Dexamethasone-Induced Arterial Stiffening Is Attenuated by Training due to a Better Balance Between Aortic Collagen and Elastin Levels

Paula, Vinícius F De; Tardelli, Lidieli P.; Amaral, Sandra Lia do

doi:10.1007/s10557-023-07438-z

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“…In addition, both fibrillar collagens have similar physiological functions, but COL1 is stiffer and provides structural rigidity over COL 3, which is thinner. In this sense, recently, Witting and Szulcek [58] have proposed that the normal physiologic range of the aortic COL1/COL3 ratio is around 2.04 to 3.83, which is in agreement with a recent study from our group [59] and that COL1 increases to collagen-III in all non-physiologic cases, including hypertension and atherosclerosis.…”

Section: Discussionsupporting

confidence: 84%

Physical Training vs. Perindopril Treatment on Arterial Stiffening of Spontaneously Hypertensive Rats: A Proteomic Analysis and Possible Mechanisms

et al. 2023

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(1) Background: Arterial stiffness is an important predictor of cardiovascular events. Perindopril and physical exercise are important in controlling hypertension and arterial stiffness, but the mechanisms are unclear. (2) Methods: Thirty-two spontaneously hypertensive rats (SHR) were evaluated for eight weeks: SHRC (sedentary); SHRP (sedentary treated with perindopril—3 mg/kg) and SHRT (trained). Pulse wave velocity (PWV) analysis was performed, and the aorta was collected for proteomic analysis. (3) Results: Both treatments determined a similar reduction in PWV (−33% for SHRP and −23% for SHRT) vs. SHRC, as well as in BP. Among the altered proteins, the proteomic analysis identified an upregulation of the EH domain-containing 2 (EHD2) protein in the SHRP group, required for nitric oxide-dependent vessel relaxation. The SHRT group showed downregulation of collagen-1 (COL1). Accordingly, SHRP showed an increase (+69%) in the e-NOS protein level and SHRT showed a lower COL1 protein level (−46%) compared with SHRC. (4) Conclusions: Both perindopril and aerobic training reduced arterial stiffness in SHR; however, the results suggest that the mechanisms can be distinct. While treatment with perindopril increased EHD2, a protein involved in vessel relaxation, aerobic training decreased COL1 protein level, an important protein of the extracellular matrix (ECM) that normally enhances vessel rigidity.

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Section: Discussionsupporting

confidence: 84%