Angiotensin II (Ang II) plays a detrimental role in aging and aging related diseases. Inhibitions of Ang II production and activities have shown various anti-aging effects. Ang II is produced from Ang I by angiotensin converting enzyme (ACE). Recent studies have revealed that ACE2, a homologue of ACE, can reduce Ang II production by converting Ang I into Ang 1-9 and converting Ang II into Ang 1-7. In addition to the heart, kidneys, vascular endothelial cells and smooth muscle cells, ACE2 also expresses in skeletal muscles. Our preliminary data showed that ACE2 protein level was significantly reduced in skeletal muscles in ageing mice, whereas transcutaneous electrical nerve stimulation (TENS) of sciatic nerve increased ACE2 expression in skeletal muscles. We hypothesize that stimulation of skeletal muscles increases ACE2 expression in skeletal muscles and reduce plasma Ang II level and increase Ang 1-7 in aged mice. To test this hypothesis, this study will first test whether TENS- increase muscle ACE2 expression is stimulation and contraction dependent in aged mice; Then we will determine whether TENS-enhanced ACE2 expression causes increased plasma Ang 1-7 and decreasd Ang II in aged mice. The results of this study will build a foundation for our future study to explore and develop novel anti-ageing approaches by enhancing endogenous anti-Ang II mechanisms, such as inducing ACE2 expression in skeletal muscles, with non-invasive, non- chemical means, such as TENS.

Public Health Relevance

Angiotensin II (Ang II) plays a detrimental role in aging and aging related diseases. ACE2 can reduce Ang II production by converting Ang I into Ang 1-9 and converting Ang II into Ang 1-7. Based on our preliminary data, this study will test whether skeletal muscles function as inducible source of ACE2 expression and whether stimulation of muscle can increase ACE2 expression and reduce Ang II level and activity in aged mice. The results of this study will support a new concept of inducible endogenous anti-Ang II mechanisms against aging. The results will also lay a foundation and provide approaches for further investigation of TENS as a non-invasive way to prevent and treat age related diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Small Research Grants (R03)
Project #
1R03AG051926-01A1
Application #
9181102
Study Section
Hypertension and Microcirculation Study Section (HM)
Program Officer
Williams, John
Project Start
2016-08-01
Project End
2018-03-31
Budget Start
2016-08-01
Budget End
2017-03-31
Support Year
1
Fiscal Year
2016
Total Cost
Indirect Cost
Name
University of South Dakota
Department
Other Basic Sciences
Type
Schools of Medicine
DUNS #
929930808
City
Vermillion
State
SD
Country
United States
Zip Code
57069
Liang, Ashley Paula; Drazick, Anthony Thomas; Gao, Hongbo et al. (2018) Skeletal muscle secretion of IL-6 is muscle type specific: Ex vivo evidence. Biochem Biophys Res Commun 505:146-150
Gao, Hongbo; Hartnett, Sigurd; Li, Yifan (2017) Ubiquitin C-Terminal Hydrolase L1 regulates myoblast proliferation and differentiation. Biochem Biophys Res Commun 492:96-102