Increase of free insulin-like growth factor-1 in normal human breast in vivo late in the menstrual cycle

被引:42
作者
Dabrosin, C [1 ]
机构
[1] Linkoping Univ Hosp, Div Gynecol Oncol, Fac Hlth Sci, S-58185 Linkoping, Sweden
关键词
ELISA; estradiol; mammary gland; microdialysis; progesterone;
D O I
10.1023/A:1024575103524
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Prolonged exposure to endogenous and exogenous sex steroids increases the risk of breast cancer but the mechanisms are poorly understood. Increased levels of circulating insulin-like growth factor-1 (IGF-1) and low levels of IGF binding protein are associated with increased risk of breast cancer suggesting that IGF-1 has to be in its free form to be biologically active. Little is known about sex steroid regulation of IGF-1 locally in the breast. In this study microdialysis was used to determine the local levels of free IGF-1 in normal human breast tissue in healthy female volunteers during the menstrual cycle. The results showed that the extracellular levels of free IGF-1 locally in the breast were doubled in the luteal phase, when estradiol and progesterone levels were elevated, compared with the follicular phase. In plasma, free IGF-1 levels also exhibited a cyclic variation but to a less extent. The increased local levels of the free form of IGF-1 may promote proliferation in the breast epithelium. This could be important in sex steroid dependent breast cancer development.
引用
收藏
页码:193 / 198
页数:6
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