1. Sarcoplasmic reticulum calcium ATPase (SERCA) proteolysis by matrix metalloproteinase-2 contributes to vascular dysfunction in early hypertension.
- Author
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Blascke de Mello MM, Neves VGO, Parente JM, Pernomian L, de Oliveira IS, Pedersoli CA, Awata WMC, Tirapelli CR, Arantes EC, Tostes RCA, Schulz R, and Castro MM
- Subjects
- Animals, Male, Rats, Aorta drug effects, Aorta physiopathology, Aorta pathology, Aorta metabolism, Doxycycline pharmacology, Rats, Sprague-Dawley, Vascular Remodeling drug effects, Blood Pressure drug effects, Hypertension physiopathology, Hypertension metabolism, Hypertension enzymology, Hypertension drug therapy, Matrix Metalloproteinase 2 metabolism, Proteolysis drug effects, Sarcoplasmic Reticulum Calcium-Transporting ATPases metabolism
- Abstract
Aims: Hypertension is associated with an increased activity of matrix metalloproteinase (MMP)-2 in the vasculature, which, in turn, proteolyzes extra- and intracellular proteins that lead to vascular dysfunction. The activity of sarcoplasmic reticulum calcium ATPase (SERCA) is decreased in the aortas of hypertensive rats. Increased activity of MMP-2 proteolyzed SERCA in rat heart during ischemia and reperfusion injury, thus impairing cardiac function. Therefore, we examined whether increased activity of MMP-2 in early hypertension contributes to proteolyze SERCA in the aortas, thus leading to maladaptive vascular remodeling and dysfunction., Main Methods: Male Sprague-Dawley rats were submitted to two kidney-one clip (2K-1C) or Sham surgery and treated with doxycycline. Systolic blood pressure (SBP) was assessed by tail-cuff plethysmography. After 7 days, aortas were collected for zymography assays, Western blot to SERCA, ATPase activity assay, vascular reactivity, Ki-67 immunofluorescence and hematoxylin/eosin stain., Key Findings: SBP was increased in 2K-1C rats and doxycycline did not reduce it, but decreased MMP-2 activity and prevented SERCA proteolysis in aortas. Cross sectional area, media to lumen ratio and Ki-67 were all increased in the aortas of hypertensive rats and doxycycline decreased Ki-67. In 2K-1C rats, arterial relaxation to acetylcholine was impaired and doxycycline ameliorated it., Significance: doxycycline reduced MMP-2 activity in aortas of 2K-1C rats and prevented proteolysis of SERCA and its dysfunction, thus ameliorating hypertension-induced vascular dysfunction., Competing Interests: Declaration of competing interest We declare that there are no conflicts of interest associated with this publication., (Copyright © 2024. Published by Elsevier B.V.)
- Published
- 2024
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