Dead adipocytes, detected as crown-like structures, are prevalent in visceral fat depots of genetically obese mice.
Level 5 - mechanism / opinion, no new human data
Non-clinical animal laboratory study.
PubMed 18390487 · doi:10.1194/jlr.M800019-JLR200
What was done
The authors quantified crown-like structures (CLS)—macrophages surrounding dead adipocytes—in visceral and subcutaneous adipose tissue depots from two strains of genetically obese mice (db/db and ob/ob).
What was found
CLS were more prevalent in visceral fat than subcutaneous fat in both db/db and ob/ob strains. Adipocyte size and CLS density were positively correlated in both depots. Despite visceral fat having smaller adipocyte sizes than subcutaneous fat, it had the highest CLS density. Visceral CLS density was 3.4-fold higher in db/db mice than in ob/ob mice. No specific sample sizes, baseline weights, or statistical confidence intervals were reported in the abstract.
Why it matters
The findings indicate that visceral adipocytes are distinctively susceptible to cell death and macrophage infiltration compared to subcutaneous adipocytes, offering a structural mechanism for the elevated metabolic risks associated with visceral adiposity.
Limits
This is an animal study in leptin-pathway deficient models (db/db and ob/ob), which may not fully represent human obesity. Exact animal numbers (n), age details, and statistical significance metrics were omitted from the abstract, and direct causal links to systemic insulin resistance were not dynamically tested.
Cited by
- contradicts Crown-like structures observed in fat biopsies under microscopy represent dead macrophages surrounding adipocytes.