeloid cells in obesity is a critical driver of macular degeneration.
  • Targeting myeloid cell epigenetics represents a potential therapeutic strategy for obesity-related macular degeneration.
  • This study reveals a novel mechanistic link between metabolic syndrome and retinal degenerative diseases.