Angiogenesis in the corpus luteum

被引:245
作者
Reynolds, LP [1 ]
Grazul-Bilska, AT
Redmer, DA
机构
[1] N Dakota State Univ, Inst Biotechnol, Dept Anim & Range Sci, Fargo, ND 58105 USA
[2] N Dakota State Univ, Inst Biotechnol, Ctr Cell Biol, Fargo, ND 58105 USA
关键词
corpus luteum; angiogenesis; vascular endothelial growth factor (VEGF); nitric oxide (NO); pericytes;
D O I
10.1385/ENDO:12:1:1
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The ovarian corpus luteum plays a critical role in reproduction because it is the primary source of circulating progesterone. After ovulation, as the corpus luteum forms from the wall of the ruptured follicle, it grows and vascularizes extremely rapidly. In fact, the rates of tissue growth and angiogenesis in the corpus luteum rival those of even the fastest growl ng tumors. Thus, the corpus luteum provides an outstanding model for studying the factors that regulate the angiogenic process, which is critical for normal tissue growth, development, and function. In agreement with data from other tissues, vascular endothelial growth factors (VEGF) seem to be a major angiogenic factor responsible for vascularization of the developing corpus luteum. Recent data suggest that luteal expression of VEGF occurs primarily in specific perivascular cells, including arteriolar smooth muscle and capillary pericytes, and is regulated primarily by oxygen levels. In addition, soon after ovulation, pericytes derived from the thecal compartment appear to be the first vascular cells to invade the developing luteal parenchyma. The granulosa-derived cells produce a factor that stimulates pericyte migration. Moreover, nitric oxide (NO), which is a potent vasodilator and can stimulate VEGF production and angiogenesis, is expressed in endothelial cells of luteal arterioles and capillaries, often in association with expression of VEGF by luteal perivascular cells. Thus, we have proposed a model for the initial process of luteal vascularization in which hypoxia plays a major role. In this model, which we believe will apply to other tissues as well, a paracrine loop exists between the vascular endothelial cells, which produce NO, and the peri-endothelial cells (vascular smooth muscle and pericytes), which produce VEGF, to ensure coordinate regulation of luteal vasodilation and angiogenesis.
引用
收藏
页码:1 / 9
页数:9
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