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Area of Science:

  • Gerontology
  • Molecular Biology
  • Pharmacology

Background:

  • Doxycycline (DOX) shows longevity effects in nematodes, but its impact on mammalian aging is not well understood.
  • Hutchinson-Gilford progeria syndrome (HGPS) is a rare, fatal genetic disorder characterized by premature aging.
  • Zmpste24 knockout (KO) mice serve as a model for HGPS, exhibiting accelerated aging phenotypes.

Purpose of the Study:

  • To investigate the antiaging effects of doxycycline (DOX) in a mouse model of Hutchinson-Gilford progeria syndrome (HGPS).
  • To elucidate the molecular mechanisms underlying DOX's potential antiaging properties in mammals.

Main Methods:

  • Utilized Zmpste24 knockout (KO) mice, a model for HGPS, to assess doxycycline treatment.
  • Analyzed lifespan, progeroid features (body/tissue weight, exercise capacity, bone density, colon length), nuclear envelope abnormalities, cellular senescence, and cell death.
  • Measured serum and tissue levels of IL6 and assessed α-tubulin (K40) acetylation mediated by NAT10.

Main Results:

  • Doxycycline treatment significantly prolonged lifespan and ameliorated key aging features in Zmpste24 KO mice.
  • DOX alleviated abnormal nuclear envelopes, reduced cellular senescence and cell death in KO mice and HGPS fibroblasts.
  • Doxycycline downregulated pro-inflammatory IL6 and reversed elevated NAT10-mediated α-tubulin acetylation in affected tissues.

Conclusions:

  • Doxycycline demonstrates significant antiaging effects in a mouse model of progeria.
  • DOX counteracts aging by reducing IL6 expression and normalizing NAT10-mediated α-tubulin acetylation.
  • This study highlights doxycycline as a potential therapeutic agent for decelerating aging processes in progeria.