Impaired adrenergic agonist-dependent beige adipocyte induction in aged mice.
Level 5 - mechanism / opinion, no new human data
Animal research (rodent study)
PubMed 28026903 · doi:10.1002/oby.21727
What was done
Young (4 months) and aged (20 months) mice received daily injections of either saline or the β3-adrenergic receptor agonist CL316,243 (0.1 mg/kg/day) for 1 week. Researchers assessed UCP-1 protein expression in brown adipose tissue (BAT) and inguinal white adipose tissue (iWAT), as well as the abundance of platelet-derived growth factor receptor α-expressing progenitor cells in iWAT.
What was found
The abstract reports qualitative comparisons without exact numbers or statistical values. Body and WAT weights tended to be higher in aged mice. CL316,243 increased UCP-1 protein amounts in both BAT and iWAT; however, beige adipocyte induction was impaired in aged mice compared to young mice, whereas BAT activation was comparable between age groups. Inguinal WAT from aged mice had significantly fewer platelet-derived growth factor receptor α-expressing progenitor cells than that from young mice.
Why it matters
This study suggests that the age-related reduction in adipose thermogenic capacity is driven by a deficit in beige adipocyte recruitment and progenitor cell depletion rather than a loss of classical brown fat responsiveness.
Limits
The abstract provides no sample size (n) or numerical measurements. The study is restricted to mice exposed to a short 1-week pharmacological intervention, and animal adipose biology does not directly translate to human metabolic physiology.
Cited by
- supports In mice, the ability to generate new brown fat or convert white fat to beige fat declines with advancing age.