鈣網(wǎng)蛋白基因缺陷細胞中MMP2和MMP9的表達及其調(diào)節(jié)機制
[Abstract]:Introduction: calmodulin (Calreticulin,crt) is an important regulatory protein that affects cardiac development in recent years. It was first isolated from cells by Ostwald in 1974 and is a major calcium-binding protein present in the endoplasmic reticulum of non-myocytes. The functions of calmodulin include: (1) molecular chaperone: to direct the folding of newly synthesized proteins; (2) to regulate cell adhesion; (3) to regulate the metabolism of calcium ions. Mice with calcium reticulum egg white gene knockout (crt-/-) can cause fetal mice to die in the womb. The direct cause of death was cardiac dysgenesis and umbilical hernia formation in mice. These changes are mainly due to changes in extracellular matrix protein content. Matrix metalloproteinases (matrix metalloproteinases,MMPs) are a group of zinc-dependent enzymes that can degrade extracellular matrix. It plays an important role in many cardiovascular diseases such as aneurysm, ventricular remodeling, heart injury and restenosis. MMP2 and MMP9 can induce proliferation and migration of endothelial cells and smooth muscle cells, which lead to angiogenesis. The changes of its activity may affect the formation of blood vessels and the development of heart. However, it is not clear whether the cause of cardiac hypoplasia in crt-/- mice is related to the alteration of MMP2 and MMP9 activity. In order to demonstrate the pathway of crt-/- affecting cardiac development from the aspects of mRNA protein activity, this work provides a new mechanism. Methods: embryonic fibroblasts (mouse) from wild-type (wt) and gene-deficient mice (crt-/-)
【學位授予單位】:汕頭大學
【學位級別】:博士
【學位授予年份】:2005
【分類號】:R363
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