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Regression of pressure overload-induced left ventricular hypertrophy in mice.
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- Author(s): Xiao-Ming Gao; Kiriazis, Helen; Xiao-Lei Moore; Xin-Heng Feng; Sheppard, Karen; Dart, Anthony; Xiao-Jun Du
- Source:
American Journal of Physiology: Heart & Circulatory Physiology; Jun2005, Vol. 288 Issue 6, pH2702-H2707, 6p, 1 Chart, 4 Graphs- Subject Terms:
- Source:
- Additional Information
- Abstract: As a prelude to investigating the mechanism of regression of pressure overload-induced left ventricular (LV) hypertrophy (LVH), we studied the time course for the development and subsequent regression of LVH as well as accompanying alterations in cardiac function, histology, and gene expression. Mice were subjected to aortic banding for 4 or 8 wk to establish LVH, and regression was initiated by release of aortic banding for 6 wk. Progressive increase in LV mass and gradual chamber dilatation and dysfunction occurred after aortic banding. LVH was also associated with myocyte enlargement, interstitial fibrosis, and enhanced expression of atrial natriuretic peptide, collagen I, collagen III, and matrix metalloproteinase-2 but suppressed expression of α-myosin heavy chain and sarcoplasmic reticulum Ca2+-ATPase. Aortic debanding completely or partially reversed LVH, chamber dilatation and dysfunction, myocyte size, interstitial fibrosis, and gene expression pattern, each with a distinct time course. The extent of LVH regression was dependent on the duration of pressure overload, evidenced by the fact that restoration of LV structure and function was complete in animals subjected to 4 wk of aortic banding but incomplete in animals subjected to 8 wk of aortic banding. In conclusion, LVH regression comprises a variety of morphological, functional, and genetic components that show distinct time courses. A longer period of pressure overload is associated with a slower rate of LVH regression. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of American Journal of Physiology: Heart & Circulatory Physiology is the property of American Physiological Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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