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TRPC5 channel modulates endothelial cells senescence.

Zhengtao Li1, Gang Guo2, Hongrui Wang1

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|February 27, 2017
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Canonical transient receptor potential 5 channel (TRPC5) deficiency improves vascular aging. TRPC5 knockout in aged mice enhances endothelial function and reduces senescence markers.

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Area of Science:

  • Cardiovascular Biology
  • Cellular Aging
  • Ion Channel Physiology

Background:

  • Canonical transient receptor potential 5 (TRPC5) is a Ca2+-permeable channel implicated in diverse cellular functions.
  • TRPC5 is highly expressed in vascular endothelium, but its role in endothelial senescence remains unclear.

Purpose of the Study:

  • To investigate the role of TRPC5 in mouse aortic endothelial cell (MAEC) senescence.
  • To examine the regulatory function of TRPC5 in endothelial dysfunction associated with aging in mice.

Main Methods:

  • Gene knockout of TRPC5 in aged mice and MAECs.
  • Assessment of endothelium-dependent relaxations and contractions in aortic rings.
  • Measurement of nuclear telomerase activity, nitric oxide (NO) generation, and reactive oxygen species (ROS) production.
  • Senescence-associated β-galactosidase staining.
  • Analysis of protein expression levels (eNOS, SIRT1, P53, P21).

Main Results:

  • TRPC5 knockout improved endothelium-dependent relaxations and attenuated contractions in aged mouse aortas.
  • Aged mice and senescent MAECs lacking TRPC5 exhibited enhanced nuclear telomerase activity and NO generation, with inhibited ROS production.
  • TRPC5 deficiency markedly reduced oxidative stress-induced premature senescence in MAECs.
  • Expressions of eNOS and SIRT1 were upregulated, while P53 and P21 were downregulated in aged or H2O2-treated MAECs without TRPC5.

Conclusions:

  • TRPC5 plays a significant role in regulating vascular aging.
  • Targeting TRPC5 may offer a novel therapeutic strategy for mitigating age-related vascular dysfunction and endothelial senescence.